[1] The theory of inheritance of acquired characters was propounded by -
A.
Charles Darwin
B.
Gregor Mendel
C.
J. B. Lamarck
D.
Weismann
Ans:
J. B. Lamarck
Explanation :
Lamarckism (or Lamarckian inheritance) is the hypothesis that an organism can pass on characteristics that it has acquired through use or disuse during its lifetime to its offspring.
[2] A jet engine works, on the principle of conservation of -
A.
linear momentum
B.
angular momentum
C.
energy
D.
mass
Ans:
linear momentum
Explanation :
Linear momentum is a vector quantity defined as the product of an object's mass, m, and its velocity, v. Linear momentum is denoted by the letter p and is called “momentum” for short: Note that a body's momentum is always in the same direction as its velocity vector.
[3] Which electromagnetic radiation is used for satellite communication?
A.
Ultraviolet
B.
Infrared
C.
Microwave
D.
Millimeter wave
Ans:
Microwave
Explanation :
Microwaves are a form of electromagnetic radiation with wavelengths ranging from as long as one meter to as short as one millimeter; with frequencies between 300 MHz (0.3 GHz) and 300 GHz. This broad definition includes both UHF and EHF (millimeter waves), and various sources use different boundaries. Microwave technology is extensively used for point-to-point telecommunications (i.e. non- broadcast uses). Microwaves are especially suitable for this use since they are more easily focused into narrower beams than radio waves, allowing frequency reuse; their comparatively higher frequencies allow broad bandwidth and high data transmission rates, and antenna sizes are smaller than at lower frequencies because antenna size is inversely proportional to transmitted frequency. Microwaves are used in spacecraft communication, and much of the world's data, TV, and telephone communications are transmitted long distances by microwaves between ground stations and communications satellites.
[4] Solar cells work on the principle of –
A.
photovoltaic effect
B.
photoelectric effect
C.
photoconductive effect
D.
photosynthesis
Ans:
photovoltaic effect
Explanation :
Solar cell is based on the principle of photo-voltaic effect i.e. when light of suitable frequency is incident on it, an emf is produced across its terminals.
[5] When a piece of stone is immersed in water, it displaces water of equal –
A.
Density
B.
Specific gravity
C.
Mass
D.
Volume
Ans:
Mass
Explanation :
Archimedes' Principle states that upward buoyant force exerted on a body immersed in a fluid is equal to the weight of the fluid the body displaces.
[6] Efficiency of the catalyst depends on its -
A.
physical state
B.
amount used
C.
molecular state
D.
number of free valencies
Ans:
number of free valencies
Explanation :
The distribution of free bonds on the catalyst surface is not uniform. These are crowded at the 'peaks', cracks' and corners of the catalyst. The catalytic activity due to adsorption of reacting molecules is maximum at these spots. These are, therefore, referred to as the active centers. The active centers i.e free valencies increase the rate of reaction not only by increasing the concentration of the reactants, but they also activate the molecule adsorbed at two such centers by stretching it.
[7] The oil in the wick of lamp rises due to –
A.
Pressure difference
B.
Pheonomenon of capillarity
C.
Low viscosity of oil
D.
Force of cohesion
Ans:
Pheonomenon of capillarity
Explanation :
The oil in the wick of lamp rises due to phenomenon of capillarity. This phenomenon is called molecular property of matter.
[8] Number of basic SI unit is _.
A.
4
B.
7
C.
6
D.
5
Ans:
7
Explanation :
International System of Units (SI) is the modern metric system of measurement and the dominant system of international commerce and trade. It has seven base units.
[9] Optical fibre works on the -
A.
principle of refraction
B.
total internal reflection
C.
scattering
D.
interference
Ans:
total internal reflection
Explanation :
Optical fiber is a cylindrical dielectric waveguide (non-conducting waveguide) that transmits light along its axis, by the process of total internal reflection.
[10] Gas thermometers are more sensitive than the liquid thermometers because the gases –
A.
have large coefficient of expansion
B.
are lighter
C.
have low specific heat
D.
have high specific heat
Ans:
have large coefficient of expansion
Explanation :
Gases are more sensitive to the temperature than liquids (such as mercury). That means gas expands more than the mercury for the same increase of temperature. Hence the gas thermometer is more sensitive than liquid (mercury) thereto-meter.
[11] A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.
A.
1 : 1
B.
1 : 2
C.
1 : 4
D.
Cannot be found from the given information.
Ans:
1 : 1
Explanation :
The stone which is throws upward will have the same velocity of u at the point of its original position when it is falling down. Another stone is thrown downwards with u. So the velocity of both the stones is equal at the original point. Hence both stone will hit the ground with same velocity. So the ratio between the speeds of two stones will be 1:1
[12] The locomotion of insects to the source of light is called :
A.
Phototropic
B.
Hydrotropic
C.
Phototactic
D.
Thermotactic
Ans:
Phototropic
Explanation :
The growth or movement of a plant part in response to a source of light is called phototropism. It is most often observed in plants, but can also occur in other organisms such as fungi.
[13] The splitting of white light into its components is due to:
A.
Reflection
B.
Refraction
C.
Transmission
D.
Dispersion
Ans:
Dispersion
Explanation :
Dispersion is used to separate a beam of white light into its constituent spectrum of colours. This phenomenon leads to rainbow.
[14] The moment of inertia of a body does not depend upon its –
A.
axis of rotation
B.
angular velocity
C.
form of mass
D.
distribution of mass
Ans:
angular velocity
Explanation :
Moment of inertia is the mass property of a rigid body that determines the torque needed for a desired angular acceleration about an axis of rotation. Moment of inertia depends on the shape of the body and the amount and distribution of its mass. It can be found through the sum of moments of inertia of the masses making up the whole object, under the same conditions.
[15] The speed of light will be minimum while passing through -
A.
water
B.
vaccum
C.
air
D.
glass
Ans:
glass
Explanation :
T Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3; see Figure 1) and 200,000 kilometers per second in glass (refractive index of 1.5).
[16] is the cell organelle, in which the biochemical processes of respiration and energy production occur.
A.
Mitochondria
B.
Chloroplast
C.
Ribosomes
D.
Nucleus
Ans:
Mitochondria
Explanation :
Mitochondria is an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
[17] Amount of water vapour in a unit volume (Cubic metre) of air is called:
A.
Mixed ratio
B.
relative humidity
C.
absolute humidity
D.
specific humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] Which waves cannot be transmitted through vacuum -
A.
Light
B.
Heat
C.
Sound
D.
