[1] Hydro-electric power is a:
A.
non-renewable natural resource
B.
a mixture of renewable and non-renewable natural resource
C.
neither renewable nor non renewable resource
D.
renewable natural resource
Ans:
renewable natural resource
Explanation :
Hydro-electric power is a renewable natural resource.
[2] The electric motor converts -
A.
Electrical energy into mechanical energy
B.
Mechanical energy into electrical energy
C.
Electrical energy into light energy
D.
None of these
Ans:
Electrical energy into mechanical energy
Explanation :
A generator converts mechanical energy into electrical energy, while a motor does the opposite - it converts electrical energy into mechanical energy.
[3] Burns caused by steam are much severe than those caused by boiling water because –
A.
Steam pierces through the pores of body quickly
B.
Steam has latent heat
C.
Steam is gas and engulfs the body quickly
D.
Temperature of steam is higher
Ans:
Steam has latent heat
Explanation :
When water changes into steam, it absorbs latent heat, and when steam condenses to form water, it gives out an equal amount of latent heat. Bums caused by steam are much more severe than those caused by boiling water, simply because steam contains more heat (in the form of latent heat) than boiling water.
[4] According to special theory of relativity the mass of a particle –
A.
increases with increase in velocity with respect to an observer.
B.
decreases with increase in velocity.
C.
decreases with decrease in velocity.
D.
is independent of its velocity.
Ans:
increases with increase in velocity with respect to an observer.
Explanation :
According to the Special Theory of Relativity, the mass of a moving object measures more as its velocity increases until, at the speed of light, it becomes infinite. This is because as an object gains speed, it gains more (kinetic) energy.
[5] Vegetables are cooked in lesser time by adding a pinch of salt while cooking because –
A.
boiling point of water increases
B.
latent heat of vaporization of water decreases
C.
latent heat of vaporization of water increases
D.
boiling point of water decreases
Ans:
boiling point of water increases
Explanation :
Adding salt raises the boiling point of water, which allows food to cook at higher temperature. The higher the temperature, the higher the rate of heat transfer between the food and water, thus it cooks more quickly.
[6] A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct?
A.
Both the spheres will reach the ground simultaneously.
B.
A will reach the ground first.
C.
B will reach the ground first.
D.
The question is incomplete because the masses of the spheres are not given.
Ans:
Both the spheres will reach the ground simultaneously.
Explanation :
If no air resistance is present, the rate of descent depends only on how far the object has fallen, no matter how heavy the object is. This means that two objects will reach the ground at the same time if they are dropped simultaneously from the same height.
[7] The wavelength at which the peak of intensity of blackbody radiation Occurs –
A.
increases with increase in temperature
B.
decreases with increase in temperature
C.
is the same at all temperatures
D.
does not follow any pattern as temperature changes
Ans:
decreases with increase in temperature
Explanation :
According to Wien's displacement law, when the temperature of a blackbody radiator increases, the overall radiated energy increases. Wavelength of maximum emission from a blackbody is inversely proportional to its temperature. Shorter-wavelength (higher-frequency) light corresponds to higher- energy photons.
[8] A dynamo converts .
A.
Mechanical energy into sound energy
B.
Mechanical energy into electrical energy
C.
Electrical energy into mechanical energy
D.
None of these
Ans:
Mechanical energy into electrical energy
Explanation :
Explanation The dynamo, by attaching it in between the two tires, converts the mechanical energy (which of course, is produced by paddling) into electrical energy, and by connecting the wires going out of the dynamo to light, it glows without any flaw.
[9] If we want to calculate the pressure of a liquid at the bottom of a vessel, the quantity which is not required to determine it, is –
A.
Height of the liquid column
B.
Surface area of the bottom of the vessel
C.
Density of the liquid
D.
Acceleration due to gravity at the bottom of the vessel
Ans:
Surface area of the bottom of the vessel
Explanation :
The pressure exerted by a static fluid depends only upon the depth of the fluid, the density of the fluid, and the acceleration of gravity. Static fluid pressure does not depend on the shape, total mass, or surface area of the liquid.
[10] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[11] What is the relation between wavelength, frequency and velocity?
A.
velocity of wave = frequency * wavelength
B.
velocity of wave = frequency/wavelength
C.
velocity of wave = wavelength/frequency
D.
None of above
Ans:
velocity of wave = frequency * wavelength
Explanation :
0
[12] Ozone layer in the outer atmosphere helps us in –
A.
reflecting radio waves and makes radio communication possible
B.
regulating he temperature of atmosphere
C.
absorbing cosmic ray particles
D.
absorbing U-V radiations
Ans:
absorbing U-V radiations
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03) which absorbs 97-99% of the Sun's medium-frequency ultraviolet light.
[13] Stationary wave is formed by –
A.
a transverse wave superposing a longitudinal wave
B.
two waves of the same speed superposing
C.
two waves of same frequency travelling in the same direction
D.
two waves of same frequency travelling in the opposite direction
Ans:
two waves of same frequency travelling in the opposite direction
Explanation :
Stationary or standing waves are formed in a medium when two waves having equal amplitude and frequency moving in opposite directions along the same line, interfere in a confined space. Generally, such waves are formed by the superposition of a forward wave and the reflected wave. Both longitudinal and transverse types of waves can form a stationary wave.
[14] What is inertia?
A.
Tendency to resist change in the current state
B.
Tendency to impart acceleration to a body
C.
Tendency to bring a body to rest
D.
Tendency to change its current state
Ans:
Tendency to resist change in the current state
Explanation :
[15] A good conductor while carrying current is -
A.
alternately charged positive and negative
B.
negatively charged
C.
positively charged
D.
electrically neutral
Ans:
negatively charged
Explanation :
Electrons carry current in a good conductor of electricity and they are negatively charged. This makes a good electrical conductor negatively charged.
[16] The propagation of sound waves in a gas involves –
A.
Adiabatic compression and rarefaction
B.
Isothermal compression and rarefaction
C.
Isochoric compression and rarefaction
D.
Isobaric compression and rarefaction
Ans:
Adiabatic compression and rarefaction
Explanation :
Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing. During propagation, waves can be reflected, refracted, or attenuated by the medium. Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves.
[17] We always see the same lace of the moon, because –
A.
It is smaller than the earth
B.
It revolves on its axis in a direction opposite to that of the earth
C.
It takes equal time for revolution around the earth and rotation on its own axis
D.
It rotates at the same speed as the earth around the sun
Ans:
It takes equal time for revolution around the earth and rotation on its own axis
Explanation :
It is tidal locking that causes the synchronous rotation which causes the Moon to present "just one side" to the Earth all the time. The Moon rotates (spins) but very slowly, making one turn on its axis in the same time it takes to revolve (orbit) around the Earth. So it maintains a "constant face" in our direction.
[18] Which of the following events occurred first?
A.
Albert Einstein propounded the General Theory of Relativity
B.
Max Planck unveiled the Quantum Theory
C.
Marconi first transmitted a wireless signal
D.
Madame Marie Curie became the first woman Nobel Prize winner
Ans:
Max Planck unveiled the Quantum Theory
Explanation :
General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907-1915; Quantum Theory of Max Planck: 1900; Transmission of wireless signal by Marconi: first Atlantic wireless transmission on December 11, 1901; and Madame Curie becoming the first woman Nobel Prize winner: shared her 1903 Nobel Prize in Physics with her husband Pierre Curie.
[19] The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because -
A.
the ringing is not loud enough
B.
the glass of the bell jar absorbs the sound waves
C.
the bell jar is too small
D.
there is no air or any other gas in the bell jar
Ans:
there is no air or any other gas in the bell jar
Explanation :
[20] At hill stations, the boiling point of water will be –
A.
same as at sea level
B.
less than that at sea level
C.
more than that at sea level
D.
equal to the melting point of ice
Ans:
less than that at sea level
Explanation :
The boiling point is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid. Atmospheric pressure is due to air above any given point. The atmospheric pressure at high altitudes like hill station is less than at the sea level.
[21] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[22] Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
A.
Microwave, infrared, visible. X-rays
B.
X-rays, visible, infrared, microwave
C.
Visible, infrared, microwave, X-rays
D.
