[1] X-rays are –
A.
positively charged particles
B.
negatively charged particles
C.
neutral particles
D.
None of these
Ans:
neutral particles
Explanation :
Like gamma rays and neutrons, X-rays are electrically neutral. They have neither a positive nor a negative charge. They cannot be accelerated or made to change direction by a magnet or electrical field. In contrast, charged subatomic particles comprise light charged particles (electrons and positrons) and heavy charged particles (protons, alpha particles and heavier ions).
[2] Which of the following is the second largest source of global energy?
A.
Fossil fuel
B.
Nuclear Energy
C.
Renewable Energy
D.
None of these
Ans:
Renewable Energy
Explanation :
Data for 2013 shows that renewable electricity generation overtook natural gas to become the second largest source of electricity worldwide producing 22% of total electricity or 5,130 Twh.
[3] Which of the following methods will separate water from muddy water?
A.
Separating funnel
B.
Distillation
C.
Crystallization
D.
Filtration
Ans:
Filtration
Explanation :
There are two ways to get water from a muddy mess: evaporation and filtration. Filtration is a process where the water is pumped through a porous material.
[4] An a-particle is .
A.
A hydrogen molecule
B.
A helium nucleus
C.
An atom of hydrogen
D.
A proton
Ans:
A helium nucleus
Explanation :
Alpha particle, positively charged particle, identical to the nucleus of the helium-4 atom, spontaneously emitted by some radioactive substances, consisting of two protons and two neutrons bound together.
[5] What type of lens is used to correct vision of a person suffering from Myopia?
A.
Convex lens
B.
Concave lens
C.
Crossed lens
D.
Cylindrical lens
Ans:
Concave lens
Explanation :
Near-sightedness, also known as short-sightedness and myopia, is a condition of the eye where light focuses in front of, instead of on, the retina. This causes distant objects to be blurry while close objects appear normal.
[6] What is the name of the device used to convert alternating cur-rent into direct current?
A.
Amreter
B.
Galvanometer
C.
Rectifier
D.
Transformer
Ans:
Rectifier
Explanation :
A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification.
[7] A light year is a unit of:
A.
Time
B.
Distance
C.
Intencity of Light
D.
Frequency
Ans:
Distance
Explanation :
A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km.
[8] The SI unit of luminous emittance is -
A.
Lux
B.
Candela
C.
Lumen
D.
Lumen second
Ans:
Lux
Explanation :
The lux is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface.
[9] Total internal reflection cannot take place when light goes from –
A.
glass to water
B.
water to glass
C.
water to air
D.
glass to air
Ans:
water to glass
Explanation :
For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air). It will not happen for light traveling from water (n=1.333) towards glass (n=1.52).
[10] Hertz is a unit for measuring –
A.
Intensity of waves
B.
Frequency of waves
C.
Wavelength
D.
Clarity of waves
Ans:
Frequency of waves
Explanation :
Hertz (symbol Hz) is the unit of frequency of waves in the International System of Units (SI). It is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.
[11] The unit of Planck's constant is –
A.
Js
B.
Js⁻²
C.
J/s
D.
Js²
Ans:
Js
Explanation :
The Planck constant has dimensions of physical action; these are the same as those of angular momentum, i.e., energy multiplied by time, or momentum multiplied by distance.
[12] If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be -
A.
R/4
B.
R/2
C.
R
D.
2R
Ans:
R/4
Explanation :
0
[13] Clouds float in the atmosphere because of their –
A.
low pressure
B.
low density
C.
low viscosity
D.
low temperature
Ans:
low density
Explanation :
The key to why clouds float is that the density of the same volume of cloud material is less than the density of the same amount of dry air. Just as oil floats on water because it is less dense, clouds float on air because the moist air in clouds is less dense than dry air.
[14] Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
A.
Scattering
B.
Diffraction
C.
Interference
D.
Polarization
Ans:
Scattering
Explanation :
Sir C.V. Raman was awarded Nobel Prize for his work scattering of radiation. Sir Chandrashekhara Venkata Raman was an Indian physicist born in the former Madras Province in India.
[15] Removal of carbon particles from air involves the principle of -
A.
Precipitation
B.
Filteration
C.
Electrophoresis
D.
Sedimentation
Ans:
Electrophoresis
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon particles from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[16] The focal length of a plane mirror is .
A.
Positive
B.
Negative
C.
Zero
D.
Infinity
Ans:
Infinity
Explanation :
A plane mirror is a mirror with a flat reflective surface. The focal length of a plane mirror is infinity. Its optical power is zero.
[17] The wire having a green plastic covering is a .
A.
Line wire
B.
Neutral wire
C.
Earth wire
D.
None of these
Ans:
Earth wire
Explanation :
The earth wire is a crucial part of the home electrical system and is designed to protect against electric shock.
[18] Who among the following invented battery?
A.
Rudolf Diesel
B.
Alfred Noble
C.
Alessandro Volta
D.
John Napier
Ans:
Alessandro Volta
Explanation :
Alessandro Giuseppe Antonio Anastasio Volta was an Italian physicist, chemist, and a pioneer of electricity and power, who is credited as the inventor of the electric battery and the discoverer of methane.
[19] The centre of the reflecting surface of a spherical mirror is called the :
A.
Radius
B.
Centre of Curvature
C.
Pole
D.
Focus
Ans:
Pole
Explanation :
The center of the reflecting surface of a spherical mirror is called as the pole of the mirror which is mainly known as the center of curvature.
[20] If a bomb dropped from an airplane explodes in mid-air .
A.
its KE increases
B.
its total energy increases
C.
its total energy decreases
D.
its total momentum decreases
Ans:
its KE increases
Explanation :
The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
[21] The phenomenon of radioactivity was discovered by -
A.
Marie Curie
B.
Pierre Curie
C.
Henri Becquerel
D.
J.J Thomson
Ans:
Henri Becquerel
Explanation :
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[22] Energy travels from Sun to Earth through –
A.
conduction
B.
convection
C.
radiation
D.
modulation
Ans:
radiation
Explanation :
Solar energy, in the form of heat and light, travels from the sun to Earth through the process of radiation. This way, energy can be transferred through empty space without relying on matter. This radiation is largely visible as light to the naked eye, although it also includes ultraviolet and infrared radiation as well.