Electromagnetic
Ans:
Sound
Explanation :
Sound waves cannot be transmitted through vacuum. It is transmitted by the movement of particles along with the direction of the motion of the sound wave. More generally, sound is a mechanical disturbance which is dependent upon a medium to travel.
[19] Super cooling stands for cooling of a liquid –
A.
at freezing point
B.
below freezing point
C.
at melting point
D.
above melting point
Ans:
below freezing point
Explanation :
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.
[20] Alcohol is more volatile than water because is lower than water.
A.
its boiling point
B.
its density
C.
its viscosity
D.
its surface tension
Ans:
its boiling point
Explanation :
Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pres-sure and a lower boiling point than water; therefore, it evaporates more quickly. Its low boiling point of 78° C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.
[21] The boiling point of water depends upon the –
A.
atmospheric pressure
B.
volume
C.
density
D.
mass
Ans:
atmospheric pressure
Explanation :
The boiling point corresponds of water to the temperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on the atmospheric pressure. For example, at higher altitudes, the atmospheric pressure decreases. As this pressure decreases, the boiling point of the water also decreases.
[22] The loudness of sound depends upon .
A.
Velocity
B.
Pitch
C.
Amplitude
D.
Wavelength
Ans:
Wavelength
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[23] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[24] Who among the following is the scalar quantity .
A.
force
B.
pressure
C.
velocity
D.
acceleration
Ans:
pressure
Explanation :
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
[25] When net torque is zero, will be constant -
A.
force
B.
angular momentum
C.
linear momentum
D.
acceleration
Ans:
angular momentum
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Explanation :
Lamarckism (or Lamarckian inheritance) is the hypothesis that an organism can pass on characteristics that it has acquired through use or disuse during its lifetime to its offspring.
[2] A jet engine works, on the principle of conservation of -
A.
linear momentum
B.
angular momentum
C.
energy
D.
mass
Ans:
linear momentum
Explanation :
Linear momentum is a vector quantity defined as the product of an object's mass, m, and its velocity, v. Linear momentum is denoted by the letter p and is called “momentum” for short: Note that a body's momentum is always in the same direction as its velocity vector.
[3] Which electromagnetic radiation is used for satellite communication?
A.
Ultraviolet
B.
Infrared
C.
Microwave
D.
Millimeter wave
Ans:
Microwave
Explanation :
Microwaves are a form of electromagnetic radiation with wavelengths ranging from as long as one meter to as short as one millimeter; with frequencies between 300 MHz (0.3 GHz) and 300 GHz. This broad definition includes both UHF and EHF (millimeter waves), and various sources use different boundaries. Microwave technology is extensively used for point-to-point telecommunications (i.e. non- broadcast uses). Microwaves are especially suitable for this use since they are more easily focused into narrower beams than radio waves, allowing frequency reuse; their comparatively higher frequencies allow broad bandwidth and high data transmission rates, and antenna sizes are smaller than at lower frequencies because antenna size is inversely proportional to transmitted frequency. Microwaves are used in spacecraft communication, and much of the world's data, TV, and telephone communications are transmitted long distances by microwaves between ground stations and communications satellites.
[4] Solar cells work on the principle of –
A.
photovoltaic effect
B.
photoelectric effect
C.
photoconductive effect
D.
photosynthesis
Ans:
photovoltaic effect
Explanation :
Solar cell is based on the principle of photo-voltaic effect i.e. when light of suitable frequency is incident on it, an emf is produced across its terminals.
[5] When a piece of stone is immersed in water, it displaces water of equal –
A.
Density
B.
Specific gravity
C.
Mass
D.
Volume
Ans:
Mass
Explanation :
Archimedes' Principle states that upward buoyant force exerted on a body immersed in a fluid is equal to the weight of the fluid the body displaces.
[6] Efficiency of the catalyst depends on its -
A.
physical state
B.
amount used
C.
molecular state
D.
number of free valencies
Ans:
number of free valencies
Explanation :
The distribution of free bonds on the catalyst surface is not uniform. These are crowded at the 'peaks', cracks' and corners of the catalyst. The catalytic activity due to adsorption of reacting molecules is maximum at these spots. These are, therefore, referred to as the active centers. The active centers i.e free valencies increase the rate of reaction not only by increasing the concentration of the reactants, but they also activate the molecule adsorbed at two such centers by stretching it.
[7] The oil in the wick of lamp rises due to –
A.
Pressure difference
B.
Pheonomenon of capillarity
C.
Low viscosity of oil
D.
Force of cohesion
Ans:
Pheonomenon of capillarity
Explanation :
The oil in the wick of lamp rises due to phenomenon of capillarity. This phenomenon is called molecular property of matter.
[8] Number of basic SI unit is _.
A.
4
B.
7
C.
6
D.
5
Ans:
7
Explanation :
International System of Units (SI) is the modern metric system of measurement and the dominant system of international commerce and trade. It has seven base units.
[9] Optical fibre works on the -
A.
principle of refraction
B.
total internal reflection
C.
scattering
D.
interference
Ans:
total internal reflection
Explanation :
Optical fiber is a cylindrical dielectric waveguide (non-conducting waveguide) that transmits light along its axis, by the process of total internal reflection.
[10] Gas thermometers are more sensitive than the liquid thermometers because the gases –
A.
have large coefficient of expansion
B.
are lighter
C.
have low specific heat
D.
have high specific heat
Ans:
have large coefficient of expansion
Explanation :
Gases are more sensitive to the temperature than liquids (such as mercury). That means gas expands more than the mercury for the same increase of temperature. Hence the gas thermometer is more sensitive than liquid (mercury) thereto-meter.
[11] A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.
A.
1 : 1
B.
1 : 2
C.
1 : 4
D.
Cannot be found from the given information.
Ans:
1 : 1
Explanation :
The stone which is throws upward will have the same velocity of u at the point of its original position when it is falling down. Another stone is thrown downwards with u. So the velocity of both the stones is equal at the original point. Hence both stone will hit the ground with same velocity. So the ratio between the speeds of two stones will be 1:1
[12] The locomotion of insects to the source of light is called :
A.
Phototropic
B.
Hydrotropic
C.
Phototactic
D.
Thermotactic
Ans:
Phototropic
Explanation :
The growth or movement of a plant part in response to a source of light is called phototropism. It is most often observed in plants, but can also occur in other organisms such as fungi.
[13] The splitting of white light into its components is due to:
A.
Reflection
B.
Refraction
C.
Transmission
D.
