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The equation of a wave disturbance is given as :
where X and y are in metres and f in seconds. Choose the wrong statement:- a)Node occurs at x = 0.15 m
- b)The wavelength is 0.2 m
- c)Antinode occurs at x = 0.3 m
- d)The speed of the constituent waves is 5 m/s
Correct answer is option 'D'. Can you explain this answer?
The equation of a wave disturbance is given as :
where X and y are in metres and f in seconds. Choose the wrong statement:
where X and y are in metres and f in seconds. Choose the wrong statement:a)
Node occurs at x = 0.15 m
b)
The wavelength is 0.2 m
c)
Antinode occurs at x = 0.3 m
d)
The speed of the constituent waves is 5 m/s
|
Ameya Rane answered |
The correct answer is: The speed of the constituent waves is 5 m/s
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When a body falls from an aeroplane, there is increase in its –
- a)Acceleration
- b)Mass
- c)Kinetic energy
- d)Potential energy
Correct answer is option 'C'. Can you explain this answer?
When a body falls from an aeroplane, there is increase in its –
a)
Acceleration
b)
Mass
c)
Kinetic energy
d)
Potential energy
|
Aryan Khanna answered |
- The energy possessed by a body by its motion is called kinetic energy.
- K.E = ½ × mv2 where, m = mass, v = velocity, K.E = kinetic energy.
- Potential Energy is possessed by its position or configuration.
- When a body falls from an aeroplane its velocity increases, so it's kinetic energy increases (K.E = ½ × mv2).
Correct option is C. Kinetic Energy
Consider the following statements about a computer named “ Greenware” .
1. ‘Greenware’ is completely free of both hazardous PVC (Polyvinylchloride) and BFR (brominated flame-retardants).
2. Manufacturing of ‘Greenware’ can be a special action like replacing all standard light bulbs with CFLs or a more general application to live more ecologically.Q. Which of the statements given above is/are correct?- a)1 only
- b)2 only
- c)Both 1 and 2
- d)Neither 1 nor 2
Correct answer is option 'C'. Can you explain this answer?
Consider the following statements about a computer named “ Greenware” .
1. ‘Greenware’ is completely free of both hazardous PVC (Polyvinylchloride) and BFR (brominated flame-retardants).
2. Manufacturing of ‘Greenware’ can be a special action like replacing all standard light bulbs with CFLs or a more general application to live more ecologically.
1. ‘Greenware’ is completely free of both hazardous PVC (Polyvinylchloride) and BFR (brominated flame-retardants).
2. Manufacturing of ‘Greenware’ can be a special action like replacing all standard light bulbs with CFLs or a more general application to live more ecologically.
Q. Which of the statements given above is/are correct?
a)
1 only
b)
2 only
c)
Both 1 and 2
d)
Neither 1 nor 2
|
|
Sounak Basu answered |
‘Greenware’ is completely free of both hazardous PVC and BFR and its manufacturing can be a special action like replacing all standard light bulbs with CFLs or a more general application to live more ecologically.
What is a keyboard used in a computer for?- a)To input text and numbers and send commands to the computer.
- b)To create new keys to use with your computer.
- c)To open the computer up.
- d)To create pictures and images and send them to your computer.
Correct answer is option 'A'. Can you explain this answer?
What is a keyboard used in a computer for?
a)
To input text and numbers and send commands to the computer.
b)
To create new keys to use with your computer.
c)
To open the computer up.
d)
To create pictures and images and send them to your computer.
|
|
Saptarshi Malik answered |
A computer keyboard, a typewriter–style device having a particular arrangement of buttons or keys, is a main input device. It inputs text, numbers and sends commands to the computer.
A computer cookie is a small text file placed on computers by a website. Which among the following can be the use of cookie?
1. Cookies can carry viruses.
2. Cookies can be used to maintain data.
3. Cookies can be used to track internet user’s web browsing.
4. Cookies can install malware on the host computer. - a)1 and 2 only
- b)2 and 3 only
- c)3 and 4 only
- d)All the above
Correct answer is option 'B'. Can you explain this answer?
A computer cookie is a small text file placed on computers by a website. Which among the following can be the use of cookie?
1. Cookies can carry viruses.
2. Cookies can be used to maintain data.
3. Cookies can be used to track internet user’s web browsing.
4. Cookies can install malware on the host computer.
1. Cookies can carry viruses.
2. Cookies can be used to maintain data.
3. Cookies can be used to track internet user’s web browsing.
4. Cookies can install malware on the host computer.
a)
1 and 2 only
b)
2 and 3 only
c)
3 and 4 only
d)
All the above
|
Mayank Joshi answered |
Activity.
4. Cookies can personalize website content.
5. Cookies can store login information.
6. Cookies can improve website performance.
The correct options are 2, 3, 4, 5, and 6. Cookies are not capable of carrying viruses.
4. Cookies can personalize website content.
5. Cookies can store login information.
6. Cookies can improve website performance.
The correct options are 2, 3, 4, 5, and 6. Cookies are not capable of carrying viruses.
The frequency changes by 10% as the source approaches a stationary observer with constant speed vs. What would be the percentage change in frequency as the source recedes the observer with the same speed ? Given, that vs « v ( v = speed of sound in air)- a)16.7%
- b)8.5%
- c)14.3%
- d)20%
Correct answer is option 'B'. Can you explain this answer?
The frequency changes by 10% as the source approaches a stationary observer with constant speed vs. What would be the percentage change in frequency as the source recedes the observer with the same speed ? Given, that vs « v ( v = speed of sound in air)
a)
16.7%
b)
8.5%
c)
14.3%
d)
20%
|
Pie Academy answered |
A team of scientists at NASA with the European Space Agency are working to probe dark energy or the existence of dark matter. Consider the following statements in this regard.
1. Dark matter is called so because it does not interact with light.
2. Dark matter interacts with ordinary matter through gravity and binds galaxies together like an invisible glue.
3. While dark matter pulls matter together, dark energy pushes the universe apart at ever increasing speed. 4. Dark matters are potentially effective in many dignostic devices such as PET scanners.Q. Which of the statements given above are correct?- a)1, 2 and 3 only
- b)2, 3 and 4 only
- c)1, 3 and 4 only
- d)1, 2, 3 and 4.
Correct answer is option 'A'. Can you explain this answer?
A team of scientists at NASA with the European Space Agency are working to probe dark energy or the existence of dark matter. Consider the following statements in this regard.
1. Dark matter is called so because it does not interact with light.
2. Dark matter interacts with ordinary matter through gravity and binds galaxies together like an invisible glue.
3. While dark matter pulls matter together, dark energy pushes the universe apart at ever increasing speed. 4. Dark matters are potentially effective in many dignostic devices such as PET scanners.
1. Dark matter is called so because it does not interact with light.
2. Dark matter interacts with ordinary matter through gravity and binds galaxies together like an invisible glue.
3. While dark matter pulls matter together, dark energy pushes the universe apart at ever increasing speed. 4. Dark matters are potentially effective in many dignostic devices such as PET scanners.
Q. Which of the statements given above are correct?
a)
1, 2 and 3 only
b)
2, 3 and 4 only
c)
1, 3 and 4 only
d)
1, 2, 3 and 4.
|
|
Saptarshi Malik answered |
Dark matter is a type of matter hypothesized in astronomy and cosmilogy to account for a large part of the mass that appears missing from the universe, it does not interact with light. It is also hypothesized that it interacts with ordinary matter through gravity and binds galaxies, and it pushes the universe apart.
Consider the following statements:
Assertion (A): Space Based Solar Power (SBSP) is considered to be made a national goal.
Reason (R): Supply of SBSP is 99% uninterrupted throughout the year, besides the enormity of energy availability.
Q. Select the correct answers from the codes given below:- a)Both A and R are true and R is the correct explanation of A.
- b)Both A and R are true, but R is not the correct explanation of A.
- c)A is true, but R is false.
- d)A is false, but R is true.
Correct answer is option 'A'. Can you explain this answer?
Consider the following statements:
Assertion (A): Space Based Solar Power (SBSP) is considered to be made a national goal.
