[1] Earth is also known as –
A.
Orange planet
B.
Green planet
C.
Blue planet
D.
Yellow planet
Ans:
Blue planet
Explanation :
Planet Earth has been called the "Blue Planet" due to the abundant water on its surface. Here on Earth, we take liquid water for granted; after all, our bodies are mostly made of water. However, liquid water is a rare commodity in our solar system.
[2] The energy that can harness heat stored below the earth's surface is known as –
A.
thermal energy
B.
nuclear energy
C.
tidal energy
D.
geothermal energy
Ans:
geothermal energy
Explanation :
Geothermal energy is thermal energy generated and stored in the Earth. The Geothermal energy of the Earth's crust originates from the original formation of the planet (20%) and from radi oactive decay of minerals (80%). Current worldwide installed capacity is 10,715 megawatts (MW), with the largest capacity in the United States (3,086 MW), Philippines, and Indonesia.
[3] Green house effect is the heating up of the Earth's atmosphere which is due to –
A.
the ultraviolet rays
B.
y-rays
C.
the infra-red rays
D.
X-rays
Ans:
the infra-red rays
Explanation :
The greenhouse effect refers to circumstances where the short wavelengths of visible light from the sun pass through a transparent medium and are absorbed, but the longer wavelengths of the infrared re- radiation from the heated objects are unable to pass through that medium. The trapping of the long wavelength radiation leads to more heating and a higher resultant temperature.
[4] Which one of the following is used for sun glasses?
A.
Pyrex glass
B.
Flint glass
C.
Crooks glass
D.
Crystal glass
Ans:
Crooks glass
Explanation :
A type of glass that contains cerium and other rare earths and has a high absorption of ultraviolet radiation is used in sunglasses. Sunglasses or sun glasses are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes. They can sometimes also function as a visual aid, as variously termed spectacles or glasses exist, featuring lenses that are coloured, polarized or darkened.
[5] If the phase difference between two points is 120° for a wave with velocity of 360 m/ and frequency 500 Hz, then path difference between the two points is –
A.
1 cm
B.
6 cm
C.
12 cm
D.
24 cm
Ans:
24 cm
Explanation :
0
[6] The colour of sky appears blue due to –
A.
reflection
B.
refraction
C.
scattering of shorter wave lengths
D.
dispersion
Ans:
scattering of shorter wave lengths
Explanation :
The sunlit sky is blue because air scatters short-wavelength light more than longer wavelengths. Since blue light is at the short wavelength end of the visible spectrum, it is more strongly scattered in the atmosphere than long wavelength red light. The result is that the human eye perceives blue when looking toward parts of the sky other than the sun.
[7] Materials for rain proof coats and tents owe their water proof properties to –
A.
Surface tension
B.
Viscosity
C.
Specific gravity
D.
Elasticity
Ans:
Surface tension
Explanation :
Materials for rain proof coats and tents owe their water proof properties to Surface Tension. The surface of a liquid behaves like an elastic membrane and therefore, has a tendency to contract. This property of liquid is called Surface Tension.
[8] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states if no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[9] A particle is moving in a uniform circular motion with constant speed v along a circle of radius r. The acceleration-of the particle is -
A.
zero
B.
V/r
C.
V/r²
D.
V²/r
Ans:
V²/r
Explanation :
When a particle is moving in a uniform circular motion with constant speed and radius. the acceleration of the particle is given by v2/r. The particle will exhibit centripetal acceleration.
[10] Which of the following are bad conductors of electricity?
A.
Mica and Quartz
B.
Metals and Rubber
C.
Metals and Mica
D.
Mica and Rubber
Ans:
Mica and Quartz
Explanation :
Metals are good conductors of electricity, because they have free electrons. Micaand quartz are examples of insulators (bad conductors of electricity), they don't have free electrons.
[11] What was invented by 'Zacharias Janssen'?
A.
Telescope
B.
Microscope
C.
Stethoscope
D.
Periscope
Ans:
Microscope
Explanation :
Zacharias Janssen, credited with inventing the microscope. For millennia, the smallest thing humans could see was about as wide as a human hair. When the microscope was invented around 1590, suddenly we saw a new world of living things in our water, in our food and under our nose.
[12] The unit of measurement of noise is –
A.
Decibel
B.
Hertz
C.
Amplifier
D.
Acoustics
Ans:
Decibel
Explanation :
The decibel (dB) is the unit used to measure the intensity of sound or noise level. It is given in terms of a logarithmic function of a ratio of power intensities. One decibel is one tenth of one bel, named in honor of Alexander Graham Bell who was the inventor of the telephone and phonograph.
[13] Which of the following devices can be used to detect radiant heat?
A.
Liquid thermometer
B.
Six's maximum and minimum thermometer
C.
Constant volume air thermometer
D.
Thermopile
Ans:
Thermopile
Explanation :
Based on the thermoelectric effect, the thermopile can be used as a heat sensor to measure thermal radiation. A thermopile is made of thermocouple junction pairs connected electrically in series. Thermo- couples near the ground measures radiant energy.
[14] In which one of the following the phenomenon of total internal reflection of light is used?
A.
Formation of mirage
B.
Working of binoculars
C.
Formation of rainbow
D.
Twinkling of stars
Ans:
Formation of rainbow
Explanation :
When the angle of incidence is greater than the critical angle, no refraction occurs. Instead, the incident beam is reflected, obeying the Law of Reflection. This is called Total internal reflection. In the formation of a rainbow, Total Internal Reflection occurs at the rear of the raindrop - the water-to-air interface.
[15] Period of oscillation of 3 cm microwaves in seconds is –
A.
1 x 10¹⁰
B.
1 x 10⁻¹⁰
C.
0.01
D.
0.001
Ans:
1 x 10⁻¹⁰
Explanation :
The period of oscillation of 3 cm microwaves is 1 x 10-10 (Physics, Volume 1, by Halliday). The period of oscillation is the smallest interval of time in which a system undergoing oscillation returns to the state it was in at the beginning of the oscillation.
[16] When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?
A.
Hydrogen bond formation
B.
Vander waals forces
C.
Covalent attraction
D.
Dipole interaction
Ans:
Hydrogen bond formation
Explanation :
When two ice cubes are pressed together, they join to form one cube due to hydrogen bond.
[17] For which Diode is used?
A.
modulation
B.
oscillation
C.
amplification
D.
purificationin
Ans:
purificationin
Explanation :
The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking current in the opposite direction (the reverse direction). This unidirectional behavior is called rectification or verification and is used to convert alternating current to direct current, including extraction of modulation from radio signals in radio receivers—these diodes are forms of rectifiers diode is a two-terminal electronic component with an asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction, and high (ideally infinite) resistance in the other.
[18] The force which opposes the relative motion between different layers of liquid or gases is called -
A.
Critical Velocity
B.
Streamline Flow
C.
Terminal Velocity
D.
Viscous Force
Ans:
Viscous Force
Explanation :
Critical Velocity – The maximum velocity upto which fluid motion is streamline is called Critical Velocity. Streamline Flow – If velocity of all fluid particles is same all the time then it can be said in streamline flow.
[19] Water has maximum density at .
A.
0 C
B.
-15 C
C.
4 C
D.
15 C
Ans:
4 C
Explanation :
Water has maximum density at 4 degrees C turns out to be the temperature at which liquid water has the highest density. If you heat it or cool it, it will expand.
[20] Who among the following developed the technology of underground nuclear explosion?
A.
Dr. Homi J. Bhabha
B.
Dr. Vikram Sarabhai
C.
Dr. Raja Ramanna
D.
Dr. P. K. Iyengar
Ans:
Dr. Homi J. Bhabha
Explanation :
Homi Jehangir Bhabha was an Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research. Colloquially known as “father of Indian nuclear programme,” Bhabha gained international prominence after deriving a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering. His major contribution included his work on Compton scattering, R process, and furthermore the advancement of nuclear physics. He was awarded Padma Bhushan by Government of India in 1954.
[21] Sensitivity of the human eye is maximum in the –
A.
Violet region
B.
Green region
C.
Blue region
D.
Red region
Ans:
Green region
Explanation :
The human eye is sensible to light wave which wavelength is roughly between 400 nm and 700 nm. When illumination is enough (in daylight) the maximum sensitivity is in the green region at 555 nm.
[22] The speed of light in air is –
A.
3 x 10⁸ m/s
B.
3 x 10⁻⁸ cm/s
C.
8 x 10³ m/s
D.
Infinity
Ans:
3 x 10⁸ m/s
Explanation :
Speed of light (in Media) = Speed of Light (in Vacuum) / Refreactive Index of Material. Speed of light in air as taken generally is 3 X 10 power 8 meter per second.
[23] The speed of light with the rise in the temperature of the medium :
A.
Increases
B.
