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All questions of Class 9 Science for CTET & State TET Exam
Which of the following organelles lack membranes ?- a)Ribosome
- b)Lysosome
- c)Golgi body
- d)Nucleus
Correct answer is option 'A'. Can you explain this answer?
Which of the following organelles lack membranes ?
a)
Ribosome
b)
Lysosome
c)
Golgi body
d)
Nucleus
|
Madhavan Choudhury answered |
Ribosome exist as free structures that float throughout the cytoplasm of the cell. they do not have membranes, which allows them to pick up translational RNA released from the nucleus and grab onto free amino acids in order to produce protein chains.
An atom has a mass number of 23 and atomic number 11. The number of protons are_________.- a)11
- b)12
- c)23
- d)44
Correct answer is option 'A'. Can you explain this answer?
An atom has a mass number of 23 and atomic number 11. The number of protons are_________.
a)
11
b)
12
c)
23
d)
44
|
areen kalra answered |
The correct option is a. as sodium atom has atomic no 11and atomic no definition itself says that the total no of protons present inside the nucleus of an atom is known as atomic noso no of protons will be 11
Which organelle is called the suicide bag of the cell- a)Golgi bodies
- b)Centrosome
- c)Chloroplast
- d)Lysosome
Correct answer is option 'D'. Can you explain this answer?
Which organelle is called the suicide bag of the cell
a)
Golgi bodies
b)
Centrosome
c)
Chloroplast
d)
Lysosome
|
Ravi Verma answered |
Lysosomes are called suicide bags of the cells because they contain digestive enzymes to digest the food taken by cell and if these enzymes spread in the cell or the membrane of lysosomes break down then the digestive enzymes digest the whole cell and the cell dies
so they are called suicide bags of the cell
Rate of diffusion is the fastest in- a)Solids
- b)Liquids
- c)Gases
- d)None of these
Correct answer is option 'C'. Can you explain this answer?
Rate of diffusion is the fastest in
a)
Solids
b)
Liquids
c)
Gases
d)
None of these
|
|
Neeraj! answered |
Rate of diffusion is the fastest in Gases
The change of state from solid to liquid known as –
- a)Melting
- b)Boiling
- c)Sublimation
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
The change of state from solid to liquid known as –
a)
Melting
b)
Boiling
c)
Sublimation
d)
None of these
|
|
Amit Sharma answered |
The change of state from solid to liquid is known as Melting. This is a process in which a solid substance changes into a liquid on heating. Heat energy is required to break the bonds between molecules, allowing them to move around freely. This process is also known as fusion, and the amount of energy required is called the latent heat of fusion. In a phase diagram such as Figure 12.4.1, the melting point is the temperature at which a substance can transition from a solid to a liquid.
Under which of the following conditions we can boil water at room temperature?
- a)At low pressure
- b)At moderate pressure
- c)At very high pressure
- d)At atmospheric pressure
Correct answer is option 'A'. Can you explain this answer?
Under which of the following conditions we can boil water at room temperature?
a)
At low pressure
b)
At moderate pressure
c)
At very high pressure
d)
At atmospheric pressure
|
Varun Kumar answered |
At low pressure
Explanation: Boiling occurs when the vapor pressure of a liquid equals the external pressure. At lower pressures, the boiling point of water decreases. So, if the external pressure is reduced significantly (below atmospheric pressure), water can boil at room temperature. This phenomenon can be observed in a vacuum chamber, where the pressure is significantly reduced, allowing water to boil at room temperature.
Explanation: Boiling occurs when the vapor pressure of a liquid equals the external pressure. At lower pressures, the boiling point of water decreases. So, if the external pressure is reduced significantly (below atmospheric pressure), water can boil at room temperature. This phenomenon can be observed in a vacuum chamber, where the pressure is significantly reduced, allowing water to boil at room temperature.
Which substance undergo sublimation process –
- a)Naphthalene
- b)Br2
- c)Ice
- d)N2
Correct answer is option 'A'. Can you explain this answer?
Which substance undergo sublimation process –
a)
Naphthalene
b)
Br
2c)
Ice
d)
N2
|
Ruhi Shah answered |
Some substances that undergo sublimation include dry ice (solid carbon dioxide), iodine, camphor, and napthalene.
The boiling point of water on kelvin scale is –- a)573 K
- b)273 K
- c)373 K
- d)100 K
Correct answer is 'C'. Can you explain this answer?