Dispersion
Ans:
Dispersion
Explanation :
Dispersion is used to separate a beam of white light into its constituent spectrum of colours. This phenomenon leads to rainbow.
[14] The moment of inertia of a body does not depend upon its –
A.
axis of rotation
B.
angular velocity
C.
form of mass
D.
distribution of mass
Ans:
angular velocity
Explanation :
Moment of inertia is the mass property of a rigid body that determines the torque needed for a desired angular acceleration about an axis of rotation. Moment of inertia depends on the shape of the body and the amount and distribution of its mass. It can be found through the sum of moments of inertia of the masses making up the whole object, under the same conditions.
[15] The speed of light will be minimum while passing through -
A.
water
B.
vaccum
C.
air
D.
glass
Ans:
glass
Explanation :
T Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3; see Figure 1) and 200,000 kilometers per second in glass (refractive index of 1.5).
[16] is the cell organelle, in which the biochemical processes of respiration and energy production occur.
A.
Mitochondria
B.
Chloroplast
C.
Ribosomes
D.
Nucleus
Ans:
Mitochondria
Explanation :
Mitochondria is an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
[17] Amount of water vapour in a unit volume (Cubic metre) of air is called:
A.
Mixed ratio
B.
relative humidity
C.
absolute humidity
D.
specific humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] Which waves cannot be transmitted through vacuum -
A.
Light
B.
Heat
C.
Sound
D.
Electromagnetic
Ans:
Sound
Explanation :
Sound waves cannot be transmitted through vacuum. It is transmitted by the movement of particles along with the direction of the motion of the sound wave. More generally, sound is a mechanical disturbance which is dependent upon a medium to travel.
[19] Super cooling stands for cooling of a liquid –
A.
at freezing point
B.
below freezing point
C.
at melting point
D.
above melting point
Ans:
below freezing point
Explanation :
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.
[20] Alcohol is more volatile than water because is lower than water.
A.
its boiling point
B.
its density
C.
its viscosity
D.
its surface tension
Ans:
its boiling point
Explanation :
Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pres-sure and a lower boiling point than water; therefore, it evaporates more quickly. Its low boiling point of 78° C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.
[21] The boiling point of water depends upon the –
A.
atmospheric pressure
B.
volume
C.
density
D.
mass
Ans:
atmospheric pressure
Explanation :
The boiling point corresponds of water to the temperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on the atmospheric pressure. For example, at higher altitudes, the atmospheric pressure decreases. As this pressure decreases, the boiling point of the water also decreases.
[22] The loudness of sound depends upon .
A.
Velocity
B.
Pitch
C.
Amplitude
D.
Wavelength
Ans:
Wavelength
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[23] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[24] Who among the following is the scalar quantity .
A.
force
B.
pressure
C.
velocity
D.
acceleration
Ans:
pressure
Explanation :
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
[25] When net torque is zero, will be constant -
A.
force
B.
angular momentum
C.
linear momentum
D.
acceleration
Ans:
angular momentum
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Explanation :
Microwaves are a form of electromagnetic radiation with wavelengths ranging from as long as one meter to as short as one millimeter; with frequencies between 300 MHz (0.3 GHz) and 300 GHz. This broad definition includes both UHF and EHF (millimeter waves), and various sources use different boundaries. Microwave technology is extensively used for point-to-point telecommunications (i.e. non- broadcast uses). Microwaves are especially suitable for this use since they are more easily focused into narrower beams than radio waves, allowing frequency reuse; their comparatively higher frequencies allow broad bandwidth and high data transmission rates, and antenna sizes are smaller than at lower frequencies because antenna size is inversely proportional to transmitted frequency. Microwaves are used in spacecraft communication, and much of the world's data, TV, and telephone communications are transmitted long distances by microwaves between ground stations and communications satellites.
[4] Solar cells work on the principle of –
A.
photovoltaic effect
B.
photoelectric effect
C.
photoconductive effect
D.
photosynthesis
Ans:
photovoltaic effect
Explanation :
Solar cell is based on the principle of photo-voltaic effect i.e. when light of suitable frequency is incident on it, an emf is produced across its terminals.
[5] When a piece of stone is immersed in water, it displaces water of equal –
A.
Density
B.
Specific gravity
C.
Mass
D.
Volume
Ans:
Mass
Explanation :
Archimedes' Principle states that upward buoyant force exerted on a body immersed in a fluid is equal to the weight of the fluid the body displaces.
[6] Efficiency of the catalyst depends on its -
A.
physical state
B.
amount used
C.
molecular state
D.
number of free valencies
Ans:
number of free valencies
Explanation :
The distribution of free bonds on the catalyst surface is not uniform. These are crowded at the 'peaks', cracks' and corners of the catalyst. The catalytic activity due to adsorption of reacting molecules is maximum at these spots. These are, therefore, referred to as the active centers. The active centers i.e free valencies increase the rate of reaction not only by increasing the concentration of the reactants, but they also activate the molecule adsorbed at two such centers by stretching it.
[7] The oil in the wick of lamp rises due to –
A.
Pressure difference
B.
Pheonomenon of capillarity
C.
Low viscosity of oil
D.
Force of cohesion
Ans:
Pheonomenon of capillarity
Explanation :
The oil in the wick of lamp rises due to phenomenon of capillarity. This phenomenon is called molecular property of matter.
[8] Number of basic SI unit is _.
A.
4
B.
7
C.
6
D.
5
Ans:
7
Explanation :
International System of Units (SI) is the modern metric system of measurement and the dominant system of international commerce and trade. It has seven base units.
[9] Optical fibre works on the -
A.
principle of refraction
B.
total internal reflection
C.
scattering
D.
interference
Ans:
total internal reflection
Explanation :
Optical fiber is a cylindrical dielectric waveguide (non-conducting waveguide) that transmits light along its axis, by the process of total internal reflection.
[10] Gas thermometers are more sensitive than the liquid thermometers because the gases –
A.
have large coefficient of expansion
B.
are lighter
C.
have low specific heat
D.
have high specific heat
Ans:
have large coefficient of expansion
Explanation :
Gases are more sensitive to the temperature than liquids (such as mercury). That means gas expands more than the mercury for the same increase of temperature. Hence the gas thermometer is more sensitive than liquid (mercury) thereto-meter.
[11] A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.
A.
1 : 1
B.
1 : 2
C.
1 : 4
D.
Cannot be found from the given information.
Ans:
1 : 1
Explanation :
The stone which is throws upward will have the same velocity of u at the point of its original position when it is falling down. Another stone is thrown downwards with u. So the velocity of both the stones is equal at the original point. Hence both stone will hit the ground with same velocity. So the ratio between the speeds of two stones will be 1:1
[12] The locomotion of insects to the source of light is called :
A.