Reason (R): Supply of SBSP is 99% uninterrupted throughout the year, besides the enormity of energy availability.
Q. Select the correct answers from the codes given below:
Assertion (A): Space Based Solar Power (SBSP) is considered to be made a national goal.
Reason (R): Supply of SBSP is 99% uninterrupted throughout the year, besides the enormity of energy availability.
Q. Select the correct answers from the codes given below:
a)
Both A and R are true and R is the correct explanation of A.
b)
Both A and R are true, but R is not the correct explanation of A.
c)
A is true, but R is false.
d)
A is false, but R is true.
|
Ipsita Bajaj answered |
Space based solar power (SBSP) is considered to be made a national goal, because its supply is 99% uninterrupted throughout the year, besides the enormity of energy availability.
The method of protecting iron from rusting, by coating a thin layer of Zinc is called -- a)Galvanizing
- b)rancidity
- c)Alloy
- d)Pulverizing
Correct answer is option 'A'. Can you explain this answer?
The method of protecting iron from rusting, by coating a thin layer of Zinc is called -
a)
Galvanizing
b)
rancidity
c)
Alloy
d)
Pulverizing
|
Ishani khanna answered |
Galvanizing: Protecting Iron from Rusting
Galvanizing is the method of protecting iron from rusting by coating it with a thin layer of zinc. It is a widely used technique to prevent corrosion and extend the lifespan of iron and steel objects. Let's delve into the details of galvanizing and why it is an effective method of protection.
1. What is Galvanizing?
Galvanizing is a process in which a layer of zinc is applied to the surface of iron or steel to create a protective barrier. The zinc coating acts as a sacrificial anode, meaning it corrodes instead of the iron or steel beneath it. This sacrificial action ensures that the iron or steel remains protected from rusting.
2. How is Galvanizing done?
The galvanizing process involves several steps:
2.1 Surface Preparation:
The surface of the iron or steel object is cleaned to remove any dirt, grease, or oxide layers. This step is crucial as it ensures proper adhesion of the zinc coating.
2.2 Immersion in a Zinc Bath:
The cleaned iron or steel object is immersed in a bath of molten zinc at a temperature of around 450°C. The object is carefully dipped into the bath, allowing the zinc to adhere to its surface.
2.3 Metallurgical Reaction:
During immersion, a metallurgical reaction occurs between the iron or steel and the molten zinc. This reaction forms a series of zinc-iron alloy layers on the surface of the object.
2.4 Cooling and Finishing:
After the object is removed from the zinc bath, it is allowed to cool, allowing the zinc coating to solidify and adhere firmly to the iron or steel surface. The galvanized object is then typically inspected for any defects or imperfections.
3. Advantages of Galvanizing:
Galvanizing offers several advantages as a method of protecting iron from rusting:
3.1 Corrosion Resistance:
The zinc coating provides excellent corrosion resistance to the iron or steel object, preventing rust formation even in harsh environments.
3.2 Longevity:
Galvanized objects have a longer lifespan compared to bare iron or steel. The zinc coating acts as a durable protective layer, extending the life of the object.
3.3 Cost-Effective:
Galvanizing is a cost-effective method of protection as it requires minimal maintenance. The initial investment in galvanizing pays off in terms of reduced repair and replacement costs.
3.4 Aesthetic Appeal:
Galvanized objects have a visually appealing silver-gray finish that is often desirable in architectural and decorative applications.
4. Applications of Galvanizing:
Galvanizing is widely used in various industries and applications, including:
- Construction: Galvanized steel is used in roofing, fencing, structural components, and other construction applications.
- Automotive: Galvanized parts are used in automobile manufacturing to enhance corrosion resistance.
- Agriculture: Galvanized equipment and structures are commonly used in farming and agricultural settings.
- Electrical: Galvanized electrical conduits and cable trays provide protection against corrosion.
In conclusion, galvanizing is a highly effective method of protecting iron from rusting by coating it with a thin layer of zinc. This process creates a barrier that prevents the iron
Galvanizing is the method of protecting iron from rusting by coating it with a thin layer of zinc. It is a widely used technique to prevent corrosion and extend the lifespan of iron and steel objects. Let's delve into the details of galvanizing and why it is an effective method of protection.
1. What is Galvanizing?
Galvanizing is a process in which a layer of zinc is applied to the surface of iron or steel to create a protective barrier. The zinc coating acts as a sacrificial anode, meaning it corrodes instead of the iron or steel beneath it. This sacrificial action ensures that the iron or steel remains protected from rusting.
2. How is Galvanizing done?
The galvanizing process involves several steps:
2.1 Surface Preparation:
The surface of the iron or steel object is cleaned to remove any dirt, grease, or oxide layers. This step is crucial as it ensures proper adhesion of the zinc coating.
2.2 Immersion in a Zinc Bath:
The cleaned iron or steel object is immersed in a bath of molten zinc at a temperature of around 450°C. The object is carefully dipped into the bath, allowing the zinc to adhere to its surface.
2.3 Metallurgical Reaction:
During immersion, a metallurgical reaction occurs between the iron or steel and the molten zinc. This reaction forms a series of zinc-iron alloy layers on the surface of the object.
2.4 Cooling and Finishing:
After the object is removed from the zinc bath, it is allowed to cool, allowing the zinc coating to solidify and adhere firmly to the iron or steel surface. The galvanized object is then typically inspected for any defects or imperfections.
3. Advantages of Galvanizing:
Galvanizing offers several advantages as a method of protecting iron from rusting:
3.1 Corrosion Resistance:
The zinc coating provides excellent corrosion resistance to the iron or steel object, preventing rust formation even in harsh environments.
3.2 Longevity:
Galvanized objects have a longer lifespan compared to bare iron or steel. The zinc coating acts as a durable protective layer, extending the life of the object.
3.3 Cost-Effective:
Galvanizing is a cost-effective method of protection as it requires minimal maintenance. The initial investment in galvanizing pays off in terms of reduced repair and replacement costs.
3.4 Aesthetic Appeal:
Galvanized objects have a visually appealing silver-gray finish that is often desirable in architectural and decorative applications.
4. Applications of Galvanizing:
Galvanizing is widely used in various industries and applications, including:
- Construction: Galvanized steel is used in roofing, fencing, structural components, and other construction applications.
- Automotive: Galvanized parts are used in automobile manufacturing to enhance corrosion resistance.
- Agriculture: Galvanized equipment and structures are commonly used in farming and agricultural settings.
- Electrical: Galvanized electrical conduits and cable trays provide protection against corrosion.
In conclusion, galvanizing is a highly effective method of protecting iron from rusting by coating it with a thin layer of zinc. This process creates a barrier that prevents the iron
Recently, India successfully test-fired ‘Nirbhay’. Consider the following statements in the above context:
1. Nirbhay is the country’s second supersonic cruise missile, the first being Brahmos.
2. It is a 3-stage surface-to-air missile and is inspired by the technology of ‘Lakshyaaircraft’.
3. It is also called ‘treetop missile’ as its shape is similar to the stem of a tree.
4. The missile has a good loitering capability.
5. The missile is designed by the Aeronautical Development Establishment (ADE) of DRDO.Q. Which of the statements given above is/are correct?- a)2 and 4 only
- b)4 and 5 only
- c)2, 3, 4 and 5 only
Correct answer is option ''. Can you explain this answer?
Recently, India successfully test-fired ‘Nirbhay’. Consider the following statements in the above context:
1. Nirbhay is the country’s second supersonic cruise missile, the first being Brahmos.
2. It is a 3-stage surface-to-air missile and is inspired by the technology of ‘Lakshyaaircraft’.
3. It is also called ‘treetop missile’ as its shape is similar to the stem of a tree.
4. The missile has a good loitering capability.
5. The missile is designed by the Aeronautical Development Establishment (ADE) of DRDO.
1. Nirbhay is the country’s second supersonic cruise missile, the first being Brahmos.
2. It is a 3-stage surface-to-air missile and is inspired by the technology of ‘Lakshyaaircraft’.
3. It is also called ‘treetop missile’ as its shape is similar to the stem of a tree.
4. The missile has a good loitering capability.
5. The missile is designed by the Aeronautical Development Establishment (ADE) of DRDO.
Q. Which of the statements given above is/are correct?
a)
2 and 4 only
b)
4 and 5 only
c)
2, 3, 4 and 5 only
|
|
Dhruba Chavan answered |
Nirbhay is a long range, subsonic cruise missile being developed in India by Defence Research and Development Organisation. The missile has a good loitering capability i.e., it can go round a target and perform several manoeuvres and then re-engage it. Its first trial on 12 March 2013 from Chandipur, Odisha was failed. Brahmos is a supersonic cruise missile, while ‘Lakshya’ is an Indian pilot-less target drone system. Nirbhy’s technology is not inspired by it. It is a “tree–top” missile because it can flyover or around hills, can fly at a very low altitude and avoid detection.