The boiling point of water on kelvin scale is –
a)
573 K
b)
273 K
c)
373 K
d)
100 K
|
Om Menon answered |
Formula to change the value of celcious into kelvin is K=C+273 As we know that boiling point of water is 100 c. SO, K=100+273 K =373 k.
Can you explain the answer of this question below:Practice Test/Quiz or MCQ (Multiple Choice Questions) with Solutions of Chapter "Matter in our surroundings" are available for CBSE Class 9 Science and have been compiled as per the syllabus of CBSE Class 9 Science Q. Which of the following has the strongest interparticle force at the room temperature?- A:Nitrogen
- B:Mercury
- C:Iron
- D:Chalk
The answer is C.
Practice Test/Quiz or MCQ (Multiple Choice Questions) with Solutions of Chapter "Matter in our surroundings" are available for CBSE Class 9 Science and have been compiled as per the syllabus of CBSE Class 9 Science
Q. Which of the following has the strongest interparticle force at the room temperature?
A:
Nitrogen
B:
Mercury
C:
Iron
D:
Chalk
|
Sharanya shah answered |
Higher the melting point of a substance, greater will be the force of attraction between particles. The melting point of iron is considerably high, so the force of attraction between its particles is higher.
Gases have highest rate of diffusion among all the three states of matter.- a)True
- b)False
Correct answer is option 'A'. Can you explain this answer?
Gases have highest rate of diffusion among all the three states of matter.
a)
True
b)
False
|
|
Amit Kumar answered |
Diffusion is the property of matter which is based on the motion of its particles. Diffusion occurs in gases, liquids and solids. Diffusion is fastest in gases and slowest in solids. The rate of diffusion increases on increasing the temperature of the diffusing substance.
The large volumes of gases can be put into small volumes of cylinders because of their property known as compressibility.- a)True
- b)False
Correct answer is 'A'. Can you explain this answer?
The large volumes of gases can be put into small volumes of cylinders because of their property known as compressibility.
a)
True
b)
False
|
Hansa Sharma answered |
The large volumes of gases can be put into small volumes of cylinders because of their property known as compressibility. This is possible because of the large inter particle distance and weak force of attraction between the particles of gas.
The mass of the body on moon is 40kg, what is the weight on the earth. - a) 240kg
- b) 392N
- c) 240N
- d) 400kg
Correct answer is option 'B'. Can you explain this answer?
The mass of the body on moon is 40kg, what is the weight on the earth.
a)
240kg
b)
392N
c)
240N
d)
400kg
|
|
Arvind Singh answered |
Mass of body on moon is 40 kg.
Weight on earth = mg
=40kg�9.8m/s^2
=392N.
Name one common substance which can undergo a change in state upon heating or cooling.- a)Salt
- b)Water
- c)Sugar
- d)All of these
Correct answer is option 'B'. Can you explain this answer?
Name one common substance which can undergo a change in state upon heating or cooling.
a)
Salt
b)
Water
c)
Sugar
d)
All of these
|
|
Hansa Sharma answered |
Water can undergo a change in state upon heating and cooling. On heating above 1000C water change into gaseous state and on cooling below 00C it changes into solid state.
Water has boiling point equal to 100°C.- a)True
- b)False
Correct answer is option 'A'. Can you explain this answer?
Water has boiling point equal to 100°C.
a)
True
b)
False
|
Zzz answered |
It is true as boiling point of water is 100 degree Celsius, the statement is absolutely true and correct
Convert the temperature of 373°C to the kelvin scale ?- a)646 K
- b)546 K
- c)300 K
- d)500 K
Correct answer is option 'A'. Can you explain this answer?
Convert the temperature of 373°C to the kelvin scale ?
a)
646 K
b)
546 K
c)
300 K
d)
500 K
|
Nikhil Mehra answered |
We know that ,K = °C + 273.15
= 373 deg C + 273.15 deg C
= 646.15 deg C
Which has more inertia?- a)5 Rs coin
- b)1 Rs coin
- c)5 Rs note
- d)All have same inertia.
Correct answer is option 'A'. Can you explain this answer?
Which has more inertia?
a)
5 Rs coin
b)
1 Rs coin
c)
5 Rs note
d)
All have same inertia.
|
Molik answered |
Inertia is directly proportional to mass means if mass is more the inertia is more. so 5 re coin as the heaviest has most inertia
Camphor changes to gaseous state without changing into liquid.- a)True
- b)False
Correct answer is option 'A'. Can you explain this answer?
Camphor changes to gaseous state without changing into liquid.
a)
True
b)
False
|
|
Jithin Das answered |
It's true because camphor is sublime and it changes directly into gas without passing through the state of liquid. The process in which solid directly changes into gas without passing through the state of liquid is called sublimation.