[23] Rain drops acquire spherical shape due to -
A.
viscosity
B.
surface tension
C.
friction
D.
elasticity
Ans:
surface tension
Explanation :
The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.
[24] Pieces of camphor placed on water move about rapidly. This is because of -
A.
diffusion
B.
viscosity
C.
surface tension
D.
capillarity
Ans:
surface tension
Explanation :
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
[25] Which among the following is a vector quantity?
A.
Heat
B.
Angular momentum
C.
Work
D.
Time
Ans:
Angular momentum
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.
Explanation :
Like gamma rays and neutrons, X-rays are electrically neutral. They have neither a positive nor a negative charge. They cannot be accelerated or made to change direction by a magnet or electrical field. In contrast, charged subatomic particles comprise light charged particles (electrons and positrons) and heavy charged particles (protons, alpha particles and heavier ions).
[2] Which of the following is the second largest source of global energy?
A.
Fossil fuel
B.
Nuclear Energy
C.
Renewable Energy
D.
None of these
Ans:
Renewable Energy
Explanation :
Data for 2013 shows that renewable electricity generation overtook natural gas to become the second largest source of electricity worldwide producing 22% of total electricity or 5,130 Twh.
[3] Which of the following methods will separate water from muddy water?
A.
Separating funnel
B.
Distillation
C.
Crystallization
D.
Filtration
Ans:
Filtration
Explanation :
There are two ways to get water from a muddy mess: evaporation and filtration. Filtration is a process where the water is pumped through a porous material.
[4] An a-particle is .
A.
A hydrogen molecule
B.
A helium nucleus
C.
An atom of hydrogen
D.
A proton
Ans:
A helium nucleus
Explanation :
Alpha particle, positively charged particle, identical to the nucleus of the helium-4 atom, spontaneously emitted by some radioactive substances, consisting of two protons and two neutrons bound together.
[5] What type of lens is used to correct vision of a person suffering from Myopia?
A.
Convex lens
B.
Concave lens
C.
Crossed lens
D.
Cylindrical lens
Ans:
Concave lens
Explanation :
Near-sightedness, also known as short-sightedness and myopia, is a condition of the eye where light focuses in front of, instead of on, the retina. This causes distant objects to be blurry while close objects appear normal.
[6] What is the name of the device used to convert alternating cur-rent into direct current?
A.
Amreter
B.
Galvanometer
C.
Rectifier
D.
Transformer
Ans:
Rectifier
Explanation :
A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification.
[7] A light year is a unit of:
A.
Time
B.
Distance
C.
Intencity of Light
D.
Frequency
Ans:
Distance
Explanation :
A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km.
[8] The SI unit of luminous emittance is -
A.
Lux
B.
Candela
C.
Lumen
D.
Lumen second
Ans:
Lux
Explanation :
The lux is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface.
[9] Total internal reflection cannot take place when light goes from –
A.
glass to water
B.
water to glass
C.
water to air
D.
glass to air
Ans:
water to glass
Explanation :
For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air). It will not happen for light traveling from water (n=1.333) towards glass (n=1.52).
[10] Hertz is a unit for measuring –
A.
Intensity of waves
B.
Frequency of waves
C.
Wavelength
D.
Clarity of waves
Ans:
Frequency of waves
Explanation :
Hertz (symbol Hz) is the unit of frequency of waves in the International System of Units (SI). It is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.
[11] The unit of Planck's constant is –
A.
Js
B.
Js⁻²
C.
J/s
D.
Js²
Ans:
Js
Explanation :
The Planck constant has dimensions of physical action; these are the same as those of angular momentum, i.e., energy multiplied by time, or momentum multiplied by distance.
[12] If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be -
A.
R/4
B.
R/2
C.
R
D.
2R
Ans:
R/4
Explanation :
0
[13] Clouds float in the atmosphere because of their –
A.
low pressure
B.
low density
C.
low viscosity
D.
low temperature
Ans:
low density
Explanation :
The key to why clouds float is that the density of the same volume of cloud material is less than the density of the same amount of dry air. Just as oil floats on water because it is less dense, clouds float on air because the moist air in clouds is less dense than dry air.
[14] Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
A.
Scattering
B.
Diffraction
C.
Interference
D.
Polarization
Ans:
Scattering
Explanation :
Sir C.V. Raman was awarded Nobel Prize for his work scattering of radiation. Sir Chandrashekhara Venkata Raman was an Indian physicist born in the former Madras Province in India.
[15] Removal of carbon particles from air involves the principle of -
A.
Precipitation
B.
Filteration
C.
Electrophoresis
D.
Sedimentation
Ans:
Electrophoresis
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon particles from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[16] The focal length of a plane mirror is .
A.
Positive
B.
Negative
C.
Zero
D.
Infinity
Ans:
Infinity
Explanation :
A plane mirror is a mirror with a flat reflective surface. The focal length of a plane mirror is infinity. Its optical power is zero.
[17] The wire having a green plastic covering is a .
A.
Line wire
B.
Neutral wire
C.
Earth wire
D.
None of these
Ans:
Earth wire
Explanation :
The earth wire is a crucial part of the home electrical system and is designed to protect against electric shock.
[18] Who among the following invented battery?
A.
Rudolf Diesel
B.
Alfred Noble
C.
Alessandro Volta
D.
John Napier
Ans:
Alessandro Volta
Explanation :
Alessandro Giuseppe Antonio Anastasio Volta was an Italian physicist, chemist, and a pioneer of electricity and power, who is credited as the inventor of the electric battery and the discoverer of methane.
[19] The centre of the reflecting surface of a spherical mirror is called the :
A.
Radius
B.
Centre of Curvature
C.
Pole
D.
Focus
Ans:
Pole
Explanation :
The center of the reflecting surface of a spherical mirror is called as the pole of the mirror which is mainly known as the center of curvature.
[20] If a bomb dropped from an airplane explodes in mid-air .