Phototropic
B.
Hydrotropic
C.
Phototactic
D.
Thermotactic
Ans:
Phototropic
Explanation :
The growth or movement of a plant part in response to a source of light is called phototropism. It is most often observed in plants, but can also occur in other organisms such as fungi.
[13] The splitting of white light into its components is due to:
A.
Reflection
B.
Refraction
C.
Transmission
D.
Dispersion
Ans:
Dispersion
Explanation :
Dispersion is used to separate a beam of white light into its constituent spectrum of colours. This phenomenon leads to rainbow.
[14] The moment of inertia of a body does not depend upon its –
A.
axis of rotation
B.
angular velocity
C.
form of mass
D.
distribution of mass
Ans:
angular velocity
Explanation :
Moment of inertia is the mass property of a rigid body that determines the torque needed for a desired angular acceleration about an axis of rotation. Moment of inertia depends on the shape of the body and the amount and distribution of its mass. It can be found through the sum of moments of inertia of the masses making up the whole object, under the same conditions.
[15] The speed of light will be minimum while passing through -
A.
water
B.
vaccum
C.
air
D.
glass
Ans:
glass
Explanation :
T Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3; see Figure 1) and 200,000 kilometers per second in glass (refractive index of 1.5).
[16] is the cell organelle, in which the biochemical processes of respiration and energy production occur.
A.
Mitochondria
B.
Chloroplast
C.
Ribosomes
D.
Nucleus
Ans:
Mitochondria
Explanation :
Mitochondria is an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
[17] Amount of water vapour in a unit volume (Cubic metre) of air is called:
A.
Mixed ratio
B.
relative humidity
C.
absolute humidity
D.
specific humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] Which waves cannot be transmitted through vacuum -
A.
Light
B.
Heat
C.
Sound
D.
Electromagnetic
Ans:
Sound
Explanation :
Sound waves cannot be transmitted through vacuum. It is transmitted by the movement of particles along with the direction of the motion of the sound wave. More generally, sound is a mechanical disturbance which is dependent upon a medium to travel.
[19] Super cooling stands for cooling of a liquid –
A.
at freezing point
B.
below freezing point
C.
at melting point
D.
above melting point
Ans:
below freezing point
Explanation :
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.
[20] Alcohol is more volatile than water because is lower than water.
A.
its boiling point
B.
its density
C.
its viscosity
D.
its surface tension
Ans:
its boiling point
Explanation :
Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pres-sure and a lower boiling point than water; therefore, it evaporates more quickly. Its low boiling point of 78° C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.
[21] The boiling point of water depends upon the –
A.
atmospheric pressure
B.
volume
C.
density
D.
mass
Ans:
atmospheric pressure
Explanation :
The boiling point corresponds of water to the temperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on the atmospheric pressure. For example, at higher altitudes, the atmospheric pressure decreases. As this pressure decreases, the boiling point of the water also decreases.
[22] The loudness of sound depends upon .
A.
Velocity
B.
Pitch
C.
Amplitude
D.
Wavelength
Ans:
Wavelength
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[23] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[24] Who among the following is the scalar quantity .
A.
force
B.
pressure
C.
velocity
D.
acceleration
Ans:
pressure
Explanation :
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
[25] When net torque is zero, will be constant -
A.
force
B.
angular momentum
C.
linear momentum
D.
acceleration
Ans:
angular momentum
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Explanation :
Archimedes' Principle states that upward buoyant force exerted on a body immersed in a fluid is equal to the weight of the fluid the body displaces.
[6] Efficiency of the catalyst depends on its -
A.
physical state
B.
amount used
C.
molecular state
D.
number of free valencies
Ans:
number of free valencies
Explanation :
The distribution of free bonds on the catalyst surface is not uniform. These are crowded at the 'peaks', cracks' and corners of the catalyst. The catalytic activity due to adsorption of reacting molecules is maximum at these spots. These are, therefore, referred to as the active centers. The active centers i.e free valencies increase the rate of reaction not only by increasing the concentration of the reactants, but they also activate the molecule adsorbed at two such centers by stretching it.
[7] The oil in the wick of lamp rises due to –
A.
Pressure difference
B.
Pheonomenon of capillarity
C.
Low viscosity of oil
D.
Force of cohesion
Ans:
Pheonomenon of capillarity
Explanation :
The oil in the wick of lamp rises due to phenomenon of capillarity. This phenomenon is called molecular property of matter.
[8] Number of basic SI unit is _.
A.
4
B.
7
C.
6
D.
5
Ans:
7
Explanation :
International System of Units (SI) is the modern metric system of measurement and the dominant system of international commerce and trade. It has seven base units.
[9] Optical fibre works on the -
A.
principle of refraction
B.
total internal reflection
C.
scattering
D.
interference
Ans:
total internal reflection
Explanation :
Optical fiber is a cylindrical dielectric waveguide (non-conducting waveguide) that transmits light along its axis, by the process of total internal reflection.
[10] Gas thermometers are more sensitive than the liquid thermometers because the gases –
A.
have large coefficient of expansion
B.
are lighter
C.
have low specific heat
D.
have high specific heat
Ans:
have large coefficient of expansion
Explanation :
Gases are more sensitive to the temperature than liquids (such as mercury). That means gas expands more than the mercury for the same increase of temperature. Hence the gas thermometer is more sensitive than liquid (mercury) thereto-meter.
[11] A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.
A.
1 : 1
B.
1 : 2
C.
1 : 4
D.
Cannot be found from the given information.
Ans:
1 : 1
Explanation :
The stone which is throws upward will have the same velocity of u at the point of its original position when it is falling down. Another stone is thrown downwards with u. So the velocity of both the stones is equal at the original point. Hence both stone will hit the ground with same velocity. So the ratio between the speeds of two stones will be 1:1
[12] The locomotion of insects to the source of light is called :
A.
Phototropic
B.
Hydrotropic
C.
Phototactic
D.
Thermotactic
Ans:
Phototropic
Explanation :
The growth or movement of a plant part in response to a source of light is called phototropism. It is most often observed in plants, but can also occur in other organisms such as fungi.
[13] The splitting of white light into its components is due to:
A.
Reflection
B.
Refraction
C.
Transmission
D.
Dispersion
Ans:
Dispersion
Explanation :
Dispersion is used to separate a beam of white light into its constituent spectrum of colours. This phenomenon leads to rainbow.
