Physics – Set 8 – LearnZeal

Physics – General – LS

Physics – Set 8

Dear ! This is Physics – Set 8 Quiz and it contains 100 questions.

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1 / 100

1. Fat can be seperated from milk in a cream seperator because of :

Cohesive Force

Gravitational Force

Centripetal Force

Centrifugal Force

2 / 100

2. A particle is thrown vertically upward. When it reaches the highest point, it has

A downward acceleration

An upward acceleration

A downward velocity

A horizontal velocity

3 / 100

3. Work done in a free expansion process is

Minimun

Maximum

None of these

4 / 100

4. In a photocell light energy is converted into

Potential energy

Chemical energy

Heat energy

Electrical energy

5 / 100

5. A bomb at rest explodes into a large number of tiny fragments. The total momentum of all the fragments

Is zero

Depends on the total mass of all the fragments

Depends on the speeds of various fragments

Is infinity

6 / 100

6. A cyclist leans inwards when he is negotiating a curve so that

He may increase his speed

His weight may be reduced

Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.

No frictional force may be produced between the wheels and the axle

7 / 100

7. A sphere rolls down on two inclined planes of different angles but same height, it does so

In the same time

With the same speed

In the same time with the same speed

In the same time with the same kinetic energy

8 / 100

8. If both the mass and the velocity of a body is increased to twice of their magnitude, the kinetic energy will increase by

2 times

4 times

8 times

16 times

9 / 100

9. A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

A parabola

A horizontal straight line

A vertical straight line

A circle

10 / 100

10. For which one of the following does the centre of mass lie outside the body?

A fountain pen

A cricket ball

A ring

A book

11 / 100

11. 1 Joule is Equal to

10^3 ergs

10^6 ergs

10^7 ergs

10^5 ergs

12 / 100

12. A bullet is fired from a rifle which recoils after firing. The ratio of kinetic energy of the rifle to that of the bullet is

Zero

One

Less than one

More than one

13 / 100

13. The device used to convert solar energy into electricity is

Photovoltaic cell

Daniell cell

Electrochemical cell

Galvanic cell

14 / 100

14. What is the direction of torque?

Perpendicular to the direction of applied force

Same as the direction of applied force

Opposite to the direction of applied force

Parallel to the radius

15 / 100

15. What is the change in the angular momentum of a system as per the Law of Conservation of Angular momentum, if the total external torque acting is zero?

Remains constant

Becomes zero

Increases exponentially

None of these

16 / 100

16. What type of force acts on a car moving around a curve?

Centrifugal force

Cohesive force

Centripetal force

Gravitational force

17 / 100

17. When milk is churned, the cream separates from it due to:

Frictional force

Centrifugal force

Gravitational force

Viscous forces

18 / 100

18. A particle dropped from the top of a tower uniformly falls on ground at a distance which is equal to the height of tower. Which of the following paths will be traversed by the particle ?

Circle

Parabolic

Great circle

Hyper–parabolic

19 / 100

19. If the velocity of a body is halved its kinetic energy ________

Become 4 times

Becomes 1/4 th

Is also doubled

Becomes half

20 / 100

20. Damp clothes are dried in spin dryers by the action of

Centripetal forces

Centrifugal forces

Central forces

Non central forces

21 / 100

21. The energy stored in a watch spring is

Kinetic energy

Potential energy

Heat energy

Chemical energy

22 / 100

22. The term ”Higgs Boson’ is associated with

Nano Technology

Oncology

God Particle

Stem Cell Research

23 / 100

23. A body moving in a circular path with a constant speed has a

Constant velocity

Constant acceleration

Constant kinetic energy

Constant displacement

24 / 100

24. The device which converts sound energy into electrical energy is called

Amplifier

Speaker

Microphone

Transmitter

25 / 100

25. In hydro power station, the motion produced in turbines is due to

Flow of water

Burning of coal

Burning of diesel

Production of steam

26 / 100

26. The point where total mass of a body is supposed to be concentrated is known as

Dead centre

Centre of mass

Centre of gravity

Centre of motion

27 / 100

27. Small bubbles are perfectly spherical because of

Gravity

Pressure

Viscosity

Surface tension

28 / 100

28. What should a person on a freely rotating turn table do to decrease his (angular) speed ?

Bring his hands together

Raise his hands up

Spread his hands outwards

Sit down with raised hands

29 / 100

29. A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

Both the spheres will reach the ground simultaneously.