Decreases
C.
Remains unaltered
D.
Drops suddenly
Ans:
Remains unaltered
Explanation :
The speed of light with the rise in the temperature of the medium remains unaltered because speed of light doesn't depend on temperature. It does depend, however, on the refractive index of the substance it is travelling through. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.
[24] A rocket works on the principle of conservation of .
A.
mass
B.
linear momentum
C.
energy
D.
angular momentum
Ans:
linear momentum
Explanation :
A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
[25] The swing of a spinning cricket ball in air can be explained on the basis of –
A.
Sudden change in wind direction.
B.
Buoyancy of air.
C.
Turbulence caused by wind.
D.
Bernoulli's theorem.
Ans:
Turbulence caused by wind.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.
Explanation :
Planet Earth has been called the "Blue Planet" due to the abundant water on its surface. Here on Earth, we take liquid water for granted; after all, our bodies are mostly made of water. However, liquid water is a rare commodity in our solar system.
[2] The energy that can harness heat stored below the earth's surface is known as –
A.
thermal energy
B.
nuclear energy
C.
tidal energy
D.
geothermal energy
Ans:
geothermal energy
Explanation :
Geothermal energy is thermal energy generated and stored in the Earth. The Geothermal energy of the Earth's crust originates from the original formation of the planet (20%) and from radi oactive decay of minerals (80%). Current worldwide installed capacity is 10,715 megawatts (MW), with the largest capacity in the United States (3,086 MW), Philippines, and Indonesia.
[3] Green house effect is the heating up of the Earth's atmosphere which is due to –
A.
the ultraviolet rays
B.
y-rays
C.
the infra-red rays
D.
X-rays
Ans:
the infra-red rays
Explanation :
The greenhouse effect refers to circumstances where the short wavelengths of visible light from the sun pass through a transparent medium and are absorbed, but the longer wavelengths of the infrared re- radiation from the heated objects are unable to pass through that medium. The trapping of the long wavelength radiation leads to more heating and a higher resultant temperature.
[4] Which one of the following is used for sun glasses?
A.
Pyrex glass
B.
Flint glass
C.
Crooks glass
D.
Crystal glass
Ans:
Crooks glass
Explanation :
A type of glass that contains cerium and other rare earths and has a high absorption of ultraviolet radiation is used in sunglasses. Sunglasses or sun glasses are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes. They can sometimes also function as a visual aid, as variously termed spectacles or glasses exist, featuring lenses that are coloured, polarized or darkened.
[5] If the phase difference between two points is 120° for a wave with velocity of 360 m/ and frequency 500 Hz, then path difference between the two points is –
A.
1 cm
B.
6 cm
C.
12 cm
D.
24 cm
Ans:
24 cm
Explanation :
0
[6] The colour of sky appears blue due to –
A.
reflection
B.
refraction
C.
scattering of shorter wave lengths
D.
dispersion
Ans:
scattering of shorter wave lengths
Explanation :
The sunlit sky is blue because air scatters short-wavelength light more than longer wavelengths. Since blue light is at the short wavelength end of the visible spectrum, it is more strongly scattered in the atmosphere than long wavelength red light. The result is that the human eye perceives blue when looking toward parts of the sky other than the sun.
[7] Materials for rain proof coats and tents owe their water proof properties to –
A.
Surface tension
B.
Viscosity
C.
Specific gravity
D.
Elasticity
Ans:
Surface tension
Explanation :
Materials for rain proof coats and tents owe their water proof properties to Surface Tension. The surface of a liquid behaves like an elastic membrane and therefore, has a tendency to contract. This property of liquid is called Surface Tension.
[8] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states if no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[9] A particle is moving in a uniform circular motion with constant speed v along a circle of radius r. The acceleration-of the particle is -
A.
zero
B.
V/r
C.
V/r²
D.
V²/r
Ans:
V²/r
Explanation :
When a particle is moving in a uniform circular motion with constant speed and radius. the acceleration of the particle is given by v2/r. The particle will exhibit centripetal acceleration.
[10] Which of the following are bad conductors of electricity?
A.
Mica and Quartz
B.
Metals and Rubber
C.
Metals and Mica
D.
Mica and Rubber
Ans:
Mica and Quartz
Explanation :
Metals are good conductors of electricity, because they have free electrons. Micaand quartz are examples of insulators (bad conductors of electricity), they don't have free electrons.
[11] What was invented by 'Zacharias Janssen'?
A.
Telescope
B.
Microscope
C.
Stethoscope
D.
Periscope
Ans:
Microscope
Explanation :
Zacharias Janssen, credited with inventing the microscope. For millennia, the smallest thing humans could see was about as wide as a human hair. When the microscope was invented around 1590, suddenly we saw a new world of living things in our water, in our food and under our nose.
[12] The unit of measurement of noise is –
A.
Decibel
B.
Hertz
C.
Amplifier
D.
Acoustics
Ans:
Decibel
Explanation :
The decibel (dB) is the unit used to measure the intensity of sound or noise level. It is given in terms of a logarithmic function of a ratio of power intensities. One decibel is one tenth of one bel, named in honor of Alexander Graham Bell who was the inventor of the telephone and phonograph.
[13] Which of the following devices can be used to detect radiant heat?
A.
Liquid thermometer
B.
Six's maximum and minimum thermometer
C.
Constant volume air thermometer
D.
Thermopile
Ans:
Thermopile
Explanation :
Based on the thermoelectric effect, the thermopile can be used as a heat sensor to measure thermal radiation. A thermopile is made of thermocouple junction pairs connected electrically in series. Thermo- couples near the ground measures radiant energy.
[14] In which one of the following the phenomenon of total internal reflection of light is used?
A.
Formation of mirage
B.
Working of binoculars
C.
Formation of rainbow
D.
Twinkling of stars
Ans:
Formation of rainbow
Explanation :
When the angle of incidence is greater than the critical angle, no refraction occurs. Instead, the incident beam is reflected, obeying the Law of Reflection. This is called Total internal reflection. In the formation of a rainbow, Total Internal Reflection occurs at the rear of the raindrop - the water-to-air interface.
[15] Period of oscillation of 3 cm microwaves in seconds is –
A.
1 x 10¹⁰
B.
1 x 10⁻¹⁰
C.
0.01
D.
0.001
Ans:
1 x 10⁻¹⁰
Explanation :
The period of oscillation of 3 cm microwaves is 1 x 10-10 (Physics, Volume 1, by Halliday). The period of oscillation is the smallest interval of time in which a system undergoing oscillation returns to the state it was in at the beginning of the oscillation.
[16] When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?
A.
Hydrogen bond formation
B.
Vander waals forces
C.
Covalent attraction
D.
Dipole interaction
Ans:
Hydrogen bond formation
Explanation :
When two ice cubes are pressed together, they join to form one cube due to hydrogen bond.
[17] For which Diode is used?
A.
modulation
B.
oscillation
C.
amplification
D.
purificationin
Ans:
purificationin
Explanation :
The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking current in the opposite direction (the reverse direction). This unidirectional behavior is called rectification or verification and is used to convert alternating current to direct current, including extraction of modulation from radio signals in radio receivers—these diodes are forms of rectifiers diode is a two-terminal electronic component with an asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction, and high (ideally infinite) resistance in the other.
[18] The force which opposes the relative motion between different layers of liquid or gases is called -
A.
Critical Velocity
B.
Streamline Flow
C.
Terminal Velocity
D.
Viscous Force
Ans:
Viscous Force
Explanation :
Critical Velocity – The maximum velocity upto which fluid motion is streamline is called Critical Velocity. Streamline Flow – If velocity of all fluid particles is same all the time then it can be said in streamline flow.
[19] Water has maximum density at .
A.
0 C
B.
-15 C
C.
4 C
D.
15 C
Ans:
4 C
Explanation :
Water has maximum density at 4 degrees C turns out to be the temperature at which liquid water has the highest density. If you heat it or cool it, it will expand.
[20] Who among the following developed the technology of underground nuclear explosion?
A.
Dr. Homi J. Bhabha
B.
Dr. Vikram Sarabhai
C.
Dr. Raja Ramanna
D.
Dr. P. K. Iyengar
Ans:
Dr. Homi J. Bhabha
Explanation :
Homi Jehangir Bhabha was an Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research. Colloquially known as “father of Indian nuclear programme,” Bhabha gained international prominence after deriving a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering. His major contribution included his work on Compton scattering, R process, and furthermore the advancement of nuclear physics. He was awarded Padma Bhushan by Government of India in 1954.
[21] Sensitivity of the human eye is maximum in the –
A.
Violet region
B.
Green region
C.
Blue region
D.
Red region
Ans:
Green region
Explanation :
The human eye is sensible to light wave which wavelength is roughly between 400 nm and 700 nm. When illumination is enough (in daylight) the maximum sensitivity is in the green region at 555 nm.