Which of the following is not a compound?- a)marble
- b)washing soda
- c)quick lime
- d)brass
Correct answer is option 'D'. Can you explain this answer?
Which of the following is not a compound?
a)
marble
b)
washing soda
c)
quick lime
d)
brass
|
Yuvraj Singhaniya answered |
Compound is the combination of two or more elements chemically but brass is a mixture of two elements
Which of the following is not a mixture? a) Soap solutionb) Bloodc) Carbon dioxided) CoalCorrect answer is option 'C'. Can you explain this answer?
|
Gaurav Kumar answered |
Carbon dioxide is not a mixture since it contain fixed ratio of oxygen and carbon in 2:1, which is a property of compound not a mixture.
The process of change of a liquid into vapour at any temperature is called –- a)Diffusion
- b)Evaporation
- c)Cooling
- d)Heating
Correct answer is option 'B'. Can you explain this answer?
The process of change of a liquid into vapour at any temperature is called –
a)
Diffusion
b)
Evaporation
c)
Cooling
d)
Heating
|
|
Ravi Verma answered |
The process of conversion of a substance from the liquid state to its vapor state at any temperature below boiling point is called evaporation or vaporization.
The evaporation of a liquid occur only at- a)temperature more than 1000C
- b)temperature less than 1000C
- c)fixed temperature
- d)all temperatures
Correct answer is option 'D'. Can you explain this answer?
The evaporation of a liquid occur only at
a)
temperature more than 1000C
b)
temperature less than 1000C
c)
fixed temperature
d)
all temperatures
|
|
Ananya Sharma answered |
Evaporation is the process of conversion of liquid into gas below its boiling point.
Evaporation can occur at any temperature. Where as Boiling occurs at a specific temperature called as Boiling point.
Examples which can prove that evaporation can occur at any temperature:
1. Evaporation of water from water bodies.
2. Evaporation of water from wet clothes.
3. Evaporation of acetone when exposed to open air.
Temperature is one of the factor which effects the rate of EVAPORATION.
If temperature is more rate of EVAPORATION will be more.
A desert is ...................- a)an endless stretch of sand
- b)without rainfall
- c)without vegetation
- d)all of the above
Correct answer is option 'D'. Can you explain this answer?
A desert is ...................
a)
an endless stretch of sand
b)
without rainfall
c)
without vegetation
d)
all of the above
|
Parth Nambiar answered |
Desert
Desert is a geographical region that is characterized by extreme dryness and lack of precipitation. It is a vast expanse of land that receives very little rainfall, and as a result, vegetation is scarce, and sand is abundant.
Endless stretch of sand
Deserts are often associated with endless stretches of sand dunes, but this is not always the case. While sand dunes are a common feature of many deserts, there are also rocky deserts, and deserts that are characterized by vast plains of gravel and dirt.
Without rainfall
Deserts are defined by their lack of rainfall, with many receiving less than 10 inches of rain per year. This lack of rainfall is often due to their location, such as being situated in areas that are far from oceans or other moisture sources.
Without vegetation
The extreme dryness of deserts means that vegetation is scarce, with many deserts being home to only a few types of plants that are adapted to the harsh desert environment. These plants often have specialized adaptations to help them survive in the arid conditions, such as the ability to store water in their leaves or roots.
All of the above
In conclusion, deserts are characterized by their lack of rainfall, scarcity of vegetation, and often vast stretches of sand or rocky terrain. These features make deserts some of the most inhospitable places on Earth, but they are also home to a variety of unique and fascinating plant and animal species that have adapted to the harsh desert environment.
Desert is a geographical region that is characterized by extreme dryness and lack of precipitation. It is a vast expanse of land that receives very little rainfall, and as a result, vegetation is scarce, and sand is abundant.
Endless stretch of sand
Deserts are often associated with endless stretches of sand dunes, but this is not always the case. While sand dunes are a common feature of many deserts, there are also rocky deserts, and deserts that are characterized by vast plains of gravel and dirt.
Without rainfall
Deserts are defined by their lack of rainfall, with many receiving less than 10 inches of rain per year. This lack of rainfall is often due to their location, such as being situated in areas that are far from oceans or other moisture sources.
Without vegetation
The extreme dryness of deserts means that vegetation is scarce, with many deserts being home to only a few types of plants that are adapted to the harsh desert environment. These plants often have specialized adaptations to help them survive in the arid conditions, such as the ability to store water in their leaves or roots.