A will reach the ground first.

B will reach the ground first.

The question is incomplete because the masses of the spheres are not given.

30 / 100

30. Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen?

The heavier mass will reach greater height

The lighter mass will reach greater height

Both will reach the same height

Any of them may reach greater height

31 / 100

31. Force of impact is the force

By the objects weight

By the speed of the object

When the objects meet

None of these

32 / 100

32. The motion of a body around a circular path is an example of

Uniform velocity, variable acceleration

Uniform speed, uniform velocity

Uniform speed, variable velocity

Uniform speed, variable acceleration

33 / 100

33. When all the forces and torques are balanced in a mechanical body it is said to be in

Equilibrium

Static

Buoyancy

None of these

34 / 100

34. Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen?

The heavier mass will reach greater height

The lighter mass will reach greater height

Both will reach the same height

Any of them may reach greater height

35 / 100

35. In a water lifting electric pump, we convert

Electrical energy into Potential energy

Kinetic energy into Electrical energy

Kinetic energy into Potential energy

Electrical energy into Kinetic energy

36 / 100

36. Electric Motor converts ________ energy to mechanical energy

Sound

Mechanical

Chemical

Electrical

37 / 100

37. In a rechargeable cell what kind of energy is stored within the cell?

Electrical energy

Potential energy

Chemical energy

Kinetic energy

38 / 100

38. An object that has kinetic energy must be

At an elevated position

Falling

At rest

Moving

39 / 100

39. Velocitation is the tendency to

Be traveling at a speed that is faster than perceived

Be traveling at a speed that is slower than perceived

Both A & B

None of these

40 / 100

40. A photo-electric cell converts

Mechanical energy to electric energy

Heat energy to mechanical energy

Light energy to chemical energy

Light energy to electrical energy

41 / 100

41. If the velocity-time graph of a particle is represented by y = mt + c, then the particle is moving with

Constant speed

Constant velocity

Constant acceleration

Varying acceleration

42 / 100

42. Which of the following is not a property of heavy water ?

Boiling point of heavy water is lower than that or ordinary water

Density of heavy water is higher than that of ordinary water

Freezing point of heavy water is higher than that of ordinary water

It produces corrosion

43 / 100

43. A voltaic cell converts chemical energy to

Heat energy

Electrical energy

Mechanical energy

Light energy

44 / 100

44. A person does some work of 1,000 J in 2 s. His power will be ________

1000W

25W

500W

50W

45 / 100

45. In which of the following cases, kinetic energy is being used in performing work ?

Paddling the bicycle to cover a distance

Driving a car to cover a distance

Wind mill grinding wheat grain

Rowing a boat in the lake

46 / 100

46. Which of the following liquids is most viscous?

Oil

Milk

Water

Petrol

47 / 100

47. An object of 10 kg is moving with a speed of 2 m/s. The kinetic energy of the object is

20 J

25 J

10 J

40 J

48 / 100

48. The law of conservation of energy states that

Energy can neither be created nor destroyed

Energy can either be created nor destroyed

Energy can neither be created or destroyed

Energy can either be created or destroyed

49 / 100

49. The SI unit for measuring work and energy is

Joule

Watt

Farad

Ohm

50 / 100

50. Conversion of sound energy into electrical energy is done by

Solar cell

Gramophone

Microphone

Loudspeaker

51 / 100

51. A bullet of mass 10gm is fired with a velocity of 40 m/s from a gun of mass 8 kg. Find the recoil velocity (in m/s) of the gun.

0.1

0.05

52 / 100

52. It is easier to carry two buckets of water in one hand each, than to carry only one in one hand because

Weights of buckets are balanced

Centre of gravity falls within the body

Centre of gravity and centre of equilibrium fall within the feet

Resultant weight of buckets is zero

53 / 100

53. Which results in an increase in power?

Doing more work in less time.

