[1] The fuse in an electric circuit is connected in –
A.
series with neutral
B.
parallel to live
C.
parallel to neutral
D.
series with live
Ans:
series with live
Explanation :
A fuse wire is a safety wire connected in series with the live wire that has high resistivity and low melting point. Fuses are always connected in series with the component(s) to be protected from over current. In case of any large current supply or malfunctioning in the electric connections, it melts and breaks the electric circuit.
[2] A particle is thrown vertically upward. When it reaches the highest point, it has –
A.
a downward acceleration
B.
an upward acceleration
C.
a downward velocity
D.
a horizontal velocity
Ans:
a downward acceleration
Explanation :
When a particle is thrown vertically upwards in space, it will experience constant acceleration towards the ground (irrespective of the direction in which it is moving in), known as acceleration due to gravity. At the highest point, it has zero velocity but has downward acceleration equal to acceleration due to gravity.
[3] Which one of the following is an ohmic conductor?
A.
Germanium
B.
Silicon
C.
Carbon
D.
Silver
Ans:
Silver
Explanation :
Ohmic conductors are conductors that obey Ohm's law, that is Voltage/Current ratio is constant; in other words, the equation Resistance = Voltage/Current is obeyed. An Ohmic conductor's resistance does not change with varying current. Metallic conductors such as silver are Ohmic conductors.
[4] The spring balance works on the principle of -
A.
Boyle's Law
B.
Hooke's Law
C.
Bernoulli's principle
D.
Pascal's Law
Ans:
Hooke's Law
Explanation :
A spring scale or spring balance or Newton meter is a type of weighing scale. It consists of spring fixed at one end with a hook to attach an object at the other. It works by Hooke's Law, which states that the force needed to extend a spring is proportional to the distance that spring is extended from its rest position.
[5] Fill in the blank with the most appropriate option. The Universal Constant of Gravitation is _.
A.
6.67 x 10¹⁰ Nm²/kg
B.
6.76 x 10⁻¹⁰ Nm²/kg²
C.
6.67 x 10⁻¹¹ Nm²/kg²
D.
9.8 Nm²/kg²
Ans:
6.67 x 10⁻¹¹ Nm²/kg²
Explanation :
The gravitational constant (also known as the universal gravitational constant), is an empirical physical constant involved in the calculation of gravitational effects in Sir Isaac Newton's law of universal gravitation and in Albert Einstein's general theory of relativity.
[6] A moving car possesses -
A.
sound energy
B.
mechanical energy
C.
heat energy
D.
chemical energy
Ans:
mechanical energy
Explanation :
A moving baseball possesses mechanical energy due to both its high speed (kinetic energy) and its vertical position above the ground (gravitational potential energy).
[7] Which Article of the Indian Constitution provides free and compulsory education to children?
A.
21-A
B.
46
C.
39
D.
15
Ans:
21-A
Explanation :
According to Article 21A of Indian Constitution, the State shall provide free and compulsory education to all children of the age of six to fourteen years in such manner as the State may, by law, determine. This article was inserted in the constitution by 86th Amendment Act, 2002, also known as Right of Children to Free and Compulsory Education Act.
[8] The cooling by a desert Cooler is based on:
A.
Hot air replacement
B.
Air dehydration
C.
Evaporative Cooling
D.
Air Rehydration
Ans:
Evaporative Cooling
Explanation :
Nature's most efficient means of cooling is through the evaporation of water. Desert coolers make use of evaporative cooling that works on the principle of heat absorption by moisture evaporation. As water is evaporated, energy is lost from the air, reducing the temperature. Thus, cooling effect is produced.
[9] Distant objects are visible as a little out of focus in this condition –
A.
presbiopia
B.
hypermetropia
C.
astigmatism
D.
myopia
Ans:
myopia
Explanation :
Myopia, also known as near-sightedness and short-sightedness, is a condition of the eye where the light that comes in does not directly focus on the retina but in front of it, causing the image that one sees when looking at a distant object to be out of focus, but in focus when looking at a close object.
[10] That an Iron ship floats in water but an Iron ball sinks, is an example of -
A.
Newton's second law
B.
Pascal's law
C.
Archimedes Principle
D.
Dalton's law
Ans:
Archimedes Principle
Explanation :
The floating of an iron ship in water is an example of Archimedes principle. Archimedes' principle states that an object floats on water if the weight of the water displaced by it is equal to its weight. Since the average density of the ship as a whole is less than the density of water.
[11] A temperature rise in environment that disturbs life is called -
A.
water pollution
B.
nuclear pollution
C.
thermal pollution
D.
traffic pollution
Ans:
thermal pollution
Explanation :
Thermal pollution, the artificial warming of a body of water because of industrial waste or runoff from streets and parking lots, is becoming a common threat to the environment.
[12] What is the approximate height of a geostationary satellite from the surface of the earth?
A.
981 km
B.
15000 km
C.
35000 km
D.
55000 km
Ans:
35000 km
Explanation :
A satellite in such an orbit is at an altitude of approximately 35,786 km (22,236 mi) above mean sea level.
[13] What is the SI unit of frequency?
A.
Newton
B.
Watt
C.
Farad
D.
Hertz
Ans:
Hertz
Explanation :
The number of waves or vibrations passing through a point in one second is called Frequency. The SI (System International) Unit of Frequency is Hertz(Hz).
[14] The metallurgical process in which a metal is obtained in a fused state is called -
A.
roasting
B.
calcinations
C.
smelting
D.
froth floatation
Ans:
smelting
Explanation :
The metallurgical process in which a metal is obtained in a fused state is called smelting.
[15] Which one of the following elements shows variable equivalent mass?
A.
Zinc
B.
Silver
C.
Calcium
D.
Iron
Ans:
Iron
Explanation :
0
[16] Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth-
A.
remains same
B.
becomes half
C.
becomes twice
D.
becomes one-fourth
Ans:
becomes one-fourth
Explanation :
The gravitational force is proportional to 1/R2, where R is the distance from the centre of the Earth. So at a height of 2R from the centre of the earth, the corresponding weight would be one-fourth of the original weight.
[17] The dimensional formula for universal gravitational constant is –
A.
M⁻¹L³T²
B.
ML²T⁻²
C.
M⁻²
D.
M⁻¹L³T⁻²
Ans:
M⁻¹L³T⁻²
Explanation :
Universal Constant of Gravitation is represented by G and is derived from Newton's law of gravitation.
[18] Alpha particle is the nucleus of an atom of –
A.
Lithium
B.
Hydrogen
C.
Helium
D.
Oxygen
Ans:
Helium
Explanation :
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus, which is generally produced in the process of alpha decay.
[19] Which of the following supports particle nature of photons?
A.
Diffraction
B.
Polarization
C.
Photoelectric effect
D.
Interference
Ans:
Photoelectric effect
Explanation :
Light is made up of photons, so it has some particle properties. In the photoelectric effect, light hits some material which absorbs it, and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.
[20] 'Farad' is the unit of :
A.
Capacitance
B.
Inductance
C.
Resistance
D.
Conductance
Ans:
Capacitance
Explanation :
The Farad is the SI derived unit of capacitance. It is named after the English physicist Michael Faraday.
[21] Man perceives sound vibrations in the frequency ranges of –
A.
0 – 5 Hz
B.
6 - 10 Hz
C.
11 - 15 Hz
D.
