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All questions of CTET Practice Test (Science) for CTET & State TET Exam
When pressure is increased, the melting point of ice - - a)Increases
- b)Does not change
- c)Decreases
- d)Depends on the impurities in the ice
Correct answer is option 'C'. Can you explain this answer?
When pressure is increased, the melting point of ice -
a)
Increases
b)
Does not change
c)
Decreases
d)
Depends on the impurities in the ice
|
Amrutha Roy answered |
When pressure is increased, the melting point of ice decreases.
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A dynamo which is said to generate electricity actually acts as a - a)Source of ions
- b)Source of electric charge
- c)Converter of energy
- d)Source of electrons
Correct answer is option 'C'. Can you explain this answer?
A dynamo which is said to generate electricity actually acts as a
a)
Source of ions
b)
Source of electric charge
c)
Converter of energy
d)
Source of electrons
|
Nishanth Nambiar answered |
A dynamo, which is also known as an electrical generator produces direct current through a commutator. It is basically a device which converts mechanical rotation into electric current according to Faraday’s law.
___________ gives hardness to stainless steel. - a)Zinc
- b)Lead
- c)Carbon
- d)Tin
Correct answer is option 'C'. Can you explain this answer?
___________ gives hardness to stainless steel.
a)
Zinc
b)
Lead
c)
Carbon
d)
Tin
|
Yash Malik answered |
Carbon gives hardness to Stainless Steel.
Flat footed camels can walk easily in sandy deserts because - - a)pressure on the sand is decreased by increasing the area of the surface in contact
- b)pressure on the sand is increased by increasing the area of the surface in contact
- c)pressure on the sand is decreased by decreasing the area of the surface in contact
- d)pressure on the sand is increased by decreasing the area of the surface in contact
Correct answer is option 'A'. Can you explain this answer?
Flat footed camels can walk easily in sandy deserts because -
a)
pressure on the sand is decreased by increasing the area of the surface in contact
b)
pressure on the sand is increased by increasing the area of the surface in contact
c)
pressure on the sand is decreased by decreasing the area of the surface in contact
d)
pressure on the sand is increased by decreasing the area of the surface in contact
|
Deepika Yadav answered |
Answer:
Flat-footed camels are well-adapted to walking easily in sandy deserts. This is because the structure of their feet helps to distribute their weight over a larger surface area, reducing the pressure on the sand beneath them.
When an object, such as the foot of an animal, exerts force on the sand, it creates pressure. Pressure is defined as force divided by the area over which the force is applied. In the case of flat-footed camels, the force exerted by their feet is distributed over a larger area, resulting in a lower pressure on the sand compared to animals with smaller feet.
The flat shape of a camel's foot increases the area of the surface in contact with the sand. This means that the force exerted by the foot is spread out over a larger area, resulting in a decrease in pressure. This is beneficial for camels walking in sandy deserts because it allows them to traverse the sand more easily.
There are several advantages to having a larger surface area in contact with the sand, resulting in decreased pressure:
1. Reduced sinking: By distributing their weight more evenly, flat-footed camels are less likely to sink into the sand. This helps them to maintain stability and move more efficiently.
2. Increased traction: The larger surface area of their feet allows camels to have better traction on loose sand. This helps them to prevent slipping and sliding as they walk.
3. Less energy expenditure: Walking on sand requires more energy compared to walking on solid ground. By reducing the pressure on the sand, camels can conserve energy and minimize fatigue.
4. Prevention of injury: The decreased pressure on the sand reduces the likelihood of injury to the camel's feet. The sand acts as a cushion, absorbing some of the impact and protecting the feet from damage.
Overall, the adaptation of flat-footed camels to sandy desert environments is an excellent example of how natural selection has favored traits that enhance their ability to survive and thrive in challenging conditions.
Introduction
Flat-footed camels are well-adapted to walking easily in sandy deserts. This is because the structure of their feet helps to distribute their weight over a larger surface area, reducing the pressure on the sand beneath them.
Pressure on the sand
When an object, such as the foot of an animal, exerts force on the sand, it creates pressure. Pressure is defined as force divided by the area over which the force is applied. In the case of flat-footed camels, the force exerted by their feet is distributed over a larger area, resulting in a lower pressure on the sand compared to animals with smaller feet.
Increasing the area of the surface in contact
The flat shape of a camel's foot increases the area of the surface in contact with the sand. This means that the force exerted by the foot is spread out over a larger area, resulting in a decrease in pressure. This is beneficial for camels walking in sandy deserts because it allows them to traverse the sand more easily.
Advantages of decreased pressure
There are several advantages to having a larger surface area in contact with the sand, resulting in decreased pressure:
1. Reduced sinking: By distributing their weight more evenly, flat-footed camels are less likely to sink into the sand. This helps them to maintain stability and move more efficiently.
2. Increased traction: The larger surface area of their feet allows camels to have better traction on loose sand. This helps them to prevent slipping and sliding as they walk.
3. Less energy expenditure: Walking on sand requires more energy compared to walking on solid ground. By reducing the pressure on the sand, camels can conserve energy and minimize fatigue.
4. Prevention of injury: The decreased pressure on the sand reduces the likelihood of injury to the camel's feet. The sand acts as a cushion, absorbing some of the impact and protecting the feet from damage.
Overall, the adaptation of flat-footed camels to sandy desert environments is an excellent example of how natural selection has favored traits that enhance their ability to survive and thrive in challenging conditions.
Static science is associated with- - a)Dynamic situation
- b)Situation of rest
- c)Mental situation
- d)Data analyzing
Correct answer is option 'B'. Can you explain this answer?
Static science is associated with-
a)
Dynamic situation
b)
Situation of rest
c)
Mental situation
d)
Data analyzing
|
Prisha Saha answered |
Statics is a branch of mechanics associated with the situation or rest.