[14] The moment of inertia of a body does not depend upon its –
A.
axis of rotation
B.
angular velocity
C.
form of mass
D.
distribution of mass
Ans:
angular velocity
Explanation :
Moment of inertia is the mass property of a rigid body that determines the torque needed for a desired angular acceleration about an axis of rotation. Moment of inertia depends on the shape of the body and the amount and distribution of its mass. It can be found through the sum of moments of inertia of the masses making up the whole object, under the same conditions.
[15] The speed of light will be minimum while passing through -
A.
water
B.
vaccum
C.
air
D.
glass
Ans:
glass
Explanation :
T Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3; see Figure 1) and 200,000 kilometers per second in glass (refractive index of 1.5).
[16] is the cell organelle, in which the biochemical processes of respiration and energy production occur.
A.
Mitochondria
B.
Chloroplast
C.
Ribosomes
D.
Nucleus
Ans:
Mitochondria
Explanation :
Mitochondria is an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
[17] Amount of water vapour in a unit volume (Cubic metre) of air is called:
A.
Mixed ratio
B.
relative humidity
C.
absolute humidity
D.
specific humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] Which waves cannot be transmitted through vacuum -
A.
Light
B.
Heat
C.
Sound
D.
Electromagnetic
Ans:
Sound
Explanation :
Sound waves cannot be transmitted through vacuum. It is transmitted by the movement of particles along with the direction of the motion of the sound wave. More generally, sound is a mechanical disturbance which is dependent upon a medium to travel.
[19] Super cooling stands for cooling of a liquid –
A.
at freezing point
B.
below freezing point
C.
at melting point
D.
above melting point
Ans:
below freezing point
Explanation :
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.
[20] Alcohol is more volatile than water because is lower than water.
A.
its boiling point
B.
its density
C.
its viscosity
D.
its surface tension
Ans:
its boiling point
Explanation :
Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pres-sure and a lower boiling point than water; therefore, it evaporates more quickly. Its low boiling point of 78° C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.
[21] The boiling point of water depends upon the –
A.
atmospheric pressure
B.
volume
C.
density
D.
mass
Ans:
atmospheric pressure
Explanation :
The boiling point corresponds of water to the temperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on the atmospheric pressure. For example, at higher altitudes, the atmospheric pressure decreases. As this pressure decreases, the boiling point of the water also decreases.
[22] The loudness of sound depends upon .
A.
Velocity
B.
Pitch
C.
Amplitude
D.
Wavelength
Ans:
Wavelength
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[23] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[24] Who among the following is the scalar quantity .
A.
force
B.
pressure
C.
velocity
D.
acceleration
Ans:
pressure
Explanation :
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
[25] When net torque is zero, will be constant -
A.
force
B.
angular momentum
C.
linear momentum
D.
acceleration
Ans:
angular momentum
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Explanation :
The oil in the wick of lamp rises due to phenomenon of capillarity. This phenomenon is called molecular property of matter.
[8] Number of basic SI unit is _.
A.
4
B.
7
C.
6
D.
5
Ans:
7
Explanation :
International System of Units (SI) is the modern metric system of measurement and the dominant system of international commerce and trade. It has seven base units.
[9] Optical fibre works on the -
A.
principle of refraction
B.
total internal reflection
C.
scattering
D.
interference
Ans:
total internal reflection
Explanation :
Optical fiber is a cylindrical dielectric waveguide (non-conducting waveguide) that transmits light along its axis, by the process of total internal reflection.
[10] Gas thermometers are more sensitive than the liquid thermometers because the gases –
A.
have large coefficient of expansion
B.
are lighter
C.
have low specific heat
D.
have high specific heat
Ans:
have large coefficient of expansion
Explanation :
Gases are more sensitive to the temperature than liquids (such as mercury). That means gas expands more than the mercury for the same increase of temperature. Hence the gas thermometer is more sensitive than liquid (mercury) thereto-meter.
[11] A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.
A.
1 : 1
B.
1 : 2
C.
1 : 4
D.
Cannot be found from the given information.
Ans:
1 : 1
Explanation :
The stone which is throws upward will have the same velocity of u at the point of its original position when it is falling down. Another stone is thrown downwards with u. So the velocity of both the stones is equal at the original point. Hence both stone will hit the ground with same velocity. So the ratio between the speeds of two stones will be 1:1
[12] The locomotion of insects to the source of light is called :
A.
Phototropic
B.
Hydrotropic
C.
Phototactic
D.
Thermotactic
Ans:
Phototropic
Explanation :
The growth or movement of a plant part in response to a source of light is called phototropism. It is most often observed in plants, but can also occur in other organisms such as fungi.
[13] The splitting of white light into its components is due to:
A.
Reflection
B.
Refraction
C.
Transmission
D.
Dispersion
Ans:
Dispersion
Explanation :
Dispersion is used to separate a beam of white light into its constituent spectrum of colours. This phenomenon leads to rainbow.
[14] The moment of inertia of a body does not depend upon its –
A.
axis of rotation
B.
angular velocity
C.
form of mass
D.
distribution of mass
Ans:
angular velocity
Explanation :
Moment of inertia is the mass property of a rigid body that determines the torque needed for a desired angular acceleration about an axis of rotation. Moment of inertia depends on the shape of the body and the amount and distribution of its mass. It can be found through the sum of moments of inertia of the masses making up the whole object, under the same conditions.
[15] The speed of light will be minimum while passing through -
A.
water
B.
vaccum
C.
air
D.
glass
Ans:
glass
Explanation :
T Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3; see Figure 1) and 200,000 kilometers per second in glass (refractive index of 1.5).
[16] is the cell organelle, in which the biochemical processes of respiration and energy production occur.
A.
Mitochondria
B.
Chloroplast
C.
Ribosomes
D.
Nucleus
Ans:
Mitochondria
Explanation :
Mitochondria is an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
[17] Amount of water vapour in a unit volume (Cubic metre) of air is called:
A.
Mixed ratio
B.
relative humidity
C.
absolute humidity
D.
specific humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] Which waves cannot be transmitted through vacuum -
A.
Light
B.
Heat
C.
Sound
D.
Electromagnetic
Ans:
Sound
Explanation :
Sound waves cannot be transmitted through vacuum. It is transmitted by the movement of particles along with the direction of the motion of the sound wave. More generally, sound is a mechanical disturbance which is dependent upon a medium to travel.
[19] Super cooling stands for cooling of a liquid –
A.
at freezing point
B.
below freezing point
C.
at melting point
D.
above melting point
Ans:
below freezing point
Explanation :
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.