20 - 20000 Hz
Ans:
20 - 20000 Hz
Explanation :
The frequencies at which a human being can perceive sound vary between 20 Hertz and 20,000 Hertz. It is within these frequency ranges that people can communicate to each other and listen to music.
[22] The quantum theory of light was given by -
A.
Einstein
B.
Plank
C.
Newton
D.
Faraday
Ans:
Plank
Explanation :
The Quantum theory of light was first discovered by Max Planck. In 1900, Planck, attempting to explain body radiation suggested that although light was a wave.
[23] The earth is a –
A.
good reflector of heat
B.
non-absorber of heat
C.
good absorber and good radiator of heat
D.
bad absorber and bad radiator of heat
Ans:
good absorber and good radiator of heat
Explanation :
The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
[24] Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
A.
Doppler’s Effect
B.
Newton’s law of cooling
C.
Kirchhoff’s Law
D.
Stefan’s Law
Ans:
Newton’s law of cooling
Explanation :
Kirchhoff’s Law – Kirchhoff’s Law signifies that good absorbers are good emitters. Stefan’s Law – The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
[25] Why does water tank appear shallower when viewed from the top?
A.
Due to reflection
B.
Due to refraction
C.
Due to diffraction
D.
Due to total internal reflection
Ans:
Due to refraction
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
Explanation :
A fuse wire is a safety wire connected in series with the live wire that has high resistivity and low melting point. Fuses are always connected in series with the component(s) to be protected from over current. In case of any large current supply or malfunctioning in the electric connections, it melts and breaks the electric circuit.
[2] A particle is thrown vertically upward. When it reaches the highest point, it has –
A.
a downward acceleration
B.
an upward acceleration
C.
a downward velocity
D.
a horizontal velocity
Ans:
a downward acceleration
Explanation :
When a particle is thrown vertically upwards in space, it will experience constant acceleration towards the ground (irrespective of the direction in which it is moving in), known as acceleration due to gravity. At the highest point, it has zero velocity but has downward acceleration equal to acceleration due to gravity.
[3] Which one of the following is an ohmic conductor?
A.
Germanium
B.
Silicon
C.
Carbon
D.
Silver
Ans:
Silver
Explanation :
Ohmic conductors are conductors that obey Ohm's law, that is Voltage/Current ratio is constant; in other words, the equation Resistance = Voltage/Current is obeyed. An Ohmic conductor's resistance does not change with varying current. Metallic conductors such as silver are Ohmic conductors.
[4] The spring balance works on the principle of -
A.
Boyle's Law
B.
Hooke's Law
C.
Bernoulli's principle
D.
Pascal's Law
Ans:
Hooke's Law
Explanation :
A spring scale or spring balance or Newton meter is a type of weighing scale. It consists of spring fixed at one end with a hook to attach an object at the other. It works by Hooke's Law, which states that the force needed to extend a spring is proportional to the distance that spring is extended from its rest position.
[5] Fill in the blank with the most appropriate option. The Universal Constant of Gravitation is _.
A.
6.67 x 10¹⁰ Nm²/kg
B.
6.76 x 10⁻¹⁰ Nm²/kg²
C.
6.67 x 10⁻¹¹ Nm²/kg²
D.
9.8 Nm²/kg²
Ans:
6.67 x 10⁻¹¹ Nm²/kg²
Explanation :
The gravitational constant (also known as the universal gravitational constant), is an empirical physical constant involved in the calculation of gravitational effects in Sir Isaac Newton's law of universal gravitation and in Albert Einstein's general theory of relativity.
[6] A moving car possesses -
A.
sound energy
B.
mechanical energy
C.
heat energy
D.
chemical energy
Ans:
mechanical energy
Explanation :
A moving baseball possesses mechanical energy due to both its high speed (kinetic energy) and its vertical position above the ground (gravitational potential energy).
[7] Which Article of the Indian Constitution provides free and compulsory education to children?
A.
21-A
B.
46
C.
39
D.
15
Ans:
21-A
Explanation :
According to Article 21A of Indian Constitution, the State shall provide free and compulsory education to all children of the age of six to fourteen years in such manner as the State may, by law, determine. This article was inserted in the constitution by 86th Amendment Act, 2002, also known as Right of Children to Free and Compulsory Education Act.
[8] The cooling by a desert Cooler is based on:
A.
Hot air replacement
B.
Air dehydration
C.
Evaporative Cooling
D.
Air Rehydration
Ans:
Evaporative Cooling
Explanation :
Nature's most efficient means of cooling is through the evaporation of water. Desert coolers make use of evaporative cooling that works on the principle of heat absorption by moisture evaporation. As water is evaporated, energy is lost from the air, reducing the temperature. Thus, cooling effect is produced.
[9] Distant objects are visible as a little out of focus in this condition –
A.
presbiopia
B.
hypermetropia
C.
astigmatism
D.
myopia
Ans:
myopia
Explanation :
Myopia, also known as near-sightedness and short-sightedness, is a condition of the eye where the light that comes in does not directly focus on the retina but in front of it, causing the image that one sees when looking at a distant object to be out of focus, but in focus when looking at a close object.
[10] That an Iron ship floats in water but an Iron ball sinks, is an example of -
A.
Newton's second law
B.
Pascal's law
C.
Archimedes Principle
D.
Dalton's law
Ans:
Archimedes Principle
Explanation :
The floating of an iron ship in water is an example of Archimedes principle. Archimedes' principle states that an object floats on water if the weight of the water displaced by it is equal to its weight. Since the average density of the ship as a whole is less than the density of water.
[11] A temperature rise in environment that disturbs life is called -
A.
water pollution
B.
nuclear pollution
C.
thermal pollution
D.
traffic pollution
Ans:
thermal pollution
Explanation :
Thermal pollution, the artificial warming of a body of water because of industrial waste or runoff from streets and parking lots, is becoming a common threat to the environment.
[12] What is the approximate height of a geostationary satellite from the surface of the earth?
A.
981 km
B.
15000 km
C.
35000 km
D.
55000 km
Ans:
35000 km
Explanation :
A satellite in such an orbit is at an altitude of approximately 35,786 km (22,236 mi) above mean sea level.
[13] What is the SI unit of frequency?
A.
Newton
B.
Watt
C.
Farad
D.
Hertz
Ans:
Hertz
Explanation :
The number of waves or vibrations passing through a point in one second is called Frequency. The SI (System International) Unit of Frequency is Hertz(Hz).
[14] The metallurgical process in which a metal is obtained in a fused state is called -
A.
roasting
B.
calcinations
C.
smelting
D.
froth floatation
Ans:
smelting
Explanation :
The metallurgical process in which a metal is obtained in a fused state is called smelting.
[15] Which one of the following elements shows variable equivalent mass?
A.
Zinc
B.
Silver
C.
Calcium
D.
Iron
Ans:
Iron
Explanation :
0
[16] Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth-
A.
remains same
B.
becomes half
C.
becomes twice
D.
becomes one-fourth
Ans:
becomes one-fourth
Explanation :
The gravitational force is proportional to 1/R2, where R is the distance from the centre of the Earth. So at a height of 2R from the centre of the earth, the corresponding weight would be one-fourth of the original weight.
[17] The dimensional formula for universal gravitational constant is –
A.
M⁻¹L³T²
B.
ML²T⁻²
C.
M⁻²
D.
