Are you looking for interview questions / general knowledge questions over internet? You have reached the right place to get a solution for your search. In this post, you will find GK questions with answers for the subject Physics. It's general physics that everybody should have some knowledge on it. The sentences in bold represents the answer of question. Multiple choice questions with answers are listed out, Go though the questions and enrich your knowledge in the field of Physics.
1. Radiocarbon is produced in the atmosphere as a result of
A. Collision between fast neutrons and nitrogen nuclei present in the atmosphere
B. Action of ultraviolet light from the sun on atmospheric oxygen
C. Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
D. Lightning discharge in atmosphere
2. It is easier to roll a stone up a sloping road than to lift it vertical upwards because
A. work done in rolling is more than in lifting
B. work done in lifting the stone is equal to rolling it
C. work done in both is same but the rate of doing work is less in rolling
D. work done in rolling a stone is less than in lifting it
3. The absorption of ink by blotting paper involves
A. viscosity of ink
B. capillary action phenomenon
C. diffusion of ink through the blotting
D. siphon action
4. Siphon will fail to work if
A. the densities of the liquid in the two vessels are equal
B. the level of the liquid in the two vessels are at the same height
C. both its limbs are of unequal length
D. the temperature of the liquids in the two vessels are the same
5. Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to
A. the heating effect of current alone
B. hysteresis loss alone
C. both the heating effect of current and hysteresis loss
D. intense sunlight at noon
6. Nuclear sizes are expressed in a unit named
A. Fermi B. angstrom
C. newton D. tesla
7. Light year is a unit of
A. time B. distance
C. light D. intensity of light
8. Mirage is due to
A. unequal heating of different parts of the atmosphere
B. magnetic disturbances in the atmosphere
C. depletion of ozone layer in the atmosphere
D. equal heating of different parts of the atmosphere
9. Light from the Sun reaches us in nearly
A. 2 minutes
B. 4 minutes
C. 8 minutes
D. 16 minutes
10. Stars appears to move from east to west because
A. all stars move from east to west
B. the earth rotates from west to east
C. the earth rotates from east to west
D. the background of the stars moves from west to east
11. Pa(Pascal) is the unit for
A. thrust B. pressure
C. frequency D. conductivity
12. Planets do not twinkle because
A. they emit light of a constant intensity
B. their distance from the earth does not change with time
C. they are very far away from the earth resulting in decrease in intensity of light
D. they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable
13. Metals are good conductors of electricity because
A. they contain free electrons
B. the atoms are lightly packed
C. they have high melting point
D. All of the above
14. Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
A. will overflow
B. will not rise
C. depressed
D. change its meniscus
15. Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
A. Pressure and Young's modules
B. Planck's constant and Angular momentum
C. Impulse and moment of force
D. Force and rate of change of linear momentum
16. If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same
A. velocity B. momentum
C. acceleration D. kinetic energy
17. Pick out the scalar quantity
A. force B. pressure
C. velocity D. acceleration
18. Rectifiers are used to convert
A. Direct current to Alternating current
B. Alternating current to Direct current
C. high voltage to low voltage
D. low voltage to high voltage
19. out of the following, which is not emitted by radioactive substance?
