NEET Foundation Physics Multiple Choice Questions

Physics Check Your Understanding

Question 1. Which of the following is different from others?

1. Wavelength
2. Velocity
3. Frequency
4. Amplitude

Answer. 4. Amplitude

Question 2. If a force of 250 N acts on a body, the momentum acquired is 125 kgms^-1, what is the period for which force acts on the body?

1. 0.5s
2. 0.2s
3. 0.4s
4. 0.25 s
5. 125 × 250 s

Answer. 1. 0.5s

Question 3. The escape velocity on the surface of the earth is 11.2 kms^-1. If mass and radius of a planet is 4 and 2 times respectively than that of earth, what is escape velocity from the planet?

1. 11.2kms^-1
2. 1.112kms^-1
3. 15.8kms^-1
4. 22.4kms^-1
5. None of these

Answer. 5. None of these

Question 4. Which is constant for a satellite in an orbit?

1. Velocity
2. Kinetic energy
3. Angular momentum
4. Potential energy
5. Acceleration

Answer. 4. Acceleration

Question 5. A boy walks to his school at a distance of 6 km with a speed of 2.5kmh^-1 and walks back with a constant speed of 4 kmh^-1. His average speed for round trip expressed in kmh^-1 is

1. 24/13
2. 40/13
3. 3
4. 4.8

Answer. 1. 24/13

Question 6. A particle of mass 0.1kg is subjected to a force which varies with distance as shown below. If it starts its journey from rest at x = 0, its velocity at x = 12m is

1. 0ms^-1.
2. 20 √2 ms^-1 .
3. 20 √3 ms^-1 .
4. 40ms^-1.

Answer. 3. 20√3ms^-1 .

Question 7. A particle reaches its highest point when it has covered exactly one half of its horizontal range. The corresponding point on the displacement time graph is characterized by

1. negative slope and zero curvature
2. zero slope and negative curvature
3. zero slope and positive curvature
4. positive slope and zero curvature

Answer. 2. zero slope and negative curvature

Question 8. A ball thrown upward with a velocity of 100 ms^-1. It will reach the ground after

1. 10s
2. 20s
3. 5s
4. 40s

Answer. 1. 10s

Question 9. Which of the following quantity is expressed as force per unit area?

1. Work
2. Pressure
3. Volume
4. Area

Answer. 1. Work

Question 10. A bullet of mass 0.1kg is fired with a speed of 100ms^-1, the mass of gun is 50kg. The velocity of recoil is

1. 0.2ms^-1.
2. 0.1ms^-1.
3. 0.5ms^-1.
4. 0.05ms^-1.

Answer. 3. 0.5ms^-1.

Question 11. A body of mass 2kg moving with a velocity of 3ms^-1collides head on with a body of mass 1 kg moving with a velocity of 4 ms^-1 in the opposite direction. After collision the two bodies stick together and move with common velocity which in the units ms^-1 is equal to

1. 1/4
2. 1/3
3. 2/3
4. 3/4

Answer. 2. 1/3

Question 12. In a satellite if the time of revolution is T, then KE is proportional to

1. \(\frac{1}{T}\)
2. \(\frac{1}{T^2}\)
3. \(\frac{1}{T^3}\)
4. \(T^{-\frac{2}{3}}\)

Answer. 3. \(\frac{1}{T^3}\)

Question 13. The initial velocity of a particle is u(at² = 0) and the acceleration f is given by a.t. Which of the following relations is valid?

1. v = u + at²
2. v = u + 1/2 at²
3. v = u + at
4. v = u

Answer. 3. v = u + at

Question 14. Which of the following four statements is false?

1. A body can have zero velocity and still be accelerated.
2. A body can have a constant velocity and still have a varying speed.
3. A body can have a constant speed and still have a varying velocity.
4. The direction of the velocity of a body can change when its acceleration is constant.

Answer. 2. A body can have a constant velocity and still have a varying speed.

Question 15. When a bicycle is in motion but not pedalled, the force of friction exerted by the ground on the two wheels is such that it acts

1. in the backward direction on the front wheel and in the forward direction on the rear wheel
2. in the forward direction on the front wheel and in the backward direction on the rear wheel
3. in the forward direction on both the wheels
4. in the backward direction on both the wheels

Answer. 3. in the forward direction on both the wheels

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Question 16. A body dropped from a height h with an initial speed zero, strikes the ground with a velocity 3 kmh¹. Another body of same mass is dropped from the same height ‘h’ with an initial speed u’ = 4 kmh^-1. Find the final velocity of second body, with which it strikes the ground.