Doing less work in more time.

Doing less work in less time.

Doing more work in more time.

54 / 100

54. A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously ?

They must have the same volume

They must have the same density

They must have the same mass

They must be dropped in vacuum

55 / 100

55. The dimension MLT^–2 corresponds to

Force

Work done

Acceleration

Velocity

56 / 100

56. If lift is going up with acceleration, the apparent weight of a body is

May be more or less than true weight

More than the true weight

Less than the true weight

Equal to the true weight

57 / 100

57. When a pail of water is swung in a vertical circle, the water does not fall out at the top of the loop when the speed is

Below a certain minimum value irrespective of amount of water in the pail

Above a certain minimum value irrespective of amount of water in the pail

Above a certain minimum value depending on amount of water in the pail

Below a certain minimum value depending on amount of water in the pail

58 / 100

58. If a person moves a trolley for a distance of 10 m with a force of 50 N, then the work done is

0.2 J

5 J

20 J

500 J

59 / 100

59. Necessary element of change in solar energy to electrical energy

Berillium

Silicon

Tantelum

Pure Copper

60 / 100

60. A rubber ball is dropped from a height of 2 metres. To what height will it rise if there is no loss of energy/velocity after rebounding ?

4 metres

3 metres

2 metres

1 metre

61 / 100

61. Angle of friction and angle of repose are

Equal to each other

Not equal to each other

Proportional to each other

None of these

62 / 100

62. A boy is swinging a ball attached to a string in a horizontal circle. If the string snaps

The ball will travel towards the center of the circle and fall down

It will continue to travel along a tangent to the circle at the point the ball was at the time of snapping and finally fall down

It will fall down at the same place where the string breaks

None of these

63 / 100

63. In case of uniform circular motion, the acceleration is

Variable in magnitude but constant in direction

Constant in magnitude and directed radially inwards

Variable in magnitude but tangential to the circle

Zerob

64 / 100

64. A 4 kg object is moving horizontally with a speed of 5 m/s. To increase its speed to 10 m/s, the amount of net work required to be done on this object is:

150 J

100 J

50 J

75 J

65 / 100

65. A dynamo is used to convert

Mechanical energy into electrical energy

Electrical energy into mechanical energy

Electrical energy into magnetic energy

Magnetic energy into mechanical energy

66 / 100

66. The force that keeps a body in a circular motion called

The centripetal force

The centrifugual force

The frictional force

All of these

67 / 100

67. The minimum number of forces to keep a particle in equilibrium is

68 / 100

68. A body of 4.0 kg is lying at rest. Under the action of a constant force, it gains a speed of 5 m/s. The work done by the force will be ________

50 J

30 J

20 J

40 J

69 / 100

69. What device converts light energy to electrical energy?

Photodiode

Photovoltaic cell

Thermocouple

Heliostats

70 / 100

70. Which one of the following is applicable to collision-coalescence process of precipitation?

Clouds which do not extend beyond the freezing level

Clouds which extend beyond the freezing level

All types of clouds

Cirrocumulus cloud

71 / 100

71. A body of mass 2 kg is thrown upward with initial velocity of 20 m/s. After 2 seconds, its kinetic energy will be : (g = 10 m/s²)

0 J

200 J

400 J

100 J

72 / 100

72. The force that generates wind is

Gravity force

Pressure gradient force

Coriolis force

Centrifugal force

73 / 100

73. A hunter on the ground wishes to shoot a bird on a tree at a distance with his rifle. He has to point the rifle

At the lower elevation than the bird

At a higher elevation than the bird

In the same direction as the bird

Vertically upwards

74 / 100

74. Rain drops fall from great height. Which among the following statements is true regarding it?

They fall with that ultimate velocity, which are different for different droplets