All of the above
In conclusion, deserts are characterized by their lack of rainfall, scarcity of vegetation, and often vast stretches of sand or rocky terrain. These features make deserts some of the most inhospitable places on Earth, but they are also home to a variety of unique and fascinating plant and animal species that have adapted to the harsh desert environment.
Name the process by which a drop of ink spreads in a beaker of water –
- a)Diffusion
- b)Vaporization
- c)Condensation
- d)Sublimation
Correct answer is option 'A'. Can you explain this answer?
Name the process by which a drop of ink spreads in a beaker of water –
a)
Diffusion
b)
Vaporization
c)
Condensation
d)
Sublimation
|
Prachi Rathore answered |
A drop of ink spreads in a beaker of water through diffusion. This is because the particles in liquids can move around each other, which means that eventually they are evenly mixed. Diffusion is the process of a substance spreading out to evenly fill its container or environment. In a solution, a concentrated solute diffuses to spread evenly in its solvent. concentration to low concentration.
The temperature at which liquid starts boiling at atmospheric pressure known as –- a)Melting point
- b)Boiling point
- c)Latent heat
- d)Condensation
Correct answer is option 'B'. Can you explain this answer?
The temperature at which liquid starts boiling at atmospheric pressure known as –
a)
Melting point
b)
Boiling point
c)
Latent heat
d)
Condensation
|
Sarita Reddy answered |
Boiling occurs when the vapor pressure reaches or exceeds the surrounding pressure from the atmosphere or whatever else is in contact with the liquid. At standard atmospheric pressure (1 atmosphere = 0.101325 MPa), water boils at approximately 100 degrees Celsius.
Can you explain the answer of this question below:Evaporation causes heating
- A:
True
- B:
False
The answer is B.
Evaporation causes heating
True
False
|
|
Arjun Sharma answered |
When evaporation occurs then than the liquid (mostly water) absorbs all the heat from the surroundings and take it with it and we feel cool. evaporation causes cooling effect because the heat energy is abosorbed by surrounding particles.
A unit of force is- a)Joule – m
- b)Joule
- c). Newton – m
- d) Kg ms−2
Correct answer is option 'D'. Can you explain this answer?
A unit of force is
a)
Joule – m
b)
Joule
c)
. Newton – m
d)
Kg ms−2
|
|
Ananya Das answered |
The SI unit of force is Newton, which is equal to the mass/ acceleration.
Newton =Kg/ms2= Kgms−2.
Newton =Kg/ms2= Kgms−2.
Can you explain the answer of this question below:Pressure on the surface of a gas is increased. What will happen to the inter-particle forces?
- A:
They will remain constant
- B:
They will increase
- C:
They will decreases
- D:
None of these
The answer is b.
Pressure on the surface of a gas is increased. What will happen to the inter-particle forces?
They will remain constant
They will increase
They will decreases
None of these
|
|
Anita Menon answered |
Increase in the pressure on the surface of a gas decreases the volume of the gas with increasing its density. The particles start moving in straight lines and also collide with the wall of the container and this collision enhances the inter particle forces and increases the fluidization behaviour.
Which of the following is known as “physical basis of life”?- a)Nucleolus
- b)Gene
- c)Protoplasm
- d)Mitochondria
Correct answer is 'C'. Can you explain this answer?
Which of the following is known as “physical basis of life”?
a)
Nucleolus
b)
Gene
c)
Protoplasm
d)
Mitochondria
|
Prasenjit Kulkarni answered |
The physical basis of life is protoplasm which contains all the cell organelles present in the cell.
Sulphur dioxide is collected in the lab in a gas jar by upward displacement of air. Which of the following statement is correct regarding the density of the gas?- a)No correct statement can be made about the density of the gas.
- b)It is lighter than air
- c)It is heavier than air
- d)Its density is equal to that of air
Correct answer is option 'C'. Can you explain this answer?
Sulphur dioxide is collected in the lab in a gas jar by upward displacement of air. Which of the following statement is correct regarding the density of the gas?
a)
No correct statement can be made about the density of the gas.
b)
It is lighter than air
c)
It is heavier than air
d)
Its density is equal to that of air
|
|
Amit Sharma answered |
At room temperature, sulfur dioxide is a nonflammable, colorless gas that is heavier than air. Its strong, pungent odor and irritating properties usually provide adequate warning of its presence.
The melting points of two solids [A] and [B] are 300K and 350K respectively. Which has more inter-particles forces?- a)[A]
- b)both have same inter-particles forces
- c)Information not enough.