[22] The speed of light in air is –
A.
3 x 10⁸ m/s
B.
3 x 10⁻⁸ cm/s
C.
8 x 10³ m/s
D.
Infinity
Ans:
3 x 10⁸ m/s
Explanation :
Speed of light (in Media) = Speed of Light (in Vacuum) / Refreactive Index of Material. Speed of light in air as taken generally is 3 X 10 power 8 meter per second.
[23] The speed of light with the rise in the temperature of the medium :
A.
Increases
B.
Decreases
C.
Remains unaltered
D.
Drops suddenly
Ans:
Remains unaltered
Explanation :
The speed of light with the rise in the temperature of the medium remains unaltered because speed of light doesn't depend on temperature. It does depend, however, on the refractive index of the substance it is travelling through. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.
[24] A rocket works on the principle of conservation of .
A.
mass
B.
linear momentum
C.
energy
D.
angular momentum
Ans:
linear momentum
Explanation :
A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
[25] The swing of a spinning cricket ball in air can be explained on the basis of –
A.
Sudden change in wind direction.
B.
Buoyancy of air.
C.
Turbulence caused by wind.
D.
Bernoulli's theorem.
Ans:
Turbulence caused by wind.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.
Explanation :
The greenhouse effect refers to circumstances where the short wavelengths of visible light from the sun pass through a transparent medium and are absorbed, but the longer wavelengths of the infrared re- radiation from the heated objects are unable to pass through that medium. The trapping of the long wavelength radiation leads to more heating and a higher resultant temperature.
[4] Which one of the following is used for sun glasses?
A.
Pyrex glass
B.
Flint glass
C.
Crooks glass
D.
Crystal glass
Ans:
Crooks glass
Explanation :
A type of glass that contains cerium and other rare earths and has a high absorption of ultraviolet radiation is used in sunglasses. Sunglasses or sun glasses are a form of protective eyewear designed primarily to prevent bright sunlight and high-energy visible light from damaging or discomforting the eyes. They can sometimes also function as a visual aid, as variously termed spectacles or glasses exist, featuring lenses that are coloured, polarized or darkened.
[5] If the phase difference between two points is 120° for a wave with velocity of 360 m/ and frequency 500 Hz, then path difference between the two points is –
A.
1 cm
B.
6 cm
C.
12 cm
D.
24 cm
Ans:
24 cm
Explanation :
0
[6] The colour of sky appears blue due to –
A.
reflection
B.
refraction
C.
scattering of shorter wave lengths
D.
dispersion
Ans:
scattering of shorter wave lengths
Explanation :
The sunlit sky is blue because air scatters short-wavelength light more than longer wavelengths. Since blue light is at the short wavelength end of the visible spectrum, it is more strongly scattered in the atmosphere than long wavelength red light. The result is that the human eye perceives blue when looking toward parts of the sky other than the sun.
[7] Materials for rain proof coats and tents owe their water proof properties to –
A.
Surface tension
B.
Viscosity
C.
Specific gravity
D.
Elasticity
Ans:
Surface tension
Explanation :
Materials for rain proof coats and tents owe their water proof properties to Surface Tension. The surface of a liquid behaves like an elastic membrane and therefore, has a tendency to contract. This property of liquid is called Surface Tension.
[8] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states if no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[9] A particle is moving in a uniform circular motion with constant speed v along a circle of radius r. The acceleration-of the particle is -
A.
zero
B.
V/r
C.
V/r²
D.
V²/r
Ans:
V²/r
Explanation :
When a particle is moving in a uniform circular motion with constant speed and radius. the acceleration of the particle is given by v2/r. The particle will exhibit centripetal acceleration.
[10] Which of the following are bad conductors of electricity?
A.
Mica and Quartz
B.
Metals and Rubber
C.
Metals and Mica
D.
Mica and Rubber
Ans:
Mica and Quartz
Explanation :
Metals are good conductors of electricity, because they have free electrons. Micaand quartz are examples of insulators (bad conductors of electricity), they don't have free electrons.
[11] What was invented by 'Zacharias Janssen'?
A.
Telescope
B.
Microscope
C.
Stethoscope
D.
Periscope
Ans:
Microscope
Explanation :
Zacharias Janssen, credited with inventing the microscope. For millennia, the smallest thing humans could see was about as wide as a human hair. When the microscope was invented around 1590, suddenly we saw a new world of living things in our water, in our food and under our nose.
[12] The unit of measurement of noise is –
A.
Decibel
B.
Hertz
C.
Amplifier
D.
Acoustics
Ans:
Decibel
Explanation :
The decibel (dB) is the unit used to measure the intensity of sound or noise level. It is given in terms of a logarithmic function of a ratio of power intensities. One decibel is one tenth of one bel, named in honor of Alexander Graham Bell who was the inventor of the telephone and phonograph.
[13] Which of the following devices can be used to detect radiant heat?
A.
Liquid thermometer
B.
Six's maximum and minimum thermometer
C.
Constant volume air thermometer
D.
Thermopile
Ans:
Thermopile
Explanation :
Based on the thermoelectric effect, the thermopile can be used as a heat sensor to measure thermal radiation. A thermopile is made of thermocouple junction pairs connected electrically in series. Thermo- couples near the ground measures radiant energy.
[14] In which one of the following the phenomenon of total internal reflection of light is used?
A.
Formation of mirage
B.
Working of binoculars
C.
Formation of rainbow
D.
Twinkling of stars
Ans:
Formation of rainbow
Explanation :
When the angle of incidence is greater than the critical angle, no refraction occurs. Instead, the incident beam is reflected, obeying the Law of Reflection. This is called Total internal reflection. In the formation of a rainbow, Total Internal Reflection occurs at the rear of the raindrop - the water-to-air interface.
[15] Period of oscillation of 3 cm microwaves in seconds is –
A.
1 x 10¹⁰
B.
1 x 10⁻¹⁰
C.
0.01
D.
0.001
Ans:
1 x 10⁻¹⁰
Explanation :
The period of oscillation of 3 cm microwaves is 1 x 10-10 (Physics, Volume 1, by Halliday). The period of oscillation is the smallest interval of time in which a system undergoing oscillation returns to the state it was in at the beginning of the oscillation.
[16] When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?
A.
Hydrogen bond formation
B.
Vander waals forces
C.
Covalent attraction
D.
Dipole interaction
Ans:
Hydrogen bond formation
Explanation :
When two ice cubes are pressed together, they join to form one cube due to hydrogen bond.
[17] For which Diode is used?
A.
modulation
B.
oscillation
C.
amplification
D.
purificationin
Ans:
purificationin
Explanation :
The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking current in the opposite direction (the reverse direction). This unidirectional behavior is called rectification or verification and is used to convert alternating current to direct current, including extraction of modulation from radio signals in radio receivers—these diodes are forms of rectifiers diode is a two-terminal electronic component with an asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction, and high (ideally infinite) resistance in the other.
[18] The force which opposes the relative motion between different layers of liquid or gases is called -
A.
Critical Velocity
B.
Streamline Flow
C.
Terminal Velocity
D.
Viscous Force
Ans:
Viscous Force
Explanation :
Critical Velocity – The maximum velocity upto which fluid motion is streamline is called Critical Velocity. Streamline Flow – If velocity of all fluid particles is same all the time then it can be said in streamline flow.
[19] Water has maximum density at .
A.
0 C
B.
-15 C
C.
4 C
D.
15 C
Ans:
4 C
Explanation :
Water has maximum density at 4 degrees C turns out to be the temperature at which liquid water has the highest density. If you heat it or cool it, it will expand.
[20] Who among the following developed the technology of underground nuclear explosion?
A.
Dr. Homi J. Bhabha
B.
Dr. Vikram Sarabhai
C.
Dr. Raja Ramanna
D.
Dr. P. K. Iyengar
Ans:
Dr. Homi J. Bhabha
Explanation :
Homi Jehangir Bhabha was an Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research. Colloquially known as “father of Indian nuclear programme,” Bhabha gained international prominence after deriving a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering. His major contribution included his work on Compton scattering, R process, and furthermore the advancement of nuclear physics. He was awarded Padma Bhushan by Government of India in 1954.
[21] Sensitivity of the human eye is maximum in the –
A.
Violet region
B.
Green region
C.
Blue region
D.
Red region
Ans:
Green region
Explanation :
The human eye is sensible to light wave which wavelength is roughly between 400 nm and 700 nm. When illumination is enough (in daylight) the maximum sensitivity is in the green region at 555 nm.
[22] The speed of light in air is –
A.
3 x 10⁸ m/s
B.
3 x 10⁻⁸ cm/s
C.
8 x 10³ m/s
D.