X-rays, infrared, visible, microwave
Ans:
X-rays, infrared, visible, microwave
Explanation :
The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rays-wavelength: 0.01 nm ; X-rays -1 nm ; Ultra-violet Rays-0.1 micrometres ; Visible Light-Red light : 0.7 micrometres, Violet Light : 0.4 micrometres ; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm, usually lem ; Radiowaves- Long, Medium and Short Waves : 1am-10 m ; and Very High Frequency (VHF) and Ultra High Frequency (UHF): 10 m-10 cm.
[23] A black body can absorb radiations of ;
A.
lower wavelengths only
B.
intermediate wavelengths only
C.
higher wavelengths only
D.
all wavelengths
Ans:
all wavelengths
Explanation :
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
[24] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[25] When hot liquid is poured into a thick glass tumbler, it cracks because glass –
A.
is a bad conductor of heat so only inner surface expands
B.
has high temperature coefficient of expansion
C.
has a very low specific heat
D.
has low temperature coefficient of expansion
Ans:
is a bad conductor of heat so only inner surface expands
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Explanation :
Hydro-electric power is a renewable natural resource.
[2] The electric motor converts -
A.
Electrical energy into mechanical energy
B.
Mechanical energy into electrical energy
C.
Electrical energy into light energy
D.
None of these
Ans:
Electrical energy into mechanical energy
Explanation :
A generator converts mechanical energy into electrical energy, while a motor does the opposite - it converts electrical energy into mechanical energy.
[3] Burns caused by steam are much severe than those caused by boiling water because –
A.
Steam pierces through the pores of body quickly
B.
Steam has latent heat
C.
Steam is gas and engulfs the body quickly
D.
Temperature of steam is higher
Ans:
Steam has latent heat
Explanation :
When water changes into steam, it absorbs latent heat, and when steam condenses to form water, it gives out an equal amount of latent heat. Bums caused by steam are much more severe than those caused by boiling water, simply because steam contains more heat (in the form of latent heat) than boiling water.
[4] According to special theory of relativity the mass of a particle –
A.
increases with increase in velocity with respect to an observer.
B.
decreases with increase in velocity.
C.
decreases with decrease in velocity.
D.
is independent of its velocity.
Ans:
increases with increase in velocity with respect to an observer.
Explanation :
According to the Special Theory of Relativity, the mass of a moving object measures more as its velocity increases until, at the speed of light, it becomes infinite. This is because as an object gains speed, it gains more (kinetic) energy.
[5] Vegetables are cooked in lesser time by adding a pinch of salt while cooking because –
A.
boiling point of water increases
B.
latent heat of vaporization of water decreases
C.
latent heat of vaporization of water increases
D.
boiling point of water decreases
Ans:
boiling point of water increases
Explanation :
Adding salt raises the boiling point of water, which allows food to cook at higher temperature. The higher the temperature, the higher the rate of heat transfer between the food and water, thus it cooks more quickly.
[6] A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct?
A.
Both the spheres will reach the ground simultaneously.
B.
A will reach the ground first.
C.
B will reach the ground first.
D.
The question is incomplete because the masses of the spheres are not given.
Ans:
Both the spheres will reach the ground simultaneously.
Explanation :
If no air resistance is present, the rate of descent depends only on how far the object has fallen, no matter how heavy the object is. This means that two objects will reach the ground at the same time if they are dropped simultaneously from the same height.
[7] The wavelength at which the peak of intensity of blackbody radiation Occurs –
A.
increases with increase in temperature
B.
decreases with increase in temperature
C.
is the same at all temperatures
D.
does not follow any pattern as temperature changes
Ans:
decreases with increase in temperature
Explanation :
According to Wien's displacement law, when the temperature of a blackbody radiator increases, the overall radiated energy increases. Wavelength of maximum emission from a blackbody is inversely proportional to its temperature. Shorter-wavelength (higher-frequency) light corresponds to higher- energy photons.
[8] A dynamo converts .
A.
Mechanical energy into sound energy
B.
Mechanical energy into electrical energy
C.
Electrical energy into mechanical energy
D.
None of these
Ans:
Mechanical energy into electrical energy
Explanation :
Explanation The dynamo, by attaching it in between the two tires, converts the mechanical energy (which of course, is produced by paddling) into electrical energy, and by connecting the wires going out of the dynamo to light, it glows without any flaw.
[9] If we want to calculate the pressure of a liquid at the bottom of a vessel, the quantity which is not required to determine it, is –
A.
Height of the liquid column
B.
Surface area of the bottom of the vessel
C.
Density of the liquid
D.
Acceleration due to gravity at the bottom of the vessel
Ans:
Surface area of the bottom of the vessel
Explanation :
The pressure exerted by a static fluid depends only upon the depth of the fluid, the density of the fluid, and the acceleration of gravity. Static fluid pressure does not depend on the shape, total mass, or surface area of the liquid.
[10] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[11] What is the relation between wavelength, frequency and velocity?
A.
velocity of wave = frequency * wavelength
B.
velocity of wave = frequency/wavelength
C.
velocity of wave = wavelength/frequency
D.
None of above
Ans:
velocity of wave = frequency * wavelength
Explanation :
0
[12] Ozone layer in the outer atmosphere helps us in –
A.
reflecting radio waves and makes radio communication possible
B.
regulating he temperature of atmosphere
C.
absorbing cosmic ray particles
D.
absorbing U-V radiations
Ans:
absorbing U-V radiations
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03) which absorbs 97-99% of the Sun's medium-frequency ultraviolet light.
[13] Stationary wave is formed by –
A.
a transverse wave superposing a longitudinal wave
B.
two waves of the same speed superposing
C.
two waves of same frequency travelling in the same direction
D.
two waves of same frequency travelling in the opposite direction
Ans:
two waves of same frequency travelling in the opposite direction
Explanation :
Stationary or standing waves are formed in a medium when two waves having equal amplitude and frequency moving in opposite directions along the same line, interfere in a confined space. Generally, such waves are formed by the superposition of a forward wave and the reflected wave. Both longitudinal and transverse types of waves can form a stationary wave.
[14] What is inertia?
A.
Tendency to resist change in the current state
B.
Tendency to impart acceleration to a body
C.
Tendency to bring a body to rest
D.
Tendency to change its current state
Ans:
Tendency to resist change in the current state
Explanation :
[15] A good conductor while carrying current is -
A.
alternately charged positive and negative
B.
negatively charged
C.
positively charged
D.
electrically neutral
Ans:
negatively charged
Explanation :
Electrons carry current in a good conductor of electricity and they are negatively charged. This makes a good electrical conductor negatively charged.
[16] The propagation of sound waves in a gas involves –
A.
Adiabatic compression and rarefaction
B.
Isothermal compression and rarefaction
C.
Isochoric compression and rarefaction
D.
Isobaric compression and rarefaction
Ans:
Adiabatic compression and rarefaction
Explanation :
Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing. During propagation, waves can be reflected, refracted, or attenuated by the medium. Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves.
[17] We always see the same lace of the moon, because –
A.
It is smaller than the earth
B.
It revolves on its axis in a direction opposite to that of the earth
C.
It takes equal time for revolution around the earth and rotation on its own axis
D.
It rotates at the same speed as the earth around the sun
Ans:
It takes equal time for revolution around the earth and rotation on its own axis
Explanation :
It is tidal locking that causes the synchronous rotation which causes the Moon to present "just one side" to the Earth all the time. The Moon rotates (spins) but very slowly, making one turn on its axis in the same time it takes to revolve (orbit) around the Earth. So it maintains a "constant face" in our direction.
[18] Which of the following events occurred first?
A.
Albert Einstein propounded the General Theory of Relativity
B.
Max Planck unveiled the Quantum Theory
C.
Marconi first transmitted a wireless signal
D.
Madame Marie Curie became the first woman Nobel Prize winner
Ans:
Max Planck unveiled the Quantum Theory
Explanation :
General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907-1915; Quantum Theory of Max Planck: 1900; Transmission of wireless signal by Marconi: first Atlantic wireless transmission on December 11, 1901; and Madame Curie becoming the first woman Nobel Prize winner: shared her 1903 Nobel Prize in Physics with her husband Pierre Curie.