- d)[B]
Correct answer is option 'D'. Can you explain this answer?
The melting points of two solids [A] and [B] are 300K and 350K respectively. Which has more inter-particles forces?
a)
[A]
b)
both have same inter-particles forces
c)
Information not enough.
d)
[B]
|
|
Ananya Das answered |
With increase in temperature, inter-particles forces decreases. As the melting point of solid A is less than Solid B. Solid B has more inter-particle forces of attraction. Higher the melting point more the inter-particle force.
Match the following with correct response.
(1) Dry ice
(2) Humidity
(3) Temperature
(4) Liquefied gas
(A) Reduce evaporation
(B) Increasing pressure reducing temperature
(C) Increases evaporation
(D) Solid carbon-dioxide- a)1-B, 2-D, 3-A, 4-C
- b)1-C, 2-B, 3-D, 4-A
- c)1-D, 2-A, 3-C, 4-B
- d)1-A, 2-C, 3-B, 4-D
Correct answer is option 'C'. Can you explain this answer?
Match the following with correct response.
(1) Dry ice
(2) Humidity
(3) Temperature
(4) Liquefied gas
(A) Reduce evaporation
(B) Increasing pressure reducing temperature
(C) Increases evaporation
(D) Solid carbon-dioxide
(1) Dry ice
(2) Humidity
(3) Temperature
(4) Liquefied gas
(A) Reduce evaporation
(B) Increasing pressure reducing temperature
(C) Increases evaporation
(D) Solid carbon-dioxide
a)
1-B, 2-D, 3-A, 4-C
b)
1-C, 2-B, 3-D, 4-A
c)
1-D, 2-A, 3-C, 4-B
d)
1-A, 2-C, 3-B, 4-D
|
|
Raghav Bansal answered |
solid carbon dioxide is known as dry ice. The reduced evaporation is called humidity. Evaporation is increased by temperature. The liquefied gas increases pressure and reduces temperature.
Which of the following is a liquid metal-- a)Copper
- b)Mercury
- c)Bromine
- d)Silver
Correct answer is option 'B'. Can you explain this answer?
Which of the following is a liquid metal-
a)
Copper
b)
Mercury
c)
Bromine
d)
Silver
|
Jyoti Kapoor answered |
Mercury
Liquid metal consists of alloys with very low melting points which form a eutectic that is liquid at room temperature. The standard metal used to be mercury, but gallium-based alloys, which are lower both in their vapor pressure at room temperature and toxicity, are being used as a replacement in various applications.
Life span of RBC is- a)50 days
- b)75 days
- c)120 days
- d)100 days
Correct answer is option 'C'. Can you explain this answer?
Life span of RBC is
a)
50 days
b)
75 days
c)
120 days
d)
100 days
|
|
Meera Rana answered |
Life cycle. Human red blood cells are produced through a process named erythropoiesis, developing from committed stem cells to mature red blood cells in about 7 days. When matured, in a healthy individual these cells live in blood circulation for about 100 to 120 days (and 80 to 90 days in a full term infant).
The process for the change of a solid directly into its vapour is called –- a)Evaporation
- b)Ebullition
- c)Condensation
- d)Sublimation
Correct answer is option 'D'. Can you explain this answer?
The process for the change of a solid directly into its vapour is called –
a)
Evaporation
b)
Ebullition
c)
Condensation
d)
Sublimation
|
Sanchita Choudhury answered |
Sublimation is the process through which the solid substance changes directly into vapours or gaseous state without passing through liquid state. Dry ice is a common example of this process.
Convert the temperature of 270 K to the celsius scale –- a)– 3°C
- b)– 4°C
- c)2°C
- d)5°C
Correct answer is option 'A'. Can you explain this answer?
Convert the temperature of 270 K to the celsius scale –
a)
– 3°C
b)
– 4°C
c)
2°C
d)
5°C
|
|
Amit Kumar answered |
We know that °C = K - 273.15
C= K - 273
C= 270 - 273
C = -3
C= 270 - 273
C = -3
Fluids are –- a)Liquids and gases
- b)Solids and gases
- c)Liquids and solids
- d)Only solids
Correct answer is option 'A'. Can you explain this answer?
Fluids are –
a)
Liquids and gases
b)
Solids and gases
c)
Liquids and solids
d)
Only solids
|
|
Arvind Singh answered |
In physics, a fluid is a substance that continually deforms under an applied shear stress. Fluids are a subset of the phases of matter and include liquids, gases, plasmas, and to some extent, plastic solids.