A transformer - - a)converts DC to AC
- b)is used to decrease or increase AC voltage
- c)converts AC voltage to DC voltage
- d)converts electrical energy into mechanical energy
Correct answer is option 'B'. Can you explain this answer?
A transformer -
a)
converts DC to AC
b)
is used to decrease or increase AC voltage
c)
converts AC voltage to DC voltage
d)
converts electrical energy into mechanical energy
|
|
Nishanth Nambiar answered |
A transformer is used to bring voltage up or down in an AC electrical circuit.
Chernobyl disaster is the result of pollution by_____________. - a)Oil spill
- b)Acid rain
- c)Carbon dioxide
- d)Radioactive waste
Correct answer is option 'D'. Can you explain this answer?
Chernobyl disaster is the result of pollution by_____________.
a)
Oil spill
b)
Acid rain
c)
Carbon dioxide
d)
Radioactive waste
|
|
Shail Sen answered |
Chernobyl disaster is the result of pollution by radioactive wastes. Which occurred on 26 April 1986 in Ukranian Soviet Socialist Republic which was part of Soviet Union.
Which of the following types of light are strongly absorbed by plants? - a)Violet and orange
- b)Blue and red
- c)Indigo and yellow
- d)Yellow and violet
Correct answer is option 'B'. Can you explain this answer?
Which of the following types of light are strongly absorbed by plants?
a)
Violet and orange
b)
Blue and red
c)
Indigo and yellow
d)
Yellow and violet
|
Dishani Chakraborty answered |
Plants use only certain colours from light for the process of photosynthesis. The chlorophyll absorbs blue, red and violet light rays. Photosynthesis occurs more in blue and red light rays and less or not all in green light rays.
The chemical used for destroying fungi in water tanks is - - a)Copper Sulphate
- b)Magnesium Sulphate
- c)Zinc Sulphate
- d)Nitric Acid
Correct answer is option 'A'. Can you explain this answer?
The chemical used for destroying fungi in water tanks is -
a)
Copper Sulphate
b)
Magnesium Sulphate
c)
Zinc Sulphate
d)
Nitric Acid
|
|
Mehul Menon answered |
Copper Sulphate is a fungicide used to control bacterial and fungal diseases of fruit, vegetable, nut and field crops. It is chemical used for destroying fungi in water tanks.
Which of the following is correct about cold-blooded animals? - a)Their blood remains cold all the time
- b)Their body temperature changes in accordance with atmosphere
- c)Their body temperature remains constant all the time
- d)They kill all the animals they came across
Correct answer is option 'B'. Can you explain this answer?
Which of the following is correct about cold-blooded animals?
a)
Their blood remains cold all the time
b)
Their body temperature changes in accordance with atmosphere
c)
Their body temperature remains constant all the time
d)
They kill all the animals they came across
|
|
Anand Desai answered |
Cold-blooded creatures take on the temperature of their surroundings. They are hot when their environment is hot and cold when their environment is cold. In hot environments, cold-blooded animals can have blood that is much warmer than warm-blooded animals so thier body temperature changes in accordance to temperature of atmosphere.
A sudden fall in barometer reading indicates that the weather will be: - a)Stormy weather
- b)Rainy weather
- c)Cool dry weather
- d)Hot and humid weather
Correct answer is option 'A'. Can you explain this answer?
A sudden fall in barometer reading indicates that the weather will be:
a)
Stormy weather
b)
Rainy weather
c)
Cool dry weather
d)
Hot and humid weather
|
|
Ameya Desai answered |
Explanation:
A barometer is an instrument that measures atmospheric pressure. Sudden fall in barometer reading indicates that the atmospheric pressure is falling rapidly. This, in turn, indicates a change in weather conditions.
Stormy weather:
A sudden fall in barometer reading is a clear indication of an approaching storm. The sudden drop in atmospheric pressure is an indication of the movement of low-pressure areas. When low-pressure areas move in, it is usually followed by stormy or unsettled weather.
Rainy weather:
While a sudden fall in barometer reading may indicate an approaching storm, it may also indicate that rain is on the way. Low-pressure systems often bring with them cloudy and rainy weather.
Cool dry weather:
A sudden fall in barometer reading is usually not associated with cool and dry weather. In fact, a sudden fall in atmospheric pressure is often an indication of warm, moist air moving in.
Hot and humid weather:
A sudden fall in barometer reading may be an indication of hot and humid weather. Warm, moist air is often associated with low-pressure systems. This can result in hot and humid weather conditions.
Conclusion:
In conclusion, a sudden fall in barometer reading is an indication of changing weather conditions. While it can indicate a number of weather conditions, including rain, hot and humid weather, and stormy weather, it is most commonly associated with approaching storms and unsettled weather.
A barometer is an instrument that measures atmospheric pressure. Sudden fall in barometer reading indicates that the atmospheric pressure is falling rapidly. This, in turn, indicates a change in weather conditions.
Stormy weather:
A sudden fall in barometer reading is a clear indication of an approaching storm. The sudden drop in atmospheric pressure is an indication of the movement of low-pressure areas. When low-pressure areas move in, it is usually followed by stormy or unsettled weather.
Rainy weather:
While a sudden fall in barometer reading may indicate an approaching storm, it may also indicate that rain is on the way. Low-pressure systems often bring with them cloudy and rainy weather.
Cool dry weather:
A sudden fall in barometer reading is usually not associated with cool and dry weather. In fact, a sudden fall in atmospheric pressure is often an indication of warm, moist air moving in.
Hot and humid weather:
A sudden fall in barometer reading may be an indication of hot and humid weather. Warm, moist air is often associated with low-pressure systems. This can result in hot and humid weather conditions.