Infinity
Ans:
3 x 10⁸ m/s
Explanation :
Speed of light (in Media) = Speed of Light (in Vacuum) / Refreactive Index of Material. Speed of light in air as taken generally is 3 X 10 power 8 meter per second.
[23] The speed of light with the rise in the temperature of the medium :
A.
Increases
B.
Decreases
C.
Remains unaltered
D.
Drops suddenly
Ans:
Remains unaltered
Explanation :
The speed of light with the rise in the temperature of the medium remains unaltered because speed of light doesn't depend on temperature. It does depend, however, on the refractive index of the substance it is travelling through. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.
[24] A rocket works on the principle of conservation of .
A.
mass
B.
linear momentum
C.
energy
D.
angular momentum
Ans:
linear momentum
Explanation :
A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
[25] The swing of a spinning cricket ball in air can be explained on the basis of –
A.
Sudden change in wind direction.
B.
Buoyancy of air.
C.
Turbulence caused by wind.
D.
Bernoulli's theorem.
Ans:
Turbulence caused by wind.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.
Explanation :
0
[6] The colour of sky appears blue due to –
A.
reflection
B.
refraction
C.
scattering of shorter wave lengths
D.
dispersion
Ans:
scattering of shorter wave lengths
Explanation :
The sunlit sky is blue because air scatters short-wavelength light more than longer wavelengths. Since blue light is at the short wavelength end of the visible spectrum, it is more strongly scattered in the atmosphere than long wavelength red light. The result is that the human eye perceives blue when looking toward parts of the sky other than the sun.
[7] Materials for rain proof coats and tents owe their water proof properties to –
A.
Surface tension
B.
Viscosity
C.
Specific gravity
D.
Elasticity
Ans:
Surface tension
Explanation :
Materials for rain proof coats and tents owe their water proof properties to Surface Tension. The surface of a liquid behaves like an elastic membrane and therefore, has a tendency to contract. This property of liquid is called Surface Tension.
[8] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states if no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[9] A particle is moving in a uniform circular motion with constant speed v along a circle of radius r. The acceleration-of the particle is -
A.
zero
B.
V/r
C.
V/r²
D.
V²/r
Ans:
V²/r
Explanation :
When a particle is moving in a uniform circular motion with constant speed and radius. the acceleration of the particle is given by v2/r. The particle will exhibit centripetal acceleration.
[10] Which of the following are bad conductors of electricity?
A.
Mica and Quartz
B.
Metals and Rubber
C.
Metals and Mica
D.
Mica and Rubber
Ans:
Mica and Quartz
Explanation :
Metals are good conductors of electricity, because they have free electrons. Micaand quartz are examples of insulators (bad conductors of electricity), they don't have free electrons.
[11] What was invented by 'Zacharias Janssen'?
A.
Telescope
B.
Microscope
C.
Stethoscope
D.
Periscope
Ans:
Microscope
Explanation :
Zacharias Janssen, credited with inventing the microscope. For millennia, the smallest thing humans could see was about as wide as a human hair. When the microscope was invented around 1590, suddenly we saw a new world of living things in our water, in our food and under our nose.
[12] The unit of measurement of noise is –
A.
Decibel
B.
Hertz
C.
Amplifier
D.
Acoustics
Ans:
Decibel
Explanation :
The decibel (dB) is the unit used to measure the intensity of sound or noise level. It is given in terms of a logarithmic function of a ratio of power intensities. One decibel is one tenth of one bel, named in honor of Alexander Graham Bell who was the inventor of the telephone and phonograph.
[13] Which of the following devices can be used to detect radiant heat?
A.
Liquid thermometer
B.
Six's maximum and minimum thermometer
C.
Constant volume air thermometer
D.
Thermopile
Ans:
Thermopile
Explanation :
Based on the thermoelectric effect, the thermopile can be used as a heat sensor to measure thermal radiation. A thermopile is made of thermocouple junction pairs connected electrically in series. Thermo- couples near the ground measures radiant energy.
[14] In which one of the following the phenomenon of total internal reflection of light is used?
A.
Formation of mirage
B.
Working of binoculars
C.
Formation of rainbow
D.
Twinkling of stars
Ans:
Formation of rainbow
Explanation :
When the angle of incidence is greater than the critical angle, no refraction occurs. Instead, the incident beam is reflected, obeying the Law of Reflection. This is called Total internal reflection. In the formation of a rainbow, Total Internal Reflection occurs at the rear of the raindrop - the water-to-air interface.
[15] Period of oscillation of 3 cm microwaves in seconds is –
A.
1 x 10¹⁰
B.
1 x 10⁻¹⁰
C.
0.01
D.
0.001
Ans:
1 x 10⁻¹⁰
Explanation :
The period of oscillation of 3 cm microwaves is 1 x 10-10 (Physics, Volume 1, by Halliday). The period of oscillation is the smallest interval of time in which a system undergoing oscillation returns to the state it was in at the beginning of the oscillation.
[16] When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?
A.
Hydrogen bond formation
B.
Vander waals forces
C.
Covalent attraction
D.
Dipole interaction
Ans:
Hydrogen bond formation
Explanation :
When two ice cubes are pressed together, they join to form one cube due to hydrogen bond.
[17] For which Diode is used?
A.
modulation
B.
oscillation
C.
amplification
D.
purificationin
Ans:
purificationin
Explanation :
The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking current in the opposite direction (the reverse direction). This unidirectional behavior is called rectification or verification and is used to convert alternating current to direct current, including extraction of modulation from radio signals in radio receivers—these diodes are forms of rectifiers diode is a two-terminal electronic component with an asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction, and high (ideally infinite) resistance in the other.
[18] The force which opposes the relative motion between different layers of liquid or gases is called -
A.
Critical Velocity
B.
Streamline Flow
C.
Terminal Velocity
D.
Viscous Force
Ans:
Viscous Force
Explanation :
Critical Velocity – The maximum velocity upto which fluid motion is streamline is called Critical Velocity. Streamline Flow – If velocity of all fluid particles is same all the time then it can be said in streamline flow.
[19] Water has maximum density at .
A.
0 C
B.
-15 C
C.
4 C
D.
15 C
Ans:
4 C
Explanation :
Water has maximum density at 4 degrees C turns out to be the temperature at which liquid water has the highest density. If you heat it or cool it, it will expand.
[20] Who among the following developed the technology of underground nuclear explosion?
A.
Dr. Homi J. Bhabha
B.
Dr. Vikram Sarabhai
C.
Dr. Raja Ramanna
D.
Dr. P. K. Iyengar
Ans:
Dr. Homi J. Bhabha
Explanation :
Homi Jehangir Bhabha was an Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research. Colloquially known as “father of Indian nuclear programme,” Bhabha gained international prominence after deriving a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering. His major contribution included his work on Compton scattering, R process, and furthermore the advancement of nuclear physics. He was awarded Padma Bhushan by Government of India in 1954.
[21] Sensitivity of the human eye is maximum in the –
A.
Violet region
B.
Green region
C.
Blue region
D.
Red region
Ans:
Green region
Explanation :
The human eye is sensible to light wave which wavelength is roughly between 400 nm and 700 nm. When illumination is enough (in daylight) the maximum sensitivity is in the green region at 555 nm.
[22] The speed of light in air is –
A.
3 x 10⁸ m/s
B.
3 x 10⁻⁸ cm/s
C.
8 x 10³ m/s
D.
Infinity
Ans:
3 x 10⁸ m/s
Explanation :
Speed of light (in Media) = Speed of Light (in Vacuum) / Refreactive Index of Material. Speed of light in air as taken generally is 3 X 10 power 8 meter per second.
[23] The speed of light with the rise in the temperature of the medium :
A.
Increases
B.
Decreases
C.
Remains unaltered
D.
Drops suddenly
Ans:
Remains unaltered
Explanation :
The speed of light with the rise in the temperature of the medium remains unaltered because speed of light doesn't depend on temperature. It does depend, however, on the refractive index of the substance it is travelling through. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.
[24] A rocket works on the principle of conservation of .
A.
mass
B.
linear momentum
C.
energy
D.
angular momentum
Ans:
linear momentum
Explanation :
A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
[25] The swing of a spinning cricket ball in air can be explained on the basis of –
A.
Sudden change in wind direction.
B.
Buoyancy of air.
C.
Turbulence caused by wind.
D.
Bernoulli's theorem.
Ans:
Turbulence caused by wind.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.
Explanation :
Materials for rain proof coats and tents owe their water proof properties to Surface Tension. The surface of a liquid behaves like an elastic membrane and therefore, has a tendency to contract. This property of liquid is called Surface Tension.
[8] If no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant. Which law states this?
A.
Newton first law
B.
Newton second law
C.
Newton third law
D.