[19] The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because -
A.
the ringing is not loud enough
B.
the glass of the bell jar absorbs the sound waves
C.
the bell jar is too small
D.
there is no air or any other gas in the bell jar
Ans:
there is no air or any other gas in the bell jar
Explanation :
[20] At hill stations, the boiling point of water will be –
A.
same as at sea level
B.
less than that at sea level
C.
more than that at sea level
D.
equal to the melting point of ice
Ans:
less than that at sea level
Explanation :
The boiling point is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid. Atmospheric pressure is due to air above any given point. The atmospheric pressure at high altitudes like hill station is less than at the sea level.
[21] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[22] Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
A.
Microwave, infrared, visible. X-rays
B.
X-rays, visible, infrared, microwave
C.
Visible, infrared, microwave, X-rays
D.
X-rays, infrared, visible, microwave
Ans:
X-rays, infrared, visible, microwave
Explanation :
The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rays-wavelength: 0.01 nm ; X-rays -1 nm ; Ultra-violet Rays-0.1 micrometres ; Visible Light-Red light : 0.7 micrometres, Violet Light : 0.4 micrometres ; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm, usually lem ; Radiowaves- Long, Medium and Short Waves : 1am-10 m ; and Very High Frequency (VHF) and Ultra High Frequency (UHF): 10 m-10 cm.
[23] A black body can absorb radiations of ;
A.
lower wavelengths only
B.
intermediate wavelengths only
C.
higher wavelengths only
D.
all wavelengths
Ans:
all wavelengths
Explanation :
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
[24] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[25] When hot liquid is poured into a thick glass tumbler, it cracks because glass –
A.
is a bad conductor of heat so only inner surface expands
B.
has high temperature coefficient of expansion
C.
has a very low specific heat
D.
has low temperature coefficient of expansion
Ans:
is a bad conductor of heat so only inner surface expands
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Explanation :
When water changes into steam, it absorbs latent heat, and when steam condenses to form water, it gives out an equal amount of latent heat. Bums caused by steam are much more severe than those caused by boiling water, simply because steam contains more heat (in the form of latent heat) than boiling water.
[4] According to special theory of relativity the mass of a particle –
A.
increases with increase in velocity with respect to an observer.
B.
decreases with increase in velocity.
C.
decreases with decrease in velocity.
D.
is independent of its velocity.
Ans:
increases with increase in velocity with respect to an observer.
Explanation :
According to the Special Theory of Relativity, the mass of a moving object measures more as its velocity increases until, at the speed of light, it becomes infinite. This is because as an object gains speed, it gains more (kinetic) energy.
[5] Vegetables are cooked in lesser time by adding a pinch of salt while cooking because –
A.
boiling point of water increases
B.
latent heat of vaporization of water decreases
C.
latent heat of vaporization of water increases
D.
boiling point of water decreases
Ans:
boiling point of water increases
Explanation :
Adding salt raises the boiling point of water, which allows food to cook at higher temperature. The higher the temperature, the higher the rate of heat transfer between the food and water, thus it cooks more quickly.
[6] A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct?
A.
Both the spheres will reach the ground simultaneously.
B.
A will reach the ground first.
C.
B will reach the ground first.
D.
The question is incomplete because the masses of the spheres are not given.
Ans:
Both the spheres will reach the ground simultaneously.
Explanation :
If no air resistance is present, the rate of descent depends only on how far the object has fallen, no matter how heavy the object is. This means that two objects will reach the ground at the same time if they are dropped simultaneously from the same height.
[7] The wavelength at which the peak of intensity of blackbody radiation Occurs –
A.
increases with increase in temperature
B.
decreases with increase in temperature
C.
is the same at all temperatures
D.
does not follow any pattern as temperature changes
Ans:
decreases with increase in temperature
Explanation :
According to Wien's displacement law, when the temperature of a blackbody radiator increases, the overall radiated energy increases. Wavelength of maximum emission from a blackbody is inversely proportional to its temperature. Shorter-wavelength (higher-frequency) light corresponds to higher- energy photons.
[8] A dynamo converts .
A.
Mechanical energy into sound energy
B.
Mechanical energy into electrical energy
C.
Electrical energy into mechanical energy
D.
None of these
Ans:
Mechanical energy into electrical energy
Explanation :
Explanation The dynamo, by attaching it in between the two tires, converts the mechanical energy (which of course, is produced by paddling) into electrical energy, and by connecting the wires going out of the dynamo to light, it glows without any flaw.
[9] If we want to calculate the pressure of a liquid at the bottom of a vessel, the quantity which is not required to determine it, is –
A.
Height of the liquid column
B.
Surface area of the bottom of the vessel
C.
Density of the liquid
D.
Acceleration due to gravity at the bottom of the vessel
Ans:
Surface area of the bottom of the vessel
Explanation :
The pressure exerted by a static fluid depends only upon the depth of the fluid, the density of the fluid, and the acceleration of gravity. Static fluid pressure does not depend on the shape, total mass, or surface area of the liquid.
[10] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[11] What is the relation between wavelength, frequency and velocity?
A.
velocity of wave = frequency * wavelength
B.
velocity of wave = frequency/wavelength
C.
velocity of wave = wavelength/frequency
D.
None of above
Ans:
velocity of wave = frequency * wavelength
Explanation :
0
[12] Ozone layer in the outer atmosphere helps us in –
A.
reflecting radio waves and makes radio communication possible
B.
regulating he temperature of atmosphere
C.
absorbing cosmic ray particles
D.
absorbing U-V radiations
Ans:
absorbing U-V radiations
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03) which absorbs 97-99% of the Sun's medium-frequency ultraviolet light.
[13] Stationary wave is formed by –
A.
a transverse wave superposing a longitudinal wave
B.
two waves of the same speed superposing
C.
two waves of same frequency travelling in the same direction
D.
two waves of same frequency travelling in the opposite direction
Ans:
two waves of same frequency travelling in the opposite direction
Explanation :
Stationary or standing waves are formed in a medium when two waves having equal amplitude and frequency moving in opposite directions along the same line, interfere in a confined space. Generally, such waves are formed by the superposition of a forward wave and the reflected wave. Both longitudinal and transverse types of waves can form a stationary wave.
[14] What is inertia?
A.
Tendency to resist change in the current state
B.
Tendency to impart acceleration to a body
C.
Tendency to bring a body to rest
D.
Tendency to change its current state
Ans:
Tendency to resist change in the current state
Explanation :
[15] A good conductor while carrying current is -
A.
alternately charged positive and negative
B.
negatively charged
C.
positively charged
D.
electrically neutral
Ans:
negatively charged
Explanation :
Electrons carry current in a good conductor of electricity and they are negatively charged. This makes a good electrical conductor negatively charged.
[16] The propagation of sound waves in a gas involves –
A.
Adiabatic compression and rarefaction
B.
Isothermal compression and rarefaction
C.
Isochoric compression and rarefaction
D.
Isobaric compression and rarefaction
Ans:
Adiabatic compression and rarefaction
Explanation :
Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing. During propagation, waves can be reflected, refracted, or attenuated by the medium. Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves.
[17] We always see the same lace of the moon, because –
A.
It is smaller than the earth
B.
It revolves on its axis in a direction opposite to that of the earth
C.
It takes equal time for revolution around the earth and rotation on its own axis
D.
It rotates at the same speed as the earth around the sun
Ans:
It takes equal time for revolution around the earth and rotation on its own axis
Explanation :
It is tidal locking that causes the synchronous rotation which causes the Moon to present "just one side" to the Earth all the time. The Moon rotates (spins) but very slowly, making one turn on its axis in the same time it takes to revolve (orbit) around the Earth. So it maintains a "constant face" in our direction.
[18] Which of the following events occurred first?
A.
Albert Einstein propounded the General Theory of Relativity
B.
Max Planck unveiled the Quantum Theory
C.
Marconi first transmitted a wireless signal
D.
Madame Marie Curie became the first woman Nobel Prize winner
Ans:
Max Planck unveiled the Quantum Theory
Explanation :
General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907-1915; Quantum Theory of Max Planck: 1900; Transmission of wireless signal by Marconi: first Atlantic wireless transmission on December 11, 1901; and Madame Curie becoming the first woman Nobel Prize winner: shared her 1903 Nobel Prize in Physics with her husband Pierre Curie.