A.
its KE increases
B.
its total energy increases
C.
its total energy decreases
D.
its total momentum decreases
Ans:
its KE increases
Explanation :
The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
[21] The phenomenon of radioactivity was discovered by -
A.
Marie Curie
B.
Pierre Curie
C.
Henri Becquerel
D.
J.J Thomson
Ans:
Henri Becquerel
Explanation :
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[22] Energy travels from Sun to Earth through –
A.
conduction
B.
convection
C.
radiation
D.
modulation
Ans:
radiation
Explanation :
Solar energy, in the form of heat and light, travels from the sun to Earth through the process of radiation. This way, energy can be transferred through empty space without relying on matter. This radiation is largely visible as light to the naked eye, although it also includes ultraviolet and infrared radiation as well.
[23] Rain drops acquire spherical shape due to -
A.
viscosity
B.
surface tension
C.
friction
D.
elasticity
Ans:
surface tension
Explanation :
The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.
[24] Pieces of camphor placed on water move about rapidly. This is because of -
A.
diffusion
B.
viscosity
C.
surface tension
D.
capillarity
Ans:
surface tension
Explanation :
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
[25] Which among the following is a vector quantity?
A.
Heat
B.
Angular momentum
C.
Work
D.
Time
Ans:
Angular momentum
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.
Explanation :
There are two ways to get water from a muddy mess: evaporation and filtration. Filtration is a process where the water is pumped through a porous material.
[4] An a-particle is .
A.
A hydrogen molecule
B.
A helium nucleus
C.
An atom of hydrogen
D.
A proton
Ans:
A helium nucleus
Explanation :
Alpha particle, positively charged particle, identical to the nucleus of the helium-4 atom, spontaneously emitted by some radioactive substances, consisting of two protons and two neutrons bound together.
[5] What type of lens is used to correct vision of a person suffering from Myopia?
A.
Convex lens
B.
Concave lens
C.
Crossed lens
D.
Cylindrical lens
Ans:
Concave lens
Explanation :
Near-sightedness, also known as short-sightedness and myopia, is a condition of the eye where light focuses in front of, instead of on, the retina. This causes distant objects to be blurry while close objects appear normal.
[6] What is the name of the device used to convert alternating cur-rent into direct current?
A.
Amreter
B.
Galvanometer
C.
Rectifier
D.
Transformer
Ans:
Rectifier
Explanation :
A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification.
[7] A light year is a unit of:
A.
Time
B.
Distance
C.
Intencity of Light
D.
Frequency
Ans:
Distance
Explanation :
A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km.
[8] The SI unit of luminous emittance is -
A.
Lux
B.
Candela
C.
Lumen
D.
Lumen second
Ans:
Lux
Explanation :
The lux is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface.
[9] Total internal reflection cannot take place when light goes from –
A.
glass to water
B.
water to glass
C.
water to air
D.
glass to air
Ans:
water to glass
Explanation :
For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air). It will not happen for light traveling from water (n=1.333) towards glass (n=1.52).
[10] Hertz is a unit for measuring –
A.
Intensity of waves
B.
Frequency of waves
C.
Wavelength
D.
Clarity of waves
Ans:
Frequency of waves
Explanation :
Hertz (symbol Hz) is the unit of frequency of waves in the International System of Units (SI). It is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.
[11] The unit of Planck's constant is –
A.
Js
B.
Js⁻²
C.
J/s
D.
Js²
Ans:
Js
Explanation :
The Planck constant has dimensions of physical action; these are the same as those of angular momentum, i.e., energy multiplied by time, or momentum multiplied by distance.
[12] If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be -
A.
R/4
B.
R/2
C.
R
D.
2R
Ans:
R/4
Explanation :
0
[13] Clouds float in the atmosphere because of their –
A.
low pressure
B.
low density
C.
low viscosity
D.
low temperature
Ans:
low density
Explanation :
The key to why clouds float is that the density of the same volume of cloud material is less than the density of the same amount of dry air. Just as oil floats on water because it is less dense, clouds float on air because the moist air in clouds is less dense than dry air.
[14] Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
A.
Scattering
B.
Diffraction
C.
Interference
D.
Polarization
Ans:
Scattering
Explanation :
Sir C.V. Raman was awarded Nobel Prize for his work scattering of radiation. Sir Chandrashekhara Venkata Raman was an Indian physicist born in the former Madras Province in India.
[15] Removal of carbon particles from air involves the principle of -
A.
Precipitation
B.
Filteration
C.
Electrophoresis
D.
Sedimentation
Ans:
Electrophoresis
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon particles from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[16] The focal length of a plane mirror is .
A.
Positive
B.
Negative
C.
Zero
D.
Infinity
Ans:
Infinity
Explanation :
A plane mirror is a mirror with a flat reflective surface. The focal length of a plane mirror is infinity. Its optical power is zero.
[17] The wire having a green plastic covering is a .
A.
Line wire
B.
Neutral wire
C.
Earth wire
D.
None of these
Ans:
Earth wire
Explanation :
The earth wire is a crucial part of the home electrical system and is designed to protect against electric shock.
[18] Who among the following invented battery?
A.
Rudolf Diesel
B.
Alfred Noble
C.
Alessandro Volta
D.
John Napier
Ans:
Alessandro Volta
Explanation :
Alessandro Giuseppe Antonio Anastasio Volta was an Italian physicist, chemist, and a pioneer of electricity and power, who is credited as the inventor of the electric battery and the discoverer of methane.
[19] The centre of the reflecting surface of a spherical mirror is called the :
A.
Radius
B.
Centre of Curvature
C.
Pole
D.
Focus
Ans:
Pole
Explanation :
The center of the reflecting surface of a spherical mirror is called as the pole of the mirror which is mainly known as the center of curvature.
[20] If a bomb dropped from an airplane explodes in mid-air .
A.
its KE increases
B.
its total energy increases
C.
its total energy decreases
D.
its total momentum decreases
Ans:
its KE increases
Explanation :
The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
[21] The phenomenon of radioactivity was discovered by -
A.
Marie Curie
B.
Pierre Curie
C.
Henri Becquerel
D.