What is the difference between present Wi – Fi technology and super Wi – Fi?
1. Present Wi – Fi technology supports 802.11 b/g/n standard while new super Wi – Fi will support 802.11 ad standard.
2. Super Wi – Fi can send data upto the length of 1 – 2 GB and eventually there would be no log in the speed.
3. The new super Wi – Fi would function at the speed of 7 gigabytes per second, much more than the speed of ordinary Wi – Fi.
Q. Select the correct answer using the codes given below:- a)1 and 2 only
- b)2 and 3 only
- c)1 and 3 only
- d)1, 2 and 3
Correct answer is option 'D'. Can you explain this answer?
What is the difference between present Wi – Fi technology and super Wi – Fi?
1. Present Wi – Fi technology supports 802.11 b/g/n standard while new super Wi – Fi will support 802.11 ad standard.
2. Super Wi – Fi can send data upto the length of 1 – 2 GB and eventually there would be no log in the speed.
3. The new super Wi – Fi would function at the speed of 7 gigabytes per second, much more than the speed of ordinary Wi – Fi.
Q. Select the correct answer using the codes given below:
1. Present Wi – Fi technology supports 802.11 b/g/n standard while new super Wi – Fi will support 802.11 ad standard.
2. Super Wi – Fi can send data upto the length of 1 – 2 GB and eventually there would be no log in the speed.
3. The new super Wi – Fi would function at the speed of 7 gigabytes per second, much more than the speed of ordinary Wi – Fi.
Q. Select the correct answer using the codes given below:
a)
1 and 2 only
b)
2 and 3 only
c)
1 and 3 only
d)
1, 2 and 3
|
|
Milan Jain answered |
New Super Wi-Fi will support 802.11 ad standard, it can send data upto the length of 1-2 GB and would function at the speed of 7 gigabits per second.
Which among the following is not a characteristic of transition metals? - a)Tendency to gain electrons
- b)Low electro negativity
- c)Low ionization energy
- d)Malleability
Correct answer is option 'A'. Can you explain this answer?
Which among the following is not a characteristic of transition metals?
a)
Tendency to gain electrons
b)
Low electro negativity
c)
Low ionization energy
d)
Malleability
|
Eshaan Kapoor answered |
The transition metals have a tendency to lose electrons. Since the electrons in the highest energy level are actually on a lower principal energy number than the ones before them, this makes it relatively easy to lose some or all of their electrons to land in stable state.
The surface tension of water on adding detergent to it –- a)increases
- b)decreases
- c)no change
- d)becomes zero
Correct answer is option 'B'. Can you explain this answer?
The surface tension of water on adding detergent to it –
a)
increases
b)
decreases
c)
no change
d)
becomes zero
|
|
Eshaan Kapoor answered |
In the solid and liquid phase, water molecules are bonded to each other by virtue of an interaction between hydrogen atoms on one molecule and the oxygen atom of another — the process is referred to as "hydrogen bonding." The result is a kind of "skin" on liquid water's surface.
Coolis tube is used to produce –- a)Radio waves
- b)Micro waves
- c)X-rays
- d)Gama rays
Correct answer is option 'C'. Can you explain this answer?
Coolis tube is used to produce –
a)
Radio waves
b)
Micro waves
c)
X-rays
d)
Gama rays
|
Rimjhim menon answered |
Coolis Tube and X-rays Production
The Coolis tube is a type of X-ray tube that is used to produce X-rays for various applications in the medical field, industrial testing, and other areas. It operates by generating high-energy electrons that are accelerated and then directed towards a target material, typically made of tungsten.
Working Principle
- When the high-energy electrons hit the target material, they interact with the atoms in the target, causing them to release X-ray photons.
- These X-ray photons have high energy and are capable of penetrating through tissues and materials, making them useful for diagnostic imaging and other purposes.
Uses of X-rays
- X-rays are commonly used in medical imaging to visualize the internal structures of the body, such as bones, tissues, and organs.
- They are also used in industrial applications for inspecting the integrity of welds, detecting cracks in metal components, and other quality control processes.
Comparison with other wave types
- X-rays are different from radio waves, microwaves, and gamma rays in terms of their energy level and applications.
- While radio waves and microwaves have lower energy and are used for communication and heating purposes, gamma rays have higher energy and are typically used in medical treatments and sterilization processes.
In conclusion, the Coolis tube is specifically designed to produce X-rays, which have unique properties that make them valuable for a wide range of applications.
The angular velocity depends upon the rate of change of the _______. - a)Angular Distance
- b)Angular acceleration
- c)Angular Displacement
- d)torque
Correct answer is option 'B'. Can you explain this answer?
The angular velocity depends upon the rate of change of the _______.
a)
Angular Distance
b)
Angular acceleration
c)
Angular Displacement
d)
torque
|
|
Eshaan Kapoor answered |
The angular velocity is defined as the rate of change of angular displacement and is a vector quantity which specifies the angular speed of an object and the axis about which the object is rotating.
Pure water is bad conductor of electricity because it is –- a)feebly ionized
- b)not volatile
- c)a very good solvent
- d)a non-polar solvent
Correct answer is option 'A'. Can you explain this answer?
Pure water is bad conductor of electricity because it is –
a)
feebly ionized
b)
not volatile
c)
a very good solvent
d)
a non-polar solvent
|
Dia Mehta answered |
Pure water is a covalent compound. It exists as simple discrete molecules and have a simple molecular structure. Hence, it does not exist as ions. Therefore, pure water cannot conduct electricity due to the absence of mobile ions and electrons. One instance that water can conduct electricity is when there are dissolved substance in it. Only then will water dissociate into hydrogen ions and hydroxide ions. The presence of mobile ions enables it to conduct electricity.
Speed of transverse wave in a string of density 100 kglm3 and area of cross-section 10 mm2 under the tension of 103 N is :- a)200 m/s
- b)1000 m/s
- c)2000 m/s
- d)100 m/s
Correct answer is option 'B'. Can you explain this answer?
Speed of transverse wave in a string of density 100 kglm3 and area of cross-section 10 mm2 under the tension of 103 N is :
a)
200 m/s
b)
1000 m/s
c)
2000 m/s
d)
100 m/s
|
|
Yashvi Roy answered |
Here, m = mass per unit length = pS
The correct answer is: 1000 m/s
Sensation of sound persists in our brain for about -- a)0.001s
- b)0.2s
- c)0.1s
- d)10s
Correct answer is option 'C'. Can you explain this answer?
Sensation of sound persists in our brain for about -
a)
0.001s
b)
0.2s
c)
0.1s
d)
10s
|
Tushar Desai answered |
Understanding Auditory Sensation Persistence
The phenomenon of sound sensation persisting in our brain is known as auditory sensory memory or echoic memory. This is a crucial aspect of how we experience and interpret sounds in our environment.
Duration of Sound Persistence
- The correct answer is 0.1 seconds.
- This brief duration allows the brain to process and integrate sounds effectively.
Mechanism of Echoic Memory
- Echoic memory is a type of sensory memory. It holds auditory information for a short period, typically around 0.1 seconds.
- This fleeting persistence enables us to perceive sound sequences and comprehend speech without interruption.
Importance in Daily Life
- The ability to retain sound information for a short time is vital for language comprehension.
- It helps in distinguishing between different sounds and recognizing patterns in music or conversation.