[19] The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because -
A.
the ringing is not loud enough
B.
the glass of the bell jar absorbs the sound waves
C.
the bell jar is too small
D.
there is no air or any other gas in the bell jar
Ans:
there is no air or any other gas in the bell jar
Explanation :
[20] At hill stations, the boiling point of water will be –
A.
same as at sea level
B.
less than that at sea level
C.
more than that at sea level
D.
equal to the melting point of ice
Ans:
less than that at sea level
Explanation :
The boiling point is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid. Atmospheric pressure is due to air above any given point. The atmospheric pressure at high altitudes like hill station is less than at the sea level.
[21] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[22] Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
A.
Microwave, infrared, visible. X-rays
B.
X-rays, visible, infrared, microwave
C.
Visible, infrared, microwave, X-rays
D.
X-rays, infrared, visible, microwave
Ans:
X-rays, infrared, visible, microwave
Explanation :
The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rays-wavelength: 0.01 nm ; X-rays -1 nm ; Ultra-violet Rays-0.1 micrometres ; Visible Light-Red light : 0.7 micrometres, Violet Light : 0.4 micrometres ; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm, usually lem ; Radiowaves- Long, Medium and Short Waves : 1am-10 m ; and Very High Frequency (VHF) and Ultra High Frequency (UHF): 10 m-10 cm.
[23] A black body can absorb radiations of ;
A.
lower wavelengths only
B.
intermediate wavelengths only
C.
higher wavelengths only
D.
all wavelengths
Ans:
all wavelengths
Explanation :
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
[24] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[25] When hot liquid is poured into a thick glass tumbler, it cracks because glass –
A.
is a bad conductor of heat so only inner surface expands
B.
has high temperature coefficient of expansion
C.
has a very low specific heat
D.
has low temperature coefficient of expansion
Ans:
is a bad conductor of heat so only inner surface expands
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Explanation :
Adding salt raises the boiling point of water, which allows food to cook at higher temperature. The higher the temperature, the higher the rate of heat transfer between the food and water, thus it cooks more quickly.
[6] A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct?
A.
Both the spheres will reach the ground simultaneously.
B.
A will reach the ground first.
C.
B will reach the ground first.
D.
The question is incomplete because the masses of the spheres are not given.
Ans:
Both the spheres will reach the ground simultaneously.
Explanation :
If no air resistance is present, the rate of descent depends only on how far the object has fallen, no matter how heavy the object is. This means that two objects will reach the ground at the same time if they are dropped simultaneously from the same height.
[7] The wavelength at which the peak of intensity of blackbody radiation Occurs –
A.
increases with increase in temperature
B.
decreases with increase in temperature
C.
is the same at all temperatures
D.
does not follow any pattern as temperature changes
Ans:
decreases with increase in temperature
Explanation :
According to Wien's displacement law, when the temperature of a blackbody radiator increases, the overall radiated energy increases. Wavelength of maximum emission from a blackbody is inversely proportional to its temperature. Shorter-wavelength (higher-frequency) light corresponds to higher- energy photons.
[8] A dynamo converts .
A.
Mechanical energy into sound energy
B.
Mechanical energy into electrical energy
C.
Electrical energy into mechanical energy
D.
None of these
Ans:
Mechanical energy into electrical energy
Explanation :
Explanation The dynamo, by attaching it in between the two tires, converts the mechanical energy (which of course, is produced by paddling) into electrical energy, and by connecting the wires going out of the dynamo to light, it glows without any flaw.
[9] If we want to calculate the pressure of a liquid at the bottom of a vessel, the quantity which is not required to determine it, is –
A.
Height of the liquid column
B.
Surface area of the bottom of the vessel
C.
Density of the liquid
D.
Acceleration due to gravity at the bottom of the vessel
Ans:
Surface area of the bottom of the vessel
Explanation :
The pressure exerted by a static fluid depends only upon the depth of the fluid, the density of the fluid, and the acceleration of gravity. Static fluid pressure does not depend on the shape, total mass, or surface area of the liquid.
[10] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[11] What is the relation between wavelength, frequency and velocity?
A.
velocity of wave = frequency * wavelength
B.
velocity of wave = frequency/wavelength
C.
velocity of wave = wavelength/frequency
D.
None of above
Ans:
velocity of wave = frequency * wavelength
Explanation :
0
[12] Ozone layer in the outer atmosphere helps us in –
A.
reflecting radio waves and makes radio communication possible
B.
regulating he temperature of atmosphere
C.
absorbing cosmic ray particles
D.
absorbing U-V radiations
Ans:
absorbing U-V radiations
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03) which absorbs 97-99% of the Sun's medium-frequency ultraviolet light.
[13] Stationary wave is formed by –
A.
a transverse wave superposing a longitudinal wave
B.
two waves of the same speed superposing
C.
two waves of same frequency travelling in the same direction
D.
two waves of same frequency travelling in the opposite direction
Ans:
two waves of same frequency travelling in the opposite direction
Explanation :
Stationary or standing waves are formed in a medium when two waves having equal amplitude and frequency moving in opposite directions along the same line, interfere in a confined space. Generally, such waves are formed by the superposition of a forward wave and the reflected wave. Both longitudinal and transverse types of waves can form a stationary wave.
[14] What is inertia?
A.
Tendency to resist change in the current state
B.
Tendency to impart acceleration to a body
C.
Tendency to bring a body to rest
D.
Tendency to change its current state
Ans:
Tendency to resist change in the current state
Explanation :
[15] A good conductor while carrying current is -
A.
alternately charged positive and negative
B.
negatively charged
C.
positively charged
D.
electrically neutral
Ans:
negatively charged
Explanation :
Electrons carry current in a good conductor of electricity and they are negatively charged. This makes a good electrical conductor negatively charged.
[16] The propagation of sound waves in a gas involves –
A.
Adiabatic compression and rarefaction
B.
Isothermal compression and rarefaction
C.
Isochoric compression and rarefaction
D.
Isobaric compression and rarefaction
Ans:
Adiabatic compression and rarefaction
Explanation :
Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing. During propagation, waves can be reflected, refracted, or attenuated by the medium. Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves.
[17] We always see the same lace of the moon, because –
A.
It is smaller than the earth
B.
It revolves on its axis in a direction opposite to that of the earth
C.
It takes equal time for revolution around the earth and rotation on its own axis
D.
It rotates at the same speed as the earth around the sun
Ans:
It takes equal time for revolution around the earth and rotation on its own axis
Explanation :
It is tidal locking that causes the synchronous rotation which causes the Moon to present "just one side" to the Earth all the time. The Moon rotates (spins) but very slowly, making one turn on its axis in the same time it takes to revolve (orbit) around the Earth. So it maintains a "constant face" in our direction.
[18] Which of the following events occurred first?
A.
Albert Einstein propounded the General Theory of Relativity
B.
Max Planck unveiled the Quantum Theory
C.
Marconi first transmitted a wireless signal
D.
Madame Marie Curie became the first woman Nobel Prize winner
Ans:
Max Planck unveiled the Quantum Theory
Explanation :
General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907-1915; Quantum Theory of Max Planck: 1900; Transmission of wireless signal by Marconi: first Atlantic wireless transmission on December 11, 1901; and Madame Curie becoming the first woman Nobel Prize winner: shared her 1903 Nobel Prize in Physics with her husband Pierre Curie.
[19] The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because -
A.
the ringing is not loud enough
B.
the glass of the bell jar absorbs the sound waves
C.
the bell jar is too small
D.
there is no air or any other gas in the bell jar
Ans:
there is no air or any other gas in the bell jar
Explanation :
[20] At hill stations, the boiling point of water will be –
A.
same as at sea level
B.
less than that at sea level
C.
more than that at sea level
D.
equal to the melting point of ice
Ans:
less than that at sea level
Explanation :
The boiling point is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid. Atmospheric pressure is due to air above any given point. The atmospheric pressure at high altitudes like hill station is less than at the sea level.
[21] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[22] Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
A.
Microwave, infrared, visible. X-rays
B.
X-rays, visible, infrared, microwave
C.
Visible, infrared, microwave, X-rays
D.
X-rays, infrared, visible, microwave
Ans:
X-rays, infrared, visible, microwave
Explanation :
The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rays-wavelength: 0.01 nm ; X-rays -1 nm ; Ultra-violet Rays-0.1 micrometres ; Visible Light-Red light : 0.7 micrometres, Violet Light : 0.4 micrometres ; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm, usually lem ; Radiowaves- Long, Medium and Short Waves : 1am-10 m ; and Very High Frequency (VHF) and Ultra High Frequency (UHF): 10 m-10 cm.