M⁻¹L³T⁻²
Ans:
M⁻¹L³T⁻²
Explanation :
Universal Constant of Gravitation is represented by G and is derived from Newton's law of gravitation.
[18] Alpha particle is the nucleus of an atom of –
A.
Lithium
B.
Hydrogen
C.
Helium
D.
Oxygen
Ans:
Helium
Explanation :
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus, which is generally produced in the process of alpha decay.
[19] Which of the following supports particle nature of photons?
A.
Diffraction
B.
Polarization
C.
Photoelectric effect
D.
Interference
Ans:
Photoelectric effect
Explanation :
Light is made up of photons, so it has some particle properties. In the photoelectric effect, light hits some material which absorbs it, and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.
[20] 'Farad' is the unit of :
A.
Capacitance
B.
Inductance
C.
Resistance
D.
Conductance
Ans:
Capacitance
Explanation :
The Farad is the SI derived unit of capacitance. It is named after the English physicist Michael Faraday.
[21] Man perceives sound vibrations in the frequency ranges of –
A.
0 – 5 Hz
B.
6 - 10 Hz
C.
11 - 15 Hz
D.
20 - 20000 Hz
Ans:
20 - 20000 Hz
Explanation :
The frequencies at which a human being can perceive sound vary between 20 Hertz and 20,000 Hertz. It is within these frequency ranges that people can communicate to each other and listen to music.
[22] The quantum theory of light was given by -
A.
Einstein
B.
Plank
C.
Newton
D.
Faraday
Ans:
Plank
Explanation :
The Quantum theory of light was first discovered by Max Planck. In 1900, Planck, attempting to explain body radiation suggested that although light was a wave.
[23] The earth is a –
A.
good reflector of heat
B.
non-absorber of heat
C.
good absorber and good radiator of heat
D.
bad absorber and bad radiator of heat
Ans:
good absorber and good radiator of heat
Explanation :
The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
[24] Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
A.
Doppler’s Effect
B.
Newton’s law of cooling
C.
Kirchhoff’s Law
D.
Stefan’s Law
Ans:
Newton’s law of cooling
Explanation :
Kirchhoff’s Law – Kirchhoff’s Law signifies that good absorbers are good emitters. Stefan’s Law – The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
[25] Why does water tank appear shallower when viewed from the top?
A.
Due to reflection
B.
Due to refraction
C.
Due to diffraction
D.
Due to total internal reflection
Ans:
Due to refraction
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
Explanation :
Ohmic conductors are conductors that obey Ohm's law, that is Voltage/Current ratio is constant; in other words, the equation Resistance = Voltage/Current is obeyed. An Ohmic conductor's resistance does not change with varying current. Metallic conductors such as silver are Ohmic conductors.
[4] The spring balance works on the principle of -
A.
Boyle's Law
B.
Hooke's Law
C.
Bernoulli's principle
D.
Pascal's Law
Ans:
Hooke's Law
Explanation :
A spring scale or spring balance or Newton meter is a type of weighing scale. It consists of spring fixed at one end with a hook to attach an object at the other. It works by Hooke's Law, which states that the force needed to extend a spring is proportional to the distance that spring is extended from its rest position.
[5] Fill in the blank with the most appropriate option. The Universal Constant of Gravitation is _.
A.
6.67 x 10¹⁰ Nm²/kg
B.
6.76 x 10⁻¹⁰ Nm²/kg²
C.
6.67 x 10⁻¹¹ Nm²/kg²
D.
9.8 Nm²/kg²
Ans:
6.67 x 10⁻¹¹ Nm²/kg²
Explanation :
The gravitational constant (also known as the universal gravitational constant), is an empirical physical constant involved in the calculation of gravitational effects in Sir Isaac Newton's law of universal gravitation and in Albert Einstein's general theory of relativity.
[6] A moving car possesses -
A.
sound energy
B.
mechanical energy
C.
heat energy
D.
chemical energy
Ans:
mechanical energy
Explanation :
A moving baseball possesses mechanical energy due to both its high speed (kinetic energy) and its vertical position above the ground (gravitational potential energy).
[7] Which Article of the Indian Constitution provides free and compulsory education to children?
A.
21-A
B.
46
C.
39
D.
15
Ans:
21-A
Explanation :
According to Article 21A of Indian Constitution, the State shall provide free and compulsory education to all children of the age of six to fourteen years in such manner as the State may, by law, determine. This article was inserted in the constitution by 86th Amendment Act, 2002, also known as Right of Children to Free and Compulsory Education Act.
[8] The cooling by a desert Cooler is based on:
A.
Hot air replacement
B.
Air dehydration
C.
Evaporative Cooling
D.
Air Rehydration
Ans:
Evaporative Cooling
Explanation :
Nature's most efficient means of cooling is through the evaporation of water. Desert coolers make use of evaporative cooling that works on the principle of heat absorption by moisture evaporation. As water is evaporated, energy is lost from the air, reducing the temperature. Thus, cooling effect is produced.
[9] Distant objects are visible as a little out of focus in this condition –
A.
presbiopia
B.
hypermetropia
C.
astigmatism
D.
myopia
Ans:
myopia
Explanation :
Myopia, also known as near-sightedness and short-sightedness, is a condition of the eye where the light that comes in does not directly focus on the retina but in front of it, causing the image that one sees when looking at a distant object to be out of focus, but in focus when looking at a close object.
[10] That an Iron ship floats in water but an Iron ball sinks, is an example of -
A.
Newton's second law
B.
Pascal's law
C.
Archimedes Principle
D.
Dalton's law
Ans:
Archimedes Principle
Explanation :
The floating of an iron ship in water is an example of Archimedes principle. Archimedes' principle states that an object floats on water if the weight of the water displaced by it is equal to its weight. Since the average density of the ship as a whole is less than the density of water.
[11] A temperature rise in environment that disturbs life is called -
A.
water pollution
B.
nuclear pollution
C.
thermal pollution
D.
traffic pollution
Ans:
thermal pollution
Explanation :
Thermal pollution, the artificial warming of a body of water because of industrial waste or runoff from streets and parking lots, is becoming a common threat to the environment.
[12] What is the approximate height of a geostationary satellite from the surface of the earth?
A.
981 km
B.
15000 km
C.
35000 km
D.
55000 km
Ans:
35000 km
Explanation :
A satellite in such an orbit is at an altitude of approximately 35,786 km (22,236 mi) above mean sea level.
[13] What is the SI unit of frequency?
A.
Newton
B.
Watt
C.
Farad
D.
Hertz
Ans:
Hertz
Explanation :
The number of waves or vibrations passing through a point in one second is called Frequency. The SI (System International) Unit of Frequency is Hertz(Hz).
[14] The metallurgical process in which a metal is obtained in a fused state is called -
A.
roasting
B.
calcinations
C.
smelting
D.
froth floatation
Ans:
smelting
Explanation :
The metallurgical process in which a metal is obtained in a fused state is called smelting.
[15] Which one of the following elements shows variable equivalent mass?
A.
Zinc
B.
Silver
C.
Calcium
D.
Iron
Ans:
Iron
Explanation :
0
[16] Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth-
A.
remains same
B.
becomes half
C.
becomes twice
D.
becomes one-fourth
Ans:
becomes one-fourth
Explanation :
The gravitational force is proportional to 1/R2, where R is the distance from the centre of the Earth. So at a height of 2R from the centre of the earth, the corresponding weight would be one-fourth of the original weight.