Conclusion:
In conclusion, a sudden fall in barometer reading is an indication of changing weather conditions. While it can indicate a number of weather conditions, including rain, hot and humid weather, and stormy weather, it is most commonly associated with approaching storms and unsettled weather.
Anions are formed by _____. - a)losing of electrons
- b)gaining of electrons
- c)gaining of neutrons
- d)losing of neutrons
Correct answer is option 'B'. Can you explain this answer?
Anions are formed by _____.
a)
losing of electrons
b)
gaining of electrons
c)
gaining of neutrons
d)
losing of neutrons
|
Aarav Mehra answered |
Anions are atoms or radicals (groups of atoms), that have gained electrons. Since they now have more electrons than protons, anions have a negative charge. For example,Chloride ions Cl- , Bromide Br- , Iodide I-.
Which of the following is the main end product of carbohydrate digestion? - a)Fats
- b)Lipids
- c)Glucose
- d)Cellulose
Correct answer is option 'C'. Can you explain this answer?
Which of the following is the main end product of carbohydrate digestion?
a)
Fats
b)
Lipids
c)
Glucose
d)
Cellulose
|
Anagha Mishra answered |
Carbohydrate digestion and the main end product
Carbohydrate digestion is the process by which complex carbohydrates are broken down into simpler forms that can be absorbed and utilized by the body. The main end product of carbohydrate digestion is glucose.
Process of carbohydrate digestion
Carbohydrate digestion begins in the mouth with the action of salivary amylase, an enzyme that breaks down starch into smaller polysaccharides and disaccharides. However, this step is limited as the food spends only a short time in the mouth.
The majority of carbohydrate digestion takes place in the small intestine. The partially digested carbohydrates from the mouth enter the small intestine, where pancreatic amylase is secreted. Pancreatic amylase further breaks down the complex carbohydrates into maltose, a disaccharide consisting of two glucose molecules.
Enzymes involved in carbohydrate digestion
- Salivary amylase: Secreted in the mouth, it begins the breakdown of starch into smaller polysaccharides and disaccharides.
- Pancreatic amylase: Secreted by the pancreas into the small intestine, it breaks down complex carbohydrates into disaccharides.
Conversion of disaccharides to monosaccharides
The disaccharides produced during carbohydrate digestion, such as maltose, sucrose, and lactose, need to be further broken down into monosaccharides before they can be absorbed into the bloodstream. This occurs in the brush border of the small intestine, where specific enzymes are present:
- Maltase: Breaks down maltose into two glucose molecules.
- Sucrase: Breaks down sucrose into one glucose molecule and one fructose molecule.
- Lactase: Breaks down lactose into one glucose molecule and one galactose molecule.
Glucose as the main end product
Glucose is a monosaccharide and the primary source of energy for the body. Once the carbohydrates are broken down into glucose molecules, they can be absorbed through the intestinal lining and enter the bloodstream. From there, glucose can be transported to cells throughout the body, where it is used for energy production.
Conclusion
In summary, the main end product of carbohydrate digestion is glucose. Complex carbohydrates are broken down into simpler forms, such as disaccharides and monosaccharides, through the action of enzymes. The disaccharides are further broken down into monosaccharides, primarily glucose, which can be absorbed and utilized by the body for energy.
Carbohydrate digestion is the process by which complex carbohydrates are broken down into simpler forms that can be absorbed and utilized by the body. The main end product of carbohydrate digestion is glucose.
Process of carbohydrate digestion
Carbohydrate digestion begins in the mouth with the action of salivary amylase, an enzyme that breaks down starch into smaller polysaccharides and disaccharides. However, this step is limited as the food spends only a short time in the mouth.
The majority of carbohydrate digestion takes place in the small intestine. The partially digested carbohydrates from the mouth enter the small intestine, where pancreatic amylase is secreted. Pancreatic amylase further breaks down the complex carbohydrates into maltose, a disaccharide consisting of two glucose molecules.
Enzymes involved in carbohydrate digestion
- Salivary amylase: Secreted in the mouth, it begins the breakdown of starch into smaller polysaccharides and disaccharides.
- Pancreatic amylase: Secreted by the pancreas into the small intestine, it breaks down complex carbohydrates into disaccharides.
Conversion of disaccharides to monosaccharides
The disaccharides produced during carbohydrate digestion, such as maltose, sucrose, and lactose, need to be further broken down into monosaccharides before they can be absorbed into the bloodstream. This occurs in the brush border of the small intestine, where specific enzymes are present:
- Maltase: Breaks down maltose into two glucose molecules.
- Sucrase: Breaks down sucrose into one glucose molecule and one fructose molecule.
- Lactase: Breaks down lactose into one glucose molecule and one galactose molecule.
Glucose as the main end product
Glucose is a monosaccharide and the primary source of energy for the body. Once the carbohydrates are broken down into glucose molecules, they can be absorbed through the intestinal lining and enter the bloodstream. From there, glucose can be transported to cells throughout the body, where it is used for energy production.
Conclusion
In summary, the main end product of carbohydrate digestion is glucose. Complex carbohydrates are broken down into simpler forms, such as disaccharides and monosaccharides, through the action of enzymes. The disaccharides are further broken down into monosaccharides, primarily glucose, which can be absorbed and utilized by the body for energy.
Delonix regia Rafin is the scientific name of - - a)Banyan
- b)Gulmohar
- c)Tamarind
- d)Chiku
Correct answer is option 'B'. Can you explain this answer?
Delonix regia Rafin is the scientific name of -
a)
Banyan
b)
Gulmohar
c)
Tamarind
d)
Chiku
|
|
Krithika Chakraborty answered |
Delonix regia Rafin is the scientific name of Gulmohar.