This one is the characteristic of epithelial tissue:- a) Tissues are highly vascularized
- b) These cells never produce glands
- c) The cells will have a rapid rate of cell division
- d) Large intercellular spaces are seen between cells
Correct answer is option 'C'. Can you explain this answer?
This one is the characteristic of epithelial tissue:
a)
Tissues are highly vascularized
b)
These cells never produce glands
c)
The cells will have a rapid rate of cell division
d)
Large intercellular spaces are seen between cells
|
|
Rajeev Chatterjee answered |
Epithelial tissue is one of the four primary types of tissue present in animals. It is composed of tightly packed cells that cover the body surface and line the internal organs, forming a protective barrier. The characteristic of epithelial tissue is as follows:
Rapid Rate of Cell Division
- Epithelial cells have a high rate of cell division, which allows the tissue to regenerate and repair quickly.
- This characteristic is essential for the maintenance and repair of the epithelial tissue.
Other Characteristics of Epithelial Tissue
- Epithelial tissue is avascular, meaning that it lacks blood vessels.
- Epithelial cells are tightly packed and form a continuous sheet, providing a barrier to protect the body from external factors, such as pathogens, chemicals, and physical damage.
- Epithelial tissue has a polarity, meaning that the cells have different structures and functions depending on their location in the tissue.
- Epithelial cells are anchored to a basement membrane, which separates the tissue from the underlying connective tissue.
Functions of Epithelial Tissue
- Epithelial tissue serves various functions, including absorption, secretion, protection, and sensation.
- Different types of epithelial tissue have different structures and functions based on their location in the body.
- For example, the epithelial tissue in the lungs is specialized for gas exchange, while the epithelial tissue in the digestive system is specialized for absorption and secretion.
In conclusion, the characteristic of epithelial tissue is its rapid rate of cell division, which is essential for the maintenance and repair of the tissue. Epithelial tissue also has other characteristics, such as being avascular, forming a continuous sheet, having polarity, and being anchored to a basement membrane. The tissue serves various functions, including absorption, secretion, protection, and sensation, depending on its location in the body.
Rapid Rate of Cell Division
- Epithelial cells have a high rate of cell division, which allows the tissue to regenerate and repair quickly.
- This characteristic is essential for the maintenance and repair of the epithelial tissue.
Other Characteristics of Epithelial Tissue
- Epithelial tissue is avascular, meaning that it lacks blood vessels.
- Epithelial cells are tightly packed and form a continuous sheet, providing a barrier to protect the body from external factors, such as pathogens, chemicals, and physical damage.
- Epithelial tissue has a polarity, meaning that the cells have different structures and functions depending on their location in the tissue.
- Epithelial cells are anchored to a basement membrane, which separates the tissue from the underlying connective tissue.
Functions of Epithelial Tissue
- Epithelial tissue serves various functions, including absorption, secretion, protection, and sensation.
- Different types of epithelial tissue have different structures and functions based on their location in the body.
- For example, the epithelial tissue in the lungs is specialized for gas exchange, while the epithelial tissue in the digestive system is specialized for absorption and secretion.
In conclusion, the characteristic of epithelial tissue is its rapid rate of cell division, which is essential for the maintenance and repair of the tissue. Epithelial tissue also has other characteristics, such as being avascular, forming a continuous sheet, having polarity, and being anchored to a basement membrane. The tissue serves various functions, including absorption, secretion, protection, and sensation, depending on its location in the body.
Which of the following solids undergo sublimation upon heating?- a)Ice
- b)Urea
- c)sugar
- d)Iodine
Correct answer is option 'D'. Can you explain this answer?
Which of the following solids undergo sublimation upon heating?
a)
Ice
b)
Urea
c)
sugar
d)
Iodine
|
|
Hansa Sharma answered |
The process of changing solid directly into gases without changing into liquid is called sublimation. In the substance given above only Iodine is a sublime substance.
Plasma is the.......... state of matter –- a)First
- b)Second
- c)Third
- d)Fourth
Correct answer is option 'D'. Can you explain this answer?
Plasma is the.......... state of matter –
a)
First
b)
Second
c)
Third
d)
Fourth
|
|
Ananya Sharma answered |
A plasma is a hot ionized gas consisting of approximately equal numbers of positively charged ions and negatively charged electrons. The characteristics of plasmas are significantly different from those of ordinary neutral gases so that plasmas are considered a distinct "fourth state of matter."
The smell of hydrogen sulphide (H2S) gas- a)pleasant
- b)of rotten egg
- c)of burning sulphur
- d)None of these
Correct answer is option 'B'. Can you explain this answer?