A. Electrons
B. Electromagnetic radiations
C. Alpha particles
D. Neutrons
20. Sound waves in air are
A. transverse B. longitudinal
C. electromagnetic D. polarised
21. Magnetism at the centre of a bar magnet is
A. minimum B. maximum
C. zero D. minimum or maximum
22. It is more difficult to walk on a sandy road than on a concrete road because
A. sand is soft and concreter is hard
B. the friction between sand and feet is less than that between concrete and feet
C. the friction between sand and feet is more than that between concrete and feet
D. the sand is grainy but concrete is smooth
23. Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
A. 0.14 m/s
B. 140 m/s
C. 1.4 km/s
D. 14 m/s
24. Of the following properties of a wave, the one that is independent of the other is its
A. amplitude B. velocity
C. wavelength D. frequency
25. Lux is the SI unit of
A. intensity of illumination
B. luminous efficiency
C. luminous flux
D. luminous intensity
26. On a rainy day, small oil films on water show brilliant colours. This is due to
A. dispersion B. interference
C. diffraction D. polarization
27. Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
A. move towards A
B. move towards B
C. move at right angles to the line joining A and B
D. remain at rest
28. Materials for rain-proof coats and tents owe their water-proof properties to
A. surface tension
B. viscosity
C. specific gravity
D. elasticity
29. RADAR is used for
A. locating submerged submarines
B. receiving a signals in a radio receiver
C. locating geostationary satellites
D. detecting and locating the position of objects such as aeroplanes
30. Sound of frequency below 20 Hz is called
A. audio sounds
B. infrasonic
C. ultrasonic
D. supersonics
31. On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
A. mercury is a metal
B. density of mercury is greater than that of water
C. cohesion of mercury is greater than its adhesion with glass
D. cohesion of water is greater than its adhesion with glass
32. Suitable impurities are added to a semiconductor depending on its use. This is done in order to
A. increase its life
B. enable it to withstand higher voltages
C. increase its electrical conductivity
D. increase its electrical resistivity
33. Stars twinkle because
A. the intensity of light emitted by them changes with time
B. the distance of the stars from the earth changes with time
C. the refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a start changes with time
D. the light from the star is scattered by the dust particles and air molecules in the earth's atmosphere
34. It takes much longer to cook food in the hills than in the plains, because
A. in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
B. due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
C. in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere
D. in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
35. Moment of inertia is
A. vector B. scalar
C. phasor D. tensor
36. Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?