J.J Thomson
Ans:
Henri Becquerel
Explanation :
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[22] Energy travels from Sun to Earth through –
A.
conduction
B.
convection
C.
radiation
D.
modulation
Ans:
radiation
Explanation :
Solar energy, in the form of heat and light, travels from the sun to Earth through the process of radiation. This way, energy can be transferred through empty space without relying on matter. This radiation is largely visible as light to the naked eye, although it also includes ultraviolet and infrared radiation as well.
[23] Rain drops acquire spherical shape due to -
A.
viscosity
B.
surface tension
C.
friction
D.
elasticity
Ans:
surface tension
Explanation :
The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.
[24] Pieces of camphor placed on water move about rapidly. This is because of -
A.
diffusion
B.
viscosity
C.
surface tension
D.
capillarity
Ans:
surface tension
Explanation :
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
[25] Which among the following is a vector quantity?
A.
Heat
B.
Angular momentum
C.
Work
D.
Time
Ans:
Angular momentum
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.
Explanation :
Near-sightedness, also known as short-sightedness and myopia, is a condition of the eye where light focuses in front of, instead of on, the retina. This causes distant objects to be blurry while close objects appear normal.
[6] What is the name of the device used to convert alternating cur-rent into direct current?
A.
Amreter
B.
Galvanometer
C.
Rectifier
D.
Transformer
Ans:
Rectifier
Explanation :
A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification.
[7] A light year is a unit of:
A.
Time
B.
Distance
C.
Intencity of Light
D.
Frequency
Ans:
Distance
Explanation :
A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km.
[8] The SI unit of luminous emittance is -
A.
Lux
B.
Candela
C.
Lumen
D.
Lumen second
Ans:
Lux
Explanation :
The lux is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface.
[9] Total internal reflection cannot take place when light goes from –
A.
glass to water
B.
water to glass
C.
water to air
D.
glass to air
Ans:
water to glass
Explanation :
For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air). It will not happen for light traveling from water (n=1.333) towards glass (n=1.52).
[10] Hertz is a unit for measuring –
A.
Intensity of waves
B.
Frequency of waves
C.
Wavelength
D.
Clarity of waves
Ans:
Frequency of waves
Explanation :
Hertz (symbol Hz) is the unit of frequency of waves in the International System of Units (SI). It is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.
[11] The unit of Planck's constant is –
A.
Js
B.
Js⁻²
C.
J/s
D.
Js²
Ans:
Js
Explanation :
The Planck constant has dimensions of physical action; these are the same as those of angular momentum, i.e., energy multiplied by time, or momentum multiplied by distance.
[12] If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be -
A.
R/4
B.
R/2
C.
R
D.
2R
Ans:
R/4
Explanation :
0
[13] Clouds float in the atmosphere because of their –
A.
low pressure
B.
low density
C.
low viscosity
D.
low temperature
Ans:
low density
Explanation :
The key to why clouds float is that the density of the same volume of cloud material is less than the density of the same amount of dry air. Just as oil floats on water because it is less dense, clouds float on air because the moist air in clouds is less dense than dry air.
[14] Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
A.
Scattering
B.
Diffraction
C.
Interference
D.
Polarization
Ans:
Scattering
Explanation :
Sir C.V. Raman was awarded Nobel Prize for his work scattering of radiation. Sir Chandrashekhara Venkata Raman was an Indian physicist born in the former Madras Province in India.
[15] Removal of carbon particles from air involves the principle of -
A.
Precipitation
B.
Filteration
C.
Electrophoresis
D.
Sedimentation
Ans:
Electrophoresis
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon particles from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[16] The focal length of a plane mirror is .
A.
Positive
B.
Negative
C.
Zero
D.
Infinity
Ans:
Infinity
Explanation :
A plane mirror is a mirror with a flat reflective surface. The focal length of a plane mirror is infinity. Its optical power is zero.
[17] The wire having a green plastic covering is a .
A.
Line wire
B.
Neutral wire
C.
Earth wire
D.
None of these
Ans:
Earth wire
Explanation :
The earth wire is a crucial part of the home electrical system and is designed to protect against electric shock.
[18] Who among the following invented battery?
A.
Rudolf Diesel
B.
Alfred Noble
C.
Alessandro Volta
D.
John Napier
Ans:
Alessandro Volta
Explanation :
Alessandro Giuseppe Antonio Anastasio Volta was an Italian physicist, chemist, and a pioneer of electricity and power, who is credited as the inventor of the electric battery and the discoverer of methane.
[19] The centre of the reflecting surface of a spherical mirror is called the :
A.
Radius
B.
Centre of Curvature
C.
Pole
D.
Focus
Ans:
Pole
Explanation :
The center of the reflecting surface of a spherical mirror is called as the pole of the mirror which is mainly known as the center of curvature.
[20] If a bomb dropped from an airplane explodes in mid-air .
A.
its KE increases
B.
its total energy increases
C.
its total energy decreases
D.
its total momentum decreases
Ans:
its KE increases
Explanation :
The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
[21] The phenomenon of radioactivity was discovered by -
A.
Marie Curie
B.
Pierre Curie
C.
Henri Becquerel
D.
J.J Thomson
Ans:
Henri Becquerel
Explanation :
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[22] Energy travels from Sun to Earth through –
A.
conduction
B.
convection
C.
radiation
D.
modulation
Ans:
radiation
Explanation :
Solar energy, in the form of heat and light, travels from the sun to Earth through the process of radiation. This way, energy can be transferred through empty space without relying on matter. This radiation is largely visible as light to the naked eye, although it also includes ultraviolet and infrared radiation as well.
[23] Rain drops acquire spherical shape due to -
A.
viscosity
B.
surface tension
C.
friction
D.
elasticity
Ans:
surface tension
Explanation :
The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.
[24] Pieces of camphor placed on water move about rapidly. This is because of -
A.
diffusion
B.
viscosity
C.
surface tension
D.
capillarity
Ans:
surface tension
Explanation :
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
[25] Which among the following is a vector quantity?
A.
Heat
B.
Angular momentum
C.
Work
D.
Time
Ans:
Angular momentum
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.