Comparison with Other Sensory Memories
- Visual sensory memory (iconic memory) lasts longer, around 0.25 seconds.
- However, auditory sensations are processed rapidly, which is essential for effective communication and reaction to auditory stimuli.
Conclusion
Understanding the persistence of sound sensations in our brain is important for grasping how we process auditory information. The brief duration of 0.1 seconds allows us to engage with our environment, facilitating communication and interaction. This insight is particularly relevant in fields such as psychology, cognitive sciences, and education.
The phenomenon of sound sensation persisting in our brain is known as auditory sensory memory or echoic memory. This is a crucial aspect of how we experience and interpret sounds in our environment.
Duration of Sound Persistence
- The correct answer is 0.1 seconds.
- This brief duration allows the brain to process and integrate sounds effectively.
Mechanism of Echoic Memory
- Echoic memory is a type of sensory memory. It holds auditory information for a short period, typically around 0.1 seconds.
- This fleeting persistence enables us to perceive sound sequences and comprehend speech without interruption.
Importance in Daily Life
- The ability to retain sound information for a short time is vital for language comprehension.
- It helps in distinguishing between different sounds and recognizing patterns in music or conversation.
Comparison with Other Sensory Memories
- Visual sensory memory (iconic memory) lasts longer, around 0.25 seconds.
- However, auditory sensations are processed rapidly, which is essential for effective communication and reaction to auditory stimuli.
Conclusion
Understanding the persistence of sound sensations in our brain is important for grasping how we process auditory information. The brief duration of 0.1 seconds allows us to engage with our environment, facilitating communication and interaction. This insight is particularly relevant in fields such as psychology, cognitive sciences, and education.
Good conductor of electricity is –- a)dry air
- b)paper
- c)kerosene
- d)graphite
Correct answer is option 'D'. Can you explain this answer?
Good conductor of electricity is –
a)
dry air
b)
paper
c)
kerosene
d)
graphite
|
|
Eshaan Kapoor answered |
Graphite has a tendency to behave very much like a metal because the carbon molecules arrange themselves into a lattice structure. The crystal lattice is the same orientation that metal forms, and it allows the free-movement of electrons, making it a good electrical conductor. The characteristics possesses by the graphite for conduction is far better than the dry air paper and kerosene and that's what makes it a good conductor.
Pycnometer is an instrument used to measure the –- a)Density
- b)Intensity of solar radiation
- c)Intensity of earthquake
- d)High temperatures
Correct answer is option 'A'. Can you explain this answer?
Pycnometer is an instrument used to measure the –
a)
Density
b)
Intensity of solar radiation
c)
Intensity of earthquake
d)
High temperatures
|
|
Aryan Khanna answered |
A gas pycnometer is a laboratory device used for measuring the density — or more accurately the volume — of solids, be they regularly shaped, porous or non-porous, monolithic, powdered, granular or in some way comminuted, employing some method of has displacement and the volume-pressure relationship known as Boyle's Law.
Which of the following is/ are correct about the dwarf planets?
1. A dwarf planet is a planetary-mass object that is neither a planet nor a satellite.
2. A dwarf planet is a celestial body in direct orbit of the Sun that is massive enough for its shape to be controlled by gravitation, but that unlike a planet has not cleared its orbital region of other objects.
3. Dwarf planets are any astronomical objects orbiting the Sun that did not show the disk of a planet and were not observed to have the characteristics of an active comet.
4. Dwarf planets are formed out of cosmic dust grains that collide and stick to form larger and larger bodies.- a)1, 2 and 3
- b)2 and 3
- c)2, 3 and 4
- d)1 and 2
Correct answer is option 'D'. Can you explain this answer?
Which of the following is/ are correct about the dwarf planets?
1. A dwarf planet is a planetary-mass object that is neither a planet nor a satellite.
2. A dwarf planet is a celestial body in direct orbit of the Sun that is massive enough for its shape to be controlled by gravitation, but that unlike a planet has not cleared its orbital region of other objects.
3. Dwarf planets are any astronomical objects orbiting the Sun that did not show the disk of a planet and were not observed to have the characteristics of an active comet.
4. Dwarf planets are formed out of cosmic dust grains that collide and stick to form larger and larger bodies.
1. A dwarf planet is a planetary-mass object that is neither a planet nor a satellite.
2. A dwarf planet is a celestial body in direct orbit of the Sun that is massive enough for its shape to be controlled by gravitation, but that unlike a planet has not cleared its orbital region of other objects.
3. Dwarf planets are any astronomical objects orbiting the Sun that did not show the disk of a planet and were not observed to have the characteristics of an active comet.
4. Dwarf planets are formed out of cosmic dust grains that collide and stick to form larger and larger bodies.
a)
1, 2 and 3
b)
2 and 3
c)
2, 3 and 4
d)
1 and 2
|
|
Nidhi Pillai answered |
A dwarf planet is a planetary-mass object that is neither a planet nor a satellite. More explicitly, the International Astronomical Union (IAU) defines a dwarf planet as a celestial body in direct orbit of the Sun that is massive enough for its shape to be controlled by gravitation, but that unlike a planet has not cleared its orbital region of other objects.The point 3 refers to asteroids.
Consider the following statements regarding the High Frequency Active Auroral Research Programme (HAARP):
1. It is an ionospheric research Program.
2. The purpose of HAARP is to investigate the potential for developing ionospheric enhancement technology for radio communications and surveillance.
3. The most prominent instrument at the HAARP station is the Ionospheric Research Instrument (IRI) a high-power radio frequency transmitter facility operating in the High Frequency (HF) band.
Q. Which of the statements given above are correct?- a)1 and 2 only
- b)2 and 3 only
- c)1 and 3 only
- d)1, 2 and 3
Correct answer is option 'D'. Can you explain this answer?
Consider the following statements regarding the High Frequency Active Auroral Research Programme (HAARP):
1. It is an ionospheric research Program.
2. The purpose of HAARP is to investigate the potential for developing ionospheric enhancement technology for radio communications and surveillance.
3. The most prominent instrument at the HAARP station is the Ionospheric Research Instrument (IRI) a high-power radio frequency transmitter facility operating in the High Frequency (HF) band.
Q. Which of the statements given above are correct?
1. It is an ionospheric research Program.
2. The purpose of HAARP is to investigate the potential for developing ionospheric enhancement technology for radio communications and surveillance.
3. The most prominent instrument at the HAARP station is the Ionospheric Research Instrument (IRI) a high-power radio frequency transmitter facility operating in the High Frequency (HF) band.
Q. Which of the statements given above are correct?
a)
1 and 2 only
b)
2 and 3 only
c)
1 and 3 only
d)
1, 2 and 3
|
|
Sneha Kumar answered |
High Frequency Active Auroral Research Programme (HAARP) is an ionspheric research programme and the main purpose is to investigate the potential for developing ionaspheric enhancement technology for radio communications and surveillance.
Consider the following statements regarding Indian polar research station:
1. India established a research station named “Bharti” at Ny-Alesund in Svalbard region of Norway.
2. India established a research station named “Himadri” in the Larsemann Hills region of East Antarctica.
Q. Which of the statements given above is/are correct?- a)1 only
- b)2 only
- c)Both 1 and 2
- d)Neither 1 nor 2
Correct answer is option 'D'. Can you explain this answer?
Consider the following statements regarding Indian polar research station:
1. India established a research station named “Bharti” at Ny-Alesund in Svalbard region of Norway.
2. India established a research station named “Himadri” in the Larsemann Hills region of East Antarctica.
Q. Which of the statements given above is/are correct?
1. India established a research station named “Bharti” at Ny-Alesund in Svalbard region of Norway.
2. India established a research station named “Himadri” in the Larsemann Hills region of East Antarctica.
Q. Which of the statements given above is/are correct?
a)
1 only
b)
2 only
c)
Both 1 and 2
d)
Neither 1 nor 2
|
|
Sravya Bose answered |
Both the statements regarding Indian Polar Research stations are incorrect. India's first expedition to Antarctica was in 1981, she expanded it by undertaking its first Arctic expedition in August 2007 by setting up 'Himadri' at Nye–Alesund in Norway in 2008 to mark the International Polar Year (IPY). The first Antarctic research station was Gangotri (1983) and second was Maitri (1989). 'Bharti' or 'Bharthi' is the third Antarctic station at Larsemann in East Antarctica.