Principle of conservation of linear momentum
Ans:
Principle of conservation of linear momentum
Explanation :
Principle of conservation of linear momentum states if no external force acts on a system of bodies, the total linear momentum of the system of bodies remains constant.
[9] A particle is moving in a uniform circular motion with constant speed v along a circle of radius r. The acceleration-of the particle is -
A.
zero
B.
V/r
C.
V/r²
D.
V²/r
Ans:
V²/r
Explanation :
When a particle is moving in a uniform circular motion with constant speed and radius. the acceleration of the particle is given by v2/r. The particle will exhibit centripetal acceleration.
[10] Which of the following are bad conductors of electricity?
A.
Mica and Quartz
B.
Metals and Rubber
C.
Metals and Mica
D.
Mica and Rubber
Ans:
Mica and Quartz
Explanation :
Metals are good conductors of electricity, because they have free electrons. Micaand quartz are examples of insulators (bad conductors of electricity), they don't have free electrons.
[11] What was invented by 'Zacharias Janssen'?
A.
Telescope
B.
Microscope
C.
Stethoscope
D.
Periscope
Ans:
Microscope
Explanation :
Zacharias Janssen, credited with inventing the microscope. For millennia, the smallest thing humans could see was about as wide as a human hair. When the microscope was invented around 1590, suddenly we saw a new world of living things in our water, in our food and under our nose.
[12] The unit of measurement of noise is –
A.
Decibel
B.
Hertz
C.
Amplifier
D.
Acoustics
Ans:
Decibel
Explanation :
The decibel (dB) is the unit used to measure the intensity of sound or noise level. It is given in terms of a logarithmic function of a ratio of power intensities. One decibel is one tenth of one bel, named in honor of Alexander Graham Bell who was the inventor of the telephone and phonograph.
[13] Which of the following devices can be used to detect radiant heat?
A.
Liquid thermometer
B.
Six's maximum and minimum thermometer
C.
Constant volume air thermometer
D.
Thermopile
Ans:
Thermopile
Explanation :
Based on the thermoelectric effect, the thermopile can be used as a heat sensor to measure thermal radiation. A thermopile is made of thermocouple junction pairs connected electrically in series. Thermo- couples near the ground measures radiant energy.
[14] In which one of the following the phenomenon of total internal reflection of light is used?
A.
Formation of mirage
B.
Working of binoculars
C.
Formation of rainbow
D.
Twinkling of stars
Ans:
Formation of rainbow
Explanation :
When the angle of incidence is greater than the critical angle, no refraction occurs. Instead, the incident beam is reflected, obeying the Law of Reflection. This is called Total internal reflection. In the formation of a rainbow, Total Internal Reflection occurs at the rear of the raindrop - the water-to-air interface.
[15] Period of oscillation of 3 cm microwaves in seconds is –
A.
1 x 10¹⁰
B.
1 x 10⁻¹⁰
C.
0.01
D.
0.001
Ans:
1 x 10⁻¹⁰
Explanation :
The period of oscillation of 3 cm microwaves is 1 x 10-10 (Physics, Volume 1, by Halliday). The period of oscillation is the smallest interval of time in which a system undergoing oscillation returns to the state it was in at the beginning of the oscillation.
[16] When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?
A.
Hydrogen bond formation
B.
Vander waals forces
C.
Covalent attraction
D.
Dipole interaction
Ans:
Hydrogen bond formation
Explanation :
When two ice cubes are pressed together, they join to form one cube due to hydrogen bond.
[17] For which Diode is used?
A.
modulation
B.
oscillation
C.
amplification
D.
purificationin
Ans:
purificationin
Explanation :
The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking current in the opposite direction (the reverse direction). This unidirectional behavior is called rectification or verification and is used to convert alternating current to direct current, including extraction of modulation from radio signals in radio receivers—these diodes are forms of rectifiers diode is a two-terminal electronic component with an asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction, and high (ideally infinite) resistance in the other.
[18] The force which opposes the relative motion between different layers of liquid or gases is called -
A.
Critical Velocity
B.
Streamline Flow
C.
Terminal Velocity
D.
Viscous Force
Ans:
Viscous Force
Explanation :
Critical Velocity – The maximum velocity upto which fluid motion is streamline is called Critical Velocity. Streamline Flow – If velocity of all fluid particles is same all the time then it can be said in streamline flow.
[19] Water has maximum density at .
A.
0 C
B.
-15 C
C.
4 C
D.
15 C
Ans:
4 C
Explanation :
Water has maximum density at 4 degrees C turns out to be the temperature at which liquid water has the highest density. If you heat it or cool it, it will expand.
[20] Who among the following developed the technology of underground nuclear explosion?
A.
Dr. Homi J. Bhabha
B.
Dr. Vikram Sarabhai
C.
Dr. Raja Ramanna
D.
Dr. P. K. Iyengar
Ans:
Dr. Homi J. Bhabha
Explanation :
Homi Jehangir Bhabha was an Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research. Colloquially known as “father of Indian nuclear programme,” Bhabha gained international prominence after deriving a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering. His major contribution included his work on Compton scattering, R process, and furthermore the advancement of nuclear physics. He was awarded Padma Bhushan by Government of India in 1954.
[21] Sensitivity of the human eye is maximum in the –
A.
Violet region
B.
Green region
C.
Blue region
D.
Red region
Ans:
Green region
Explanation :
The human eye is sensible to light wave which wavelength is roughly between 400 nm and 700 nm. When illumination is enough (in daylight) the maximum sensitivity is in the green region at 555 nm.
[22] The speed of light in air is –
A.
3 x 10⁸ m/s
B.
3 x 10⁻⁸ cm/s
C.
8 x 10³ m/s
D.
Infinity
Ans:
3 x 10⁸ m/s
Explanation :
Speed of light (in Media) = Speed of Light (in Vacuum) / Refreactive Index of Material. Speed of light in air as taken generally is 3 X 10 power 8 meter per second.
[23] The speed of light with the rise in the temperature of the medium :
A.
Increases
B.
Decreases
C.
Remains unaltered
D.
Drops suddenly
Ans:
Remains unaltered
Explanation :
The speed of light with the rise in the temperature of the medium remains unaltered because speed of light doesn't depend on temperature. It does depend, however, on the refractive index of the substance it is travelling through. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.
[24] A rocket works on the principle of conservation of .
A.
mass
B.
linear momentum
C.
energy
D.
angular momentum
Ans:
linear momentum
Explanation :
A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
[25] The swing of a spinning cricket ball in air can be explained on the basis of –
A.
Sudden change in wind direction.
B.
Buoyancy of air.
C.
Turbulence caused by wind.
D.
Bernoulli's theorem.
Ans:
Turbulence caused by wind.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.
Explanation :
When a particle is moving in a uniform circular motion with constant speed and radius. the acceleration of the particle is given by v2/r. The particle will exhibit centripetal acceleration.
[10] Which of the following are bad conductors of electricity?
A.
Mica and Quartz
B.
Metals and Rubber
C.
Metals and Mica
D.
Mica and Rubber
Ans:
Mica and Quartz
Explanation :
Metals are good conductors of electricity, because they have free electrons. Micaand quartz are examples of insulators (bad conductors of electricity), they don't have free electrons.
[11] What was invented by 'Zacharias Janssen'?
A.
Telescope
B.
Microscope
C.
Stethoscope
D.
Periscope
Ans:
Microscope
Explanation :
Zacharias Janssen, credited with inventing the microscope. For millennia, the smallest thing humans could see was about as wide as a human hair. When the microscope was invented around 1590, suddenly we saw a new world of living things in our water, in our food and under our nose.
[12] The unit of measurement of noise is –
A.
Decibel
B.
Hertz
C.
Amplifier
D.
Acoustics
Ans:
Decibel
Explanation :
The decibel (dB) is the unit used to measure the intensity of sound or noise level. It is given in terms of a logarithmic function of a ratio of power intensities. One decibel is one tenth of one bel, named in honor of Alexander Graham Bell who was the inventor of the telephone and phonograph.
[13] Which of the following devices can be used to detect radiant heat?
A.
Liquid thermometer
B.
Six's maximum and minimum thermometer
C.
Constant volume air thermometer
D.
Thermopile
Ans:
Thermopile
Explanation :
Based on the thermoelectric effect, the thermopile can be used as a heat sensor to measure thermal radiation. A thermopile is made of thermocouple junction pairs connected electrically in series. Thermo- couples near the ground measures radiant energy.
[14] In which one of the following the phenomenon of total internal reflection of light is used?
A.
Formation of mirage
B.
Working of binoculars
C.
Formation of rainbow
D.
Twinkling of stars
Ans:
Formation of rainbow
Explanation :
When the angle of incidence is greater than the critical angle, no refraction occurs. Instead, the incident beam is reflected, obeying the Law of Reflection. This is called Total internal reflection. In the formation of a rainbow, Total Internal Reflection occurs at the rear of the raindrop - the water-to-air interface.