Explanation :
A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km.
[8] The SI unit of luminous emittance is -
A.
Lux
B.
Candela
C.
Lumen
D.
Lumen second
Ans:
Lux
Explanation :
The lux is the SI unit of illuminance and luminous emittance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface.
[9] Total internal reflection cannot take place when light goes from –
A.
glass to water
B.
water to glass
C.
water to air
D.
glass to air
Ans:
water to glass
Explanation :
For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air). It will not happen for light traveling from water (n=1.333) towards glass (n=1.52).
[10] Hertz is a unit for measuring –
A.
Intensity of waves
B.
Frequency of waves
C.
Wavelength
D.
Clarity of waves
Ans:
Frequency of waves
Explanation :
Hertz (symbol Hz) is the unit of frequency of waves in the International System of Units (SI). It is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.
[11] The unit of Planck's constant is –
A.
Js
B.
Js⁻²
C.
J/s
D.
Js²
Ans:
Js
Explanation :
The Planck constant has dimensions of physical action; these are the same as those of angular momentum, i.e., energy multiplied by time, or momentum multiplied by distance.
[12] If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be -
A.
R/4
B.
R/2
C.
R
D.
2R
Ans:
R/4
Explanation :
0
[13] Clouds float in the atmosphere because of their –
A.
low pressure
B.
low density
C.
low viscosity
D.
low temperature
Ans:
low density
Explanation :
The key to why clouds float is that the density of the same volume of cloud material is less than the density of the same amount of dry air. Just as oil floats on water because it is less dense, clouds float on air because the moist air in clouds is less dense than dry air.
[14] Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
A.
Scattering
B.
Diffraction
C.
Interference
D.
Polarization
Ans:
Scattering
Explanation :
Sir C.V. Raman was awarded Nobel Prize for his work scattering of radiation. Sir Chandrashekhara Venkata Raman was an Indian physicist born in the former Madras Province in India.
[15] Removal of carbon particles from air involves the principle of -
A.
Precipitation
B.
Filteration
C.
Electrophoresis
D.
Sedimentation
Ans:
Electrophoresis
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon particles from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[16] The focal length of a plane mirror is .
A.
Positive
B.
Negative
C.
Zero
D.
Infinity
Ans:
Infinity
Explanation :
A plane mirror is a mirror with a flat reflective surface. The focal length of a plane mirror is infinity. Its optical power is zero.
[17] The wire having a green plastic covering is a .
A.
Line wire
B.
Neutral wire
C.
Earth wire
D.
None of these
Ans:
Earth wire
Explanation :
The earth wire is a crucial part of the home electrical system and is designed to protect against electric shock.
[18] Who among the following invented battery?
A.
Rudolf Diesel
B.
Alfred Noble
C.
Alessandro Volta
D.
John Napier
Ans:
Alessandro Volta
Explanation :
Alessandro Giuseppe Antonio Anastasio Volta was an Italian physicist, chemist, and a pioneer of electricity and power, who is credited as the inventor of the electric battery and the discoverer of methane.
[19] The centre of the reflecting surface of a spherical mirror is called the :
A.
Radius
B.
Centre of Curvature
C.
Pole
D.
Focus
Ans:
Pole
Explanation :
The center of the reflecting surface of a spherical mirror is called as the pole of the mirror which is mainly known as the center of curvature.
[20] If a bomb dropped from an airplane explodes in mid-air .
A.
its KE increases
B.
its total energy increases
C.
its total energy decreases
D.
its total momentum decreases
Ans:
its KE increases
Explanation :
The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
[21] The phenomenon of radioactivity was discovered by -
A.
Marie Curie
B.
Pierre Curie
C.
Henri Becquerel
D.
J.J Thomson
Ans:
Henri Becquerel
Explanation :
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[22] Energy travels from Sun to Earth through –
A.
conduction
B.
convection
C.
radiation
D.
modulation
Ans:
radiation
Explanation :
Solar energy, in the form of heat and light, travels from the sun to Earth through the process of radiation. This way, energy can be transferred through empty space without relying on matter. This radiation is largely visible as light to the naked eye, although it also includes ultraviolet and infrared radiation as well.
[23] Rain drops acquire spherical shape due to -
A.
viscosity
B.
surface tension
C.
friction
D.
elasticity
Ans:
surface tension
Explanation :
The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.
[24] Pieces of camphor placed on water move about rapidly. This is because of -
A.
diffusion
B.
viscosity
C.
surface tension
D.
capillarity
Ans:
surface tension
Explanation :
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
[25] Which among the following is a vector quantity?
A.
Heat
B.
Angular momentum
C.
Work
D.
Time
Ans:
Angular momentum
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.
Explanation :
For total internal reflection to occur the light must travel from a dense medium to a less dense medium (e.g. glass to air or water to air). It will not happen for light traveling from water (n=1.333) towards glass (n=1.52).
[10] Hertz is a unit for measuring –
A.
Intensity of waves
B.
Frequency of waves
C.
Wavelength
D.
Clarity of waves
Ans:
Frequency of waves
Explanation :
Hertz (symbol Hz) is the unit of frequency of waves in the International System of Units (SI). It is defined as one cycle per second. It is named for Heinrich Rudolf Hertz, the first person to provide conclusive proof of the existence of electromagnetic waves.
[11] The unit of Planck's constant is –
A.
Js
B.
Js⁻²
C.
J/s
D.
Js²
Ans:
Js
Explanation :
The Planck constant has dimensions of physical action; these are the same as those of angular momentum, i.e., energy multiplied by time, or momentum multiplied by distance.
[12] If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be -
A.
R/4
B.
R/2
C.
R
D.
2R
Ans:
R/4
Explanation :
0
[13] Clouds float in the atmosphere because of their –
A.
low pressure
B.
low density
C.
low viscosity
D.
low temperature
Ans:
low density
Explanation :
The key to why clouds float is that the density of the same volume of cloud material is less than the density of the same amount of dry air. Just as oil floats on water because it is less dense, clouds float on air because the moist air in clouds is less dense than dry air.
[14] Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
A.
Scattering
B.
Diffraction
C.