[17] The dimensional formula for universal gravitational constant is –
A.
M⁻¹L³T²
B.
ML²T⁻²
C.
M⁻²
D.
M⁻¹L³T⁻²
Ans:
M⁻¹L³T⁻²
Explanation :
Universal Constant of Gravitation is represented by G and is derived from Newton's law of gravitation.
[18] Alpha particle is the nucleus of an atom of –
A.
Lithium
B.
Hydrogen
C.
Helium
D.
Oxygen
Ans:
Helium
Explanation :
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus, which is generally produced in the process of alpha decay.
[19] Which of the following supports particle nature of photons?
A.
Diffraction
B.
Polarization
C.
Photoelectric effect
D.
Interference
Ans:
Photoelectric effect
Explanation :
Light is made up of photons, so it has some particle properties. In the photoelectric effect, light hits some material which absorbs it, and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.
[20] 'Farad' is the unit of :
A.
Capacitance
B.
Inductance
C.
Resistance
D.
Conductance
Ans:
Capacitance
Explanation :
The Farad is the SI derived unit of capacitance. It is named after the English physicist Michael Faraday.
[21] Man perceives sound vibrations in the frequency ranges of –
A.
0 – 5 Hz
B.
6 - 10 Hz
C.
11 - 15 Hz
D.
20 - 20000 Hz
Ans:
20 - 20000 Hz
Explanation :
The frequencies at which a human being can perceive sound vary between 20 Hertz and 20,000 Hertz. It is within these frequency ranges that people can communicate to each other and listen to music.
[22] The quantum theory of light was given by -
A.
Einstein
B.
Plank
C.
Newton
D.
Faraday
Ans:
Plank
Explanation :
The Quantum theory of light was first discovered by Max Planck. In 1900, Planck, attempting to explain body radiation suggested that although light was a wave.
[23] The earth is a –
A.
good reflector of heat
B.
non-absorber of heat
C.
good absorber and good radiator of heat
D.
bad absorber and bad radiator of heat
Ans:
good absorber and good radiator of heat
Explanation :
The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
[24] Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
A.
Doppler’s Effect
B.
Newton’s law of cooling
C.
Kirchhoff’s Law
D.
Stefan’s Law
Ans:
Newton’s law of cooling
Explanation :
Kirchhoff’s Law – Kirchhoff’s Law signifies that good absorbers are good emitters. Stefan’s Law – The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
[25] Why does water tank appear shallower when viewed from the top?
A.
Due to reflection
B.
Due to refraction
C.
Due to diffraction
D.
Due to total internal reflection
Ans:
Due to refraction
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
Explanation :
The gravitational constant (also known as the universal gravitational constant), is an empirical physical constant involved in the calculation of gravitational effects in Sir Isaac Newton's law of universal gravitation and in Albert Einstein's general theory of relativity.
[6] A moving car possesses -
A.
sound energy
B.
mechanical energy
C.
heat energy
D.
chemical energy
Ans:
mechanical energy
Explanation :
A moving baseball possesses mechanical energy due to both its high speed (kinetic energy) and its vertical position above the ground (gravitational potential energy).
[7] Which Article of the Indian Constitution provides free and compulsory education to children?
A.
21-A
B.
46
C.
39
D.
15
Ans:
21-A
Explanation :
According to Article 21A of Indian Constitution, the State shall provide free and compulsory education to all children of the age of six to fourteen years in such manner as the State may, by law, determine. This article was inserted in the constitution by 86th Amendment Act, 2002, also known as Right of Children to Free and Compulsory Education Act.
[8] The cooling by a desert Cooler is based on:
A.
Hot air replacement
B.
Air dehydration
C.
Evaporative Cooling
D.
Air Rehydration
Ans:
Evaporative Cooling
Explanation :
Nature's most efficient means of cooling is through the evaporation of water. Desert coolers make use of evaporative cooling that works on the principle of heat absorption by moisture evaporation. As water is evaporated, energy is lost from the air, reducing the temperature. Thus, cooling effect is produced.
[9] Distant objects are visible as a little out of focus in this condition –
A.
presbiopia
B.
hypermetropia
C.
astigmatism
D.
myopia
Ans:
myopia
Explanation :
Myopia, also known as near-sightedness and short-sightedness, is a condition of the eye where the light that comes in does not directly focus on the retina but in front of it, causing the image that one sees when looking at a distant object to be out of focus, but in focus when looking at a close object.
[10] That an Iron ship floats in water but an Iron ball sinks, is an example of -
A.
Newton's second law
B.
Pascal's law
C.
Archimedes Principle
D.
Dalton's law
Ans:
Archimedes Principle
Explanation :
The floating of an iron ship in water is an example of Archimedes principle. Archimedes' principle states that an object floats on water if the weight of the water displaced by it is equal to its weight. Since the average density of the ship as a whole is less than the density of water.
[11] A temperature rise in environment that disturbs life is called -
A.
water pollution
B.
nuclear pollution
C.
thermal pollution
D.
traffic pollution
Ans:
thermal pollution
Explanation :
Thermal pollution, the artificial warming of a body of water because of industrial waste or runoff from streets and parking lots, is becoming a common threat to the environment.
[12] What is the approximate height of a geostationary satellite from the surface of the earth?
A.
981 km
B.
15000 km
C.
35000 km
D.
55000 km
Ans:
35000 km
Explanation :
A satellite in such an orbit is at an altitude of approximately 35,786 km (22,236 mi) above mean sea level.
[13] What is the SI unit of frequency?
A.
Newton
B.
Watt
C.
Farad
D.
Hertz
Ans:
Hertz
Explanation :
The number of waves or vibrations passing through a point in one second is called Frequency. The SI (System International) Unit of Frequency is Hertz(Hz).
[14] The metallurgical process in which a metal is obtained in a fused state is called -
A.
roasting
B.
calcinations
C.
smelting
D.
froth floatation
Ans:
smelting
Explanation :
The metallurgical process in which a metal is obtained in a fused state is called smelting.
[15] Which one of the following elements shows variable equivalent mass?
A.
Zinc
B.
Silver
C.
Calcium
D.
Iron
Ans:
Iron
Explanation :
0
[16] Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth-
A.
remains same
B.
becomes half
C.
becomes twice
D.
becomes one-fourth
Ans:
becomes one-fourth
Explanation :
The gravitational force is proportional to 1/R2, where R is the distance from the centre of the Earth. So at a height of 2R from the centre of the earth, the corresponding weight would be one-fourth of the original weight.
[17] The dimensional formula for universal gravitational constant is –
A.
M⁻¹L³T²
B.
ML²T⁻²
C.
M⁻²
D.
M⁻¹L³T⁻²
Ans:
M⁻¹L³T⁻²
Explanation :
Universal Constant of Gravitation is represented by G and is derived from Newton's law of gravitation.
[18] Alpha particle is the nucleus of an atom of –
A.
Lithium
B.
Hydrogen
C.
Helium
D.
Oxygen
Ans:
Helium
Explanation :
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus, which is generally produced in the process of alpha decay.
[19] Which of the following supports particle nature of photons?
A.
Diffraction
B.
Polarization
C.
Photoelectric effect
D.
Interference
Ans:
Photoelectric effect
Explanation :
Light is made up of photons, so it has some particle properties. In the photoelectric effect, light hits some material which absorbs it, and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.
[20] 'Farad' is the unit of :
A.