Mitochondria was discovered by - - a)Weismann
- b)Darwin
- c)Lamarck
- d)Richard Altamann
Correct answer is option 'D'. Can you explain this answer?
Mitochondria was discovered by -
a)
Weismann
b)
Darwin
c)
Lamarck
d)
Richard Altamann
|
Sravya Desai answered |
Richard Altamann discovered Mitochondria.
The pH of human blood is between - - a)6.5–7
- b)7.35–7.45
- c)8–9
- d)4.5–5
Correct answer is option 'B'. Can you explain this answer?
The pH of human blood is between -
a)
6.5–7
b)
7.35–7.45
c)
8–9
d)
4.5–5
|
|
Roshni Bajaj answered |
The pH of human blood is between 7.35 to 7.45.
Isotope 14C6is associated with- - a)For cancer diagnosis
- b)Determining the age of the earth
- c)Determining the age of fossil
- d)For traler technology
Correct answer is option 'C'. Can you explain this answer?
Isotope 14C6is associated with-
a)
For cancer diagnosis
b)
Determining the age of the earth
c)
Determining the age of fossil
d)
For traler technology
|
|
Ameya Jain answered |
This theory was given by Willard Frank Libby in 1949. To determine the age of wood and bones (the time which elapsed after the death of plant) is called Ratio Carbon Dating. The Half-life of Carbon 14 is 5,730 + 40 years.
Which among the following elements has highest Electronegativity? - a)Gallium
- b)Sodium
- c)Arsenic
- d)Caesium
Correct answer is option 'C'. Can you explain this answer?
Which among the following elements has highest Electronegativity?
a)
Gallium
b)
Sodium
c)
Arsenic
d)
Caesium
|
|
Shail Sen answered |
Arsenic has highest electronegativity in the given elements.
Which of the following is not a donor atom? - a)Phosphorus
- b)Antimony
- c)Arsenic
- d)Aluminium
Correct answer is option 'D'. Can you explain this answer?
Which of the following is not a donor atom?
a)
Phosphorus
b)
Antimony
c)
Arsenic
d)
Aluminium
|
|
Advait Datta answered |
Explanation:
To understand why aluminum (Al) is not a donor atom, we need to have a basic understanding of donor atoms and their characteristics.
Donor Atoms:
Donor atoms are atoms that have an excess of electrons in their outermost energy level and can easily donate these electrons to form chemical bonds. This property allows them to act as electron donors in chemical reactions, especially in the formation of coordinate bonds.
Properties of Donor Atoms:
1. Donor atoms have one or more lone pairs of electrons.
2. They are usually found in groups 15, 16, and 17 of the periodic table.
3. Donor atoms typically have a high electronegativity, which means they have a strong attraction for electrons.
4. They can easily form coordinate covalent bonds by donating their lone pair of electrons to an electron-deficient atom or ion.
Analysis of Options:
a) Phosphorus (P): Phosphorus is a group 15 element and has the electronic configuration 1s2 2s2 2p6 3s2 3p3. It has three lone pairs of electrons and can readily donate these electrons to form coordinate bonds. Therefore, phosphorus is a donor atom.
b) Antimony (Sb): Antimony is also a group 15 element and has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3. It has three lone pairs of electrons and can act as a donor atom.
c) Arsenic (As): Arsenic belongs to group 15 and has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3. It has three lone pairs of electrons and can act as a donor atom.
d) Aluminum (Al): Aluminum belongs to group 13 and has the electronic configuration 1s2 2s2 2p6 3s2 3p1. It has only one lone pair of electrons, which is not easily accessible for donation. Therefore, aluminum is not a donor atom.
Conclusion:
Based on the analysis above, the correct answer is option D, Aluminum (Al), as it does not possess the characteristics of a donor atom.
To understand why aluminum (Al) is not a donor atom, we need to have a basic understanding of donor atoms and their characteristics.
Donor Atoms:
Donor atoms are atoms that have an excess of electrons in their outermost energy level and can easily donate these electrons to form chemical bonds. This property allows them to act as electron donors in chemical reactions, especially in the formation of coordinate bonds.
Properties of Donor Atoms:
1. Donor atoms have one or more lone pairs of electrons.
2. They are usually found in groups 15, 16, and 17 of the periodic table.
3. Donor atoms typically have a high electronegativity, which means they have a strong attraction for electrons.
4. They can easily form coordinate covalent bonds by donating their lone pair of electrons to an electron-deficient atom or ion.
Analysis of Options:
a) Phosphorus (P): Phosphorus is a group 15 element and has the electronic configuration 1s2 2s2 2p6 3s2 3p3. It has three lone pairs of electrons and can readily donate these electrons to form coordinate bonds. Therefore, phosphorus is a donor atom.
b) Antimony (Sb): Antimony is also a group 15 element and has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3. It has three lone pairs of electrons and can act as a donor atom.
c) Arsenic (As): Arsenic belongs to group 15 and has the electronic configuration 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3. It has three lone pairs of electrons and can act as a donor atom.
d) Aluminum (Al): Aluminum belongs to group 13 and has the electronic configuration 1s2 2s2 2p6 3s2 3p1. It has only one lone pair of electrons, which is not easily accessible for donation. Therefore, aluminum is not a donor atom.
Conclusion:
Based on the analysis above, the correct answer is option D, Aluminum (Al), as it does not possess the characteristics of a donor atom.
Which drug is used as an Antidepressant? - a)Oxybutynin
- b)Tramadol
- c)Sumatriptan
- d)Bupropion
Correct answer is option 'D'. Can you explain this answer?
Which drug is used as an Antidepressant?
a)
Oxybutynin
b)
Tramadol
c)
Sumatriptan
d)
Bupropion
|
|
Rashi Ahuja answered |
Bupropion is used to treat major depressive disorder and to help people stop smoking.