Interference
D.
Polarization
Ans:
Scattering
Explanation :
Sir C.V. Raman was awarded Nobel Prize for his work scattering of radiation. Sir Chandrashekhara Venkata Raman was an Indian physicist born in the former Madras Province in India.
[15] Removal of carbon particles from air involves the principle of -
A.
Precipitation
B.
Filteration
C.
Electrophoresis
D.
Sedimentation
Ans:
Electrophoresis
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon particles from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[16] The focal length of a plane mirror is .
A.
Positive
B.
Negative
C.
Zero
D.
Infinity
Ans:
Infinity
Explanation :
A plane mirror is a mirror with a flat reflective surface. The focal length of a plane mirror is infinity. Its optical power is zero.
[17] The wire having a green plastic covering is a .
A.
Line wire
B.
Neutral wire
C.
Earth wire
D.
None of these
Ans:
Earth wire
Explanation :
The earth wire is a crucial part of the home electrical system and is designed to protect against electric shock.
[18] Who among the following invented battery?
A.
Rudolf Diesel
B.
Alfred Noble
C.
Alessandro Volta
D.
John Napier
Ans:
Alessandro Volta
Explanation :
Alessandro Giuseppe Antonio Anastasio Volta was an Italian physicist, chemist, and a pioneer of electricity and power, who is credited as the inventor of the electric battery and the discoverer of methane.
[19] The centre of the reflecting surface of a spherical mirror is called the :
A.
Radius
B.
Centre of Curvature
C.
Pole
D.
Focus
Ans:
Pole
Explanation :
The center of the reflecting surface of a spherical mirror is called as the pole of the mirror which is mainly known as the center of curvature.
[20] If a bomb dropped from an airplane explodes in mid-air .
A.
its KE increases
B.
its total energy increases
C.
its total energy decreases
D.
its total momentum decreases
Ans:
its KE increases
Explanation :
The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
[21] The phenomenon of radioactivity was discovered by -
A.
Marie Curie
B.
Pierre Curie
C.
Henri Becquerel
D.
J.J Thomson
Ans:
Henri Becquerel
Explanation :
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[22] Energy travels from Sun to Earth through –
A.
conduction
B.
convection
C.
radiation
D.
modulation
Ans:
radiation
Explanation :
Solar energy, in the form of heat and light, travels from the sun to Earth through the process of radiation. This way, energy can be transferred through empty space without relying on matter. This radiation is largely visible as light to the naked eye, although it also includes ultraviolet and infrared radiation as well.
[23] Rain drops acquire spherical shape due to -
A.
viscosity
B.
surface tension
C.
friction
D.
elasticity
Ans:
surface tension
Explanation :
The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.
[24] Pieces of camphor placed on water move about rapidly. This is because of -
A.
diffusion
B.
viscosity
C.
surface tension
D.
capillarity
Ans:
surface tension
Explanation :
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
[25] Which among the following is a vector quantity?
A.
Heat
B.
Angular momentum
C.
Work
D.
Time
Ans:
Angular momentum
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.
Explanation :
The Planck constant has dimensions of physical action; these are the same as those of angular momentum, i.e., energy multiplied by time, or momentum multiplied by distance.
[12] If a wire of resistance R is melted and recast to half of its length, then the new resistance of the wire will be -
A.
R/4
B.
R/2
C.
R
D.
2R
Ans:
R/4
Explanation :
0
[13] Clouds float in the atmosphere because of their –
A.
low pressure
B.
low density
C.
low viscosity
D.
low temperature
Ans:
low density
Explanation :
The key to why clouds float is that the density of the same volume of cloud material is less than the density of the same amount of dry air. Just as oil floats on water because it is less dense, clouds float on air because the moist air in clouds is less dense than dry air.
[14] Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
A.
Scattering
B.
Diffraction
C.
Interference
D.
Polarization
Ans:
Scattering
Explanation :
Sir C.V. Raman was awarded Nobel Prize for his work scattering of radiation. Sir Chandrashekhara Venkata Raman was an Indian physicist born in the former Madras Province in India.
[15] Removal of carbon particles from air involves the principle of -
A.
Precipitation
B.
Filteration
C.
Electrophoresis
D.
Sedimentation
Ans:
Electrophoresis
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon particles from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[16] The focal length of a plane mirror is .
A.
Positive
B.
Negative
C.
Zero
D.
Infinity
Ans:
Infinity
Explanation :
A plane mirror is a mirror with a flat reflective surface. The focal length of a plane mirror is infinity. Its optical power is zero.
[17] The wire having a green plastic covering is a .
A.
Line wire
B.
Neutral wire
C.
Earth wire
D.
None of these
Ans:
Earth wire
Explanation :
The earth wire is a crucial part of the home electrical system and is designed to protect against electric shock.
[18] Who among the following invented battery?
A.
Rudolf Diesel
B.
Alfred Noble
C.
Alessandro Volta
D.
John Napier
Ans:
Alessandro Volta
Explanation :
Alessandro Giuseppe Antonio Anastasio Volta was an Italian physicist, chemist, and a pioneer of electricity and power, who is credited as the inventor of the electric battery and the discoverer of methane.
[19] The centre of the reflecting surface of a spherical mirror is called the :
A.
Radius
B.
Centre of Curvature
C.
Pole
D.
Focus
Ans:
Pole
Explanation :
The center of the reflecting surface of a spherical mirror is called as the pole of the mirror which is mainly known as the center of curvature.
[20] If a bomb dropped from an airplane explodes in mid-air .
A.
its KE increases
B.
its total energy increases
C.
its total energy decreases
D.
its total momentum decreases
Ans:
its KE increases
Explanation :
The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
[21] The phenomenon of radioactivity was discovered by -
A.
Marie Curie
B.
Pierre Curie
C.
Henri Becquerel
D.
J.J Thomson
Ans:
Henri Becquerel
Explanation :
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[22] Energy travels from Sun to Earth through –
A.
conduction
B.
convection
C.
radiation
D.
modulation
Ans:
radiation
Explanation :
Solar energy, in the form of heat and light, travels from the sun to Earth through the process of radiation. This way, energy can be transferred through empty space without relying on matter. This radiation is largely visible as light to the naked eye, although it also includes ultraviolet and infrared radiation as well.