[15] Period of oscillation of 3 cm microwaves in seconds is –
A.
1 x 10¹⁰
B.
1 x 10⁻¹⁰
C.
0.01
D.
0.001
Ans:
1 x 10⁻¹⁰
Explanation :
The period of oscillation of 3 cm microwaves is 1 x 10-10 (Physics, Volume 1, by Halliday). The period of oscillation is the smallest interval of time in which a system undergoing oscillation returns to the state it was in at the beginning of the oscillation.
[16] When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?
A.
Hydrogen bond formation
B.
Vander waals forces
C.
Covalent attraction
D.
Dipole interaction
Ans:
Hydrogen bond formation
Explanation :
When two ice cubes are pressed together, they join to form one cube due to hydrogen bond.
[17] For which Diode is used?
A.
modulation
B.
oscillation
C.
amplification
D.
purificationin
Ans:
purificationin
Explanation :
The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking current in the opposite direction (the reverse direction). This unidirectional behavior is called rectification or verification and is used to convert alternating current to direct current, including extraction of modulation from radio signals in radio receivers—these diodes are forms of rectifiers diode is a two-terminal electronic component with an asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction, and high (ideally infinite) resistance in the other.
[18] The force which opposes the relative motion between different layers of liquid or gases is called -
A.
Critical Velocity
B.
Streamline Flow
C.
Terminal Velocity
D.
Viscous Force
Ans:
Viscous Force
Explanation :
Critical Velocity – The maximum velocity upto which fluid motion is streamline is called Critical Velocity. Streamline Flow – If velocity of all fluid particles is same all the time then it can be said in streamline flow.
[19] Water has maximum density at .
A.
0 C
B.
-15 C
C.
4 C
D.
15 C
Ans:
4 C
Explanation :
Water has maximum density at 4 degrees C turns out to be the temperature at which liquid water has the highest density. If you heat it or cool it, it will expand.
[20] Who among the following developed the technology of underground nuclear explosion?
A.
Dr. Homi J. Bhabha
B.
Dr. Vikram Sarabhai
C.
Dr. Raja Ramanna
D.
Dr. P. K. Iyengar
Ans:
Dr. Homi J. Bhabha
Explanation :
Homi Jehangir Bhabha was an Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research. Colloquially known as “father of Indian nuclear programme,” Bhabha gained international prominence after deriving a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering. His major contribution included his work on Compton scattering, R process, and furthermore the advancement of nuclear physics. He was awarded Padma Bhushan by Government of India in 1954.
[21] Sensitivity of the human eye is maximum in the –
A.
Violet region
B.
Green region
C.
Blue region
D.
Red region
Ans:
Green region
Explanation :
The human eye is sensible to light wave which wavelength is roughly between 400 nm and 700 nm. When illumination is enough (in daylight) the maximum sensitivity is in the green region at 555 nm.
[22] The speed of light in air is –
A.
3 x 10⁸ m/s
B.
3 x 10⁻⁸ cm/s
C.
8 x 10³ m/s
D.
Infinity
Ans:
3 x 10⁸ m/s
Explanation :
Speed of light (in Media) = Speed of Light (in Vacuum) / Refreactive Index of Material. Speed of light in air as taken generally is 3 X 10 power 8 meter per second.
[23] The speed of light with the rise in the temperature of the medium :
A.
Increases
B.
Decreases
C.
Remains unaltered
D.
Drops suddenly
Ans:
Remains unaltered
Explanation :
The speed of light with the rise in the temperature of the medium remains unaltered because speed of light doesn't depend on temperature. It does depend, however, on the refractive index of the substance it is travelling through. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.
[24] A rocket works on the principle of conservation of .
A.
mass
B.
linear momentum
C.
energy
D.
angular momentum
Ans:
linear momentum
Explanation :
A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
[25] The swing of a spinning cricket ball in air can be explained on the basis of –
A.
Sudden change in wind direction.
B.
Buoyancy of air.
C.
Turbulence caused by wind.
D.
Bernoulli's theorem.
Ans:
Turbulence caused by wind.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.
Explanation :
Zacharias Janssen, credited with inventing the microscope. For millennia, the smallest thing humans could see was about as wide as a human hair. When the microscope was invented around 1590, suddenly we saw a new world of living things in our water, in our food and under our nose.
[12] The unit of measurement of noise is –
A.
Decibel
B.
Hertz
C.
Amplifier
D.
Acoustics
Ans:
Decibel
Explanation :
The decibel (dB) is the unit used to measure the intensity of sound or noise level. It is given in terms of a logarithmic function of a ratio of power intensities. One decibel is one tenth of one bel, named in honor of Alexander Graham Bell who was the inventor of the telephone and phonograph.
[13] Which of the following devices can be used to detect radiant heat?
A.
Liquid thermometer
B.
Six's maximum and minimum thermometer
C.
Constant volume air thermometer
D.
Thermopile
Ans:
Thermopile
Explanation :
Based on the thermoelectric effect, the thermopile can be used as a heat sensor to measure thermal radiation. A thermopile is made of thermocouple junction pairs connected electrically in series. Thermo- couples near the ground measures radiant energy.
[14] In which one of the following the phenomenon of total internal reflection of light is used?
A.
Formation of mirage
B.
Working of binoculars
C.
Formation of rainbow
D.
Twinkling of stars
Ans:
Formation of rainbow
Explanation :
When the angle of incidence is greater than the critical angle, no refraction occurs. Instead, the incident beam is reflected, obeying the Law of Reflection. This is called Total internal reflection. In the formation of a rainbow, Total Internal Reflection occurs at the rear of the raindrop - the water-to-air interface.
[15] Period of oscillation of 3 cm microwaves in seconds is –
A.
1 x 10¹⁰
B.
1 x 10⁻¹⁰
C.
0.01
D.
0.001
Ans:
1 x 10⁻¹⁰
Explanation :
The period of oscillation of 3 cm microwaves is 1 x 10-10 (Physics, Volume 1, by Halliday). The period of oscillation is the smallest interval of time in which a system undergoing oscillation returns to the state it was in at the beginning of the oscillation.
[16] When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?
A.
Hydrogen bond formation
B.
Vander waals forces
C.
Covalent attraction
D.
Dipole interaction
Ans:
Hydrogen bond formation
Explanation :
When two ice cubes are pressed together, they join to form one cube due to hydrogen bond.
[17] For which Diode is used?
A.
modulation
B.
oscillation
C.
amplification
D.
purificationin
Ans:
purificationin
Explanation :
The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking current in the opposite direction (the reverse direction). This unidirectional behavior is called rectification or verification and is used to convert alternating current to direct current, including extraction of modulation from radio signals in radio receivers—these diodes are forms of rectifiers diode is a two-terminal electronic component with an asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction, and high (ideally infinite) resistance in the other.
[18] The force which opposes the relative motion between different layers of liquid or gases is called -
A.
Critical Velocity
B.
Streamline Flow
C.
Terminal Velocity
D.
Viscous Force
Ans:
Viscous Force
Explanation :
Critical Velocity – The maximum velocity upto which fluid motion is streamline is called Critical Velocity. Streamline Flow – If velocity of all fluid particles is same all the time then it can be said in streamline flow.
[19] Water has maximum density at .
A.
0 C
B.
-15 C
C.
4 C
D.
15 C
Ans:
4 C
Explanation :
Water has maximum density at 4 degrees C turns out to be the temperature at which liquid water has the highest density. If you heat it or cool it, it will expand.
[20] Who among the following developed the technology of underground nuclear explosion?
A.
Dr. Homi J. Bhabha
B.
Dr. Vikram Sarabhai
C.
Dr. Raja Ramanna
D.
Dr. P. K. Iyengar
Ans:
Dr. Homi J. Bhabha
Explanation :
Homi Jehangir Bhabha was an Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research. Colloquially known as “father of Indian nuclear programme,” Bhabha gained international prominence after deriving a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering. His major contribution included his work on Compton scattering, R process, and furthermore the advancement of nuclear physics. He was awarded Padma Bhushan by Government of India in 1954.
[21] Sensitivity of the human eye is maximum in the –
A.
Violet region
B.
Green region
C.
Blue region
D.
Red region
Ans:
Green region
Explanation :
The human eye is sensible to light wave which wavelength is roughly between 400 nm and 700 nm. When illumination is enough (in daylight) the maximum sensitivity is in the green region at 555 nm.
[22] The speed of light in air is –
A.
3 x 10⁸ m/s
B.
3 x 10⁻⁸ cm/s
C.
8 x 10³ m/s
D.