Which one of the following is the unit of measure of the thickness of the ozone layer of the atmosphere? - a)Knot
- b)Dobson
- c)Poise
- d)Maxwell
Correct answer is option 'B'. Can you explain this answer?
Which one of the following is the unit of measure of the thickness of the ozone layer of the atmosphere?
a)
Knot
b)
Dobson
c)
Poise
d)
Maxwell
|
|
Aarav Chakraborty answered |
Ozone layer thickness is expressed in terms of Dobson units, which measure, what its physical thickness would be if compressed in the earth’s atmosphere. 1 Dobson unit is defined to be 0.01 mm thickness STP (Standard Temperature and Pressure).
The gas used to inflate the tyres of an aircraft is- - a)Hydrogen
- b)Nitrogen
- c)Helium
- d)Neon
Correct answer is option 'B'. Can you explain this answer?
The gas used to inflate the tyres of an aircraft is-
a)
Hydrogen
b)
Nitrogen
c)
Helium
d)
Neon
|
|
Vandana Tiwari answered |
Nitrogen gas is used in the tyres of an aeroplane. This is because the nitrogen gas does not support combustion and can assist in preventing wheel fire when the aircraft lands .
The colour of the star is an indication of its: - a)Distance from the earth
- b)Temperature
- c)Luminosity
- d)Distance from the sun
Correct answer is option 'B'. Can you explain this answer?
The colour of the star is an indication of its:
a)
Distance from the earth
b)
Temperature
c)
Luminosity
d)
Distance from the sun
|
|
Nabanita Tiwari answered |
The colour of the stars reflects the age of stars. Colour is reflected from the temperature is high, then the star is young. The star will be blue during young stage which indicates high temperature. If star is red the temperature is low.
The nature of fuse wire is - - a)Low melting point
- b)High melting point
- c)High conductivity
- d)None of these
Correct answer is option 'A'. Can you explain this answer?
The nature of fuse wire is -
a)
Low melting point
b)
High melting point
c)
High conductivity
d)
None of these
|
|
Ameya Desai answered |
Electric fuse is a protective device which protects electrical equipment in the circuit by breaking the circuit when there is a short circuit.It has low melting point.
Which of the following gases is heavier than oxygen? - a)Carbon dioxide
- b)Ammonia
- c)Methane
- d)Helium
Correct answer is option 'A'. Can you explain this answer?
Which of the following gases is heavier than oxygen?
a)
Carbon dioxide
b)
Ammonia
c)
Methane
d)
Helium
|
|
Roshni Bajaj answered |
For oxygen, a molecule consists of two oxygen atoms, and has a weight of 2 x 16 = 32. For carbon dioxide, there is one carbon atom (weight 12) and two oxygen atoms (mass 16 x 2) for a total of 44. This means that carbon dioxide should be about 44/32 = 1.375 times (ideally) as heavy as an equivalent volume of oxygen. In reality, carbon dioxide is 1.383 times as heavy as oxygen.Even after solidification carbon di oxide is slightly heavier than similar volume of solid oxygen.
Of how many carats is the pure gold? - a)22
- b)24
- c)28
- d)20
Correct answer is option 'B'. Can you explain this answer?
Of how many carats is the pure gold?
a)
22
b)
24
c)
28
d)
20
|
Upasana Kumar answered |
It is an extension of the older carat (Karat in North American spelling) system of denoting the purity of gold by fractions of 24, such as ’18 carat’ for an alloy with 75% (18 parts per 24) pure gold by mass.
Soil having high content of aluminum and iron oxide is also known as _____. - a)Meadow soil
- b)Pedalfer soil
- c)Chernozen soil
- d)Podzol soil
Correct answer is option 'B'. Can you explain this answer?
Soil having high content of aluminum and iron oxide is also known as _____.
a)
Meadow soil
b)
Pedalfer soil
c)
Chernozen soil
d)
Podzol soil
|
|
Varun Ghosh answered |
Pedalfer is composed of high amount of aluminum and iron oxides. It is a subdivision of the zonal soil order comprising a large group of soils in which sesquioxides increase relative to silica during soil formation. Pedalfers usually occur in humid areas.
Oil spreads on water surface because- - a)Oil is denser than water
- b)Oil is less dense than water
- c)Surface tension of oil is more than water
- d)Surface tension of oil is less than water
Correct answer is option 'D'. Can you explain this answer?
Oil spreads on water surface because-
a)
Oil is denser than water
b)
Oil is less dense than water
c)
Surface tension of oil is more than water
d)
Surface tension of oil is less than water
|
|
Aarav Chakraborty answered |
Oil spreads on water surface because the surface tension of oil is less than water.
How many chromosomes are there in humans? - a)36
- b)46
- c)56
- d)26
Correct answer is option 'B'. Can you explain this answer?
How many chromosomes are there in humans?
a)
36
b)
46
c)
56
d)
26
|
|
Hridoy Joshi answered |
In humans, each cell normally contains 23 pairs of chromosomes, a total of 46.
The change of focal length of an eye lense is caused by action of the - a)Pupil
- b)Retina
- c)Ciliary muscles
- d)Iris
Correct answer is option 'C'. Can you explain this answer?
The change of focal length of an eye lense is caused by action of the
a)
Pupil
b)
Retina
c)
Ciliary muscles
d)
Iris
|
|
Mehul Das answered |
The change of focal length of an eye lens is caused by the action of the ciliary muscles.
Explanation:
The eye consists of various structures that work together to enable vision. The lens of the eye is responsible for focusing light onto the retina, which then sends signals to the brain for image processing. The ability to change the focal length of the lens is crucial for clear vision at different distances.