[23] Rain drops acquire spherical shape due to -
A.
viscosity
B.
surface tension
C.
friction
D.
elasticity
Ans:
surface tension
Explanation :
The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.
[24] Pieces of camphor placed on water move about rapidly. This is because of -
A.
diffusion
B.
viscosity
C.
surface tension
D.
capillarity
Ans:
surface tension
Explanation :
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
[25] Which among the following is a vector quantity?
A.
Heat
B.
Angular momentum
C.
Work
D.
Time
Ans:
Angular momentum
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.
Explanation :
The key to why clouds float is that the density of the same volume of cloud material is less than the density of the same amount of dry air. Just as oil floats on water because it is less dense, clouds float on air because the moist air in clouds is less dense than dry air.
[14] Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
A.
Scattering
B.
Diffraction
C.
Interference
D.
Polarization
Ans:
Scattering
Explanation :
Sir C.V. Raman was awarded Nobel Prize for his work scattering of radiation. Sir Chandrashekhara Venkata Raman was an Indian physicist born in the former Madras Province in India.
[15] Removal of carbon particles from air involves the principle of -
A.
Precipitation
B.
Filteration
C.
Electrophoresis
D.
Sedimentation
Ans:
Electrophoresis
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon particles from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[16] The focal length of a plane mirror is .
A.
Positive
B.
Negative
C.
Zero
D.
Infinity
Ans:
Infinity
Explanation :
A plane mirror is a mirror with a flat reflective surface. The focal length of a plane mirror is infinity. Its optical power is zero.
[17] The wire having a green plastic covering is a .
A.
Line wire
B.
Neutral wire
C.
Earth wire
D.
None of these
Ans:
Earth wire
Explanation :
The earth wire is a crucial part of the home electrical system and is designed to protect against electric shock.
[18] Who among the following invented battery?
A.
Rudolf Diesel
B.
Alfred Noble
C.
Alessandro Volta
D.
John Napier
Ans:
Alessandro Volta
Explanation :
Alessandro Giuseppe Antonio Anastasio Volta was an Italian physicist, chemist, and a pioneer of electricity and power, who is credited as the inventor of the electric battery and the discoverer of methane.
[19] The centre of the reflecting surface of a spherical mirror is called the :
A.
Radius
B.
Centre of Curvature
C.
Pole
D.
Focus
Ans:
Pole
Explanation :
The center of the reflecting surface of a spherical mirror is called as the pole of the mirror which is mainly known as the center of curvature.
[20] If a bomb dropped from an airplane explodes in mid-air .
A.
its KE increases
B.
its total energy increases
C.
its total energy decreases
D.
its total momentum decreases
Ans:
its KE increases
Explanation :
The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
[21] The phenomenon of radioactivity was discovered by -
A.
Marie Curie
B.
Pierre Curie
C.
Henri Becquerel
D.
J.J Thomson
Ans:
Henri Becquerel
Explanation :
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[22] Energy travels from Sun to Earth through –
A.
conduction
B.
convection
C.
radiation
D.
modulation
Ans:
radiation
Explanation :
Solar energy, in the form of heat and light, travels from the sun to Earth through the process of radiation. This way, energy can be transferred through empty space without relying on matter. This radiation is largely visible as light to the naked eye, although it also includes ultraviolet and infrared radiation as well.
[23] Rain drops acquire spherical shape due to -
A.
viscosity
B.
surface tension
C.
friction
D.
elasticity
Ans:
surface tension
Explanation :
The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.
[24] Pieces of camphor placed on water move about rapidly. This is because of -
A.
diffusion
B.
viscosity
C.
surface tension
D.
capillarity
Ans:
surface tension
Explanation :
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
[25] Which among the following is a vector quantity?
A.
Heat
B.
Angular momentum
C.
Work
D.
Time
Ans:
Angular momentum
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.
Explanation :
Carbon particles in air are colloidal in nature and carry negative charge. The removal of carbon particles from air involves the principle of electrophoresis. Carbon particles get precipitated by losing their charge and, thus, the air which finally comes out is free from them.
[16] The focal length of a plane mirror is .
A.
Positive
B.
Negative
C.
Zero
D.
Infinity
Ans:
Infinity
Explanation :
A plane mirror is a mirror with a flat reflective surface. The focal length of a plane mirror is infinity. Its optical power is zero.
[17] The wire having a green plastic covering is a .
A.
Line wire
B.
Neutral wire
C.
Earth wire
D.
None of these
Ans:
Earth wire
Explanation :
The earth wire is a crucial part of the home electrical system and is designed to protect against electric shock.
[18] Who among the following invented battery?
A.
Rudolf Diesel
B.
Alfred Noble
C.
Alessandro Volta
D.
John Napier
Ans:
Alessandro Volta
Explanation :
Alessandro Giuseppe Antonio Anastasio Volta was an Italian physicist, chemist, and a pioneer of electricity and power, who is credited as the inventor of the electric battery and the discoverer of methane.
[19] The centre of the reflecting surface of a spherical mirror is called the :
A.
Radius
B.
Centre of Curvature
C.
Pole
D.
Focus
Ans:
Pole
Explanation :
The center of the reflecting surface of a spherical mirror is called as the pole of the mirror which is mainly known as the center of curvature.
[20] If a bomb dropped from an airplane explodes in mid-air .
A.
its KE increases
B.
its total energy increases
C.
its total energy decreases
D.
its total momentum decreases
Ans:
its KE increases
Explanation :
The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
[21] The phenomenon of radioactivity was discovered by -
A.
Marie Curie
B.
Pierre Curie
C.
Henri Becquerel
D.
J.J Thomson
Ans:
Henri Becquerel
Explanation :
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[22] Energy travels from Sun to Earth through –
A.
conduction
B.
convection
C.
radiation
D.
modulation
Ans:
radiation
Explanation :
Solar energy, in the form of heat and light, travels from the sun to Earth through the process of radiation. This way, energy can be transferred through empty space without relying on matter. This radiation is largely visible as light to the naked eye, although it also includes ultraviolet and infrared radiation as well.