1. 3kmh^-1
2. 4kmh^-1
3. 5kmh^-1
4. 12kmh^-1

Answer. 3. 5kmh^-1

Question 17. If the increase in the kinetic energy of a body is 22%, then the increase in the momentum is nearly

1. 22%
2. 44%
3. 10%
4. 300%

Answer. 3. 10%

Question 18. A car moves for half of its time at 80 kmh^-1 and for rest half of time at 40 kmh^-1. The total distance covered is 60 km. What is the average speed of the car?

1. 60 kmh^-1
2. 80 kmh^-1
3. 120 kmh^-1
4. 180 kmh^-1

Answer. 1. 60 kmh^-1

Question 19. The engine of a car produces acceleration 4 ms^-2 in the car. If this car pulls another car of same mass, what will of the acceleration produced?

1. 8ms^-2
2. 2ms^-2
3. 4ms^-2
4. 1/2 ms^-2

Answer. 4. 1/2 ms^-2

Question 20. Two bodies of 4g and 16g have same kinetic energy. What is the ratio of their momenta?

1. 1:4
2. 1:2
3. 2:1
4. 4:1

Answer. 1. 1:4

Question 21. A motor car is moving with speed 30ms^-1 on a circular path of radius 500m. Its speed is increasing at the rate of 2ms^-2, what will be its resultant acceleration?

1. 2.5ms^-2
2. 2.7ms^-2
3. 2ms^-2
4. 4.5ms^-2

Answer. 3. 2ms^-2

Question 22. The distance of the centres of moon and earth is D. The mass of earth is 81 times the mass of the moon. At what distance from the centre of the earth, the gravitational force will be zero?

1. \(\frac{D}{2}\)
2. \(\frac{2 D}{3}\)
3. \(\frac{4 D}{3}\)
4. \(\frac{9 D}{10}\)

Answer. 4. \(\frac{9 D}{10}\)

Question 23. A ball of mass m moving with a constant velocity strikes against a ball of same mass at rest. If e = coefficient of restitution, then what will be the ratio of the velocity of two balls after the collision?

1. \(\frac{1-e}{1+e}\)
2. \(\frac{e-1}{e+1}\)
3. \(\frac{1+e}{1-e}\)
4. \(\frac{2+1}{e-1}\)

Answer. 1. \(\frac{1-e}{1+e}\)

Question 24. An inelastic ball is dropped from a height of 100m. Due to earth, 20% of its energy is lost. To what height the ball will rise?

1. 80 m
2. 40 m
3. 60 m
4. 20 m

Answer. 1. 80 m

Question 25. What remains constant when the earth revolves around the sun?

1. Angular momentum
2. Linear momentum
3. Angular kinetic energy
4. Linear kinetic energy

Answer. 3. Angular kinetic energy

Question 26. Where will it be profitable to purchase 1 kilogram sugar?

1. At poles
2. At equator
3. At 45° latitude
4. At 40° latitude

Answer. 1. At poles

Question 27. What remains constant in the field of central force?

1. Potential energy
2. Kinetic energy
3. Angular momentum
4. Linear momentum

Answer. 3. Angular momentum

Question 28. A body is rolling without slipping on a horizontal surface and its rotational kinetic energy is equal to the translational kinetic energy. The body is a

1. disc
2. sphere
3. cylinder
4. ring.

Answer. 3. cylinder

Question 29. If a body of mass 200 g falls from a height 200m and its total potential energy is converted into kinetic energy at the point of contact of the body with earth surface, then what is the decrease in potential energy of the body at the contact? (Take g = 10ms^-2)

1. 200J
2. 400J
3. 600J
4. 900J

Answer. 4. 900J

Question 30. If momentum is increased by 20%, then kinetic energy increases by

1. 44%
2. 55%
3. 66%
4. 77%

Answer. 1. 44%

Question 31. Who among the following gave first the experimental value of G?

1. Cavendish
2. Copernicus
3. Brook Teylor
4. None of these

Answer. 1. Cavendish

Question 32. If a body starts from rest and travels 120cm in the 6th second then what is the acceleration?

1. 0.20ms^-2
2. 0.027ms^-2
3. 0.218ms^-2
4. 0.03ms^-2

Answer. 2. 0.027ms^-2

Question 33. There are two bodies of masses 100 kg and 10,000 kg separated by a distance 1 m. At what distance from the smaller body, the intensity of gravitational field will be zero?