Role of the Ciliary Muscles:
The ciliary muscles are located in the ciliary body, which is a ring-shaped structure behind the iris. These muscles play a significant role in adjusting the shape and curvature of the lens, thereby altering its focal length. When the ciliary muscles contract, they exert a pulling force on the lens, causing it to become more rounded and increasing its refractive power. This allows the eye to focus on nearby objects.
Process of Accommodation:
The adjustment of the lens to focus on objects at different distances is called accommodation. When we look at distant objects, the ciliary muscles are relaxed, and the lens is flattened. This reduces its refractive power, making it easier to focus on distant objects. However, when we shift our focus to a nearby object, the ciliary muscles contract, causing the lens to become thicker and more curved. This increases its refractive power, enabling clear vision of nearby objects.
Importance of Ciliary Muscle Action:
The action of the ciliary muscles is crucial for maintaining clear vision at different distances. Without the ability to change the shape of the lens, the eye would have a fixed focal length and would only be able to focus on objects at a specific distance. The action of the ciliary muscles allows the eye to dynamically adjust its focal length, providing clear vision at various distances.
In summary, the ciliary muscles are responsible for changing the shape and curvature of the lens, which in turn alters its focal length. This adjustment, known as accommodation, allows the eye to focus on objects at different distances, providing clear vision.
Explanation:
The eye consists of various structures that work together to enable vision. The lens of the eye is responsible for focusing light onto the retina, which then sends signals to the brain for image processing. The ability to change the focal length of the lens is crucial for clear vision at different distances.
Role of the Ciliary Muscles:
The ciliary muscles are located in the ciliary body, which is a ring-shaped structure behind the iris. These muscles play a significant role in adjusting the shape and curvature of the lens, thereby altering its focal length. When the ciliary muscles contract, they exert a pulling force on the lens, causing it to become more rounded and increasing its refractive power. This allows the eye to focus on nearby objects.
Process of Accommodation:
The adjustment of the lens to focus on objects at different distances is called accommodation. When we look at distant objects, the ciliary muscles are relaxed, and the lens is flattened. This reduces its refractive power, making it easier to focus on distant objects. However, when we shift our focus to a nearby object, the ciliary muscles contract, causing the lens to become thicker and more curved. This increases its refractive power, enabling clear vision of nearby objects.
Importance of Ciliary Muscle Action:
The action of the ciliary muscles is crucial for maintaining clear vision at different distances. Without the ability to change the shape of the lens, the eye would have a fixed focal length and would only be able to focus on objects at a specific distance. The action of the ciliary muscles allows the eye to dynamically adjust its focal length, providing clear vision at various distances.
In summary, the ciliary muscles are responsible for changing the shape and curvature of the lens, which in turn alters its focal length. This adjustment, known as accommodation, allows the eye to focus on objects at different distances, providing clear vision.
Which of the following is a Synthetic rubber? - a)Leoprene
- b)Monoprene
- c)Neoprene
- d)Isoprene
Correct answer is option 'C'. Can you explain this answer?
Which of the following is a Synthetic rubber?
a)
Leoprene
b)
Monoprene
c)
Neoprene
d)
Isoprene
|
Prateek Ghosh answered |
Neoprene is a family of synthetic rubbers that are produced by polymerization of chloroprene. Neoprene exhibits good chemical stability and maintains flexibility over a wide temperature range.
Genome mapping relates to: - a)Blood grouping
- b)Mapping of genes
- c)Mapping of nerve centers
- d)Mapping of brain
Correct answer is option 'B'. Can you explain this answer?
Genome mapping relates to:
a)
Blood grouping
b)
Mapping of genes
c)
Mapping of nerve centers
d)
Mapping of brain
|
|
Sravya Nambiar answered |
Gene mapping is the method used for determining the location of gene and relative distances between genes on a chromosome. The essence of all genome mapping is to place a collection of molecular markers onto their respective positions on the genome. Molecular markers come in all forms. Genes can be viewed as one special type of genetic markers in the construction of genome maps and mapped the same way as any other markers.
Animals living in the tree trunks are known as - - a)Arboreal
- b)Volant
- c)Amphibious
- d)Aquatics
Correct answer is option 'A'. Can you explain this answer?
Animals living in the tree trunks are known as -
a)
Arboreal
b)
Volant
c)
Amphibious
d)
Aquatics
|
|
Aaditya Joshi answered |
Arboreal is defined as something having the evolutionary characteristics of animals which allow them to live or maneuver through trees. An example of an arboreal part of the chimpanzee's anatomy is its long arms.
Desert plants have longer root system because: - a)High temperature of the soil stimulates the growth of roots
- b)Roots grow in search of water
- c)Soil does not contain water, hence becomes compact and presses the roots to grow longer
- d)Roots moves opposite to the solar heat
Correct answer is option 'B'. Can you explain this answer?
Desert plants have longer root system because:
a)
High temperature of the soil stimulates the growth of roots
b)
Roots grow in search of water
c)
Soil does not contain water, hence becomes compact and presses the roots to grow longer
d)
Roots moves opposite to the solar heat
|
|
Harsh Kapoor answered |
Cactus, calotropis, aloe, etc. are desert plants which have the capability to complete their life-cycle even in a dry atmosphere. The root system of these plants become taller in search of water from the soil and their stems are small, adapted and underground sometimes.
Which is the largest organ in human beings? - a)Skin
- b)Large Intestine
- c)Small Intestine
- d)Liver
Correct answer is option 'A'. Can you explain this answer?
Which is the largest organ in human beings?
a)
Skin
b)
Large Intestine
c)
Small Intestine
d)
Liver
|
Mira Basu answered |
Understanding the Largest Organ: Skin
The human body consists of various organs, each playing a unique role in maintaining overall health. Among these, the skin stands out as the largest organ.