[23] A black body can absorb radiations of ;
A.
lower wavelengths only
B.
intermediate wavelengths only
C.
higher wavelengths only
D.
all wavelengths
Ans:
all wavelengths
Explanation :
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
[24] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[25] When hot liquid is poured into a thick glass tumbler, it cracks because glass –
A.
is a bad conductor of heat so only inner surface expands
B.
has high temperature coefficient of expansion
C.
has a very low specific heat
D.
has low temperature coefficient of expansion
Ans:
is a bad conductor of heat so only inner surface expands
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Explanation :
According to Wien's displacement law, when the temperature of a blackbody radiator increases, the overall radiated energy increases. Wavelength of maximum emission from a blackbody is inversely proportional to its temperature. Shorter-wavelength (higher-frequency) light corresponds to higher- energy photons.
[8] A dynamo converts .
A.
Mechanical energy into sound energy
B.
Mechanical energy into electrical energy
C.
Electrical energy into mechanical energy
D.
None of these
Ans:
Mechanical energy into electrical energy
Explanation :
Explanation The dynamo, by attaching it in between the two tires, converts the mechanical energy (which of course, is produced by paddling) into electrical energy, and by connecting the wires going out of the dynamo to light, it glows without any flaw.
[9] If we want to calculate the pressure of a liquid at the bottom of a vessel, the quantity which is not required to determine it, is –
A.
Height of the liquid column
B.
Surface area of the bottom of the vessel
C.
Density of the liquid
D.
Acceleration due to gravity at the bottom of the vessel
Ans:
Surface area of the bottom of the vessel
Explanation :
The pressure exerted by a static fluid depends only upon the depth of the fluid, the density of the fluid, and the acceleration of gravity. Static fluid pressure does not depend on the shape, total mass, or surface area of the liquid.
[10] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[11] What is the relation between wavelength, frequency and velocity?
A.
velocity of wave = frequency * wavelength
B.
velocity of wave = frequency/wavelength
C.
velocity of wave = wavelength/frequency
D.
None of above
Ans:
velocity of wave = frequency * wavelength
Explanation :
0
[12] Ozone layer in the outer atmosphere helps us in –
A.
reflecting radio waves and makes radio communication possible
B.
regulating he temperature of atmosphere
C.
absorbing cosmic ray particles
D.
absorbing U-V radiations
Ans:
absorbing U-V radiations
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03) which absorbs 97-99% of the Sun's medium-frequency ultraviolet light.
[13] Stationary wave is formed by –
A.
a transverse wave superposing a longitudinal wave
B.
two waves of the same speed superposing
C.
two waves of same frequency travelling in the same direction
D.
two waves of same frequency travelling in the opposite direction
Ans:
two waves of same frequency travelling in the opposite direction
Explanation :
Stationary or standing waves are formed in a medium when two waves having equal amplitude and frequency moving in opposite directions along the same line, interfere in a confined space. Generally, such waves are formed by the superposition of a forward wave and the reflected wave. Both longitudinal and transverse types of waves can form a stationary wave.
[14] What is inertia?
A.
Tendency to resist change in the current state
B.
Tendency to impart acceleration to a body
C.
Tendency to bring a body to rest
D.
Tendency to change its current state
Ans:
Tendency to resist change in the current state
Explanation :
[15] A good conductor while carrying current is -
A.
alternately charged positive and negative
B.
negatively charged
C.
positively charged
D.
electrically neutral
Ans:
negatively charged
Explanation :
Electrons carry current in a good conductor of electricity and they are negatively charged. This makes a good electrical conductor negatively charged.
[16] The propagation of sound waves in a gas involves –
A.
Adiabatic compression and rarefaction
B.
Isothermal compression and rarefaction
C.
Isochoric compression and rarefaction
D.
Isobaric compression and rarefaction
Ans:
Adiabatic compression and rarefaction
Explanation :
Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing. During propagation, waves can be reflected, refracted, or attenuated by the medium. Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves.
[17] We always see the same lace of the moon, because –
A.
It is smaller than the earth
B.
It revolves on its axis in a direction opposite to that of the earth
C.
It takes equal time for revolution around the earth and rotation on its own axis
D.
It rotates at the same speed as the earth around the sun
Ans:
It takes equal time for revolution around the earth and rotation on its own axis
Explanation :
It is tidal locking that causes the synchronous rotation which causes the Moon to present "just one side" to the Earth all the time. The Moon rotates (spins) but very slowly, making one turn on its axis in the same time it takes to revolve (orbit) around the Earth. So it maintains a "constant face" in our direction.
[18] Which of the following events occurred first?
A.
Albert Einstein propounded the General Theory of Relativity
B.
Max Planck unveiled the Quantum Theory
C.
Marconi first transmitted a wireless signal
D.
Madame Marie Curie became the first woman Nobel Prize winner
Ans:
Max Planck unveiled the Quantum Theory
Explanation :
General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907-1915; Quantum Theory of Max Planck: 1900; Transmission of wireless signal by Marconi: first Atlantic wireless transmission on December 11, 1901; and Madame Curie becoming the first woman Nobel Prize winner: shared her 1903 Nobel Prize in Physics with her husband Pierre Curie.
[19] The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because -
A.
the ringing is not loud enough
B.
the glass of the bell jar absorbs the sound waves
C.
the bell jar is too small
D.
there is no air or any other gas in the bell jar
Ans:
there is no air or any other gas in the bell jar
Explanation :
[20] At hill stations, the boiling point of water will be –
A.
same as at sea level
B.
less than that at sea level
C.
more than that at sea level
D.
equal to the melting point of ice
Ans:
less than that at sea level
Explanation :
The boiling point is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid. Atmospheric pressure is due to air above any given point. The atmospheric pressure at high altitudes like hill station is less than at the sea level.
[21] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[22] Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
A.
Microwave, infrared, visible. X-rays
B.
X-rays, visible, infrared, microwave
C.
Visible, infrared, microwave, X-rays
D.
X-rays, infrared, visible, microwave
Ans:
X-rays, infrared, visible, microwave
Explanation :
The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rays-wavelength: 0.01 nm ; X-rays -1 nm ; Ultra-violet Rays-0.1 micrometres ; Visible Light-Red light : 0.7 micrometres, Violet Light : 0.4 micrometres ; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm, usually lem ; Radiowaves- Long, Medium and Short Waves : 1am-10 m ; and Very High Frequency (VHF) and Ultra High Frequency (UHF): 10 m-10 cm.
[23] A black body can absorb radiations of ;
A.
lower wavelengths only
B.
intermediate wavelengths only
C.
higher wavelengths only
D.
all wavelengths
Ans:
all wavelengths
Explanation :
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
[24] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[25] When hot liquid is poured into a thick glass tumbler, it cracks because glass –
A.
is a bad conductor of heat so only inner surface expands
B.
has high temperature coefficient of expansion
C.
has a very low specific heat
D.
has low temperature coefficient of expansion
Ans:
is a bad conductor of heat so only inner surface expands
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Explanation :
The pressure exerted by a static fluid depends only upon the depth of the fluid, the density of the fluid, and the acceleration of gravity. Static fluid pressure does not depend on the shape, total mass, or surface area of the liquid.
[10] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[11] What is the relation between wavelength, frequency and velocity?
A.
velocity of wave = frequency * wavelength
B.
velocity of wave = frequency/wavelength
C.
velocity of wave = wavelength/frequency
D.
None of above
Ans:
velocity of wave = frequency * wavelength
Explanation :
0
[12] Ozone layer in the outer atmosphere helps us in –
A.
reflecting radio waves and makes radio communication possible
B.
regulating he temperature of atmosphere
C.
absorbing cosmic ray particles
D.
absorbing U-V radiations
Ans:
absorbing U-V radiations
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03) which absorbs 97-99% of the Sun's medium-frequency ultraviolet light.
[13] Stationary wave is formed by –
A.
a transverse wave superposing a longitudinal wave
B.
two waves of the same speed superposing
C.
two waves of same frequency travelling in the same direction
D.
two waves of same frequency travelling in the opposite direction
Ans:
two waves of same frequency travelling in the opposite direction
Explanation :
Stationary or standing waves are formed in a medium when two waves having equal amplitude and frequency moving in opposite directions along the same line, interfere in a confined space. Generally, such waves are formed by the superposition of a forward wave and the reflected wave. Both longitudinal and transverse types of waves can form a stationary wave.