1. 1/9m
2. 1/10m
3. 1/11m
4. 10/11m

Answer. 3. 1/11m

Question 34. If the radius of the earth shrinks by 1.5% (mass remaining same), then the value of acceleration due to gravity changes by

1. 1%
2. 2%
3. 3%
4. 4%

Answer. 2. 2%

Question 35. Adjacent figure belows shows the force displacement the graph of a moving body. The work done in displacing body from x = 0 m to x = 35m is equal to

1. 50J
2. 25J
3. 250J
4. 200J

Answer. 1. 50J

Question 36. A solid of relative density D is floating in a liquid of density d. If v be the volume of solid submerged in the liquid and V be the total volume of the solid, then

1. uV = dD
2. \(\frac{V}{v}=\frac{D}{d}\)
3. \(\frac{v}{V}=\frac{D}{d}\)
4. DV = (1+d)v

Answer. 3. \(\frac{v}{V}=\frac{D}{d}\)

Question 37. A ball of mass m₁ and an another ball of mass m₂ are dropped from equal height. If time taken by the ball are t₁ and t₂, respectively then

1. \(t_1=\frac{t_2}{2}\)
2. t₁ = t₂
3. t₁ = 4t₂
4. \(t_1=\frac{t_2}{4}\)

Answer. 1. \(t_1=\frac{t_2}{2}\)

Question 38. A person is observing two trains; one is approaching him with a velocity of 4 ms^-1, while the other is receding from him with the same velocity. If both the trains blow their respective whistles of frequency 240 hertz, the beat frequency heard by the observer will be (speed of sound in air = 320ms^-1)

1. 6
2. 3
3. zero
4. 12

Answer. 1. 6

Question 39. One siren which is giving a sound of frequency 1000Hz, is going away from a stationary observer towards a wall with the speed of 10 ms^-1. What is the frequency of sound heard directly from the siren? Speed of sound in air is 330ms^-1?

1. 970Hz
2. 971Hz
3. 972Hz
4. 975Hz

Answer. 2. 971Hz

Question 40. In which medium sound travels faster?

1. Steel
2. Water
3. Air
4. Vacuum

Answer. 1. Steel

Question 41. Two sound waves of slightly different frequencies propagating in the same direction produce beats due to

1. interference
2. diffraction
3. polarization
4. refraction

Answer. 1. interference

Question 42. The frequency of a sound wave is f and its velocity is v. If the frequency is increased to 4f, the velocity of the wave will be

1. v
2. 2v
3. 4v
4. v/4

Answer. 1. v

Question 43. A source of sound of frequency 500Hz is moving towards an observer with velocity 30ms^-1. The speed of sound is 330ms^-1. The frequency heard by the observer will be

1. 550Hz
2. 458.3Hz
3. 530Hz
4. 454.5Hz

Answer. 1. 550Hz

Question 44. Two sound sources emit sound of wavelength l. They are fixed apart at a given distance. A listener moves with a velocity u along the line joining the two sources. The number of beats heard by him per second is

1. \(\frac{u}{2 \lambda}\)
2. \(\frac{2 u}{\lambda}\)
3. \(\frac{u}{\lambda}\)
4. \(\frac{u}{3 \lambda}\)

Answer. 2. \(\frac{2 u}{\lambda}\)

Question 45. A man is standing between two parallel cliffs and fires a gun. If he hears first and second echos after 1.5 s and 3.5 s respectively, the distance between the cliffs is (velocity of sound in air = 340ms^-1)

1. 1190m
2. 850m
3. 595m
4. 510m

Answer. 2. 850m

Question 46. Ultrasonic signals sent from SONAR returns to it after reflection from a rock after a lapse of 1 s. If the velocity of ultrasound in water is 1,600ms^-1, the depth of the rock in water is

1. 300m
2. 400m
3. 500m
4. 800m

Answer. 4. 800m

Question 47. Sound waves in air is always

1. longitudinal
2. transverse
3. stationary
4. electromagnetic

Answer. 1. longitudinal

Question 48. Rutherford’s ∝ scattering particle concludes that

1. there is a heavy mass at centre
2. electrons are revolving around the nucleus
3. Both (a) and (b)
4. None of these

Answer. 1. there is a heavy mass at centre

Question 49. A heavenly body that emits radio signals at regular intervals of time is called a

1. quasar
2. white dwarf
3. red giant
4. pulsar

Answer. 4. pulsar

Question 50. A large ship can float but a steel needle sinks because of

1. viscosity
2. surface tension
3. density
4. None of these

Answer. 4. None of these

Question 51. A moving body on earth ordinarily comes to rest by itself because of the

1. law of inertia
2. forces of friction
3. conservation of momentum
4. gravity

Answer. 2. forces of friction

Question 52. A person climbing a hill bends forward in order to

1. avoid slipping
2. increase speed
3. reduce fatigue
4. increase stability

Answer. 4. increase stability

Question 53. A piece of rock was brought from the moon to earth. Then

1. its mass alone changed
2. its weight alone changed
3. both mass and weight changed
4. neither its mass nor its weight changed

Answer. 2. its weight alone changed

Question 54. A red light is used in a traffic signal because

1. it has the longest wavelength and can be easily noticed from a long distance
2. it is beautiful
3. it is visible even to people with bad eyesight
4. None of these

Answer. 1. it has the longest wavelength and can be easily noticed from a long distance

Question 55. A shell, initially at rest suddenly explodes into two equal fragments A and B. Which one of the following is observed?