[23] Rain drops acquire spherical shape due to -
A.
viscosity
B.
surface tension
C.
friction
D.
elasticity
Ans:
surface tension
Explanation :
The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.
[24] Pieces of camphor placed on water move about rapidly. This is because of -
A.
diffusion
B.
viscosity
C.
surface tension
D.
capillarity
Ans:
surface tension
Explanation :
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
[25] Which among the following is a vector quantity?
A.
Heat
B.
Angular momentum
C.
Work
D.
Time
Ans:
Angular momentum
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.
Explanation :
The earth wire is a crucial part of the home electrical system and is designed to protect against electric shock.
[18] Who among the following invented battery?
A.
Rudolf Diesel
B.
Alfred Noble
C.
Alessandro Volta
D.
John Napier
Ans:
Alessandro Volta
Explanation :
Alessandro Giuseppe Antonio Anastasio Volta was an Italian physicist, chemist, and a pioneer of electricity and power, who is credited as the inventor of the electric battery and the discoverer of methane.
[19] The centre of the reflecting surface of a spherical mirror is called the :
A.
Radius
B.
Centre of Curvature
C.
Pole
D.
Focus
Ans:
Pole
Explanation :
The center of the reflecting surface of a spherical mirror is called as the pole of the mirror which is mainly known as the center of curvature.
[20] If a bomb dropped from an airplane explodes in mid-air .
A.
its KE increases
B.
its total energy increases
C.
its total energy decreases
D.
its total momentum decreases
Ans:
its KE increases
Explanation :
The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
[21] The phenomenon of radioactivity was discovered by -
A.
Marie Curie
B.
Pierre Curie
C.
Henri Becquerel
D.
J.J Thomson
Ans:
Henri Becquerel
Explanation :
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[22] Energy travels from Sun to Earth through –
A.
conduction
B.
convection
C.
radiation
D.
modulation
Ans:
radiation
Explanation :
Solar energy, in the form of heat and light, travels from the sun to Earth through the process of radiation. This way, energy can be transferred through empty space without relying on matter. This radiation is largely visible as light to the naked eye, although it also includes ultraviolet and infrared radiation as well.
[23] Rain drops acquire spherical shape due to -
A.
viscosity
B.
surface tension
C.
friction
D.
elasticity
Ans:
surface tension
Explanation :
The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.
[24] Pieces of camphor placed on water move about rapidly. This is because of -
A.
diffusion
B.
viscosity
C.
surface tension
D.
capillarity
Ans:
surface tension
Explanation :
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
[25] Which among the following is a vector quantity?
A.
Heat
B.
Angular momentum
C.
Work
D.
Time
Ans:
Angular momentum
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.
Explanation :
The center of the reflecting surface of a spherical mirror is called as the pole of the mirror which is mainly known as the center of curvature.
[20] If a bomb dropped from an airplane explodes in mid-air .
A.
its KE increases
B.
its total energy increases
C.
its total energy decreases
D.
its total momentum decreases
Ans:
its KE increases
Explanation :
The kinetic energy of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.
[21] The phenomenon of radioactivity was discovered by -
A.
Marie Curie
B.
Pierre Curie
C.
Henri Becquerel
D.
J.J Thomson
Ans:
Henri Becquerel
Explanation :
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[22] Energy travels from Sun to Earth through –
A.
conduction
B.
convection
C.
radiation
D.
modulation
Ans:
radiation
Explanation :
Solar energy, in the form of heat and light, travels from the sun to Earth through the process of radiation. This way, energy can be transferred through empty space without relying on matter. This radiation is largely visible as light to the naked eye, although it also includes ultraviolet and infrared radiation as well.
[23] Rain drops acquire spherical shape due to -
A.
viscosity
B.
surface tension
C.
friction
D.
elasticity
Ans:
surface tension
Explanation :
The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.
[24] Pieces of camphor placed on water move about rapidly. This is because of -
A.
diffusion
B.
viscosity
C.
surface tension
D.
capillarity
Ans:
surface tension
Explanation :
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
[25] Which among the following is a vector quantity?
A.
Heat
B.
Angular momentum
C.
Work
D.
Time
Ans:
Angular momentum
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.
Explanation :
In 1896 Henri Becquerel was using naturally fluorescent minerals to study the properties of x-rays, which had been discovered in 1895 by Wilhelm Roentgen.
[22] Energy travels from Sun to Earth through –
A.
conduction
B.
convection
C.
radiation
D.
modulation
Ans:
radiation
Explanation :
Solar energy, in the form of heat and light, travels from the sun to Earth through the process of radiation. This way, energy can be transferred through empty space without relying on matter. This radiation is largely visible as light to the naked eye, although it also includes ultraviolet and infrared radiation as well.
[23] Rain drops acquire spherical shape due to -
A.
viscosity
B.
surface tension
C.
friction
D.
elasticity
Ans:
surface tension
Explanation :
The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.
[24] Pieces of camphor placed on water move about rapidly. This is because of -
A.
diffusion
B.
viscosity
C.
surface tension
D.
capillarity
Ans:
surface tension
Explanation :
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
[25] Which among the following is a vector quantity?
A.
Heat
B.
Angular momentum
C.
Work
D.
Time
Ans:
Angular momentum
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.
Explanation :
The Surface tension pulls the surface of the drop equally at all points thus produces the spherical shape having the minimum surface area.
[24] Pieces of camphor placed on water move about rapidly. This is because of -
A.
diffusion
B.
viscosity
C.
surface tension
D.
capillarity
Ans:
surface tension
Explanation :
The Camphor slowly dissolves in the water lowering the latter's surface tension in the immediate neighbourhood. When after sometime the whole surface settles for the reduced tension, the movement of the camphor too short.
[25] Which among the following is a vector quantity?
A.
Heat
B.
Angular momentum
C.
Work
D.
Time
Ans:
Angular momentum
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.
Explanation :
Angular momentum is a vector quantity that represents the product of a body's rotational inertia and rotational velocity about a particular axis.