[14] What is inertia?
A.
Tendency to resist change in the current state
B.
Tendency to impart acceleration to a body
C.
Tendency to bring a body to rest
D.
Tendency to change its current state
Ans:
Tendency to resist change in the current state
Explanation :
[15] A good conductor while carrying current is -
A.
alternately charged positive and negative
B.
negatively charged
C.
positively charged
D.
electrically neutral
Ans:
negatively charged
Explanation :
Electrons carry current in a good conductor of electricity and they are negatively charged. This makes a good electrical conductor negatively charged.
[16] The propagation of sound waves in a gas involves –
A.
Adiabatic compression and rarefaction
B.
Isothermal compression and rarefaction
C.
Isochoric compression and rarefaction
D.
Isobaric compression and rarefaction
Ans:
Adiabatic compression and rarefaction
Explanation :
Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing. During propagation, waves can be reflected, refracted, or attenuated by the medium. Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves.
[17] We always see the same lace of the moon, because –
A.
It is smaller than the earth
B.
It revolves on its axis in a direction opposite to that of the earth
C.
It takes equal time for revolution around the earth and rotation on its own axis
D.
It rotates at the same speed as the earth around the sun
Ans:
It takes equal time for revolution around the earth and rotation on its own axis
Explanation :
It is tidal locking that causes the synchronous rotation which causes the Moon to present "just one side" to the Earth all the time. The Moon rotates (spins) but very slowly, making one turn on its axis in the same time it takes to revolve (orbit) around the Earth. So it maintains a "constant face" in our direction.
[18] Which of the following events occurred first?
A.
Albert Einstein propounded the General Theory of Relativity
B.
Max Planck unveiled the Quantum Theory
C.
Marconi first transmitted a wireless signal
D.
Madame Marie Curie became the first woman Nobel Prize winner
Ans:
Max Planck unveiled the Quantum Theory
Explanation :
General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907-1915; Quantum Theory of Max Planck: 1900; Transmission of wireless signal by Marconi: first Atlantic wireless transmission on December 11, 1901; and Madame Curie becoming the first woman Nobel Prize winner: shared her 1903 Nobel Prize in Physics with her husband Pierre Curie.
[19] The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because -
A.
the ringing is not loud enough
B.
the glass of the bell jar absorbs the sound waves
C.
the bell jar is too small
D.
there is no air or any other gas in the bell jar
Ans:
there is no air or any other gas in the bell jar
Explanation :
[20] At hill stations, the boiling point of water will be –
A.
same as at sea level
B.
less than that at sea level
C.
more than that at sea level
D.
equal to the melting point of ice
Ans:
less than that at sea level
Explanation :
The boiling point is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid. Atmospheric pressure is due to air above any given point. The atmospheric pressure at high altitudes like hill station is less than at the sea level.
[21] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[22] Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
A.
Microwave, infrared, visible. X-rays
B.
X-rays, visible, infrared, microwave
C.
Visible, infrared, microwave, X-rays
D.
X-rays, infrared, visible, microwave
Ans:
X-rays, infrared, visible, microwave
Explanation :
The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rays-wavelength: 0.01 nm ; X-rays -1 nm ; Ultra-violet Rays-0.1 micrometres ; Visible Light-Red light : 0.7 micrometres, Violet Light : 0.4 micrometres ; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm, usually lem ; Radiowaves- Long, Medium and Short Waves : 1am-10 m ; and Very High Frequency (VHF) and Ultra High Frequency (UHF): 10 m-10 cm.
[23] A black body can absorb radiations of ;
A.
lower wavelengths only
B.
intermediate wavelengths only
C.
higher wavelengths only
D.
all wavelengths
Ans:
all wavelengths
Explanation :
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
[24] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[25] When hot liquid is poured into a thick glass tumbler, it cracks because glass –
A.
is a bad conductor of heat so only inner surface expands
B.
has high temperature coefficient of expansion
C.
has a very low specific heat
D.
has low temperature coefficient of expansion
Ans:
is a bad conductor of heat so only inner surface expands
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Explanation :
0
[12] Ozone layer in the outer atmosphere helps us in –
A.
reflecting radio waves and makes radio communication possible
B.
regulating he temperature of atmosphere
C.
absorbing cosmic ray particles
D.
absorbing U-V radiations
Ans:
absorbing U-V radiations
Explanation :
The ozone layer is a layer in Earth's atmosphere containing relatively high concentrations of ozone (03) which absorbs 97-99% of the Sun's medium-frequency ultraviolet light.
[13] Stationary wave is formed by –
A.
a transverse wave superposing a longitudinal wave
B.
two waves of the same speed superposing
C.
two waves of same frequency travelling in the same direction
D.
two waves of same frequency travelling in the opposite direction
Ans:
two waves of same frequency travelling in the opposite direction
Explanation :
Stationary or standing waves are formed in a medium when two waves having equal amplitude and frequency moving in opposite directions along the same line, interfere in a confined space. Generally, such waves are formed by the superposition of a forward wave and the reflected wave. Both longitudinal and transverse types of waves can form a stationary wave.
[14] What is inertia?
A.
Tendency to resist change in the current state
B.
Tendency to impart acceleration to a body
C.
Tendency to bring a body to rest
D.
Tendency to change its current state
Ans:
Tendency to resist change in the current state
Explanation :
[15] A good conductor while carrying current is -
A.
alternately charged positive and negative
B.
negatively charged
C.
positively charged
D.
electrically neutral
Ans:
negatively charged
Explanation :
Electrons carry current in a good conductor of electricity and they are negatively charged. This makes a good electrical conductor negatively charged.
[16] The propagation of sound waves in a gas involves –
A.
Adiabatic compression and rarefaction
B.
Isothermal compression and rarefaction
C.
Isochoric compression and rarefaction
D.
Isobaric compression and rarefaction
Ans:
Adiabatic compression and rarefaction
Explanation :
Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing. During propagation, waves can be reflected, refracted, or attenuated by the medium. Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves.
[17] We always see the same lace of the moon, because –
A.
It is smaller than the earth
B.
It revolves on its axis in a direction opposite to that of the earth
C.
It takes equal time for revolution around the earth and rotation on its own axis
D.
It rotates at the same speed as the earth around the sun
Ans:
It takes equal time for revolution around the earth and rotation on its own axis
Explanation :
It is tidal locking that causes the synchronous rotation which causes the Moon to present "just one side" to the Earth all the time. The Moon rotates (spins) but very slowly, making one turn on its axis in the same time it takes to revolve (orbit) around the Earth. So it maintains a "constant face" in our direction.
[18] Which of the following events occurred first?
A.
Albert Einstein propounded the General Theory of Relativity
B.
Max Planck unveiled the Quantum Theory
C.
Marconi first transmitted a wireless signal
D.
Madame Marie Curie became the first woman Nobel Prize winner
Ans:
Max Planck unveiled the Quantum Theory
Explanation :
General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907-1915; Quantum Theory of Max Planck: 1900; Transmission of wireless signal by Marconi: first Atlantic wireless transmission on December 11, 1901; and Madame Curie becoming the first woman Nobel Prize winner: shared her 1903 Nobel Prize in Physics with her husband Pierre Curie.
[19] The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because -
A.
the ringing is not loud enough
B.
the glass of the bell jar absorbs the sound waves
C.
the bell jar is too small
D.
there is no air or any other gas in the bell jar
Ans:
there is no air or any other gas in the bell jar
Explanation :
[20] At hill stations, the boiling point of water will be –
A.
same as at sea level
B.
less than that at sea level
C.
more than that at sea level
D.
equal to the melting point of ice
Ans:
less than that at sea level
Explanation :
The boiling point is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid. Atmospheric pressure is due to air above any given point. The atmospheric pressure at high altitudes like hill station is less than at the sea level.
[21] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[22] Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
A.
Microwave, infrared, visible. X-rays
B.
X-rays, visible, infrared, microwave
C.
Visible, infrared, microwave, X-rays
D.