1. A and B move in the same direction with the same speed.
2. A and B move in the same direction with different speeds.
3. A and B move in opposite directions with the same speed.
4. A and B move in opposite directions with different speeds.

Answer. 3. A and B move in opposite directions with the same speed.

Question 56. A shooting star is

1. a small star moving away from the earth at a very high speed
2. a fast moving satellite that shines by sunlight
3. a heavenly object that shines because it is heated by the friction of the earth’s atmosphere as it falls at a great speed
4. a star of an extremely high density

Answer. 2. a fast moving satellite that shines by sunlight

Question 57. A shooting star is basically a

1. meteor
2. supernova
3. comet trail
4. disturbance in atmosphere

Answer. 1. meteor

Question 58. A sprayer works on the principle expounded by

1. Newton
2. Archimedes
3. Boyle
4. Pascal

Answer. 4. Pascal

Question 59. A tennis ball will bounce

1. higher on the hills than on plains
2. higher on the plains than on hills
3. equally on the hills and plains
4. higher either on the hills or on plains depending upon the ground friction

Answer. 1. higher on the hills than on plains

Question 60. A unit of energy is the same as that of

1. work
2. power
3. force
4. acceleration

Answer. 1. work

Question 61. An electric bulb produces a loud sound when broken because

1. the air rushes into the partial vacuum in the bulb
2. the gas inside it explodes
3. the glass is brittle
4. the gas inside it suddenly expands

Answer. 1. the air rushes into the partial vacuum in the bulb

Question 62. An iron hammer lying in the sun appears much hotter than its wooden handle because

1. iron is at a higher temperature
2. iron is darker than wood
3. iron absorbs more heat
4. iron is a good conductor of heat

Answer. 4. iron is a good conductor of heat

Question 63. An object moving around in a circle is moving with a

1. uniform velocity
2. uniform speed
3. variable velocity
4. variable speed

Answer. 3. variable velocity

Question 64. As the train starts moving, a man sitting inside leans backwards because of

1. inertia of rest
2. inertia of motion
3. moment of inertia
4. conservation of mass

Answer. 1. inertia of rest

Question 65. By what process heat transmitted from the filament of an evacuated electric bulb to the glass?

1. Conduction
2. Convection
3. Radiation
4. Heat cannot be transmitted through a vacuum

Answer. 3. Radiation

Question 66. Cathode rays were discovered by

1. Rutherford
2. J J Thomson
3. Lord Kelvin
4. Dirac

Answer. 2. J J Thomson

Question 67. Choose the only scalar quantity from the following:

1. Energy
2. Torque
3. Momentum
4. Force

Answer. 1. Energy

Question 68. Choose the only vector quantity from the following:

1. Energy
2. Length
3. Density
4. Torque

Answer. 4. Torque

Question 69. Clouds float in the atmosphere because of their low

1. temperature
2. speed
3. pressure
4. density

Answer. 4. density

Question 70. Cloudy nights are warmer because

1. clouds prevent radiation of heat from the ground into the air
2. of low atmospheric pressure
3. of the compact density of air
4. more dust particles gather in the air

Answer. 1. clouds prevent radiation of heat from the ground into the air

Question 71. Energy is not carried by

1. transverse progressive waves
2. longitudinal progressive waves
3. stationary waves
4. electromagnetic waves

Answer. 3. stationary waves

Question 72. Gravitational constant (G) is an example of

1. non-dimensional constant
2. dimensional constant
3. numeric constant
4. quantity without dimensions

Answer. 2. dimensional constant

Question 73. If a shell from a canon bursts in the air, the total kinetic energy

1. increases
2. decreases
3. remains constant
4. may increase or decrease

Answer. 1. increases

Question 74. If a train were to move with the velocity of light, its length would be

1. infinite
2. zero
3. finite
4. unchanged

Answer. 2. zero

Question 75. If the distance between two charges is halved, then the force between them becomes

1. half
2. double
3. four times
4. one-fourth

Answer. 3. four times

Question 76. Intensity of sound has

1. an objective existence
2. a subjective existence
3. no existence
4. both subjective and objective existence

Answer. 1. an objective existence

Question 77. Sound of frequency below 20 Hz are called

1. audio sounds
2. infrasonics
3. ultrasonics
4. supersonics

Answer. 2. infrasonics

Question 78. Sound travels fastest in

1. air
2. water
3. vacuum
4. steel

Answer. 2. water

Question 79. Sound travels fastest through

1. vacuum
2. steel
3. water
4. air

Answer. 2. steel

Question 80. Sound waves in air are

1. transverse
2. longitudinal
3. electromagnetic
4. polarized

Answer. 2. longitudinal