A. Rainbow B. Earthshine
C. Halo D. Mirage
37. Inside an aeroplane, flying at a high altitude,
A. the pressure is the same as that outside
B. normal atmospheric pressure is maintained by the use of air pumps
C. the pressure inside is less than the pressure outside
D. normal humidity and partial vacuum are maintained
38. Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
A. Water, iron and air
B. Iron, air and water
C. Air, water and iron
D. Iron, water and air
39. One thousand microns is equal to
A. 10-3m B. 10-6m
C. 10-9m D. 10-12m
40. Sound travels at the fastest speed in
A. steel B. water
C. air D. vacuum
41. oil raise up the wick in a lamp. The principle involves
A. the diffusion of oil through the wick
B. the liquid state of oil
C. capillary action phenomenon
D. volatility of oil
42. Superconductors are substances which
A. conduct electricity at low temperature
B. offer high resistance to the flow of current
C. offer no resistance to the flow of electricity
D. conduct electricity at high temperatures
43. Light travels at the fastest speed in
A. glass B. water
C. hydrogen D. vacuum
44. Railway tracks are banked on curves
A. necessary centrifugal force may be obtained from the horizontal component weight of the train
B. to avoid frictional force between the tracks and wheels
C. necessary centripetal force may be obtained from the horizontal component of the weight of the train
D. the train may not fly off in the opposite direction
45. On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because
A. metals have higher thermal capacity than plastics
B. plastics have a lower density than metals
C. metals are good conductor of heat
D. plastics have a higher thermal conductivity than metals
46. Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
A. 1.8 km, 0.15 km
B. 2.2 km, 0.20 km
C. 2.8 km, 0.25 km
D. 3.3 km, 0.30 km
47. Intensity of sound at a point is ____ its distance from the source.
A. directly proportional to
B. inversely proportional to
C. directly proportional to square of
D. inversely proportional to square of
48. Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
A. at sea level
B. at the top of Mt. Everest
C. at a place in a valley below sea level
D. in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
49. Radio telescopes are better than optical telescopes because
A. they can detect faint galaxies which no optical telescope can
B. they can work even in cloudy conditions
C. they can work during the day and night
D. All of the above
50. Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
A. X-rays
B. ultraviolet light
C. visible light
D. radio waves
51. Out of the following pairs, which one does not have identical dimension?
A. Moment of inertia and moment of a force
B. Work and Torque
C. Angular momentum and Planck's constant
D. Impulse and Momentum
52. Mercury is commonly used as a thermometric fluid rather than water because
A. specific heat of mercury is less than water
B. specific heat of mercury is more than water
C. mercury has greater visibility than water
D. density of mercury is more than the water
53. Optical fibre works on the
A. principle of refraction
B. total internal reflection
C. scattering
D. interference
54. Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
A. 4.2 seconds
B. 42 seconds
C. 4.2 years
D. 42 years
55. Supersonic plane fly with the speed
A. less than the speed of sound
B. of sound
C. greater than the speed of sound
D. of light
56. Mach number is used in connection with the speed of
A. sound B. aircraft
C. spacecraft D. ships
57. On a stationary sail boat, air is blown from a fan attached to the boat. The boat
A. moves in opposite direction in which the air is blown
B. does not move
C. moves in the same direction in which air blows
D. spins around
58. Rainbow is due to
A. absorption of sunlight in minute water droplets
B. diffusion of sunlight through water droplets
C. ionisation of water deposits
D. refraction and reflection of sunlight by water droplets
59. Stars which appear single to the naked eye but are double when seen through a telescope are
A. novas and supernovas
B. binaries
C. asteroids
D. quasars
60. ML2T-2 is the dimensional formula for
A. moment of inertia
B. pressure
C. elasticity
D. couple acting on a body
61. Solar eclipse will take place when
A. the sun is between the moon and the earth
B. the earth is between the moon and the sun
C. the moon is between the sun and the earth
D. the moon does not lie on the line joining the sun and the earth
62. Isotopes of an element contain
A. the same number of protons but different number of neutrons
B. the same number of neutrons but different number of protons
C. equal number of protons and electrons
D. equal number of nucleons
63. One watt-hour is equivalent to
A. 6.3 x 103 J
B. 6.3 x 10-7 J
C. 3.6 x 103 J
D. 3.6 x 10-3 J
64. Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
A. Scattering B. Diffraction
C. Interference D. Polarization
65. In which of the following industries is mica as a raw material?
A. Cement
B. Glass and Pottery
C. Iron and Steel
D. Electrical
66. Radiocarbon dating technique is used to estimate the age of
A. rocks B. monuments
C. soil D. fossils
67. Identify the vector quantity from the following
A. Heat
B. Angular momentum
C. Time
D. Work
68. Large astronomical telescopes always use as objective
A. lens
B. mirror
C. combinations of lenses
D. None of the above
69. One should not connect a number of electrical appliances to the same power socket because
A. this can damage the appliances due to overloading
B. this can damage the domestic wiring due to overloading
C. this can damage the electrical meter
D. the appliance will not get full voltage
70. Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?
Diffusion
Refraction
Internal reflection
A. I, II and III
B. I and II
C. II and III
D. I and III
71. Natural radioactivity was discovered by
A. Marie Curie
B. Ernest Rutherfor
C. Henri Becquerel
D. Enrico Fermi
72. Planets are
A. luminous heavenly bodies revolving around a star
B. non-luminous heavenly bodies
C. luminous heavenly bodies that twinkle
D. luminous heavenly bodies that do not twinkle
73. One nanometer is equal to
A. 10-6m B. 10-8m
C. 10-9m D. 10-5m
74. Mica is used in electrical appliances such as electric iron because mica is
A. a good conductor of heat but a bad conductor of electricity
B. a bad conductor of heat but a good conductor of electricity
C. a good conductor of heat as well as electricity
D. a bad conductor of heat as well as electricity
75. It is easier to roll a barrel full of coal tar than to pull it because
A. the full weight of the barrel comes into play when it is pulled
B. the rolling friction is much less than the sliding friction
C. more surface area of the barrel is in contact with the road when it is pulled
D. coal tar is a liquid and it flows in the barrel when it is rolled
76. Minimum number of unequal vectors which can give zero resultant are
A. two B. three
C. four D. more than four
77. Intensity of sound has
A. an object existence
B. a subject existence
C. no existence
D. both subjective and objective existence
78. Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
A. east B. west
C. northeast D. southeast
79. An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
A. 1200 m
B. 0.33 km
C. 3.33 km
D. 33 km
1. Radiocarbon is produced in the atmosphere as a result of
A. Collision between fast neutrons and nitrogen nuclei present in the atmosphere
B. Action of ultraviolet light from the sun on atmospheric oxygen
C. Action of solar radiations particularly cosmic rays on carbon dioxide present in the atmosphere
D. Lightning discharge in atmosphere
2. It is easier to roll a stone up a sloping road than to lift it vertical upwards because
A. work done in rolling is more than in lifting
B. work done in lifting the stone is equal to rolling it
C. work done in both is same but the rate of doing work is less in rolling
D. work done in rolling a stone is less than in lifting it
3. The absorption of ink by blotting paper involves
A. viscosity of ink
B. capillary action phenomenon
C. diffusion of ink through the blotting
D. siphon action
4. Siphon will fail to work if
A. the densities of the liquid in the two vessels are equal
B. the level of the liquid in the two vessels are at the same height
C. both its limbs are of unequal length
D. the temperature of the liquids in the two vessels are the same
5. Large transformers, when used for some time, become very hot and are cooled by circulating oil. The heating of the transformer is due to
A. the heating effect of current alone
B. hysteresis loss alone
C. both the heating effect of current and hysteresis loss
D. intense sunlight at noon
6. Nuclear sizes are expressed in a unit named
A. Fermi B. angstrom
C. newton D. tesla
7. Light year is a unit of
A. time B. distance
C. light D. intensity of light
8. Mirage is due to
A. unequal heating of different parts of the atmosphere
B. magnetic disturbances in the atmosphere
C. depletion of ozone layer in the atmosphere
D. equal heating of different parts of the atmosphere
9. Light from the Sun reaches us in nearly
A. 2 minutes
B. 4 minutes
C. 8 minutes
D. 16 minutes
10. Stars appears to move from east to west because
A. all stars move from east to west
B. the earth rotates from west to east
C. the earth rotates from east to west
D. the background of the stars moves from west to east
11. Pa(Pascal) is the unit for
A. thrust B. pressure
C. frequency D. conductivity
12. Planets do not twinkle because
A. they emit light of a constant intensity
B. their distance from the earth does not change with time
C. they are very far away from the earth resulting in decrease in intensity of light
D. they are nearer to earth and hence we receive a greater amount of light and, therefore minor variations in the intensity are not noticeable
13. Metals are good conductors of electricity because
A. they contain free electrons
B. the atoms are lightly packed
C. they have high melting point
D. All of the above
14. Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
A. will overflow
B. will not rise
C. depressed
D. change its meniscus
15. Out of the following pairs, choose the pair in which the physical quantities do not have identical dimension?
A. Pressure and Young's modules
B. Planck's constant and Angular momentum
C. Impulse and moment of force
D. Force and rate of change of linear momentum
16. If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same
A. velocity B. momentum
C. acceleration D. kinetic energy
17. Pick out the scalar quantity
A. force B. pressure
C. velocity D. acceleration
18. Rectifiers are used to convert
A. Direct current to Alternating current
B. Alternating current to Direct current
C. high voltage to low voltage
D. low voltage to high voltage
19. out of the following, which is not emitted by radioactive substance?
A. Electrons
B. Electromagnetic radiations
C. Alpha particles
D. Neutrons
20. Sound waves in air are
A. transverse B. longitudinal
C. electromagnetic D. polarised
21. Magnetism at the centre of a bar magnet is
A. minimum B. maximum
C. zero D. minimum or maximum
22. It is more difficult to walk on a sandy road than on a concrete road because
A. sand is soft and concreter is hard
B. the friction between sand and feet is less than that between concrete and feet