A light year is a measure of : - a)Speed
- b)Velocity
- c)Distance
- d)Time
Correct answer is option 'C'. Can you explain this answer?
A light year is a measure of :
a)
Speed
b)
Velocity
c)
Distance
d)
Time
|
|
Aryan Khanna answered |
A light-year is a unit of length equal to just under 10 trillion kilometres (or about 6 trillion miles). As defined by the International Astronomical Union (TAU), a light-year is the distance that light travels in a vacuum in one Julian year. Note that the lightyear is a measure of distance (rather than, as is sometimes misunderstood, a measure of time).
Which one of the following is not correctly matched?- a)Akash — A medium range multi-target missile
- b)Nag — An anti-tank missile
- c)Pinaka — A multi-barrel rocket launcher weapon system
- d)Trishul — A short range surface to surface missile
Correct answer is option 'D'. Can you explain this answer?
Which one of the following is not correctly matched?
a)
Akash — A medium range multi-target missile
b)
Nag — An anti-tank missile
c)
Pinaka — A multi-barrel rocket launcher weapon system
d)
Trishul — A short range surface to surface missile
|
|
Madhurima Chauhan answered |
Akash is a medium–range mobile surface–to– air missile. Nag is an antitank missile by DRDO. Pinaka is a multiple rocket launcher produced for Indian Army by DRDO while Trishul is a missile system of a short range surface to–air missile as a part of the Integrated Guided Missile Development Program.
Gamma rays have greatest similarity with –- a)α-rays
- b)β-rays
- c)X-rays
- d)U.V.-rays
Correct answer is option 'C'. Can you explain this answer?
Gamma rays have greatest similarity with –
a)
α-rays
b)
β-rays
c)
X-rays
d)
U.V.-rays
|
|
Aryan Khanna answered |
Gamma radiation, also known as gamma rays or hyphenated as gamma-rays and denoted as y, is electromagnetic radiation of high frequency and therefore high energy. Gamma rays are ionizing radiation and are thus biologically hazardous. They are classically produced by the decay from high energy states of atomic nuclei (gamma decay), but are also created by other processes.
Eclipses occur due to which optical phenomena? - a)Reflection
- b)Refraction
- c)Rectilinear propagation
- d)Diffraction
Correct answer is option 'C'. Can you explain this answer?
Eclipses occur due to which optical phenomena?
a)
Reflection
b)
Refraction
c)
Rectilinear propagation
d)
Diffraction
|
|
Aryan Khanna answered |
An eclipse is an astronomical event that occurs when an astronomical object is temporarily obscured, either by passing into the shadow of another body or by having another body pass between it and the viewer. Rectilinear propagation is a wave property which states that waves propagate (move or spread out) in straight lines.
The earth’s satellite is kept moving in its orbit. It is due to the phenomenon of centripetal force provided by- a)the rocket engine propelling the satellite
- b)the gravitational attraction of the earth on the satellite
- c)the gravitational attraction of the sun on the satellite
- d)the gravitational attraction of satellite on earth
Correct answer is option 'B'. Can you explain this answer?
The earth’s satellite is kept moving in its orbit. It is due to the phenomenon of centripetal force provided by
a)
the rocket engine propelling the satellite
b)
the gravitational attraction of the earth on the satellite
c)
the gravitational attraction of the sun on the satellite
d)
the gravitational attraction of satellite on earth
|
|
Dishani Sarkar answered |
An orbiting satellite is a projectile, that the only force acting upon an oribiting satellite is the force of gravity. The force of gravity also accelerates it towards the earth. But the earth's round shape prevents it to fall on ground and if the satellite is in more than 8000 m/s speed it also contributes to the maintenance of motion in a particular orbit or elliptical path.
Which of the following is used for regulated electric supply? - a)Zener diode
- b)Junction diode
- c)Gun diode
- d)Tunnel diode
Correct answer is option 'A'. Can you explain this answer?
Which of the following is used for regulated electric supply?
a)
Zener diode
b)
Junction diode
c)
Gun diode
d)
Tunnel diode
|
Athul Sharma answered |
Understanding Regulated Electric Supply
When it comes to regulated electric supply, the choice of components plays a crucial role. Among the options provided, the Zener diode stands out as the most effective device for this purpose.
What is a Zener Diode?
- A Zener diode is a special type of semiconductor diode that allows current to flow in the reverse direction when a specific voltage, known as the Zener voltage, is reached.
- It is designed to operate in the breakdown region, making it ideal for voltage regulation.
How Does it Regulate Voltage?
- The Zener diode maintains a constant output voltage despite variations in input voltage or load conditions.
- When the input voltage exceeds the Zener voltage, the diode conducts in reverse, clamping the output voltage to the desired level.
Applications of Zener Diodes:
- Used in power supplies to provide a stable reference voltage.
- Employed in voltage regulation circuits to protect sensitive components from voltage spikes.
- Commonly found in various electronic devices, ensuring reliable operation.
Comparison with Other Diodes:
- Junction Diode: Primarily used for rectification and does not provide voltage regulation.
- Gun Diode: Mainly used in microwave applications and not suitable for voltage regulation.
- Tunnel Diode: Known for its high-speed switching capabilities, but not used for voltage regulation.
In summary, the Zener diode is the most suitable component for regulated electric supply due to its ability to maintain a constant voltage, making it essential in various electronic applications.
When it comes to regulated electric supply, the choice of components plays a crucial role. Among the options provided, the Zener diode stands out as the most effective device for this purpose.
What is a Zener Diode?
- A Zener diode is a special type of semiconductor diode that allows current to flow in the reverse direction when a specific voltage, known as the Zener voltage, is reached.
- It is designed to operate in the breakdown region, making it ideal for voltage regulation.
How Does it Regulate Voltage?
- The Zener diode maintains a constant output voltage despite variations in input voltage or load conditions.
- When the input voltage exceeds the Zener voltage, the diode conducts in reverse, clamping the output voltage to the desired level.
Applications of Zener Diodes:
- Used in power supplies to provide a stable reference voltage.
- Employed in voltage regulation circuits to protect sensitive components from voltage spikes.
- Commonly found in various electronic devices, ensuring reliable operation.
Comparison with Other Diodes:
- Junction Diode: Primarily used for rectification and does not provide voltage regulation.
- Gun Diode: Mainly used in microwave applications and not suitable for voltage regulation.
- Tunnel Diode: Known for its high-speed switching capabilities, but not used for voltage regulation.
In summary, the Zener diode is the most suitable component for regulated electric supply due to its ability to maintain a constant voltage, making it essential in various electronic applications.
What is found in frequency modulation? - a)Fixed frequency
- b)Fixed dimension
- c)Change in frequency and dimension
- d)Change in dimension only
Correct answer is option 'A'. Can you explain this answer?
What is found in frequency modulation?
a)
Fixed frequency
b)
Fixed dimension
c)
Change in frequency and dimension
d)
Change in dimension only
|
|
Eshaan Kapoor answered |
Frequency modulation (FM) conveys information over a carrier wave by varying its instantaneous frequency. This contrasts with amplitude modulation, in which the amplitude of the carrier is varied while its frequency remains constant. Frequency modulation is also used in telemetry, radar, seismic prospecting and newborn EEG seizure monitoring.
Which physical quantity is measured in ‘siemens’?- a)Electric potential
- b)Electrical conductance
- c)Magnetic flux
- d)Refractive index
Correct answer is option 'B'. Can you explain this answer?
Which physical quantity is measured in ‘siemens’?
a)
Electric potential
b)
Electrical conductance
c)
Magnetic flux
d)
Refractive index
|
|
Dia Mehta answered |
The Siemens is the unit of electric conductance, electric susceptance and electric admittance in the International System of Units (SI).
The new version of advanced television, beyond the high definition television is 4 K television. Consider the following statements in this regard?