What Makes Skin the Largest Organ?
- Surface Area: The skin covers an average area of about 1.5 to 2 square meters in adults.
- Weight: In adults, the skin typically weighs between 3 to 4 kilograms, contributing significantly to the overall body weight.
Functions of the Skin
- Protection: Acts as a barrier against pathogens, chemicals, and physical injuries.
- Regulation: Helps regulate body temperature through sweating and blood flow.
- Sensation: Contains nerve endings that provide the sense of touch, pain, and temperature.
- Vitamin D Synthesis: Facilitates the production of vitamin D when exposed to sunlight, essential for bone health.
Comparison with Other Organs
- Large Intestine: Primarily involved in digestion and absorption, but much smaller in size.
- Small Intestine: While longer than the large intestine, it is not as extensive in surface area as the skin.
- Liver: A vital organ for metabolism and detoxification, but again, not larger than the skin in terms of area.
Conclusion
In conclusion, skin is not only the largest organ by area but also plays multiple critical roles in protecting and maintaining the body. Understanding its importance emphasizes the need for proper skincare and protection against environmental factors.
The human body consists of various organs, each playing a unique role in maintaining overall health. Among these, the skin stands out as the largest organ.
What Makes Skin the Largest Organ?
- Surface Area: The skin covers an average area of about 1.5 to 2 square meters in adults.
- Weight: In adults, the skin typically weighs between 3 to 4 kilograms, contributing significantly to the overall body weight.
Functions of the Skin
- Protection: Acts as a barrier against pathogens, chemicals, and physical injuries.
- Regulation: Helps regulate body temperature through sweating and blood flow.
- Sensation: Contains nerve endings that provide the sense of touch, pain, and temperature.
- Vitamin D Synthesis: Facilitates the production of vitamin D when exposed to sunlight, essential for bone health.
Comparison with Other Organs
- Large Intestine: Primarily involved in digestion and absorption, but much smaller in size.
- Small Intestine: While longer than the large intestine, it is not as extensive in surface area as the skin.
- Liver: A vital organ for metabolism and detoxification, but again, not larger than the skin in terms of area.
Conclusion
In conclusion, skin is not only the largest organ by area but also plays multiple critical roles in protecting and maintaining the body. Understanding its importance emphasizes the need for proper skincare and protection against environmental factors.
Waves used for telecommunication are- - a)Visible light
- b)Infrared
- c)Ultraviolet
- d)Microwave
Correct answer is option 'D'. Can you explain this answer?
Waves used for telecommunication are-
a)
Visible light
b)
Infrared
c)
Ultraviolet
d)
Microwave
|
|
Sparsh Iyer answered |
The microwaves are high-frequency signals in the 300 MHz to 300 Ghz range. The signals can carry thousands of channels at the same time, making it a very versatile communication system. Microwave is often used for point-to-point telecommunications. Today microwave is employed by telecommunication industry in the form of both terrestrial relays and satellite communication.
Which of the following is not soluble in water? - a)Lead sulphate
- b)Zinc sulphate
- c)Potassium sulphate
- d)Sodium sulphate
Correct answer is option 'A'. Can you explain this answer?
Which of the following is not soluble in water?
a)
Lead sulphate
b)
Zinc sulphate
c)
Potassium sulphate
d)
Sodium sulphate
|
|
Anagha Nair answered |
Lead Sulphate is not soluble in water.
Sprayer functions are based on - - a)Bernoulli’s principle
- b)Archimedes’ principle
- c)Pascal’s law
- d)Floatation principle
Correct answer is option 'A'. Can you explain this answer?
Sprayer functions are based on -
a)
Bernoulli’s principle
b)
Archimedes’ principle
c)
Pascal’s law
d)
Floatation principle
|
|
Nishanth Nambiar answered |
Sprayer functions are based on Bernoulli’s principle.
A pendulum clock can run faster in- - a)Summer
- b)Winter
- c)Spring season
- d)Rainy season
Correct answer is option 'B'. Can you explain this answer?
A pendulum clock can run faster in-
a)
Summer
b)
Winter
c)
Spring season
d)
Rainy season
|
|
Nishanth Nambiar answered |
A pendulum clock runs faster in winter because in winter the length of the pendulum or the swing become smaller due to contraction and the clock begin to run fast.
Which drug is used for Pain Relief? - a)Risedronate
- b)Tramadol
- c)Folic Acid
- d)Bupropion
Correct answer is option 'B'. Can you explain this answer?
Which drug is used for Pain Relief?
a)
Risedronate
b)
Tramadol
c)
Folic Acid
d)
Bupropion
|
|
Varun Ghosh answered |
Tramadol is used to treat moderate to moderately severe pain.
Mendel’s principle of inheritance is based on- - a)Vegetative reproduction
- b)Asexual reproduction
- c)Sexual reproduction
- d)All of the above
Correct answer is option 'C'. Can you explain this answer?
Mendel’s principle of inheritance is based on-
a)
Vegetative reproduction
b)
Asexual reproduction
c)
Sexual reproduction
d)
All of the above
|
|
Varun Majumdar answered |
Mendel’s principle of inheritance is based on sexual reproduction.
The density of milk can be obtained by the use of: - a)Hydrometer
- b)Butyrometer
- c)Lactometer
- d)Thermometer
Correct answer is option 'C'. Can you explain this answer?
The density of milk can be obtained by the use of:
a)
Hydrometer
b)
Butyrometer
c)
Lactometer
d)
Thermometer
|
|
Aarav Chakraborty answered |
Lactometer is used for the measurement of the density of milk. Butyrometer is used to measure fat content in milk or milk products.