C. the friction between sand and feet is more than that between concrete and feet
D. the sand is grainy but concrete is smooth
23. Find the maximum velocity for the overturn of a car moving on a circular track of radius 100 m. The co-efficient of friction between the road and tyre is 0.2
A. 0.14 m/s
B. 140 m/s
C. 1.4 km/s
D. 14 m/s
24. Of the following properties of a wave, the one that is independent of the other is its
A. amplitude B. velocity
C. wavelength D. frequency
25. Lux is the SI unit of
A. intensity of illumination
B. luminous efficiency
C. luminous flux
D. luminous intensity
26. On a rainy day, small oil films on water show brilliant colours. This is due to
A. dispersion B. interference
C. diffraction D. polarization
27. Point A is at a lower electrical potential than point B. An electron between them on the line joining them will
A. move towards A
B. move towards B
C. move at right angles to the line joining A and B
D. remain at rest
28. Materials for rain-proof coats and tents owe their water-proof properties to
A. surface tension
B. viscosity
C. specific gravity
D. elasticity
29. RADAR is used for
A. locating submerged submarines
B. receiving a signals in a radio receiver
C. locating geostationary satellites
D. detecting and locating the position of objects such as aeroplanes
30. Sound of frequency below 20 Hz is called
A. audio sounds
B. infrasonic
C. ultrasonic
D. supersonics
31. On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
A. mercury is a metal
B. density of mercury is greater than that of water
C. cohesion of mercury is greater than its adhesion with glass
D. cohesion of water is greater than its adhesion with glass
32. Suitable impurities are added to a semiconductor depending on its use. This is done in order to
A. increase its life
B. enable it to withstand higher voltages
C. increase its electrical conductivity
D. increase its electrical resistivity
33. Stars twinkle because
A. the intensity of light emitted by them changes with time
B. the distance of the stars from the earth changes with time
C. the refractive index of the different layers of the earth's atmosphere changes continuously, consequently the position of the image of a start changes with time
D. the light from the star is scattered by the dust particles and air molecules in the earth's atmosphere
34. It takes much longer to cook food in the hills than in the plains, because
A. in the hills the atmospheric pressure is lower than that in the plains and therefore water boils at a temperature lower than 100oC causing an increase in cooking time
B. due to low atmospheric pressure on the hills, the water boils at a temperature higher than 100oC and therefore water takes longer to boil
C. in the hills the atmospheric density is low and therefore a lot of heat is lost to the atmosphere
D. in the hills the humidity is high and therefore a lot of heat is absorbed by the atmosphere leaving very little heat for cooking
35. Moment of inertia is
A. vector B. scalar
C. phasor D. tensor
36. Of the following natural phenomena, tell which one known in Sanskrit as 'deer's thirst'?
A. Rainbow B. Earthshine
C. Halo D. Mirage
37. Inside an aeroplane, flying at a high altitude,
A. the pressure is the same as that outside
B. normal atmospheric pressure is maintained by the use of air pumps
C. the pressure inside is less than the pressure outside
D. normal humidity and partial vacuum are maintained
38. Sound travels with a different speed in media. In what order does the velocity of sound increase in these media?
A. Water, iron and air
B. Iron, air and water
C. Air, water and iron
D. Iron, water and air
39. One thousand microns is equal to
A. 10-3m B. 10-6m
C. 10-9m D. 10-12m
40. Sound travels at the fastest speed in
A. steel B. water
C. air D. vacuum
41. oil raise up the wick in a lamp. The principle involves
A. the diffusion of oil through the wick
B. the liquid state of oil
C. capillary action phenomenon
D. volatility of oil
42. Superconductors are substances which
A. conduct electricity at low temperature
B. offer high resistance to the flow of current
C. offer no resistance to the flow of electricity
D. conduct electricity at high temperatures
43. Light travels at the fastest speed in
A. glass B. water
C. hydrogen D. vacuum
44. Railway tracks are banked on curves
A. necessary centrifugal force may be obtained from the horizontal component weight of the train
B. to avoid frictional force between the tracks and wheels
C. necessary centripetal force may be obtained from the horizontal component of the weight of the train
D. the train may not fly off in the opposite direction
45. On a cold day when a room temperature is 15oC, the metallic cap of a pen becomes much colder than its plastic body, though both are at the same temperature of 15oC, because
A. metals have higher thermal capacity than plastics
B. plastics have a lower density than metals
C. metals are good conductor of heat
D. plastics have a higher thermal conductivity than metals
46. Sound produced at a point is heard by a person after 5 second, while the same sound is heard by another person after 6 seconds. If the speed of sound is 300 m/s, what could be the maximum and minimum distances between the two persons?
A. 1.8 km, 0.15 km
B. 2.2 km, 0.20 km
C. 2.8 km, 0.25 km
D. 3.3 km, 0.30 km
47. Intensity of sound at a point is ____ its distance from the source.
A. directly proportional to
B. inversely proportional to
C. directly proportional to square of
D. inversely proportional to square of
48. Of the four locations mentioned below the highest inside temperature will be attained in the pressure cooker operated with the pressure valve open