[20] Alcohol is more volatile than water because is lower than water.
A.
its boiling point
B.
its density
C.
its viscosity
D.
its surface tension
Ans:
its boiling point
Explanation :
Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pres-sure and a lower boiling point than water; therefore, it evaporates more quickly. Its low boiling point of 78° C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.
[21] The boiling point of water depends upon the –
A.
atmospheric pressure
B.
volume
C.
density
D.
mass
Ans:
atmospheric pressure
Explanation :
The boiling point corresponds of water to the temperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on the atmospheric pressure. For example, at higher altitudes, the atmospheric pressure decreases. As this pressure decreases, the boiling point of the water also decreases.
[22] The loudness of sound depends upon .
A.
Velocity
B.
Pitch
C.
Amplitude
D.
Wavelength
Ans:
Wavelength
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[23] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[24] Who among the following is the scalar quantity .
A.
force
B.
pressure
C.
velocity
D.
acceleration
Ans:
pressure
Explanation :
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
[25] When net torque is zero, will be constant -
A.
force
B.
angular momentum
C.
linear momentum
D.
acceleration
Ans:
angular momentum
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Explanation :
Optical fiber is a cylindrical dielectric waveguide (non-conducting waveguide) that transmits light along its axis, by the process of total internal reflection.
[10] Gas thermometers are more sensitive than the liquid thermometers because the gases –
A.
have large coefficient of expansion
B.
are lighter
C.
have low specific heat
D.
have high specific heat
Ans:
have large coefficient of expansion
Explanation :
Gases are more sensitive to the temperature than liquids (such as mercury). That means gas expands more than the mercury for the same increase of temperature. Hence the gas thermometer is more sensitive than liquid (mercury) thereto-meter.
[11] A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.
A.
1 : 1
B.
1 : 2
C.
1 : 4
D.
Cannot be found from the given information.
Ans:
1 : 1
Explanation :
The stone which is throws upward will have the same velocity of u at the point of its original position when it is falling down. Another stone is thrown downwards with u. So the velocity of both the stones is equal at the original point. Hence both stone will hit the ground with same velocity. So the ratio between the speeds of two stones will be 1:1
[12] The locomotion of insects to the source of light is called :
A.
Phototropic
B.
Hydrotropic
C.
Phototactic
D.
Thermotactic
Ans:
Phototropic
Explanation :
The growth or movement of a plant part in response to a source of light is called phototropism. It is most often observed in plants, but can also occur in other organisms such as fungi.
[13] The splitting of white light into its components is due to:
A.
Reflection
B.
Refraction
C.
Transmission
D.
Dispersion
Ans:
Dispersion
Explanation :
Dispersion is used to separate a beam of white light into its constituent spectrum of colours. This phenomenon leads to rainbow.
[14] The moment of inertia of a body does not depend upon its –
A.
axis of rotation
B.
angular velocity
C.
form of mass
D.
distribution of mass
Ans:
angular velocity
Explanation :
Moment of inertia is the mass property of a rigid body that determines the torque needed for a desired angular acceleration about an axis of rotation. Moment of inertia depends on the shape of the body and the amount and distribution of its mass. It can be found through the sum of moments of inertia of the masses making up the whole object, under the same conditions.
[15] The speed of light will be minimum while passing through -
A.
water
B.
vaccum
C.
air
D.
glass
Ans:
glass
Explanation :
T Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3; see Figure 1) and 200,000 kilometers per second in glass (refractive index of 1.5).
[16] is the cell organelle, in which the biochemical processes of respiration and energy production occur.
A.
Mitochondria
B.
Chloroplast
C.
Ribosomes
D.
Nucleus
Ans:
Mitochondria
Explanation :
Mitochondria is an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
[17] Amount of water vapour in a unit volume (Cubic metre) of air is called:
A.
Mixed ratio
B.
relative humidity
C.
absolute humidity
D.
specific humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] Which waves cannot be transmitted through vacuum -
A.
Light
B.
Heat
C.
Sound
D.
Electromagnetic
Ans:
Sound
Explanation :
Sound waves cannot be transmitted through vacuum. It is transmitted by the movement of particles along with the direction of the motion of the sound wave. More generally, sound is a mechanical disturbance which is dependent upon a medium to travel.
[19] Super cooling stands for cooling of a liquid –
A.
at freezing point
B.
below freezing point
C.
at melting point
D.
above melting point
Ans:
below freezing point
Explanation :
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.
[20] Alcohol is more volatile than water because is lower than water.
A.
its boiling point
B.
its density
C.
its viscosity
D.
its surface tension
Ans:
its boiling point
Explanation :
Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pres-sure and a lower boiling point than water; therefore, it evaporates more quickly. Its low boiling point of 78° C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.
[21] The boiling point of water depends upon the –
A.
atmospheric pressure
B.
volume
C.
density
D.
mass
Ans:
atmospheric pressure
Explanation :
The boiling point corresponds of water to the temperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on the atmospheric pressure. For example, at higher altitudes, the atmospheric pressure decreases. As this pressure decreases, the boiling point of the water also decreases.
[22] The loudness of sound depends upon .
A.
Velocity
B.
Pitch
C.
Amplitude
D.
Wavelength
Ans:
Wavelength
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[23] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[24] Who among the following is the scalar quantity .
A.
force
B.
pressure
C.
velocity
D.
acceleration
Ans:
pressure
Explanation :
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
[25] When net torque is zero, will be constant -
A.
force
B.
angular momentum
C.
linear momentum
D.
acceleration
Ans:
angular momentum
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Explanation :
The stone which is throws upward will have the same velocity of u at the point of its original position when it is falling down. Another stone is thrown downwards with u. So the velocity of both the stones is equal at the original point. Hence both stone will hit the ground with same velocity. So the ratio between the speeds of two stones will be 1:1
[12] The locomotion of insects to the source of light is called :
A.
Phototropic
B.
Hydrotropic
C.
Phototactic
D.
Thermotactic
Ans:
Phototropic
Explanation :
The growth or movement of a plant part in response to a source of light is called phototropism. It is most often observed in plants, but can also occur in other organisms such as fungi.
[13] The splitting of white light into its components is due to:
A.
Reflection
B.
Refraction
C.
Transmission
D.
Dispersion
Ans:
Dispersion
Explanation :
Dispersion is used to separate a beam of white light into its constituent spectrum of colours. This phenomenon leads to rainbow.