Capacitance
B.
Inductance
C.
Resistance
D.
Conductance
Ans:
Capacitance
Explanation :
The Farad is the SI derived unit of capacitance. It is named after the English physicist Michael Faraday.
[21] Man perceives sound vibrations in the frequency ranges of –
A.
0 – 5 Hz
B.
6 - 10 Hz
C.
11 - 15 Hz
D.
20 - 20000 Hz
Ans:
20 - 20000 Hz
Explanation :
The frequencies at which a human being can perceive sound vary between 20 Hertz and 20,000 Hertz. It is within these frequency ranges that people can communicate to each other and listen to music.
[22] The quantum theory of light was given by -
A.
Einstein
B.
Plank
C.
Newton
D.
Faraday
Ans:
Plank
Explanation :
The Quantum theory of light was first discovered by Max Planck. In 1900, Planck, attempting to explain body radiation suggested that although light was a wave.
[23] The earth is a –
A.
good reflector of heat
B.
non-absorber of heat
C.
good absorber and good radiator of heat
D.
bad absorber and bad radiator of heat
Ans:
good absorber and good radiator of heat
Explanation :
The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
[24] Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
A.
Doppler’s Effect
B.
Newton’s law of cooling
C.
Kirchhoff’s Law
D.
Stefan’s Law
Ans:
Newton’s law of cooling
Explanation :
Kirchhoff’s Law – Kirchhoff’s Law signifies that good absorbers are good emitters. Stefan’s Law – The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
[25] Why does water tank appear shallower when viewed from the top?
A.
Due to reflection
B.
Due to refraction
C.
Due to diffraction
D.
Due to total internal reflection
Ans:
Due to refraction
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
Explanation :
According to Article 21A of Indian Constitution, the State shall provide free and compulsory education to all children of the age of six to fourteen years in such manner as the State may, by law, determine. This article was inserted in the constitution by 86th Amendment Act, 2002, also known as Right of Children to Free and Compulsory Education Act.
[8] The cooling by a desert Cooler is based on:
A.
Hot air replacement
B.
Air dehydration
C.
Evaporative Cooling
D.
Air Rehydration
Ans:
Evaporative Cooling
Explanation :
Nature's most efficient means of cooling is through the evaporation of water. Desert coolers make use of evaporative cooling that works on the principle of heat absorption by moisture evaporation. As water is evaporated, energy is lost from the air, reducing the temperature. Thus, cooling effect is produced.
[9] Distant objects are visible as a little out of focus in this condition –
A.
presbiopia
B.
hypermetropia
C.
astigmatism
D.
myopia
Ans:
myopia
Explanation :
Myopia, also known as near-sightedness and short-sightedness, is a condition of the eye where the light that comes in does not directly focus on the retina but in front of it, causing the image that one sees when looking at a distant object to be out of focus, but in focus when looking at a close object.
[10] That an Iron ship floats in water but an Iron ball sinks, is an example of -
A.
Newton's second law
B.
Pascal's law
C.
Archimedes Principle
D.
Dalton's law
Ans:
Archimedes Principle
Explanation :
The floating of an iron ship in water is an example of Archimedes principle. Archimedes' principle states that an object floats on water if the weight of the water displaced by it is equal to its weight. Since the average density of the ship as a whole is less than the density of water.
[11] A temperature rise in environment that disturbs life is called -
A.
water pollution
B.
nuclear pollution
C.
thermal pollution
D.
traffic pollution
Ans:
thermal pollution
Explanation :
Thermal pollution, the artificial warming of a body of water because of industrial waste or runoff from streets and parking lots, is becoming a common threat to the environment.
[12] What is the approximate height of a geostationary satellite from the surface of the earth?
A.
981 km
B.
15000 km
C.
35000 km
D.
55000 km
Ans:
35000 km
Explanation :
A satellite in such an orbit is at an altitude of approximately 35,786 km (22,236 mi) above mean sea level.
[13] What is the SI unit of frequency?
A.
Newton
B.
Watt
C.
Farad
D.
Hertz
Ans:
Hertz
Explanation :
The number of waves or vibrations passing through a point in one second is called Frequency. The SI (System International) Unit of Frequency is Hertz(Hz).
[14] The metallurgical process in which a metal is obtained in a fused state is called -
A.
roasting
B.
calcinations
C.
smelting
D.
froth floatation
Ans:
smelting
Explanation :
The metallurgical process in which a metal is obtained in a fused state is called smelting.
[15] Which one of the following elements shows variable equivalent mass?
A.
Zinc
B.
Silver
C.
Calcium
D.
Iron
Ans:
Iron
Explanation :
0
[16] Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth-
A.
remains same
B.
becomes half
C.
becomes twice
D.
becomes one-fourth
Ans:
becomes one-fourth
Explanation :
The gravitational force is proportional to 1/R2, where R is the distance from the centre of the Earth. So at a height of 2R from the centre of the earth, the corresponding weight would be one-fourth of the original weight.
[17] The dimensional formula for universal gravitational constant is –
A.
M⁻¹L³T²
B.
ML²T⁻²
C.
M⁻²
D.
M⁻¹L³T⁻²
Ans:
M⁻¹L³T⁻²
Explanation :
Universal Constant of Gravitation is represented by G and is derived from Newton's law of gravitation.
[18] Alpha particle is the nucleus of an atom of –
A.
Lithium
B.
Hydrogen
C.
Helium
D.
Oxygen
Ans:
Helium
Explanation :
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus, which is generally produced in the process of alpha decay.
[19] Which of the following supports particle nature of photons?
A.
Diffraction
B.
Polarization
C.
Photoelectric effect
D.
Interference
Ans:
Photoelectric effect
Explanation :
Light is made up of photons, so it has some particle properties. In the photoelectric effect, light hits some material which absorbs it, and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.
[20] 'Farad' is the unit of :
A.
Capacitance
B.
Inductance
C.
Resistance
D.
Conductance
Ans:
Capacitance
Explanation :
The Farad is the SI derived unit of capacitance. It is named after the English physicist Michael Faraday.
[21] Man perceives sound vibrations in the frequency ranges of –
A.
0 – 5 Hz
B.
6 - 10 Hz
C.
11 - 15 Hz
D.
20 - 20000 Hz
Ans:
20 - 20000 Hz
Explanation :
The frequencies at which a human being can perceive sound vary between 20 Hertz and 20,000 Hertz. It is within these frequency ranges that people can communicate to each other and listen to music.
[22] The quantum theory of light was given by -
A.
Einstein
B.
Plank
C.
Newton
D.
Faraday
Ans:
Plank
Explanation :
The Quantum theory of light was first discovered by Max Planck. In 1900, Planck, attempting to explain body radiation suggested that although light was a wave.
[23] The earth is a –
A.
good reflector of heat
B.
non-absorber of heat
C.
good absorber and good radiator of heat
D.
bad absorber and bad radiator of heat
Ans:
good absorber and good radiator of heat
Explanation :
The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
[24] Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
A.
Doppler’s Effect
B.
Newton’s law of cooling
C.
Kirchhoff’s Law
D.
Stefan’s Law
Ans:
Newton’s law of cooling
Explanation :
Kirchhoff’s Law – Kirchhoff’s Law signifies that good absorbers are good emitters. Stefan’s Law – The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
[25] Why does water tank appear shallower when viewed from the top?
A.
Due to reflection
B.
Due to refraction
C.