A. at sea level
B. at the top of Mt. Everest
C. at a place in a valley below sea level
D. in an aeroplane flying at a height of 10,000 m with inside pressure maintained at the sea level
49. Radio telescopes are better than optical telescopes because
A. they can detect faint galaxies which no optical telescope can
B. they can work even in cloudy conditions
C. they can work during the day and night
D. All of the above
50. Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
A. X-rays
B. ultraviolet light
C. visible light
D. radio waves
51. Out of the following pairs, which one does not have identical dimension?
A. Moment of inertia and moment of a force
B. Work and Torque
C. Angular momentum and Planck's constant
D. Impulse and Momentum
52. Mercury is commonly used as a thermometric fluid rather than water because
A. specific heat of mercury is less than water
B. specific heat of mercury is more than water
C. mercury has greater visibility than water
D. density of mercury is more than the water
53. Optical fibre works on the
A. principle of refraction
B. total internal reflection
C. scattering
D. interference
54. Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in
A. 4.2 seconds
B. 42 seconds
C. 4.2 years
D. 42 years
55. Supersonic plane fly with the speed
A. less than the speed of sound
B. of sound
C. greater than the speed of sound
D. of light
56. Mach number is used in connection with the speed of
A. sound B. aircraft
C. spacecraft D. ships
57. On a stationary sail boat, air is blown from a fan attached to the boat. The boat
A. moves in opposite direction in which the air is blown
B. does not move
C. moves in the same direction in which air blows
D. spins around
58. Rainbow is due to
A. absorption of sunlight in minute water droplets
B. diffusion of sunlight through water droplets
C. ionisation of water deposits
D. refraction and reflection of sunlight by water droplets
59. Stars which appear single to the naked eye but are double when seen through a telescope are
A. novas and supernovas
B. binaries
C. asteroids
D. quasars
60. ML2T-2 is the dimensional formula for
A. moment of inertia
B. pressure
C. elasticity
D. couple acting on a body
61. Solar eclipse will take place when
A. the sun is between the moon and the earth
B. the earth is between the moon and the sun
C. the moon is between the sun and the earth
D. the moon does not lie on the line joining the sun and the earth
62. Isotopes of an element contain
A. the same number of protons but different number of neutrons
B. the same number of neutrons but different number of protons
C. equal number of protons and electrons
D. equal number of nucleons
63. One watt-hour is equivalent to
A. 6.3 x 103 J
B. 6.3 x 10-7 J
C. 3.6 x 103 J
D. 3.6 x 10-3 J
64. Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
A. Scattering B. Diffraction
C. Interference D. Polarization
65. In which of the following industries is mica as a raw material?
A. Cement
B. Glass and Pottery
C. Iron and Steel
D. Electrical
66. Radiocarbon dating technique is used to estimate the age of
A. rocks B. monuments
C. soil D. fossils
67. Identify the vector quantity from the following
A. Heat
B. Angular momentum
C. Time
D. Work
68. Large astronomical telescopes always use as objective
A. lens
B. mirror
C. combinations of lenses
D. None of the above
69. One should not connect a number of electrical appliances to the same power socket because
A. this can damage the appliances due to overloading
B. this can damage the domestic wiring due to overloading
C. this can damage the electrical meter
D. the appliance will not get full voltage
70. Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this?
Diffusion
Refraction
Internal reflection
A. I, II and III
B. I and II
C. II and III
D. I and III
71. Natural radioactivity was discovered by
A. Marie Curie
B. Ernest Rutherfor
C. Henri Becquerel
D. Enrico Fermi
72. Planets are
A. luminous heavenly bodies revolving around a star
B. non-luminous heavenly bodies
C. luminous heavenly bodies that twinkle
D. luminous heavenly bodies that do not twinkle
73. One nanometer is equal to
A. 10-6m B. 10-8m
C. 10-9m D. 10-5m
74. Mica is used in electrical appliances such as electric iron because mica is
A. a good conductor of heat but a bad conductor of electricity
B. a bad conductor of heat but a good conductor of electricity
C. a good conductor of heat as well as electricity
D. a bad conductor of heat as well as electricity
75. It is easier to roll a barrel full of coal tar than to pull it because
A. the full weight of the barrel comes into play when it is pulled
B. the rolling friction is much less than the sliding friction
C. more surface area of the barrel is in contact with the road when it is pulled
D. coal tar is a liquid and it flows in the barrel when it is rolled
76. Minimum number of unequal vectors which can give zero resultant are
A. two B. three
C. four D. more than four
77. Intensity of sound has
A. an object existence
B. a subject existence
C. no existence
D. both subjective and objective existence
78. Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
A. east B. west
C. northeast D. southeast
79. An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically at a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is
A. 1200 m
B. 0.33 km
C. 3.33 km
D. 33 km
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