[14] The moment of inertia of a body does not depend upon its –
A.
axis of rotation
B.
angular velocity
C.
form of mass
D.
distribution of mass
Ans:
angular velocity
Explanation :
Moment of inertia is the mass property of a rigid body that determines the torque needed for a desired angular acceleration about an axis of rotation. Moment of inertia depends on the shape of the body and the amount and distribution of its mass. It can be found through the sum of moments of inertia of the masses making up the whole object, under the same conditions.
[15] The speed of light will be minimum while passing through -
A.
water
B.
vaccum
C.
air
D.
glass
Ans:
glass
Explanation :
T Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3; see Figure 1) and 200,000 kilometers per second in glass (refractive index of 1.5).
[16] is the cell organelle, in which the biochemical processes of respiration and energy production occur.
A.
Mitochondria
B.
Chloroplast
C.
Ribosomes
D.
Nucleus
Ans:
Mitochondria
Explanation :
Mitochondria is an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
[17] Amount of water vapour in a unit volume (Cubic metre) of air is called:
A.
Mixed ratio
B.
relative humidity
C.
absolute humidity
D.
specific humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] Which waves cannot be transmitted through vacuum -
A.
Light
B.
Heat
C.
Sound
D.
Electromagnetic
Ans:
Sound
Explanation :
Sound waves cannot be transmitted through vacuum. It is transmitted by the movement of particles along with the direction of the motion of the sound wave. More generally, sound is a mechanical disturbance which is dependent upon a medium to travel.
[19] Super cooling stands for cooling of a liquid –
A.
at freezing point
B.
below freezing point
C.
at melting point
D.
above melting point
Ans:
below freezing point
Explanation :
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.
[20] Alcohol is more volatile than water because is lower than water.
A.
its boiling point
B.
its density
C.
its viscosity
D.
its surface tension
Ans:
its boiling point
Explanation :
Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pres-sure and a lower boiling point than water; therefore, it evaporates more quickly. Its low boiling point of 78° C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.
[21] The boiling point of water depends upon the –
A.
atmospheric pressure
B.
volume
C.
density
D.
mass
Ans:
atmospheric pressure
Explanation :
The boiling point corresponds of water to the temperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on the atmospheric pressure. For example, at higher altitudes, the atmospheric pressure decreases. As this pressure decreases, the boiling point of the water also decreases.
[22] The loudness of sound depends upon .
A.
Velocity
B.
Pitch
C.
Amplitude
D.
Wavelength
Ans:
Wavelength
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[23] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[24] Who among the following is the scalar quantity .
A.
force
B.
pressure
C.
velocity
D.
acceleration
Ans:
pressure
Explanation :
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
[25] When net torque is zero, will be constant -
A.
force
B.
angular momentum
C.
linear momentum
D.
acceleration
Ans:
angular momentum
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Explanation :
Dispersion is used to separate a beam of white light into its constituent spectrum of colours. This phenomenon leads to rainbow.
[14] The moment of inertia of a body does not depend upon its –
A.
axis of rotation
B.
angular velocity
C.
form of mass
D.
distribution of mass
Ans:
angular velocity
Explanation :
Moment of inertia is the mass property of a rigid body that determines the torque needed for a desired angular acceleration about an axis of rotation. Moment of inertia depends on the shape of the body and the amount and distribution of its mass. It can be found through the sum of moments of inertia of the masses making up the whole object, under the same conditions.
[15] The speed of light will be minimum while passing through -
A.
water
B.
vaccum
C.
air
D.
glass
Ans:
glass
Explanation :
T Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3; see Figure 1) and 200,000 kilometers per second in glass (refractive index of 1.5).
[16] is the cell organelle, in which the biochemical processes of respiration and energy production occur.
A.
Mitochondria
B.
Chloroplast
C.
Ribosomes
D.
Nucleus
Ans:
Mitochondria
Explanation :
Mitochondria is an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
[17] Amount of water vapour in a unit volume (Cubic metre) of air is called:
A.
Mixed ratio
B.
relative humidity
C.
absolute humidity
D.
specific humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] Which waves cannot be transmitted through vacuum -
A.
Light
B.
Heat
C.
Sound
D.
Electromagnetic
Ans:
Sound
Explanation :
Sound waves cannot be transmitted through vacuum. It is transmitted by the movement of particles along with the direction of the motion of the sound wave. More generally, sound is a mechanical disturbance which is dependent upon a medium to travel.
[19] Super cooling stands for cooling of a liquid –
A.
at freezing point
B.
below freezing point
C.
at melting point
D.
above melting point
Ans:
below freezing point
Explanation :
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.
[20] Alcohol is more volatile than water because is lower than water.
A.
its boiling point
B.
its density
C.
its viscosity
D.
its surface tension
Ans:
its boiling point
Explanation :
Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pres-sure and a lower boiling point than water; therefore, it evaporates more quickly. Its low boiling point of 78° C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.
[21] The boiling point of water depends upon the –
A.
atmospheric pressure
B.
volume
C.
density
D.
mass
Ans:
atmospheric pressure
Explanation :
The boiling point corresponds of water to the temperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on the atmospheric pressure. For example, at higher altitudes, the atmospheric pressure decreases. As this pressure decreases, the boiling point of the water also decreases.
[22] The loudness of sound depends upon .
A.
Velocity
B.
Pitch
C.
Amplitude
D.
Wavelength
Ans:
Wavelength
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[23] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[24] Who among the following is the scalar quantity .
A.
force
B.
pressure
C.
velocity
D.
acceleration
Ans:
pressure
Explanation :
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
[25] When net torque is zero, will be constant -
A.
force
B.
angular momentum
C.
linear momentum
D.
acceleration
Ans:
angular momentum
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Explanation :
T Light travels at approximately 300,000 kilometers per second in a vacuum, which has a refractive index of 1.0, but it slows down to 225,000 kilometers per second in water (refractive index = 1.3; see Figure 1) and 200,000 kilometers per second in glass (refractive index of 1.5).
[16] is the cell organelle, in which the biochemical processes of respiration and energy production occur.
A.
Mitochondria
B.
Chloroplast
C.
Ribosomes
D.
Nucleus
Ans:
Mitochondria
Explanation :
Mitochondria is an organelle found in large numbers in most cells, in which the biochemical processes of respiration and energy production occur.
[17] Amount of water vapour in a unit volume (Cubic metre) of air is called:
A.
Mixed ratio
B.
relative humidity
C.
absolute humidity
D.
specific humidity
Ans:
absolute humidity
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] Which waves cannot be transmitted through vacuum -
A.
Light
B.
Heat
C.
Sound
D.