Infinity
Ans:
3 x 10⁸ m/s
Explanation :
Speed of light (in Media) = Speed of Light (in Vacuum) / Refreactive Index of Material. Speed of light in air as taken generally is 3 X 10 power 8 meter per second.
[23] The speed of light with the rise in the temperature of the medium :
A.
Increases
B.
Decreases
C.
Remains unaltered
D.
Drops suddenly
Ans:
Remains unaltered
Explanation :
The speed of light with the rise in the temperature of the medium remains unaltered because speed of light doesn't depend on temperature. It does depend, however, on the refractive index of the substance it is travelling through. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.
[24] A rocket works on the principle of conservation of .
A.
mass
B.
linear momentum
C.
energy
D.
angular momentum
Ans:
linear momentum
Explanation :
A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
[25] The swing of a spinning cricket ball in air can be explained on the basis of –
A.
Sudden change in wind direction.
B.
Buoyancy of air.
C.
Turbulence caused by wind.
D.
Bernoulli's theorem.
Ans:
Turbulence caused by wind.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.
Explanation :
Based on the thermoelectric effect, the thermopile can be used as a heat sensor to measure thermal radiation. A thermopile is made of thermocouple junction pairs connected electrically in series. Thermo- couples near the ground measures radiant energy.
[14] In which one of the following the phenomenon of total internal reflection of light is used?
A.
Formation of mirage
B.
Working of binoculars
C.
Formation of rainbow
D.
Twinkling of stars
Ans:
Formation of rainbow
Explanation :
When the angle of incidence is greater than the critical angle, no refraction occurs. Instead, the incident beam is reflected, obeying the Law of Reflection. This is called Total internal reflection. In the formation of a rainbow, Total Internal Reflection occurs at the rear of the raindrop - the water-to-air interface.
[15] Period of oscillation of 3 cm microwaves in seconds is –
A.
1 x 10¹⁰
B.
1 x 10⁻¹⁰
C.
0.01
D.
0.001
Ans:
1 x 10⁻¹⁰
Explanation :
The period of oscillation of 3 cm microwaves is 1 x 10-10 (Physics, Volume 1, by Halliday). The period of oscillation is the smallest interval of time in which a system undergoing oscillation returns to the state it was in at the beginning of the oscillation.
[16] When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?
A.
Hydrogen bond formation
B.
Vander waals forces
C.
Covalent attraction
D.
Dipole interaction
Ans:
Hydrogen bond formation
Explanation :
When two ice cubes are pressed together, they join to form one cube due to hydrogen bond.
[17] For which Diode is used?
A.
modulation
B.
oscillation
C.
amplification
D.
purificationin
Ans:
purificationin
Explanation :
The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking current in the opposite direction (the reverse direction). This unidirectional behavior is called rectification or verification and is used to convert alternating current to direct current, including extraction of modulation from radio signals in radio receivers—these diodes are forms of rectifiers diode is a two-terminal electronic component with an asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction, and high (ideally infinite) resistance in the other.
[18] The force which opposes the relative motion between different layers of liquid or gases is called -
A.
Critical Velocity
B.
Streamline Flow
C.
Terminal Velocity
D.
Viscous Force
Ans:
Viscous Force
Explanation :
Critical Velocity – The maximum velocity upto which fluid motion is streamline is called Critical Velocity. Streamline Flow – If velocity of all fluid particles is same all the time then it can be said in streamline flow.
[19] Water has maximum density at .
A.
0 C
B.
-15 C
C.
4 C
D.
15 C
Ans:
4 C
Explanation :
Water has maximum density at 4 degrees C turns out to be the temperature at which liquid water has the highest density. If you heat it or cool it, it will expand.
[20] Who among the following developed the technology of underground nuclear explosion?
A.
Dr. Homi J. Bhabha
B.
Dr. Vikram Sarabhai
C.
Dr. Raja Ramanna
D.
Dr. P. K. Iyengar
Ans:
Dr. Homi J. Bhabha
Explanation :
Homi Jehangir Bhabha was an Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research. Colloquially known as “father of Indian nuclear programme,” Bhabha gained international prominence after deriving a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering. His major contribution included his work on Compton scattering, R process, and furthermore the advancement of nuclear physics. He was awarded Padma Bhushan by Government of India in 1954.
[21] Sensitivity of the human eye is maximum in the –
A.
Violet region
B.
Green region
C.
Blue region
D.
Red region
Ans:
Green region
Explanation :
The human eye is sensible to light wave which wavelength is roughly between 400 nm and 700 nm. When illumination is enough (in daylight) the maximum sensitivity is in the green region at 555 nm.
[22] The speed of light in air is –
A.
3 x 10⁸ m/s
B.
3 x 10⁻⁸ cm/s
C.
8 x 10³ m/s
D.
Infinity
Ans:
3 x 10⁸ m/s
Explanation :
Speed of light (in Media) = Speed of Light (in Vacuum) / Refreactive Index of Material. Speed of light in air as taken generally is 3 X 10 power 8 meter per second.
[23] The speed of light with the rise in the temperature of the medium :
A.
Increases
B.
Decreases
C.
Remains unaltered
D.
Drops suddenly
Ans:
Remains unaltered
Explanation :
The speed of light with the rise in the temperature of the medium remains unaltered because speed of light doesn't depend on temperature. It does depend, however, on the refractive index of the substance it is travelling through. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.
[24] A rocket works on the principle of conservation of .
A.
mass
B.
linear momentum
C.
energy
D.
angular momentum
Ans:
linear momentum
Explanation :
A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
[25] The swing of a spinning cricket ball in air can be explained on the basis of –
A.
Sudden change in wind direction.
B.
Buoyancy of air.
C.
Turbulence caused by wind.
D.
Bernoulli's theorem.
Ans:
Turbulence caused by wind.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.
Explanation :
The period of oscillation of 3 cm microwaves is 1 x 10-10 (Physics, Volume 1, by Halliday). The period of oscillation is the smallest interval of time in which a system undergoing oscillation returns to the state it was in at the beginning of the oscillation.
[16] When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?
A.
Hydrogen bond formation
B.
Vander waals forces
C.
Covalent attraction
D.
Dipole interaction
Ans:
Hydrogen bond formation
Explanation :
When two ice cubes are pressed together, they join to form one cube due to hydrogen bond.
[17] For which Diode is used?
A.
modulation
B.
oscillation
C.
amplification
D.
purificationin
Ans:
purificationin
Explanation :
The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking current in the opposite direction (the reverse direction). This unidirectional behavior is called rectification or verification and is used to convert alternating current to direct current, including extraction of modulation from radio signals in radio receivers—these diodes are forms of rectifiers diode is a two-terminal electronic component with an asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction, and high (ideally infinite) resistance in the other.
[18] The force which opposes the relative motion between different layers of liquid or gases is called -
A.
Critical Velocity
B.
Streamline Flow
C.
Terminal Velocity
D.
Viscous Force
Ans:
Viscous Force
Explanation :
Critical Velocity – The maximum velocity upto which fluid motion is streamline is called Critical Velocity. Streamline Flow – If velocity of all fluid particles is same all the time then it can be said in streamline flow.
[19] Water has maximum density at .
A.
0 C
B.
-15 C
C.
4 C
D.
15 C
Ans:
4 C
Explanation :
Water has maximum density at 4 degrees C turns out to be the temperature at which liquid water has the highest density. If you heat it or cool it, it will expand.
[20] Who among the following developed the technology of underground nuclear explosion?
A.
Dr. Homi J. Bhabha
B.
Dr. Vikram Sarabhai
C.
Dr. Raja Ramanna
D.
Dr. P. K. Iyengar
Ans:
Dr. Homi J. Bhabha
Explanation :
Homi Jehangir Bhabha was an Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research. Colloquially known as “father of Indian nuclear programme,” Bhabha gained international prominence after deriving a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering. His major contribution included his work on Compton scattering, R process, and furthermore the advancement of nuclear physics. He was awarded Padma Bhushan by Government of India in 1954.
[21] Sensitivity of the human eye is maximum in the –
A.
Violet region
B.
Green region
C.
Blue region
D.
Red region
Ans:
Green region
Explanation :
The human eye is sensible to light wave which wavelength is roughly between 400 nm and 700 nm. When illumination is enough (in daylight) the maximum sensitivity is in the green region at 555 nm.
[22] The speed of light in air is –
A.
3 x 10⁸ m/s
B.
3 x 10⁻⁸ cm/s
C.
8 x 10³ m/s
D.
Infinity
Ans:
3 x 10⁸ m/s
Explanation :
Speed of light (in Media) = Speed of Light (in Vacuum) / Refreactive Index of Material. Speed of light in air as taken generally is 3 X 10 power 8 meter per second.
[23] The speed of light with the rise in the temperature of the medium :
A.
Increases
B.
Decreases
C.
Remains unaltered
D.