Due to diffraction
D.
Due to total internal reflection
Ans:
Due to refraction
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
Explanation :
Myopia, also known as near-sightedness and short-sightedness, is a condition of the eye where the light that comes in does not directly focus on the retina but in front of it, causing the image that one sees when looking at a distant object to be out of focus, but in focus when looking at a close object.
[10] That an Iron ship floats in water but an Iron ball sinks, is an example of -
A.
Newton's second law
B.
Pascal's law
C.
Archimedes Principle
D.
Dalton's law
Ans:
Archimedes Principle
Explanation :
The floating of an iron ship in water is an example of Archimedes principle. Archimedes' principle states that an object floats on water if the weight of the water displaced by it is equal to its weight. Since the average density of the ship as a whole is less than the density of water.
[11] A temperature rise in environment that disturbs life is called -
A.
water pollution
B.
nuclear pollution
C.
thermal pollution
D.
traffic pollution
Ans:
thermal pollution
Explanation :
Thermal pollution, the artificial warming of a body of water because of industrial waste or runoff from streets and parking lots, is becoming a common threat to the environment.
[12] What is the approximate height of a geostationary satellite from the surface of the earth?
A.
981 km
B.
15000 km
C.
35000 km
D.
55000 km
Ans:
35000 km
Explanation :
A satellite in such an orbit is at an altitude of approximately 35,786 km (22,236 mi) above mean sea level.
[13] What is the SI unit of frequency?
A.
Newton
B.
Watt
C.
Farad
D.
Hertz
Ans:
Hertz
Explanation :
The number of waves or vibrations passing through a point in one second is called Frequency. The SI (System International) Unit of Frequency is Hertz(Hz).
[14] The metallurgical process in which a metal is obtained in a fused state is called -
A.
roasting
B.
calcinations
C.
smelting
D.
froth floatation
Ans:
smelting
Explanation :
The metallurgical process in which a metal is obtained in a fused state is called smelting.
[15] Which one of the following elements shows variable equivalent mass?
A.
Zinc
B.
Silver
C.
Calcium
D.
Iron
Ans:
Iron
Explanation :
0
[16] Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth-
A.
remains same
B.
becomes half
C.
becomes twice
D.
becomes one-fourth
Ans:
becomes one-fourth
Explanation :
The gravitational force is proportional to 1/R2, where R is the distance from the centre of the Earth. So at a height of 2R from the centre of the earth, the corresponding weight would be one-fourth of the original weight.
[17] The dimensional formula for universal gravitational constant is –
A.
M⁻¹L³T²
B.
ML²T⁻²
C.
M⁻²
D.
M⁻¹L³T⁻²
Ans:
M⁻¹L³T⁻²
Explanation :
Universal Constant of Gravitation is represented by G and is derived from Newton's law of gravitation.
[18] Alpha particle is the nucleus of an atom of –
A.
Lithium
B.
Hydrogen
C.
Helium
D.
Oxygen
Ans:
Helium
Explanation :
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus, which is generally produced in the process of alpha decay.
[19] Which of the following supports particle nature of photons?
A.
Diffraction
B.
Polarization
C.
Photoelectric effect
D.
Interference
Ans:
Photoelectric effect
Explanation :
Light is made up of photons, so it has some particle properties. In the photoelectric effect, light hits some material which absorbs it, and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.
[20] 'Farad' is the unit of :
A.
Capacitance
B.
Inductance
C.
Resistance
D.
Conductance
Ans:
Capacitance
Explanation :
The Farad is the SI derived unit of capacitance. It is named after the English physicist Michael Faraday.
[21] Man perceives sound vibrations in the frequency ranges of –
A.
0 – 5 Hz
B.
6 - 10 Hz
C.
11 - 15 Hz
D.
20 - 20000 Hz
Ans:
20 - 20000 Hz
Explanation :
The frequencies at which a human being can perceive sound vary between 20 Hertz and 20,000 Hertz. It is within these frequency ranges that people can communicate to each other and listen to music.
[22] The quantum theory of light was given by -
A.
Einstein
B.
Plank
C.
Newton
D.
Faraday
Ans:
Plank
Explanation :
The Quantum theory of light was first discovered by Max Planck. In 1900, Planck, attempting to explain body radiation suggested that although light was a wave.
[23] The earth is a –
A.
good reflector of heat
B.
non-absorber of heat
C.
good absorber and good radiator of heat
D.
bad absorber and bad radiator of heat
Ans:
good absorber and good radiator of heat
Explanation :
The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
[24] Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
A.
Doppler’s Effect
B.
Newton’s law of cooling
C.
Kirchhoff’s Law
D.
Stefan’s Law
Ans:
Newton’s law of cooling
Explanation :
Kirchhoff’s Law – Kirchhoff’s Law signifies that good absorbers are good emitters. Stefan’s Law – The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
[25] Why does water tank appear shallower when viewed from the top?
A.
Due to reflection
B.
Due to refraction
C.
Due to diffraction
D.
Due to total internal reflection
Ans:
Due to refraction
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
Explanation :
Thermal pollution, the artificial warming of a body of water because of industrial waste or runoff from streets and parking lots, is becoming a common threat to the environment.
[12] What is the approximate height of a geostationary satellite from the surface of the earth?
A.
981 km
B.
15000 km
C.
35000 km
D.
55000 km
Ans:
35000 km
Explanation :
A satellite in such an orbit is at an altitude of approximately 35,786 km (22,236 mi) above mean sea level.
[13] What is the SI unit of frequency?
A.
Newton
B.
Watt
C.
Farad
D.
Hertz
Ans:
Hertz
Explanation :
The number of waves or vibrations passing through a point in one second is called Frequency. The SI (System International) Unit of Frequency is Hertz(Hz).
[14] The metallurgical process in which a metal is obtained in a fused state is called -
A.
roasting
B.
calcinations
C.
smelting
D.
froth floatation
Ans:
smelting
Explanation :
The metallurgical process in which a metal is obtained in a fused state is called smelting.
[15] Which one of the following elements shows variable equivalent mass?
A.
Zinc
B.
Silver
C.
Calcium
D.
Iron
Ans:
Iron
Explanation :
0
[16] Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth-
A.
remains same
B.
becomes half
C.
becomes twice
D.
becomes one-fourth
Ans:
becomes one-fourth
Explanation :
The gravitational force is proportional to 1/R2, where R is the distance from the centre of the Earth. So at a height of 2R from the centre of the earth, the corresponding weight would be one-fourth of the original weight.
[17] The dimensional formula for universal gravitational constant is –
A.
M⁻¹L³T²
B.
ML²T⁻²
C.
M⁻²
D.
M⁻¹L³T⁻²
Ans:
M⁻¹L³T⁻²
Explanation :
Universal Constant of Gravitation is represented by G and is derived from Newton's law of gravitation.
[18] Alpha particle is the nucleus of an atom of –
A.
Lithium
B.
Hydrogen
C.
Helium
D.
Oxygen
Ans:
Helium
Explanation :
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus, which is generally produced in the process of alpha decay.
[19] Which of the following supports particle nature of photons?
A.
Diffraction
B.
Polarization
C.
Photoelectric effect
D.
Interference
Ans:
Photoelectric effect
Explanation :
Light is made up of photons, so it has some particle properties. In the photoelectric effect, light hits some material which absorbs it, and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.
[20] 'Farad' is the unit of :
A.