Electromagnetic
Ans:
Sound
Explanation :
Sound waves cannot be transmitted through vacuum. It is transmitted by the movement of particles along with the direction of the motion of the sound wave. More generally, sound is a mechanical disturbance which is dependent upon a medium to travel.
[19] Super cooling stands for cooling of a liquid –
A.
at freezing point
B.
below freezing point
C.
at melting point
D.
above melting point
Ans:
below freezing point
Explanation :
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.
[20] Alcohol is more volatile than water because is lower than water.
A.
its boiling point
B.
its density
C.
its viscosity
D.
its surface tension
Ans:
its boiling point
Explanation :
Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pres-sure and a lower boiling point than water; therefore, it evaporates more quickly. Its low boiling point of 78° C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.
[21] The boiling point of water depends upon the –
A.
atmospheric pressure
B.
volume
C.
density
D.
mass
Ans:
atmospheric pressure
Explanation :
The boiling point corresponds of water to the temperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on the atmospheric pressure. For example, at higher altitudes, the atmospheric pressure decreases. As this pressure decreases, the boiling point of the water also decreases.
[22] The loudness of sound depends upon .
A.
Velocity
B.
Pitch
C.
Amplitude
D.
Wavelength
Ans:
Wavelength
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[23] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[24] Who among the following is the scalar quantity .
A.
force
B.
pressure
C.
velocity
D.
acceleration
Ans:
pressure
Explanation :
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
[25] When net torque is zero, will be constant -
A.
force
B.
angular momentum
C.
linear momentum
D.
acceleration
Ans:
angular momentum
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Explanation :
Absolute humidity is the measure of water vapor (moisture) in the air, regardless of temperature. It is expressed as grams of moisture per cubic meter of air (g/m3).
[18] Which waves cannot be transmitted through vacuum -
A.
Light
B.
Heat
C.
Sound
D.
Electromagnetic
Ans:
Sound
Explanation :
Sound waves cannot be transmitted through vacuum. It is transmitted by the movement of particles along with the direction of the motion of the sound wave. More generally, sound is a mechanical disturbance which is dependent upon a medium to travel.
[19] Super cooling stands for cooling of a liquid –
A.
at freezing point
B.
below freezing point
C.
at melting point
D.
above melting point
Ans:
below freezing point
Explanation :
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.
[20] Alcohol is more volatile than water because is lower than water.
A.
its boiling point
B.
its density
C.
its viscosity
D.
its surface tension
Ans:
its boiling point
Explanation :
Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pres-sure and a lower boiling point than water; therefore, it evaporates more quickly. Its low boiling point of 78° C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.
[21] The boiling point of water depends upon the –
A.
atmospheric pressure
B.
volume
C.
density
D.
mass
Ans:
atmospheric pressure
Explanation :
The boiling point corresponds of water to the temperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on the atmospheric pressure. For example, at higher altitudes, the atmospheric pressure decreases. As this pressure decreases, the boiling point of the water also decreases.
[22] The loudness of sound depends upon .
A.
Velocity
B.
Pitch
C.
Amplitude
D.
Wavelength
Ans:
Wavelength
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[23] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[24] Who among the following is the scalar quantity .
A.
force
B.
pressure
C.
velocity
D.
acceleration
Ans:
pressure
Explanation :
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
[25] When net torque is zero, will be constant -
A.
force
B.
angular momentum
C.
linear momentum
D.
acceleration
Ans:
angular momentum
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Explanation :
Supercooling, also known as undercooling, is the process of lowering the temperature of a liquid or a gas below its freezing point without it becoming a solid. A good example of this phenomenon is clouds in high altitude that are an accumulation of supercooled droplets of water below their freezing point. Refrigeration is a popular commercial application of supercooling.
[20] Alcohol is more volatile than water because is lower than water.
A.
its boiling point
B.
its density
C.
its viscosity
D.
its surface tension
Ans:
its boiling point
Explanation :
Drinking alcohol (ethanol) and a lot of other simple alcohols are more volatile than water because they are less polar. Thus, alcohol has higher vapor pres-sure and a lower boiling point than water; therefore, it evaporates more quickly. Its low boiling point of 78° C is what makes it possible to distill alcohol into a much stronger solution than wine or beer.
[21] The boiling point of water depends upon the –
A.
atmospheric pressure
B.
volume
C.
density
D.
mass
Ans:
atmospheric pressure
Explanation :
The boiling point corresponds of water to the temperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on the atmospheric pressure. For example, at higher altitudes, the atmospheric pressure decreases. As this pressure decreases, the boiling point of the water also decreases.
[22] The loudness of sound depends upon .
A.
Velocity
B.
Pitch
C.
Amplitude
D.
Wavelength
Ans:
Wavelength
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[23] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[24] Who among the following is the scalar quantity .
A.
force
B.
pressure
C.
velocity
D.
acceleration
Ans:
pressure
Explanation :
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
[25] When net torque is zero, will be constant -
A.
force
B.
angular momentum
C.
linear momentum
D.
acceleration
Ans:
angular momentum
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Explanation :
The boiling point corresponds of water to the temperature at which its vapour pressure equals the surrounding environmental pressure. So it is dependent on the atmospheric pressure. For example, at higher altitudes, the atmospheric pressure decreases. As this pressure decreases, the boiling point of the water also decreases.
[22] The loudness of sound depends upon .
A.
Velocity
B.
Pitch
C.
Amplitude
D.
Wavelength
Ans:
Wavelength
Explanation :
Loudness depends on the amplitude of the sound wave. The larger the amplitude the more energy the sound wave contains therefore the louder the sound. The pitch of a note depends on the frequency of the source of the sound.
[23] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[24] Who among the following is the scalar quantity .
A.
force
B.
pressure
C.
velocity
D.
acceleration
Ans:
pressure
Explanation :
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
[25] When net torque is zero, will be constant -
A.
force
B.
angular momentum
C.
linear momentum
D.
acceleration
Ans:
angular momentum
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Explanation :
Principle of conservation of linear momentum states If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[24] Who among the following is the scalar quantity .
A.
force
B.
pressure
C.
velocity
D.
acceleration
Ans:
pressure
Explanation :
Pressure is a scalar quantity. It relates the vector surface element with the normal force acting on it.
[25] When net torque is zero, will be constant -
A.
force
B.
angular momentum
C.
linear momentum
D.
acceleration
Ans:
angular momentum
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.
Explanation :
Since a torque (rate of change of angular momentum analogous to force) applied over time is equivalent to a change in angular momentum, then if torque is zero, angular momentum is constant.