1. The basic principle of 4K TV is Near Field Communication (NFC).
2. The term 4K refers to the horizontal resolution of the images, which are all on the order of 4,000 pixels. 3. If the screen is too big then the HD gives the blurred images because the resolution of the images and pixels are limited.Q. Which of the statements given above are correct?- a)1 and 2 only
- b)2 and 3 only
- c)1 and 3 only
- d)1, 2 and 3
Correct answer is option 'B'. Can you explain this answer?
The new version of advanced television, beyond the high definition television is 4 K television. Consider the following statements in this regard?
1. The basic principle of 4K TV is Near Field Communication (NFC).
2. The term 4K refers to the horizontal resolution of the images, which are all on the order of 4,000 pixels. 3. If the screen is too big then the HD gives the blurred images because the resolution of the images and pixels are limited.
1. The basic principle of 4K TV is Near Field Communication (NFC).
2. The term 4K refers to the horizontal resolution of the images, which are all on the order of 4,000 pixels. 3. If the screen is too big then the HD gives the blurred images because the resolution of the images and pixels are limited.
Q. Which of the statements given above are correct?
a)
1 and 2 only
b)
2 and 3 only
c)
1 and 3 only
d)
1, 2 and 3
|
|
Anirudh Joshi answered |
4K TV is an Ultra high definition television. UHDTV, has horizontal resolution on the order of 4,000 pixels. Since its screen is too big the HD gives blurred images.
Orbital decay, a process of prolonged reduction in the attitude of a Satellite’s Orbit is caused by which of the following reasons?
1. Atmospheric drag
2. Tides
3. Gravitational pull Correct - a)1 only
- b)3 only
- c)1 and 3 only
- d)1, 2 and 3
Correct answer is option 'D'. Can you explain this answer?
Orbital decay, a process of prolonged reduction in the attitude of a Satellite’s Orbit is caused by which of the following reasons?
1. Atmospheric drag
2. Tides
3. Gravitational pull Correct
1. Atmospheric drag
2. Tides
3. Gravitational pull Correct
a)
1 only
b)
3 only
c)
1 and 3 only
d)
1, 2 and 3
|
|
Surbhi Basu answered |
Orbital decay, a process of prolonged reduction in the altitude of a satellite’s orbit is caused due to atmospheric drag, tides and gravitational pull.
Consider the following statements:
1. European Space Agency (ESA) has joined the NASA’s Euclid Mission to be launched in 2020.
2. Euclid Mission is a space telescope designed to investigate the cosmological mysteries of dark matter and dark energy.Q. Which of the statements given above is/are correct?- a)1 only
- b)2 only
- c)Both 1 and 2
- d)Neither 1 nor 2
Correct answer is option 'C'. Can you explain this answer?
Consider the following statements:
1. European Space Agency (ESA) has joined the NASA’s Euclid Mission to be launched in 2020.
2. Euclid Mission is a space telescope designed to investigate the cosmological mysteries of dark matter and dark energy.
1. European Space Agency (ESA) has joined the NASA’s Euclid Mission to be launched in 2020.
2. Euclid Mission is a space telescope designed to investigate the cosmological mysteries of dark matter and dark energy.
Q. Which of the statements given above is/are correct?
a)
1 only
b)
2 only
c)
Both 1 and 2
d)
Neither 1 nor 2
|
|
Shreya Mishra answered |
NASA has joined the European space Agency’s (ESA’) Euclid mission, a telescope designed to investigate the cosmological mysteries of dark matter and dark energy. Euclid is a medium –class (“M–class”) mission and is part of ESA’s “Cosmic Vision”, 2015–2025 scientific program.
Consider the following statements:
1. Nirbhaya is a subsonic cruise missile being developed by DRDO.
2. The air version of Brahmos has been successfully test-fired recently.
3. Brahmos-II will be hypersonic cruise missile with target range of more than 300 km.Q. Which of the above statements is/are not true?- a)1 and 2 only
- b)2 and 3 only
- c)all of the above
- d)none of these
Correct answer is option 'D'. Can you explain this answer?
Consider the following statements:
1. Nirbhaya is a subsonic cruise missile being developed by DRDO.
2. The air version of Brahmos has been successfully test-fired recently.
3. Brahmos-II will be hypersonic cruise missile with target range of more than 300 km.
1. Nirbhaya is a subsonic cruise missile being developed by DRDO.
2. The air version of Brahmos has been successfully test-fired recently.
3. Brahmos-II will be hypersonic cruise missile with target range of more than 300 km.
Q. Which of the above statements is/are not true?
a)
1 and 2 only
b)
2 and 3 only
c)
all of the above
d)
none of these
|
सिद्धि शिशोदिया answered |
Ans.no.b
Lamberts law is related to –- a)Reflection
- b)Refraction
- c)Interference
- d)Illumination
Correct answer is option 'D'. Can you explain this answer?
Lamberts law is related to –
a)
Reflection
b)
Refraction
c)
Interference
d)
Illumination
|
|
Chetna iyer answered |
The attenuation of light as it passes through a medium.
In a refrigerator, the cooling system should always be –- a)at the top
- b)at the bottom
- c)at the middle
- d)can be anywhere
Correct answer is option 'B'. Can you explain this answer?
In a refrigerator, the cooling system should always be –
a)
at the top
b)
at the bottom
c)
at the middle
d)
can be anywhere
|
|
Dia Mehta answered |
The compressor is the motor (or engine) of the cooling system. It is normally at the bottom of the refrigerator in the back. The compressor runs whenever the refrigerator thermostat calls for cooling.
Which among the following waves is used for communication by artificial satellites? - a)Micro waves
- b)Radio waves
- c)A. M.
- d)Frequency of 1016 series
Correct answer is option 'A'. Can you explain this answer?
Which among the following waves is used for communication by artificial satellites?
a)
Micro waves
b)
Radio waves
c)
A. M.
d)
Frequency of 1016 series
|
|
Dia Mehta answered |
For fixed (point-to-point) services, communications satellites provide a microwave radio relay technology complementary to that of communication cables. They are also used for mobile applications such as communications to ships, vehicles, planes and hand-held terminals, and for TV and radio broadcasting. Microwave technology is extensively used for point-to-point telecommunications (i.e., non broadcast uses).
Consider the following statements with respect to the new Remote Sensing Data Policy:
1. Agencies other than ISRO can also be nodal agencies for remote sensing.
2. All remote sensing imagery and data up to one meter resolution will be made freely available.
3. The old 2001 policy mandated that ISRO could release only data up to 6.8 resolutions.Q. Which of the statements given above are correct?- a)1 and 2 only
- b)1 and 3 only
- c)2 and 3 only
- d)1, 2 and 3
Correct answer is option 'A'. Can you explain this answer?
Consider the following statements with respect to the new Remote Sensing Data Policy:
1. Agencies other than ISRO can also be nodal agencies for remote sensing.
2. All remote sensing imagery and data up to one meter resolution will be made freely available.
3. The old 2001 policy mandated that ISRO could release only data up to 6.8 resolutions.
1. Agencies other than ISRO can also be nodal agencies for remote sensing.
2. All remote sensing imagery and data up to one meter resolution will be made freely available.
3. The old 2001 policy mandated that ISRO could release only data up to 6.8 resolutions.
Q. Which of the statements given above are correct?
a)
1 and 2 only
b)
1 and 3 only
c)
2 and 3 only
d)
1, 2 and 3
|
|
Akshita Datta answered |
The old 2001 policy mandated that ISRO could release only data upto 5.8 meter resolution.
When the speed of car is doubled, then what will be the braking force of the car to stop it in the same distance? - a)four times
- b)two times
- c)half
- d)one-fourth
Correct answer is option 'A'. Can you explain this answer?
When the speed of car is doubled, then what will be the braking force of the car to stop it in the same distance?
a)
four times
b)
two times
c)
half
d)
one-fourth
|
Faizan Khan answered |
Brake force, also known as Brake Power, is a measure of braking power of a vehicle. Suppose a car whose mass is 'x' and is braked from a speed of y km/hr to come to halt at a uniform retardation in z min. If the speed of the car is doubled in the same distance, then the braking force required to stop the car is four times the original speed i.e. '4v'. Note that all the parameters remain to be same.