They fall with same ultimate velocity

Their velocity increases and they fall with different velocity on the earth

Their velocity increases and they fall with same velocity on the earth

75 / 100

75. If an object is thrown upwards, what will be its velocity, when it reaches its maximum height?

0 m/s

4.9 m/s

14.7 m/s

20 m/s

76 / 100

76. Centrifugal force increases with

Temperature

Pressure

Acceleration

Humidity

77 / 100

77. What is the SI unit of Power?

Boyle

Watt

Newton

Pascal

78 / 100

78. Dynamo is a device for converting

Heat energy into electrical energy

Mechanical energy into electrical energy

Magnetic energy into electrical energy

Chemical energy into electrical energy

79 / 100

79. A ball is thrown vertically upward from the ground. It crosses a point at the height of 25 m twice at an interval of 4 seconds. The ball was thrown with the velocity of

18 m/s

25 m/s

30 m/s

36 m/s

80 / 100

80. A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the body is: [Given g = 9.8 m/s²]

1568 J

1568 C

1568 W

1568 N

81 / 100

81. When an unbalanced force acts on an object

Causes change in motion of the object

The speed & direction of the object will change

Causes the object to move

All of these

82 / 100

82. Kinetic energy depends on

The velocity or speed of the moving body.

The mass of the moving body

The pressure of the moving body

Both mass and velocity of the moving body

83 / 100

83. The working of a rocket is based on the principle of:

Conservation of momentum

Conservation of mass

Conservation of energy

Conservation of angular momentum

84 / 100

84. A dynamo is a device which

Creates mechanical energy

Creates electrical energy

Converts mechanical energy into electrical energy

Converts electrical energy into mechanical energy

85 / 100

85. A bullet of mass 10gm is fired with a velocity of 40 m/s from a gun of mass 8 kg. Find the recoil velocity (in m/s) of the gun.

0.1

0.05

86 / 100

86. When the milk is churned vigorously the cream from it is separated out due to

Centripetal force

Gravitational force

Frictional force

Centrifugal force

87 / 100

87. An object covers distance which is directly proportional to the square of the time. Its accelaration is

Increasing

Decreasing

Zero

Constant

88 / 100

88. An object covers distance which is directly proportional to the square of the time. Its accelaration is

Increasing

Decreasing

Zero

Constant

89 / 100

89. Solar energy is converted into chemical energy during

Transpiration

Photosynthesis

Diffusion

Osmosis

90 / 100

90. The work done by the string of a simple pendulum during one complete oscillation is equal to

Total energy of the pendulum

Kinetic energy of the pendulum

Potential energy of the pendulum

Zero

91 / 100

91. If an electron and a photon have the same wavelength, then they will have the same

Velocity

Linear momentum

Angular momentum

Energy

92 / 100

92. For a freely falling body, the sum of kinetic energy and potential energy is always

Zero

Unity

Same

Variable

93 / 100

93. A person lifts luggage of 20 kg from the ground and puts it on his head 2m above the ground. Calculate the work done by him. (g = 10 )

20 J

400J

200J

40J

94 / 100

94. The angle in which a cricket ball should be hit to travel maximum horizontal distance is :

60° with horizontal

45° with horizontal

30° with horizontal

15° with horizontal

95 / 100

95. A man stands on the pan of a balance holding a fish in his right hand and bucket of water in his left hand. If he transfers the fish into the bucket, the total weight on the pan

Increases

Decreases

Remains the same

First increases and then decreases

96 / 100

96. Gasoline is useful in cars because it has

Chemical potential energy

Electrical potential energy

Gravitational potential energy

Kinetic energy

97 / 100

97. The dimension of which of the following is the same as that of impulse ?

Volume

Momentum

Torque

Change in the rate of momentum

98 / 100

98. A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?

Both the spheres will reach the ground simultaneously.

A will reach the ground first.

B will reach the ground first.

The question is incomplete because the masses of the spheres are not given.

99 / 100

99. The quantity that is not conserved in an inelastic collision is

Momentum

Kinetic Energy

Total Energy

All of these

100 / 100

100. The dimension of which of the following is the same as that of impulse ?

Volume

Momentum

Torque

Change in the rate of momentum

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