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NEET • PHYSICS • LAWS OF MOTION

Laws of motion practice · Easy

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Showing 61-70 of 70 questions

61 Easy

61 of 70

Application +4 | -1

A 50g bullet moving with a velocity of

10\mathrm{\;m}{\mathrm{s}^{ - 1}}

gets embeded into a 950g stationary body. The loss in KE of the system will be

View answer and explanation

Correct option: A

95\%

Option A is correct because most of the kinetic energy is lost in the inelastic collision as the bullet embeds itself into the body.

62 Easy

62 of 70

Analyzing +4 | -1

If a coin is dropped in a lift it takes

t_1

time to reach the floor and takes

t_2

time when lift is moving up with constant acceleration, then which one of the following relation is correct?

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Correct option: B

t_1>t_2

Option B (

t_1>t_2

) is correct because when the lift is moving upwards with constant acceleration, the effective acceleration due to gravity increases, causing the coin to reach the floor faster.

63 Easy

63 of 70

Understanding +4 | -1

Statement I: Improper banking of roads causes wear and tear of tyres.
Statement II: The necessary centripetal force in that event is provided by friction between the tyres and roads.

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Correct option: A

Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I

Option A (Statement I is true, Statement II is true; Statement II is the correct explanation for Statement I) is correct because improper banking leads to reliance on friction, causing wear and tear.

64 Easy

64 of 70

Application +4 | -1

A constant horizontal force of 20 N acts on a body on a smooth horizontal plane. The body starts from rest and is observed to move 20 m in two seconds. The mass of the body is

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Correct option: B

2 kg

Option A (4 kg) is incorrect. The correct answer is 2 kg. Using kinematics, we find the acceleration, and then using Newton's second law, we solve for the mass.

65 Easy

65 of 70

Analyzing +4 | -1

An electric fan is placed on a stationary boat
and air is blown with it on the sail of the boat.
Which of the following statements is correct?

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Correct option: D

The boat will remain stationary as before

Option D (The boat will remain stationary as before) is correct because the force exerted by the fan on the sail is an internal force, and there is no net external force acting on the boat-fan system.

66 Easy

66 of 70

Application +4 | -1

A rocket with a lift-off mass

3.5 \times 10^4 \mathrm{~kg}

is blast upward with an initial acceleration of

10 \mathrm{~ms}^{-2}

. Then, the initial thrust of the blast is

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Correct option: C

7 \times 10^5 \mathrm{~N}

Option C (

7 \times 10^5 \mathrm{~N}

) is correct because it is the thrust required to overcome gravity and provide the given upward acceleration.

67 Easy

67 of 70

Understanding +4 | -1

You are pushing a wooden crate across the floor at a constant speed. You decide to change the orientation of crate such that area of contact with floor become half. In the new orientation, to push the same crate across the same floor with the same constant speed, the force that you apply must be about as the force required before you changed the crate's orientation.

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Correct option: C

Equally great

Option C (Equally great) is correct because the force of friction depends on the normal force and the coefficient of friction, neither of which changes when the orientation of the crate is changed.

68 Easy

68 of 70

Analyzing +4 | -1

Choose the wrong statement

View answer and explanation

Correct option: C

If the speed of a particle is constant, its acceleration must be zero

Option C (If the speed of a particle is constant, its acceleration must be zero) is correct because constant speed does not imply zero acceleration if the direction is changing (e.g., uniform circular motion).

69 Easy

69 of 70

Application +4 | -1

A machine gun fires a bullet of mass 46 g with a velocity 1050 m/s. The man holding it can exert a maximum force 144 N on the gun. How many bullets can he fire per second at the most?

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Correct option: B

The correct answer is 3 because the maximum number of bullets fired per second is determined by the maximum force the man can exert divided by the force exerted by each bullet.

70 Easy

70 of 70

Application +4 | -1

On the horizontal surface of a truck

\left( {\mu = 0.6} \right)

, a block of mass 1 kg is placed. If the truck is accelerating at the rate of

5m/se{c^2}

then frictional force on the block will be

View answer and explanation

Correct option: A

5 N

Option A (5 N) is correct because the frictional force is equal to the product of the mass and the acceleration of the truck, as long as this value is less than the maximum static friction.

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