The mass and energy equivalent to 1 a.m.u. respectively are -- a)1.67 x 10−27 g, 9.30 MeV
- b)1.67 x 10−27kg, 930 MeV
- c)1.67 x 10−27kg, 1 MeV
- d)1.67 x 10−34 kg, 1 MeV
Correct answer is option 'B'. Can you explain this answer?
The mass and energy equivalent to 1 a.m.u. respectively are -
a)
1.67 x 10−27 g, 9.30 MeV
b)
1.67 x 10−27kg, 930 MeV
c)
1.67 x 10−27kg, 1 MeV
d)
1.67 x 10−34 kg, 1 MeV
|
|
Dia Mehta answered |
The mass and energy equivalent to 1 a.m.u. respectively are 1.67 x 10−27kg, 930 MeV.
Water is not suitable as a calorimetric substance because it –- a)has high specific heat
- b)is a good conductor
- c)has high boiling point
- d)low latent heat of vaporization
Correct answer is option 'A'. Can you explain this answer?
Water is not suitable as a calorimetric substance because it –
a)
has high specific heat
b)
is a good conductor
c)
has high boiling point
d)
low latent heat of vaporization
|
Animesh kulkarni answered |
Has a high specific heat capacity, meaning it requires a lot of energy to change its temperature. This makes it difficult to accurately measure the amount of heat transferred in a reaction using water as a calorimetric substance. Additionally, water can evaporate, which can cause a loss of heat and affect the accuracy of the measurement. Therefore, other substances with lower specific heat capacities and less propensity to evaporate are used as calorimetric substances, such as metals, oils, and gases.
Energy that is produced commercially from coal is called –- a)Light energy
- b)Kinetic energy
- c)Thermal energy
- d)Potential energy
Correct answer is option 'C'. Can you explain this answer?
Energy that is produced commercially from coal is called –
a)
Light energy
b)
Kinetic energy
c)
Thermal energy
d)
Potential energy
|
|
Dia Mehta answered |
Thermal enemy, but in most cases coal is used for electricity. The steel industry uses coal (or coke rather) in blast furnaces. Thermal energy is the part of the total internal energy of a thermodynamic system or sample of matter that results in the system temperature. This quantity may be difficult to determine or even meaningless unless the system has attained its temperature only through heating, and not been subjected to work input or output, or any other energy-changing processes.
Light year is the unit of -- a)Frequency
- b)Distance
- c)Energy
- d)Power
Correct answer is option 'B'. Can you explain this answer?
Light year is the unit of -
a)
Frequency
b)
Distance
c)
Energy
d)
Power
|
Garima patil answered |
**Explanation:**
The correct answer is option **B) Distance**.
A light-year is a unit of distance used in astronomy to measure large distances in space. It is defined as the distance that light travels in one year in a vacuum. Since light travels at a constant speed of approximately 299,792 kilometers per second (or about 186,282 miles per second), the distance covered by light in one year is immense.
To better understand the concept of a light-year, let's break down the distance calculation and the significance of using this unit in astronomy:
**Definition of a Light-Year:**
- A light-year is the distance that light travels in one year.
- Light travels at a speed of about 299,792 kilometers per second (or about 186,282 miles per second).
- Therefore, in one year, light can travel about 9.46 trillion kilometers (or about 5.88 trillion miles).
**Importance of Light-Years in Astronomy:**
- The vast distances between celestial objects in space make it impractical to use conventional units like kilometers or miles.
- Astronomers use light-years to measure the distances between stars, galaxies, and other objects in the universe.
- Light-years allow us to comprehend the enormous scale of the universe and the time it takes for light to travel across such vast distances.
**Examples of Light-Years:**
- The nearest star to Earth, Proxima Centauri, is approximately 4.24 light-years away.
- The Andromeda Galaxy, our closest neighboring galaxy, is about 2.537 million light-years away.
- The observable universe is estimated to be about 93 billion light-years in diameter.
In conclusion, a light-year is a unit of distance used in astronomy to measure the vast distances between celestial objects. It represents the distance that light travels in one year and is an essential tool for understanding the scale and size of the universe.
The correct answer is option **B) Distance**.
A light-year is a unit of distance used in astronomy to measure large distances in space. It is defined as the distance that light travels in one year in a vacuum. Since light travels at a constant speed of approximately 299,792 kilometers per second (or about 186,282 miles per second), the distance covered by light in one year is immense.
To better understand the concept of a light-year, let's break down the distance calculation and the significance of using this unit in astronomy:
**Definition of a Light-Year:**
- A light-year is the distance that light travels in one year.
- Light travels at a speed of about 299,792 kilometers per second (or about 186,282 miles per second).
- Therefore, in one year, light can travel about 9.46 trillion kilometers (or about 5.88 trillion miles).
**Importance of Light-Years in Astronomy:**
- The vast distances between celestial objects in space make it impractical to use conventional units like kilometers or miles.
- Astronomers use light-years to measure the distances between stars, galaxies, and other objects in the universe.
- Light-years allow us to comprehend the enormous scale of the universe and the time it takes for light to travel across such vast distances.
**Examples of Light-Years:**
- The nearest star to Earth, Proxima Centauri, is approximately 4.24 light-years away.
- The Andromeda Galaxy, our closest neighboring galaxy, is about 2.537 million light-years away.
- The observable universe is estimated to be about 93 billion light-years in diameter.
In conclusion, a light-year is a unit of distance used in astronomy to measure the vast distances between celestial objects. It represents the distance that light travels in one year and is an essential tool for understanding the scale and size of the universe.
ISRO space vision 2025 includes:
1. Satellite based communication and navigation systems mainly for rural connectivity.
2. Space science mission for better understanding of solar system and universe.
3. Reusable Launch Vehicles Technology demonstrator mission leading to Two-stageTo-orbit-(TSTO).
4. Planetary explorations to Mars and Venus. Which of the above statements is/are correct?- a)1 and 2
- b)2 and 4
- c)1, 2 and 3
- d)2, 3 and 4
Correct answer is option 'C'. Can you explain this answer?
ISRO space vision 2025 includes:
1. Satellite based communication and navigation systems mainly for rural connectivity.
2. Space science mission for better understanding of solar system and universe.
3. Reusable Launch Vehicles Technology demonstrator mission leading to Two-stageTo-orbit-(TSTO).
4. Planetary explorations to Mars and Venus. Which of the above statements is/are correct?
1. Satellite based communication and navigation systems mainly for rural connectivity.
2. Space science mission for better understanding of solar system and universe.
3. Reusable Launch Vehicles Technology demonstrator mission leading to Two-stageTo-orbit-(TSTO).
4. Planetary explorations to Mars and Venus. Which of the above statements is/are correct?
a)
1 and 2
b)
2 and 4
c)
1, 2 and 3
d)
2, 3 and 4
|
|
Arnab Saha answered |
ISRO space vision 2025 includes satellite based communication and navigation systems mainly for rural connectivity.
Multiple Independent Re-entry Vehicles (MIRVs) are used in Agni-V missile made by DRDO, consider the following statements in regard to MIRVs.
1. Under it, each missile will be capable of carrying 2-10 separate nuclear warheads.
2. Under it, each warhead can be assigned to a different target.
3. Under it, two or more warheads can be assigned to the same target.Q. Which of the following statements is/are correct?- a)1 only
- b)2 only
- c)2 and 3 only
- d)1, 2 and 3
Correct answer is option 'D'. Can you explain this answer?
Multiple Independent Re-entry Vehicles (MIRVs) are used in Agni-V missile made by DRDO, consider the following statements in regard to MIRVs.