Drops suddenly
Ans:
Remains unaltered
Explanation :
The speed of light with the rise in the temperature of the medium remains unaltered because speed of light doesn't depend on temperature. It does depend, however, on the refractive index of the substance it is travelling through. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.
[24] A rocket works on the principle of conservation of .
A.
mass
B.
linear momentum
C.
energy
D.
angular momentum
Ans:
linear momentum
Explanation :
A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
[25] The swing of a spinning cricket ball in air can be explained on the basis of –
A.
Sudden change in wind direction.
B.
Buoyancy of air.
C.
Turbulence caused by wind.
D.
Bernoulli's theorem.
Ans:
Turbulence caused by wind.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.
Explanation :
The most common function of a diode is to allow an electric current to pass in one direction (called the diode's forward direction), while blocking current in the opposite direction (the reverse direction). This unidirectional behavior is called rectification or verification and is used to convert alternating current to direct current, including extraction of modulation from radio signals in radio receivers—these diodes are forms of rectifiers diode is a two-terminal electronic component with an asymmetric transfer characteristic, with low (ideally zero) resistance to current flow in one direction, and high (ideally infinite) resistance in the other.
[18] The force which opposes the relative motion between different layers of liquid or gases is called -
A.
Critical Velocity
B.
Streamline Flow
C.
Terminal Velocity
D.
Viscous Force
Ans:
Viscous Force
Explanation :
Critical Velocity – The maximum velocity upto which fluid motion is streamline is called Critical Velocity. Streamline Flow – If velocity of all fluid particles is same all the time then it can be said in streamline flow.
[19] Water has maximum density at .
A.
0 C
B.
-15 C
C.
4 C
D.
15 C
Ans:
4 C
Explanation :
Water has maximum density at 4 degrees C turns out to be the temperature at which liquid water has the highest density. If you heat it or cool it, it will expand.
[20] Who among the following developed the technology of underground nuclear explosion?
A.
Dr. Homi J. Bhabha
B.
Dr. Vikram Sarabhai
C.
Dr. Raja Ramanna
D.
Dr. P. K. Iyengar
Ans:
Dr. Homi J. Bhabha
Explanation :
Homi Jehangir Bhabha was an Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research. Colloquially known as “father of Indian nuclear programme,” Bhabha gained international prominence after deriving a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering. His major contribution included his work on Compton scattering, R process, and furthermore the advancement of nuclear physics. He was awarded Padma Bhushan by Government of India in 1954.
[21] Sensitivity of the human eye is maximum in the –
A.
Violet region
B.
Green region
C.
Blue region
D.
Red region
Ans:
Green region
Explanation :
The human eye is sensible to light wave which wavelength is roughly between 400 nm and 700 nm. When illumination is enough (in daylight) the maximum sensitivity is in the green region at 555 nm.
[22] The speed of light in air is –
A.
3 x 10⁸ m/s
B.
3 x 10⁻⁸ cm/s
C.
8 x 10³ m/s
D.
Infinity
Ans:
3 x 10⁸ m/s
Explanation :
Speed of light (in Media) = Speed of Light (in Vacuum) / Refreactive Index of Material. Speed of light in air as taken generally is 3 X 10 power 8 meter per second.
[23] The speed of light with the rise in the temperature of the medium :
A.
Increases
B.
Decreases
C.
Remains unaltered
D.
Drops suddenly
Ans:
Remains unaltered
Explanation :
The speed of light with the rise in the temperature of the medium remains unaltered because speed of light doesn't depend on temperature. It does depend, however, on the refractive index of the substance it is travelling through. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.
[24] A rocket works on the principle of conservation of .
A.
mass
B.
linear momentum
C.
energy
D.
angular momentum
Ans:
linear momentum
Explanation :
A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
[25] The swing of a spinning cricket ball in air can be explained on the basis of –
A.
Sudden change in wind direction.
B.
Buoyancy of air.
C.
Turbulence caused by wind.
D.
Bernoulli's theorem.
Ans:
Turbulence caused by wind.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.
Explanation :
Water has maximum density at 4 degrees C turns out to be the temperature at which liquid water has the highest density. If you heat it or cool it, it will expand.
[20] Who among the following developed the technology of underground nuclear explosion?
A.
Dr. Homi J. Bhabha
B.
Dr. Vikram Sarabhai
C.
Dr. Raja Ramanna
D.
Dr. P. K. Iyengar
Ans:
Dr. Homi J. Bhabha
Explanation :
Homi Jehangir Bhabha was an Indian nuclear physicist, founding director, and professor of physics at the Tata Institute of Fundamental Research. Colloquially known as “father of Indian nuclear programme,” Bhabha gained international prominence after deriving a correct expression for the probability of scattering positrons by electrons, a process now known as Bhabha scattering. His major contribution included his work on Compton scattering, R process, and furthermore the advancement of nuclear physics. He was awarded Padma Bhushan by Government of India in 1954.
[21] Sensitivity of the human eye is maximum in the –
A.
Violet region
B.
Green region
C.
Blue region
D.
Red region
Ans:
Green region
Explanation :
The human eye is sensible to light wave which wavelength is roughly between 400 nm and 700 nm. When illumination is enough (in daylight) the maximum sensitivity is in the green region at 555 nm.
[22] The speed of light in air is –
A.
3 x 10⁸ m/s
B.
3 x 10⁻⁸ cm/s
C.
8 x 10³ m/s
D.
Infinity
Ans:
3 x 10⁸ m/s
Explanation :
Speed of light (in Media) = Speed of Light (in Vacuum) / Refreactive Index of Material. Speed of light in air as taken generally is 3 X 10 power 8 meter per second.
[23] The speed of light with the rise in the temperature of the medium :
A.
Increases
B.
Decreases
C.
Remains unaltered
D.
Drops suddenly
Ans:
Remains unaltered
Explanation :
The speed of light with the rise in the temperature of the medium remains unaltered because speed of light doesn't depend on temperature. It does depend, however, on the refractive index of the substance it is travelling through. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.
[24] A rocket works on the principle of conservation of .
A.
mass
B.
linear momentum
C.
energy
D.
angular momentum
Ans:
linear momentum
Explanation :
A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
[25] The swing of a spinning cricket ball in air can be explained on the basis of –
A.
Sudden change in wind direction.
B.
Buoyancy of air.
C.
Turbulence caused by wind.
D.
Bernoulli's theorem.
Ans:
Turbulence caused by wind.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.
Explanation :
The human eye is sensible to light wave which wavelength is roughly between 400 nm and 700 nm. When illumination is enough (in daylight) the maximum sensitivity is in the green region at 555 nm.
[22] The speed of light in air is –
A.
3 x 10⁸ m/s
B.
3 x 10⁻⁸ cm/s
C.
8 x 10³ m/s
D.
Infinity
Ans:
3 x 10⁸ m/s
Explanation :
Speed of light (in Media) = Speed of Light (in Vacuum) / Refreactive Index of Material. Speed of light in air as taken generally is 3 X 10 power 8 meter per second.
[23] The speed of light with the rise in the temperature of the medium :
A.
Increases
B.
Decreases
C.
Remains unaltered
D.
Drops suddenly
Ans:
Remains unaltered
Explanation :
The speed of light with the rise in the temperature of the medium remains unaltered because speed of light doesn't depend on temperature. It does depend, however, on the refractive index of the substance it is travelling through. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.
[24] A rocket works on the principle of conservation of .
A.
mass
B.
linear momentum
C.
energy
D.
angular momentum
Ans:
linear momentum
Explanation :
A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
[25] The swing of a spinning cricket ball in air can be explained on the basis of –
A.
Sudden change in wind direction.
B.
Buoyancy of air.
C.
Turbulence caused by wind.
D.
Bernoulli's theorem.
Ans:
Turbulence caused by wind.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.
Explanation :
The speed of light with the rise in the temperature of the medium remains unaltered because speed of light doesn't depend on temperature. It does depend, however, on the refractive index of the substance it is travelling through. The speed of light in vacuum, commonly denoted c, is a universal physical constant important in many areas of physics.
[24] A rocket works on the principle of conservation of .
A.
mass
B.
linear momentum
C.
energy
D.
angular momentum
Ans:
linear momentum
Explanation :
A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum.
[25] The swing of a spinning cricket ball in air can be explained on the basis of –
A.
Sudden change in wind direction.
B.
Buoyancy of air.
C.
Turbulence caused by wind.
D.
Bernoulli's theorem.
Ans:
Turbulence caused by wind.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.
Explanation :
The main theory of swing bowling surrounded turbulent and laminar airflow. Laminar air separates from the surface of the ball earlier than turbulent flow air, so that the separation point moves toward the front of the ball on the laminar side. On the turbulent flow side it remains towards the back; inducing a greater lift force on the turbulent airflow side of the ball.