Power of sunglass is- - a)0 Dioptre
- b)1 Dioptre
- c)2 Dioptre
- d)4 Dioptre
Correct answer is option 'A'. Can you explain this answer?
Power of sunglass is-
a)
0 Dioptre
b)
1 Dioptre
c)
2 Dioptre
d)
4 Dioptre
|
|
Varun Ghosh answered |
Power of Sunglass
Introduction:
Sunglasses are a popular accessory that not only enhance our style quotient but also protect our eyes from harmful UV rays. The power of a sunglass refers to its optical power or the degree of curvature of the lens.
Options:
a) 0 Dioptre
b) 1 Dioptre
c) 2 Dioptre
d) 4 Dioptre
Explanation:
The correct answer is option 'A' which is 0 Dioptre. This means that a sunglass does not have any power or refractive property. In simple terms, it does not correct any visual problems like myopia or hyperopia. Its only function is to reduce the amount of light that enters the eye and protect it from harmful UV rays.
The lens of a sunglass is made of high-quality materials that are specially designed to block out UV rays. They also reduce glare and make it more comfortable to be outside on bright sunny days. However, the lens of a sunglass does not have any correctional power and cannot be used as a substitute for prescription glasses.
Conclusion:
In conclusion, the power of a sunglass is 0 Dioptre. It does not have any corrective power and is used primarily for protection against UV rays and glare. It is important to note that wearing sunglasses with UV protection is essential for maintaining good eye health and should be worn whenever one is exposed to sunlight.
Introduction:
Sunglasses are a popular accessory that not only enhance our style quotient but also protect our eyes from harmful UV rays. The power of a sunglass refers to its optical power or the degree of curvature of the lens.
Options:
a) 0 Dioptre
b) 1 Dioptre
c) 2 Dioptre
d) 4 Dioptre
Explanation:
The correct answer is option 'A' which is 0 Dioptre. This means that a sunglass does not have any power or refractive property. In simple terms, it does not correct any visual problems like myopia or hyperopia. Its only function is to reduce the amount of light that enters the eye and protect it from harmful UV rays.
The lens of a sunglass is made of high-quality materials that are specially designed to block out UV rays. They also reduce glare and make it more comfortable to be outside on bright sunny days. However, the lens of a sunglass does not have any correctional power and cannot be used as a substitute for prescription glasses.
Conclusion:
In conclusion, the power of a sunglass is 0 Dioptre. It does not have any corrective power and is used primarily for protection against UV rays and glare. It is important to note that wearing sunglasses with UV protection is essential for maintaining good eye health and should be worn whenever one is exposed to sunlight.
Which among the following is an example of solid sol? - a)Milk of magnesia
- b)Foam
- c)Coloured gemstones
- d)Rubber
Correct answer is option 'C'. Can you explain this answer?
Which among the following is an example of solid sol?
a)
Milk of magnesia
b)
Foam
c)
Coloured gemstones
d)
Rubber
|
|
Madhavan Singh answered |
A type of colloid, of the form of one solid dispersed in another continuous solid is called Solid sol. Coloured Gems is an example of solid sol.
The element found maximum in the soil layer is- - a)Oxygen
- b)Nitrogen
- c)Manganese
- d)Silicon
Correct answer is option 'A'. Can you explain this answer?
The element found maximum in the soil layer is-
a)
Oxygen
b)
Nitrogen
c)
Manganese
d)
Silicon
|
|
Yash Malik answered |
The element found the maximum in the soil layer is Oxygen 46.8% followed by Silicon 27.2%, Calcium 3.65% and Carbon 0.6%.
Which of the following elements has the lowest melting point? - a)Platinum
- b)Carbon
- c)Cobalt
- d)Krypton
Correct answer is option 'D'. Can you explain this answer?
Which of the following elements has the lowest melting point?
a)
Platinum
b)
Carbon
c)
Cobalt
d)
Krypton
|
|
Shounak Iyer answered |
Among the following elements Krypton has the lowest melting point.
Which among the following compounds has the strongest hydrogen bond? - a)HI
- b)HCl
- c)HF
- d)HBr
Correct answer is option 'C'. Can you explain this answer?
Which among the following compounds has the strongest hydrogen bond?
a)
HI
b)
HCl
c)
HF
d)
HBr
|
|
Swati Chopra answered |
HF compounds has the strongest hydrogen bond.
The major chemical compound found in human kidney stones is : - a)Urea
- b)Calcium carbonate
- c)Calcium oxalate
- d)Calcium sulphate
Correct answer is option 'C'. Can you explain this answer?
The major chemical compound found in human kidney stones is :
a)
Urea
b)
Calcium carbonate
c)
Calcium oxalate
d)
Calcium sulphate
|
|
Tejas Saha answered |
Calcium Oxalate is a chemical compound that forms envelope shaped crystals, known in plants as raphides. A major constituent of human kidney stones is calcium oxalate.
Match List I with List II and select the correct answer from the code given below the Lists:
- a)a
- b)b
- c)c
- d)d
Correct answer is option 'A'. Can you explain this answer?
Match List I with List II and select the correct answer from the code given below the Lists:
a)
a
b)
b
c)
c
d)
d
|
|
Varun Majumdar answered |
Progesterone hormones are related to uterus and menstrual cycle of female. Testosterone is secreted by testis of male. Thyroxine is secreted by thyroid gland. Insulin is secreted by pancreas.
Chapter doubts & questions for CTET Practice Test (Science) - Science & Pedagogy Paper 2 for CTET & TET Exams 2024 is part of CTET & State TET exam preparation. The chapters have been prepared according to the CTET & State TET exam syllabus. The Chapter doubts & questions, notes, tests & MCQs are made for CTET & State TET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests here.
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Science & Pedagogy Paper 2 for CTET & TET Exams
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