1. Under it, each missile will be capable of carrying 2-10 separate nuclear warheads.
2. Under it, each warhead can be assigned to a different target.
3. Under it, two or more warheads can be assigned to the same target.
1. Under it, each missile will be capable of carrying 2-10 separate nuclear warheads.
2. Under it, each warhead can be assigned to a different target.
3. Under it, two or more warheads can be assigned to the same target.
Q. Which of the following statements is/are correct?
a)
1 only
b)
2 only
c)
2 and 3 only
d)
1, 2 and 3
|
|
Devanshi Chavan answered |
Multiple Independent Re–entry Vehicle (MIRV) is a ballistic missile payload or "bus" of a ballistic missile. It is capable of being aimed to hit one of a group of targets. A unitary warhead is a single warhead on a single missile Multiple re-entry vehicle (MRV) is an intermediate case in which the MRV missile carries several reentry vehicles, which can be dispersed but not individually aimed.
Which of the following statements is correct regarding the SKA telescope?
1. At present, it has 36 antennas with diameter of 12 meters each and it is placed at the remote Murchison Radio Astronomy Observatory
2. The radio waves generated from this telescope can provide details of the cosmos far away and the gases that resulted in the formation of any particular star.
Q. Select the correct answer using the codes given below:
- a)1 only
- b)2 only
- c)Neither 1 nor 2
- d)Both 1 and 2
Correct answer is option 'D'. Can you explain this answer?
Which of the following statements is correct regarding the SKA telescope?
1. At present, it has 36 antennas with diameter of 12 meters each and it is placed at the remote Murchison Radio Astronomy Observatory
2. The radio waves generated from this telescope can provide details of the cosmos far away and the gases that resulted in the formation of any particular star.
Q. Select the correct answer using the codes given below:
1. At present, it has 36 antennas with diameter of 12 meters each and it is placed at the remote Murchison Radio Astronomy Observatory
2. The radio waves generated from this telescope can provide details of the cosmos far away and the gases that resulted in the formation of any particular star.
Q. Select the correct answer using the codes given below:
a)
1 only
b)
2 only
c)
Neither 1 nor 2
d)
Both 1 and 2
|
|
Shreya Mishra answered |
Statement 2 is correct: Yes, radio telescopes can provide details about the cosmos and the gases that formed stars.
Statement 1 is correct: Yes, the Murchison Radio-astronomy Observatory (MRO) in Western Australia has 36 identical antennas, each 12 meters in diameter. These antennas are part of the Australian Square Kilometre Array Pathfinder (ASKAP), which is a single astronomical interferometer with a total collecting area of around 4,000 square meters.
Both 1 and 2 are correct.
Statement 1 is correct: Yes, the Murchison Radio-astronomy Observatory (MRO) in Western Australia has 36 identical antennas, each 12 meters in diameter. These antennas are part of the Australian Square Kilometre Array Pathfinder (ASKAP), which is a single astronomical interferometer with a total collecting area of around 4,000 square meters.
Both 1 and 2 are correct.
Indian Space Research Organisation (ISRO) and the United States Space Agency NASA, have agreed to form a working group for co-operation in which of the following endeavours?- a)Moon and Mars Missions of future
- b)Meteorology and Space Exploration
- c)Heliophysics
- d)All of the above
Correct answer is option 'D'. Can you explain this answer?
Indian Space Research Organisation (ISRO) and the United States Space Agency NASA, have agreed to form a working group for co-operation in which of the following endeavours?
a)
Moon and Mars Missions of future
b)
Meteorology and Space Exploration
c)
Heliophysics
d)
All of the above
|
|
Anshul Ghosh answered |
ISRO and NASA have agreed to form a working group for co-operation in Moon and Mars mission for future metrology and space exploration and also in Helio physics.
Consider the following statements with respect to Intelligent Flight Control System (IFCS):
1. It is developed by NASA
2. It is used in NF-15B aircraft
3. The IFCS Generation-I flight was first tested in 2003.
4. An artificial neural network is used in this control sytem.Q. Which of the following statement codes are correct?- a)1 and 2 only
- b)2, 3 and 4 only
- c)1, 2, 3 and 4
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
Consider the following statements with respect to Intelligent Flight Control System (IFCS):
1. It is developed by NASA
2. It is used in NF-15B aircraft
3. The IFCS Generation-I flight was first tested in 2003.
4. An artificial neural network is used in this control sytem.
1. It is developed by NASA
2. It is used in NF-15B aircraft
3. The IFCS Generation-I flight was first tested in 2003.
4. An artificial neural network is used in this control sytem.
Q. Which of the following statement codes are correct?
a)
1 and 2 only
b)
2, 3 and 4 only
c)
1, 2, 3 and 4
d)
None of these
|
|
Diya Singh answered |
Statement Analysis:
Let's analyze each statement one by one:
Statement 1: It is developed by NASA.
Statement 2: It is used in NF-15B aircraft.
Statement 3: The IFCS Generation-I flight was first tested in 2003.
Statement 4: An artificial neural network is used in this control system.
Explanation:
Statement 1: It is developed by NASA.
The Intelligent Flight Control System (IFCS) is not specifically developed by NASA. It is a general term used to describe advanced flight control systems that incorporate intelligent algorithms and technologies.
Therefore, statement 1 is incorrect.
Statement 2: It is used in NF-15B aircraft.
The NF-15B aircraft is a modified version of the F-15B Eagle aircraft used for research and development purposes. It has been used by NASA and other organizations for various flight experiments and testing. While it is possible that an Intelligent Flight Control System (IFCS) could be used in the NF-15B aircraft, the statement does not provide enough information to confirm this.
Therefore, statement 2 is ambiguous and cannot be determined as correct or incorrect.
Statement 3: The IFCS Generation-I flight was first tested in 2003.
The statement mentions the testing of the IFCS Generation-I flight in 2003. However, there is no specific information available to confirm or refute this claim. Without any supporting evidence, we cannot determine the accuracy of this statement.
Therefore, statement 3 is ambiguous and cannot be determined as correct or incorrect.
Statement 4: An artificial neural network is used in this control system.
An artificial neural network (ANN) is a type of computational model inspired by the structure and functions of biological neural networks. ANNs have been widely used in various fields, including aerospace engineering, for tasks such as control systems, pattern recognition, and optimization. It is possible that an ANN could be used in an Intelligent Flight Control System (IFCS) to enhance its capabilities and performance.
Therefore, statement 4 is plausible and could be correct.
Conclusion:
Based on the analysis, statement 1 is incorrect, statement 2 and 3 are ambiguous, and statement 4 is plausible. Therefore, the correct answer is option 'C' - 1, 2, 3, and 4.
Let's analyze each statement one by one:
Statement 1: It is developed by NASA.
Statement 2: It is used in NF-15B aircraft.
Statement 3: The IFCS Generation-I flight was first tested in 2003.
Statement 4: An artificial neural network is used in this control system.
Explanation:
Statement 1: It is developed by NASA.
The Intelligent Flight Control System (IFCS) is not specifically developed by NASA. It is a general term used to describe advanced flight control systems that incorporate intelligent algorithms and technologies.
Therefore, statement 1 is incorrect.
Statement 2: It is used in NF-15B aircraft.
The NF-15B aircraft is a modified version of the F-15B Eagle aircraft used for research and development purposes. It has been used by NASA and other organizations for various flight experiments and testing. While it is possible that an Intelligent Flight Control System (IFCS) could be used in the NF-15B aircraft, the statement does not provide enough information to confirm this.
Therefore, statement 2 is ambiguous and cannot be determined as correct or incorrect.
Statement 3: The IFCS Generation-I flight was first tested in 2003.
The statement mentions the testing of the IFCS Generation-I flight in 2003. However, there is no specific information available to confirm or refute this claim. Without any supporting evidence, we cannot determine the accuracy of this statement.
Therefore, statement 3 is ambiguous and cannot be determined as correct or incorrect.
Statement 4: An artificial neural network is used in this control system.
An artificial neural network (ANN) is a type of computational model inspired by the structure and functions of biological neural networks. ANNs have been widely used in various fields, including aerospace engineering, for tasks such as control systems, pattern recognition, and optimization. It is possible that an ANN could be used in an Intelligent Flight Control System (IFCS) to enhance its capabilities and performance.
Therefore, statement 4 is plausible and could be correct.
Conclusion:
Based on the analysis, statement 1 is incorrect, statement 2 and 3 are ambiguous, and statement 4 is plausible. Therefore, the correct answer is option 'C' - 1, 2, 3, and 4.
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