Capacitance
B.
Inductance
C.
Resistance
D.
Conductance
Ans:
Capacitance
Explanation :
The Farad is the SI derived unit of capacitance. It is named after the English physicist Michael Faraday.
[21] Man perceives sound vibrations in the frequency ranges of –
A.
0 – 5 Hz
B.
6 - 10 Hz
C.
11 - 15 Hz
D.
20 - 20000 Hz
Ans:
20 - 20000 Hz
Explanation :
The frequencies at which a human being can perceive sound vary between 20 Hertz and 20,000 Hertz. It is within these frequency ranges that people can communicate to each other and listen to music.
[22] The quantum theory of light was given by -
A.
Einstein
B.
Plank
C.
Newton
D.
Faraday
Ans:
Plank
Explanation :
The Quantum theory of light was first discovered by Max Planck. In 1900, Planck, attempting to explain body radiation suggested that although light was a wave.
[23] The earth is a –
A.
good reflector of heat
B.
non-absorber of heat
C.
good absorber and good radiator of heat
D.
bad absorber and bad radiator of heat
Ans:
good absorber and good radiator of heat
Explanation :
The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
[24] Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
A.
Doppler’s Effect
B.
Newton’s law of cooling
C.
Kirchhoff’s Law
D.
Stefan’s Law
Ans:
Newton’s law of cooling
Explanation :
Kirchhoff’s Law – Kirchhoff’s Law signifies that good absorbers are good emitters. Stefan’s Law – The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
[25] Why does water tank appear shallower when viewed from the top?
A.
Due to reflection
B.
Due to refraction
C.
Due to diffraction
D.
Due to total internal reflection
Ans:
Due to refraction
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
Explanation :
The number of waves or vibrations passing through a point in one second is called Frequency. The SI (System International) Unit of Frequency is Hertz(Hz).
[14] The metallurgical process in which a metal is obtained in a fused state is called -
A.
roasting
B.
calcinations
C.
smelting
D.
froth floatation
Ans:
smelting
Explanation :
The metallurgical process in which a metal is obtained in a fused state is called smelting.
[15] Which one of the following elements shows variable equivalent mass?
A.
Zinc
B.
Silver
C.
Calcium
D.
Iron
Ans:
Iron
Explanation :
0
[16] Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth-
A.
remains same
B.
becomes half
C.
becomes twice
D.
becomes one-fourth
Ans:
becomes one-fourth
Explanation :
The gravitational force is proportional to 1/R2, where R is the distance from the centre of the Earth. So at a height of 2R from the centre of the earth, the corresponding weight would be one-fourth of the original weight.
[17] The dimensional formula for universal gravitational constant is –
A.
M⁻¹L³T²
B.
ML²T⁻²
C.
M⁻²
D.
M⁻¹L³T⁻²
Ans:
M⁻¹L³T⁻²
Explanation :
Universal Constant of Gravitation is represented by G and is derived from Newton's law of gravitation.
[18] Alpha particle is the nucleus of an atom of –
A.
Lithium
B.
Hydrogen
C.
Helium
D.
Oxygen
Ans:
Helium
Explanation :
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus, which is generally produced in the process of alpha decay.
[19] Which of the following supports particle nature of photons?
A.
Diffraction
B.
Polarization
C.
Photoelectric effect
D.
Interference
Ans:
Photoelectric effect
Explanation :
Light is made up of photons, so it has some particle properties. In the photoelectric effect, light hits some material which absorbs it, and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.
[20] 'Farad' is the unit of :
A.
Capacitance
B.
Inductance
C.
Resistance
D.
Conductance
Ans:
Capacitance
Explanation :
The Farad is the SI derived unit of capacitance. It is named after the English physicist Michael Faraday.
[21] Man perceives sound vibrations in the frequency ranges of –
A.
0 – 5 Hz
B.
6 - 10 Hz
C.
11 - 15 Hz
D.
20 - 20000 Hz
Ans:
20 - 20000 Hz
Explanation :
The frequencies at which a human being can perceive sound vary between 20 Hertz and 20,000 Hertz. It is within these frequency ranges that people can communicate to each other and listen to music.
[22] The quantum theory of light was given by -
A.
Einstein
B.
Plank
C.
Newton
D.
Faraday
Ans:
Plank
Explanation :
The Quantum theory of light was first discovered by Max Planck. In 1900, Planck, attempting to explain body radiation suggested that although light was a wave.
[23] The earth is a –
A.
good reflector of heat
B.
non-absorber of heat
C.
good absorber and good radiator of heat
D.
bad absorber and bad radiator of heat
Ans:
good absorber and good radiator of heat
Explanation :
The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
[24] Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
A.
Doppler’s Effect
B.
Newton’s law of cooling
C.
Kirchhoff’s Law
D.
Stefan’s Law
Ans:
Newton’s law of cooling
Explanation :
Kirchhoff’s Law – Kirchhoff’s Law signifies that good absorbers are good emitters. Stefan’s Law – The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
[25] Why does water tank appear shallower when viewed from the top?
A.
Due to reflection
B.
Due to refraction
C.
Due to diffraction
D.
Due to total internal reflection
Ans:
Due to refraction
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
Explanation :
0
[16] Weight of a person at a height of 2R from the centre of the earth, where R is the radius of the earth-
A.
remains same
B.
becomes half
C.
becomes twice
D.
becomes one-fourth
Ans:
becomes one-fourth
Explanation :
The gravitational force is proportional to 1/R2, where R is the distance from the centre of the Earth. So at a height of 2R from the centre of the earth, the corresponding weight would be one-fourth of the original weight.
[17] The dimensional formula for universal gravitational constant is –
A.
M⁻¹L³T²
B.
ML²T⁻²
C.
M⁻²
D.
M⁻¹L³T⁻²
Ans:
M⁻¹L³T⁻²
Explanation :
Universal Constant of Gravitation is represented by G and is derived from Newton's law of gravitation.
[18] Alpha particle is the nucleus of an atom of –
A.
Lithium
B.
Hydrogen
C.
Helium
D.
Oxygen
Ans:
Helium
Explanation :
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus, which is generally produced in the process of alpha decay.
[19] Which of the following supports particle nature of photons?
A.
Diffraction
B.
Polarization
C.
Photoelectric effect
D.
Interference
Ans:
Photoelectric effect
Explanation :
Light is made up of photons, so it has some particle properties. In the photoelectric effect, light hits some material which absorbs it, and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.
[20] 'Farad' is the unit of :
A.
Capacitance
B.
Inductance
C.
Resistance
D.
Conductance
Ans:
Capacitance
Explanation :
The Farad is the SI derived unit of capacitance. It is named after the English physicist Michael Faraday.
[21] Man perceives sound vibrations in the frequency ranges of –
A.
0 – 5 Hz
B.
6 - 10 Hz
C.
11 - 15 Hz
D.
20 - 20000 Hz
Ans:
20 - 20000 Hz
Explanation :
The frequencies at which a human being can perceive sound vary between 20 Hertz and 20,000 Hertz. It is within these frequency ranges that people can communicate to each other and listen to music.
[22] The quantum theory of light was given by -
A.
Einstein
B.
Plank
C.
Newton
D.
Faraday
Ans:
Plank
Explanation :
The Quantum theory of light was first discovered by Max Planck. In 1900, Planck, attempting to explain body radiation suggested that although light was a wave.