The smell of hydrogen sulphide (H2S) gas
a)
pleasant
b)
of rotten egg
c)
of burning sulphur
d)
None of these
|
Pooja Shah answered |
Hydrogen sulfide is a flammable, colorless gas with a characteristic odour of rotten eggs. It is commonly known as hydrosulfuric acid, sewer gas, and stink damp. People can smell it at low levels.
Which of the following organelles is smallest in size?- a)Ribosome
- b)Mitochondrial
- c)Chloroplast
- d)Lysosome
Correct answer is option 'A'. Can you explain this answer?
Which of the following organelles is smallest in size?
a)
Ribosome
b)
Mitochondrial
c)
Chloroplast
d)
Lysosome
|
|
Arun Sharma answered |
Ribosomes are primary site of protein synthesis or translation and measure 20 nm.
Lysosomes or "suicidal bags" of the cell measure 200 nm.
Mitochondria, the powerhouse of the cell are site of cellular respiration measures 3000 nm
Chloroplast is the site of photosynthesis and measures 5000 nm.
Therefore, ribosomes are smallest of all.
Lysosomes or "suicidal bags" of the cell measure 200 nm.
Mitochondria, the powerhouse of the cell are site of cellular respiration measures 3000 nm
Chloroplast is the site of photosynthesis and measures 5000 nm.
Therefore, ribosomes are smallest of all.
Ayush hits a cricket ball which than rolls of a level ground after covering a short distance, the ball comes to rest. The ball slows to a stop because- a)There is a force on the ball opposing the motion
- b)Velocity is proportional to the force exerted on the ball.
- c)There is no unbalanced force on the ball so the ball would want to come to rest.
- d)Ayush did not hit the ball hard enough
Correct answer is option 'A'. Can you explain this answer?
Ayush hits a cricket ball which than rolls of a level ground after covering a short distance, the ball comes to rest. The ball slows to a stop because
a)
There is a force on the ball opposing the motion
b)
Velocity is proportional to the force exerted on the ball.
c)
There is no unbalanced force on the ball so the ball would want to come to rest.
d)
Ayush did not hit the ball hard enough
|
|
Amit Kumar answered |
A batsman hits a cricket ball, which then rolls on a level ground. After covering a short distance, the ball comes to rest because there is frictional force on the ball opposing its motion. Frictional force always acts in the direction opposite to the direction of motion.
Hence, this force is responsible for stopping the cricket ball.
So option A is correct answer.
Distance is a __________ quantity- a)vector
- b)name of these
- c)can’t say
- d)scalar
Correct answer is option 'D'. Can you explain this answer?
Distance is a __________ quantity
a)
vector
b)
name of these
c)
can’t say
d)
scalar
|
Jatin Basu answered |
Distance is a scalar quantity that refers to "how much ground an object has covered" during its motion.
What are the characteristics of the particles of matter?
A Particles of matter are in continuous motion
B Particles of matters do not have spaces between them
C Particles of matter attract each other
D Particles of matter are very large in size. - a)(a), (b) and (c) are correct
- b)(a) and (c) are correct
- c)(b) and (c) are correct
- d)All of these
Correct answer is option 'B'. Can you explain this answer?
What are the characteristics of the particles of matter?
A Particles of matter are in continuous motion
B Particles of matters do not have spaces between them
C Particles of matter attract each other
D Particles of matter are very large in size.
A Particles of matter are in continuous motion
B Particles of matters do not have spaces between them
C Particles of matter attract each other
D Particles of matter are very large in size.
a)
(a), (b) and (c) are correct
b)
(a) and (c) are correct
c)
(b) and (c) are correct
d)
All of these
|
|
Vishakha das answered |
The characteristics of particles of matter are as follows:
1. Particles of matter have space between them
When we dissolve salt in water, it is observed that the particles of salt get evenly distributed in water. Also, it is observed that the presence of salt particles did not change the level of water in the beaker. This could be possible only if the particles of salt were accommodated in between the water particles. Thus, this clearly proves that space exists between water particles.
2. Particles of matter are in continuous motion
We know that there is a lot of space present between the particles of matter. Particles of matter are never at rest and keep moving continuously in these free spaces. The particles of matter move continuously and their speed increases with an increase in temperature.
3. Particles of matter attract each other
The particles of matter attract each other. However, this force of attraction varies from matter to matter.
When the liquid starts boiling, the further heat energy which is supplied- a)is lost to the surrounding as such
- b)increases the K.E of the particle in the liquid
- c)Increases the temperature of the liquid.