X-rays, infrared, visible, microwave
Ans:
X-rays, infrared, visible, microwave
Explanation :
The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rays-wavelength: 0.01 nm ; X-rays -1 nm ; Ultra-violet Rays-0.1 micrometres ; Visible Light-Red light : 0.7 micrometres, Violet Light : 0.4 micrometres ; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm, usually lem ; Radiowaves- Long, Medium and Short Waves : 1am-10 m ; and Very High Frequency (VHF) and Ultra High Frequency (UHF): 10 m-10 cm.
[23] A black body can absorb radiations of ;
A.
lower wavelengths only
B.
intermediate wavelengths only
C.
higher wavelengths only
D.
all wavelengths
Ans:
all wavelengths
Explanation :
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
[24] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[25] When hot liquid is poured into a thick glass tumbler, it cracks because glass –
A.
is a bad conductor of heat so only inner surface expands
B.
has high temperature coefficient of expansion
C.
has a very low specific heat
D.
has low temperature coefficient of expansion
Ans:
is a bad conductor of heat so only inner surface expands
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Explanation :
Stationary or standing waves are formed in a medium when two waves having equal amplitude and frequency moving in opposite directions along the same line, interfere in a confined space. Generally, such waves are formed by the superposition of a forward wave and the reflected wave. Both longitudinal and transverse types of waves can form a stationary wave.
[14] What is inertia?
A.
Tendency to resist change in the current state
B.
Tendency to impart acceleration to a body
C.
Tendency to bring a body to rest
D.
Tendency to change its current state
Ans:
Tendency to resist change in the current state
Explanation :
[15] A good conductor while carrying current is -
A.
alternately charged positive and negative
B.
negatively charged
C.
positively charged
D.
electrically neutral
Ans:
negatively charged
Explanation :
Electrons carry current in a good conductor of electricity and they are negatively charged. This makes a good electrical conductor negatively charged.
[16] The propagation of sound waves in a gas involves –
A.
Adiabatic compression and rarefaction
B.
Isothermal compression and rarefaction
C.
Isochoric compression and rarefaction
D.
Isobaric compression and rarefaction
Ans:
Adiabatic compression and rarefaction
Explanation :
Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing. During propagation, waves can be reflected, refracted, or attenuated by the medium. Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves.
[17] We always see the same lace of the moon, because –
A.
It is smaller than the earth
B.
It revolves on its axis in a direction opposite to that of the earth
C.
It takes equal time for revolution around the earth and rotation on its own axis
D.
It rotates at the same speed as the earth around the sun
Ans:
It takes equal time for revolution around the earth and rotation on its own axis
Explanation :
It is tidal locking that causes the synchronous rotation which causes the Moon to present "just one side" to the Earth all the time. The Moon rotates (spins) but very slowly, making one turn on its axis in the same time it takes to revolve (orbit) around the Earth. So it maintains a "constant face" in our direction.
[18] Which of the following events occurred first?
A.
Albert Einstein propounded the General Theory of Relativity
B.
Max Planck unveiled the Quantum Theory
C.
Marconi first transmitted a wireless signal
D.
Madame Marie Curie became the first woman Nobel Prize winner
Ans:
Max Planck unveiled the Quantum Theory
Explanation :
General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907-1915; Quantum Theory of Max Planck: 1900; Transmission of wireless signal by Marconi: first Atlantic wireless transmission on December 11, 1901; and Madame Curie becoming the first woman Nobel Prize winner: shared her 1903 Nobel Prize in Physics with her husband Pierre Curie.
[19] The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because -
A.
the ringing is not loud enough
B.
the glass of the bell jar absorbs the sound waves
C.
the bell jar is too small
D.
there is no air or any other gas in the bell jar
Ans:
there is no air or any other gas in the bell jar
Explanation :
[20] At hill stations, the boiling point of water will be –
A.
same as at sea level
B.
less than that at sea level
C.
more than that at sea level
D.
equal to the melting point of ice
Ans:
less than that at sea level
Explanation :
The boiling point is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid. Atmospheric pressure is due to air above any given point. The atmospheric pressure at high altitudes like hill station is less than at the sea level.
[21] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[22] Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
A.
Microwave, infrared, visible. X-rays
B.
X-rays, visible, infrared, microwave
C.
Visible, infrared, microwave, X-rays
D.
X-rays, infrared, visible, microwave
Ans:
X-rays, infrared, visible, microwave
Explanation :
The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rays-wavelength: 0.01 nm ; X-rays -1 nm ; Ultra-violet Rays-0.1 micrometres ; Visible Light-Red light : 0.7 micrometres, Violet Light : 0.4 micrometres ; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm, usually lem ; Radiowaves- Long, Medium and Short Waves : 1am-10 m ; and Very High Frequency (VHF) and Ultra High Frequency (UHF): 10 m-10 cm.
[23] A black body can absorb radiations of ;
A.
lower wavelengths only
B.
intermediate wavelengths only
C.
higher wavelengths only
D.
all wavelengths
Ans:
all wavelengths
Explanation :
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
[24] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[25] When hot liquid is poured into a thick glass tumbler, it cracks because glass –
A.
is a bad conductor of heat so only inner surface expands
B.
has high temperature coefficient of expansion
C.
has a very low specific heat
D.
has low temperature coefficient of expansion
Ans:
is a bad conductor of heat so only inner surface expands
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Explanation :
Electrons carry current in a good conductor of electricity and they are negatively charged. This makes a good electrical conductor negatively charged.
[16] The propagation of sound waves in a gas involves –
A.
Adiabatic compression and rarefaction
B.
Isothermal compression and rarefaction
C.
Isochoric compression and rarefaction
D.
Isobaric compression and rarefaction
Ans:
Adiabatic compression and rarefaction
Explanation :
Sound is a mechanical wave that is an oscillation of pressure transmitted through a solid, liquid, or gas, composed of frequencies within the range of hearing. During propagation, waves can be reflected, refracted, or attenuated by the medium. Sound is transmitted through gases, plasma, and liquids as longitudinal waves, also called compression waves. Through solids, however, it can be transmitted as both longitudinal waves and transverse waves.
[17] We always see the same lace of the moon, because –
A.
It is smaller than the earth
B.
It revolves on its axis in a direction opposite to that of the earth
C.
It takes equal time for revolution around the earth and rotation on its own axis
D.
It rotates at the same speed as the earth around the sun
Ans:
It takes equal time for revolution around the earth and rotation on its own axis
Explanation :
It is tidal locking that causes the synchronous rotation which causes the Moon to present "just one side" to the Earth all the time. The Moon rotates (spins) but very slowly, making one turn on its axis in the same time it takes to revolve (orbit) around the Earth. So it maintains a "constant face" in our direction.
[18] Which of the following events occurred first?
A.
Albert Einstein propounded the General Theory of Relativity
B.
Max Planck unveiled the Quantum Theory
C.
Marconi first transmitted a wireless signal
D.
Madame Marie Curie became the first woman Nobel Prize winner
Ans:
Max Planck unveiled the Quantum Theory
Explanation :
General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907-1915; Quantum Theory of Max Planck: 1900; Transmission of wireless signal by Marconi: first Atlantic wireless transmission on December 11, 1901; and Madame Curie becoming the first woman Nobel Prize winner: shared her 1903 Nobel Prize in Physics with her husband Pierre Curie.
[19] The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because -
A.
the ringing is not loud enough
B.
the glass of the bell jar absorbs the sound waves
C.
the bell jar is too small
D.
there is no air or any other gas in the bell jar
Ans:
there is no air or any other gas in the bell jar
Explanation :
[20] At hill stations, the boiling point of water will be –
A.
same as at sea level
B.
less than that at sea level
C.
more than that at sea level
D.
equal to the melting point of ice
Ans:
less than that at sea level
Explanation :
The boiling point is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid. Atmospheric pressure is due to air above any given point. The atmospheric pressure at high altitudes like hill station is less than at the sea level.
[21] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[22] Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
A.
Microwave, infrared, visible. X-rays
B.
X-rays, visible, infrared, microwave
C.
Visible, infrared, microwave, X-rays
D.
X-rays, infrared, visible, microwave
Ans:
X-rays, infrared, visible, microwave
Explanation :
The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rays-wavelength: 0.01 nm ; X-rays -1 nm ; Ultra-violet Rays-0.1 micrometres ; Visible Light-Red light : 0.7 micrometres, Violet Light : 0.4 micrometres ; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm, usually lem ; Radiowaves- Long, Medium and Short Waves : 1am-10 m ; and Very High Frequency (VHF) and Ultra High Frequency (UHF): 10 m-10 cm.