[23] The earth is a –
A.
good reflector of heat
B.
non-absorber of heat
C.
good absorber and good radiator of heat
D.
bad absorber and bad radiator of heat
Ans:
good absorber and good radiator of heat
Explanation :
The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
[24] Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
A.
Doppler’s Effect
B.
Newton’s law of cooling
C.
Kirchhoff’s Law
D.
Stefan’s Law
Ans:
Newton’s law of cooling
Explanation :
Kirchhoff’s Law – Kirchhoff’s Law signifies that good absorbers are good emitters. Stefan’s Law – The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
[25] Why does water tank appear shallower when viewed from the top?
A.
Due to reflection
B.
Due to refraction
C.
Due to diffraction
D.
Due to total internal reflection
Ans:
Due to refraction
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
Explanation :
Universal Constant of Gravitation is represented by G and is derived from Newton's law of gravitation.
[18] Alpha particle is the nucleus of an atom of –
A.
Lithium
B.
Hydrogen
C.
Helium
D.
Oxygen
Ans:
Helium
Explanation :
Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus, which is generally produced in the process of alpha decay.
[19] Which of the following supports particle nature of photons?
A.
Diffraction
B.
Polarization
C.
Photoelectric effect
D.
Interference
Ans:
Photoelectric effect
Explanation :
Light is made up of photons, so it has some particle properties. In the photoelectric effect, light hits some material which absorbs it, and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.
[20] 'Farad' is the unit of :
A.
Capacitance
B.
Inductance
C.
Resistance
D.
Conductance
Ans:
Capacitance
Explanation :
The Farad is the SI derived unit of capacitance. It is named after the English physicist Michael Faraday.
[21] Man perceives sound vibrations in the frequency ranges of –
A.
0 – 5 Hz
B.
6 - 10 Hz
C.
11 - 15 Hz
D.
20 - 20000 Hz
Ans:
20 - 20000 Hz
Explanation :
The frequencies at which a human being can perceive sound vary between 20 Hertz and 20,000 Hertz. It is within these frequency ranges that people can communicate to each other and listen to music.
[22] The quantum theory of light was given by -
A.
Einstein
B.
Plank
C.
Newton
D.
Faraday
Ans:
Plank
Explanation :
The Quantum theory of light was first discovered by Max Planck. In 1900, Planck, attempting to explain body radiation suggested that although light was a wave.
[23] The earth is a –
A.
good reflector of heat
B.
non-absorber of heat
C.
good absorber and good radiator of heat
D.
bad absorber and bad radiator of heat
Ans:
good absorber and good radiator of heat
Explanation :
The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
[24] Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
A.
Doppler’s Effect
B.
Newton’s law of cooling
C.
Kirchhoff’s Law
D.
Stefan’s Law
Ans:
Newton’s law of cooling
Explanation :
Kirchhoff’s Law – Kirchhoff’s Law signifies that good absorbers are good emitters. Stefan’s Law – The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
[25] Why does water tank appear shallower when viewed from the top?
A.
Due to reflection
B.
Due to refraction
C.
Due to diffraction
D.
Due to total internal reflection
Ans:
Due to refraction
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
Explanation :
Light is made up of photons, so it has some particle properties. In the photoelectric effect, light hits some material which absorbs it, and then ejects incident electrons. The reason that the photoelectric effect is evidence for the particle nature of light has to do with how materials absorb that light energy and then eject it in the form of electrons.
[20] 'Farad' is the unit of :
A.
Capacitance
B.
Inductance
C.
Resistance
D.
Conductance
Ans:
Capacitance
Explanation :
The Farad is the SI derived unit of capacitance. It is named after the English physicist Michael Faraday.
[21] Man perceives sound vibrations in the frequency ranges of –
A.
0 – 5 Hz
B.
6 - 10 Hz
C.
11 - 15 Hz
D.
20 - 20000 Hz
Ans:
20 - 20000 Hz
Explanation :
The frequencies at which a human being can perceive sound vary between 20 Hertz and 20,000 Hertz. It is within these frequency ranges that people can communicate to each other and listen to music.
[22] The quantum theory of light was given by -
A.
Einstein
B.
Plank
C.
Newton
D.
Faraday
Ans:
Plank
Explanation :
The Quantum theory of light was first discovered by Max Planck. In 1900, Planck, attempting to explain body radiation suggested that although light was a wave.
[23] The earth is a –
A.
good reflector of heat
B.
non-absorber of heat
C.
good absorber and good radiator of heat
D.
bad absorber and bad radiator of heat
Ans:
good absorber and good radiator of heat
Explanation :
The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
[24] Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
A.
Doppler’s Effect
B.
Newton’s law of cooling
C.
Kirchhoff’s Law
D.
Stefan’s Law
Ans:
Newton’s law of cooling
Explanation :
Kirchhoff’s Law – Kirchhoff’s Law signifies that good absorbers are good emitters. Stefan’s Law – The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
[25] Why does water tank appear shallower when viewed from the top?
A.
Due to reflection
B.
Due to refraction
C.
Due to diffraction
D.
Due to total internal reflection
Ans:
Due to refraction
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
Explanation :
The frequencies at which a human being can perceive sound vary between 20 Hertz and 20,000 Hertz. It is within these frequency ranges that people can communicate to each other and listen to music.
[22] The quantum theory of light was given by -
A.
Einstein
B.
Plank
C.
Newton
D.
Faraday
Ans:
Plank
Explanation :
The Quantum theory of light was first discovered by Max Planck. In 1900, Planck, attempting to explain body radiation suggested that although light was a wave.
[23] The earth is a –
A.
good reflector of heat
B.
non-absorber of heat
C.
good absorber and good radiator of heat
D.
bad absorber and bad radiator of heat
Ans:
good absorber and good radiator of heat
Explanation :
The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
[24] Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
A.
Doppler’s Effect
B.
Newton’s law of cooling
C.
Kirchhoff’s Law
D.
Stefan’s Law
Ans:
Newton’s law of cooling
Explanation :
Kirchhoff’s Law – Kirchhoff’s Law signifies that good absorbers are good emitters. Stefan’s Law – The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
[25] Why does water tank appear shallower when viewed from the top?
A.
Due to reflection
B.
Due to refraction
C.
Due to diffraction
D.
Due to total internal reflection
Ans:
Due to refraction
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
Explanation :
The earth's surface radiates as a black body, since it aborts and radiates with nearly 100 percent efficiency for its temperatures. Gases, on the contrary, are selective absorbers and radiators.
[24] Which law states, “The rate of loss of heat by a body is directly proportional to the difference in temperature between the body and the surroundings.”
A.
Doppler’s Effect
B.
Newton’s law of cooling
C.
Kirchhoff’s Law
D.
Stefan’s Law
Ans:
Newton’s law of cooling
Explanation :
Kirchhoff’s Law – Kirchhoff’s Law signifies that good absorbers are good emitters. Stefan’s Law – The radiant energy emitted by a black body per unit area per unit time is directly proportional to the fourth power of its absolute temperature.
[25] Why does water tank appear shallower when viewed from the top?
A.
Due to reflection
B.
Due to refraction
C.
Due to diffraction
D.
Due to total internal reflection
Ans:
Due to refraction
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.
Explanation :
Water in a swimming pool or water tank appears shallower than its depth because of the refraction of light. The light travels straight as long as it is in the water, but if it emerges obliquely from the water into the air it is bent downward toward the surface.