- d)is absorbed as latent heat of vaporization by the liquid
Correct answer is option 'D'. Can you explain this answer?
When the liquid starts boiling, the further heat energy which is supplied
a)
is lost to the surrounding as such
b)
increases the K.E of the particle in the liquid
c)
Increases the temperature of the liquid.
d)
is absorbed as latent heat of vaporization by the liquid
|
Prerna Desai answered |
When the liquid starts boiling, the further heat energy which is supplied is absorbed as latent heat of vaporization by the liquid to change its state of matter.
A car is moving with uniform speed and covers 100m in 50 second find the speed.- a)2m/s
- b)8m/s
- c)4m/s
- d)1m/s
Correct answer is option 'A'. Can you explain this answer?
A car is moving with uniform speed and covers 100m in 50 second find the speed.
a)
2m/s
b)
8m/s
c)
4m/s
d)
1m/s
|
|
Naina Sharma answered |
SPEED = DISTANCE / TIME
DISTANCE = 100M
TIME = 50 SEC
THEN, SPEED =100M / 50 SEC
SPEED = 2 M / S
DISTANCE = 100M
TIME = 50 SEC
THEN, SPEED =100M / 50 SEC
SPEED = 2 M / S
A substance upon heating directly changes into gaseous state. What is this change called?- a)Melting
- b)Fusion
- c)Sublimation
- d)Condensation
Correct answer is option 'C'. Can you explain this answer?
A substance upon heating directly changes into gaseous state. What is this change called?
a)
Melting
b)
Fusion
c)
Sublimation
d)
Condensation
|
|
Neeti Gupta answered |
Sublimation
Sublimation is the process in which a substance directly changes from a solid to a gaseous state without passing through the liquid phase. This change occurs when the substance is heated to a temperature at which its vapor pressure exceeds the atmospheric pressure. Sublimation is an endothermic process, meaning that it requires energy in the form of heat to occur.
Examples of Sublimation:
1. Dry ice - When dry ice, which is solid carbon dioxide, is heated it directly changes into carbon dioxide gas without melting into a liquid.
2. Camphor - When camphor is heated, it directly changes into a gaseous state without melting.
3. Naphthalene balls - Naphthalene balls used for moth control also undergo sublimation on heating.
Uses of Sublimation:
1. Sublimation is used in the purification of substances. For example, when impure solid iodine is heated, it directly changes into iodine vapor, which can be collected and condensed into pure solid iodine.
2. Sublimation is used in the production of certain chemicals, such as in the production of semiconductor materials.
3. Sublimation is also used in the manufacturing of dry ice, which is used in refrigeration and transportation of food and medical products.
Conclusion:
Sublimation is a process in which a substance directly changes from a solid to a gaseous state without passing through the liquid phase. It is an important process with various industrial and scientific applications.
Sublimation is the process in which a substance directly changes from a solid to a gaseous state without passing through the liquid phase. This change occurs when the substance is heated to a temperature at which its vapor pressure exceeds the atmospheric pressure. Sublimation is an endothermic process, meaning that it requires energy in the form of heat to occur.
Examples of Sublimation:
1. Dry ice - When dry ice, which is solid carbon dioxide, is heated it directly changes into carbon dioxide gas without melting into a liquid.
2. Camphor - When camphor is heated, it directly changes into a gaseous state without melting.
3. Naphthalene balls - Naphthalene balls used for moth control also undergo sublimation on heating.
Uses of Sublimation:
1. Sublimation is used in the purification of substances. For example, when impure solid iodine is heated, it directly changes into iodine vapor, which can be collected and condensed into pure solid iodine.
2. Sublimation is used in the production of certain chemicals, such as in the production of semiconductor materials.
3. Sublimation is also used in the manufacturing of dry ice, which is used in refrigeration and transportation of food and medical products.
Conclusion:
Sublimation is a process in which a substance directly changes from a solid to a gaseous state without passing through the liquid phase. It is an important process with various industrial and scientific applications.
On a velocity-time graph, a horizontal straight line corresponds to motion at- a)constant velocity
- b)zero velocity
- c)increasing velocity
- d)decreasing velocity
Correct answer is option 'A'. Can you explain this answer?
On a velocity-time graph, a horizontal straight line corresponds to motion at
a)
constant velocity
b)
zero velocity
c)
increasing velocity
d)
decreasing velocity
|
|
Arun Sharma answered |
It is horizontal so, angle is zero and also acceleration is zero. Hence constant velocity.
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