[23] A black body can absorb radiations of ;
A.
lower wavelengths only
B.
intermediate wavelengths only
C.
higher wavelengths only
D.
all wavelengths
Ans:
all wavelengths
Explanation :
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
[24] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[25] When hot liquid is poured into a thick glass tumbler, it cracks because glass –
A.
is a bad conductor of heat so only inner surface expands
B.
has high temperature coefficient of expansion
C.
has a very low specific heat
D.
has low temperature coefficient of expansion
Ans:
is a bad conductor of heat so only inner surface expands
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Explanation :
It is tidal locking that causes the synchronous rotation which causes the Moon to present "just one side" to the Earth all the time. The Moon rotates (spins) but very slowly, making one turn on its axis in the same time it takes to revolve (orbit) around the Earth. So it maintains a "constant face" in our direction.
[18] Which of the following events occurred first?
A.
Albert Einstein propounded the General Theory of Relativity
B.
Max Planck unveiled the Quantum Theory
C.
Marconi first transmitted a wireless signal
D.
Madame Marie Curie became the first woman Nobel Prize winner
Ans:
Max Planck unveiled the Quantum Theory
Explanation :
General Theory of Relativity: a theory of gravitation developed by Einstein in the years 1907-1915; Quantum Theory of Max Planck: 1900; Transmission of wireless signal by Marconi: first Atlantic wireless transmission on December 11, 1901; and Madame Curie becoming the first woman Nobel Prize winner: shared her 1903 Nobel Prize in Physics with her husband Pierre Curie.
[19] The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because -
A.
the ringing is not loud enough
B.
the glass of the bell jar absorbs the sound waves
C.
the bell jar is too small
D.
there is no air or any other gas in the bell jar
Ans:
there is no air or any other gas in the bell jar
Explanation :
[20] At hill stations, the boiling point of water will be –
A.
same as at sea level
B.
less than that at sea level
C.
more than that at sea level
D.
equal to the melting point of ice
Ans:
less than that at sea level
Explanation :
The boiling point is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid. Atmospheric pressure is due to air above any given point. The atmospheric pressure at high altitudes like hill station is less than at the sea level.
[21] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[22] Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
A.
Microwave, infrared, visible. X-rays
B.
X-rays, visible, infrared, microwave
C.
Visible, infrared, microwave, X-rays
D.
X-rays, infrared, visible, microwave
Ans:
X-rays, infrared, visible, microwave
Explanation :
The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rays-wavelength: 0.01 nm ; X-rays -1 nm ; Ultra-violet Rays-0.1 micrometres ; Visible Light-Red light : 0.7 micrometres, Violet Light : 0.4 micrometres ; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm, usually lem ; Radiowaves- Long, Medium and Short Waves : 1am-10 m ; and Very High Frequency (VHF) and Ultra High Frequency (UHF): 10 m-10 cm.
[23] A black body can absorb radiations of ;
A.
lower wavelengths only
B.
intermediate wavelengths only
C.
higher wavelengths only
D.
all wavelengths
Ans:
all wavelengths
Explanation :
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
[24] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[25] When hot liquid is poured into a thick glass tumbler, it cracks because glass –
A.
is a bad conductor of heat so only inner surface expands
B.
has high temperature coefficient of expansion
C.
has a very low specific heat
D.
has low temperature coefficient of expansion
Ans:
is a bad conductor of heat so only inner surface expands
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Explanation :
[20] At hill stations, the boiling point of water will be –
A.
same as at sea level
B.
less than that at sea level
C.
more than that at sea level
D.
equal to the melting point of ice
Ans:
less than that at sea level
Explanation :
The boiling point is the temperature at which the vapour pressure of the liquid equals the environmental pressure surrounding the liquid. Atmospheric pressure is due to air above any given point. The atmospheric pressure at high altitudes like hill station is less than at the sea level.
[21] The information of brilliant colors in a thin soap film is a consequence of the phenomena of -
A.
Polarization and interference
B.
Diffraction and dispersion
C.
Multiple refraction and dispersion
D.
Multiple reflection and interference
Ans:
Multiple reflection and interference
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[22] Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
A.
Microwave, infrared, visible. X-rays
B.
X-rays, visible, infrared, microwave
C.
Visible, infrared, microwave, X-rays
D.
X-rays, infrared, visible, microwave
Ans:
X-rays, infrared, visible, microwave
Explanation :
The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rays-wavelength: 0.01 nm ; X-rays -1 nm ; Ultra-violet Rays-0.1 micrometres ; Visible Light-Red light : 0.7 micrometres, Violet Light : 0.4 micrometres ; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm, usually lem ; Radiowaves- Long, Medium and Short Waves : 1am-10 m ; and Very High Frequency (VHF) and Ultra High Frequency (UHF): 10 m-10 cm.
[23] A black body can absorb radiations of ;
A.
lower wavelengths only
B.
intermediate wavelengths only
C.
higher wavelengths only
D.
all wavelengths
Ans:
all wavelengths
Explanation :
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
[24] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[25] When hot liquid is poured into a thick glass tumbler, it cracks because glass –
A.
is a bad conductor of heat so only inner surface expands
B.
has high temperature coefficient of expansion
C.
has a very low specific heat
D.
has low temperature coefficient of expansion
Ans:
is a bad conductor of heat so only inner surface expands
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Explanation :
Light waves reflected by the upper and lower boundaries of a thin film interfere with one another, either enhancing or reducing the reflected light.
[22] Indicate the correct arrangement for electromagnetic radiation in order of their increasing wavelength.
A.
Microwave, infrared, visible. X-rays
B.
X-rays, visible, infrared, microwave
C.
Visible, infrared, microwave, X-rays
D.
X-rays, infrared, visible, microwave
Ans:
X-rays, infrared, visible, microwave
Explanation :
The Electromagnetic spectrum in order of decreasing energy, thus increasing wavelength : Gamma Rays-wavelength: 0.01 nm ; X-rays -1 nm ; Ultra-violet Rays-0.1 micrometres ; Visible Light-Red light : 0.7 micrometres, Violet Light : 0.4 micrometres ; Infrared Radiation-0.01 mm ; Microwaves -less than 10 cm, usually lem ; Radiowaves- Long, Medium and Short Waves : 1am-10 m ; and Very High Frequency (VHF) and Ultra High Frequency (UHF): 10 m-10 cm.
[23] A black body can absorb radiations of ;
A.
lower wavelengths only
B.
intermediate wavelengths only
C.
higher wavelengths only
D.
all wavelengths
Ans:
all wavelengths
Explanation :
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
[24] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[25] When hot liquid is poured into a thick glass tumbler, it cracks because glass –
A.
is a bad conductor of heat so only inner surface expands
B.
has high temperature coefficient of expansion
C.
has a very low specific heat
D.
has low temperature coefficient of expansion
Ans:
is a bad conductor of heat so only inner surface expands
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Explanation :
A black body is a theoretical object that absorbs 100% of the radiation that hits it. Therefore it reflects no radiation and appears perfectly black. At a particular temperature the black body would emit the maximum amount of energy possible for that temperature. This value is known as the black body radiation. It would emit at every wavelength of light as it must be able to absorb every wavelength to be sure of absorbing all incoming radiation.
[24] The water from a hand pump is warm in winter because –
A.
Our body is cold in winter and the water appears to be warm
B.
The temperature inside the earth is higher than the atmospheric temperature
C.
The pumping process causes friction which warms up the water
D.
Inside water comes out and absorbs heat from the environment
Ans:
The temperature inside the earth is higher than the atmospheric temperature
Explanation :
In winter, the outside temperature is lower than that of water flowing out of the pump, and therefore, the water is warm. Whereas in summer, the outside temperature is higher than the water of the pump, and therefore, it feels cold.
[25] When hot liquid is poured into a thick glass tumbler, it cracks because glass –
A.
is a bad conductor of heat so only inner surface expands
B.
has high temperature coefficient of expansion
C.
has a very low specific heat
D.
has low temperature coefficient of expansion
Ans:
is a bad conductor of heat so only inner surface expands
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.
Explanation :
When hot liquid is poured into a thick glass tumbler, it cracks because glass is a bad conductor of heat so only inner surface expands.