Laws of Motion MCQ Practice Test – NEET Physics (Free)

A body of mass 3 kg hits a wall with a speed of 10 m s⁻¹ at an angle of 60° with the wall and rebounds with the same speed at the same angle, as shown.
r_wall_60

The impact time is 0.2 s. The average force exerted on the wall is

\( 150\sqrt{3} \) N
\( 50\sqrt{3} \) N
\( 75\sqrt{3} \) N
100 N

A block of mass 2 kg on a rough horizontal surface (μ = 0.25) is pulled by a force of 10 N at 37° above the horizontal. Its acceleration is (g = 10 m s⁻², sin37° = 0.6)

4 m s⁻²
2.25 m s⁻²
3.25 m s⁻²
1.5 m s⁻²

A force acts on a body of mass 5 kg and changes its velocity from 2 m s⁻¹ to 8 m s⁻¹ in 3 s. The force is

6 N
10 N
50 N
30 N

A passenger standing in a bus falls backwards when the bus suddenly starts. This is due to

inertia of direction
inertia of motion
inertia of rest
the third law of motion

A helicopter of mass 1000 kg carrying crew and passengers of mass 300 kg rises with a vertical acceleration of 15 m s⁻². The action of the rotor of the helicopter on the surrounding air is (g = 10 m s⁻²) (NCERT)

32500 N downwards
32500 N upwards
13000 N downwards
25000 N downwards

A block takes time t to slide down a smooth incline and time 3t to slide down the same incline when it is rough. If the incline angle is 45°, the coefficient of kinetic friction is

\( \dfrac{1}{3} \)
\( \dfrac{2}{3} \)
\( \dfrac{8}{9} \)
\( \dfrac{1}{9} \)

The maximum speed at which a car can go round a level curve of radius r is v. On a curve of radius 4r with the same road surface, the maximum speed is

\( \dfrac{v}{2} \)
v
4v
2v

A string over a fixed pulley connects masses m and 3m. The force on the pulley support (pulley and string light) when they move is

6mg
4mg
2mg
3mg

The minimum force needed to move a block of weight W on a rough horizontal surface (coefficient of friction μ), applied at the best angle, is

\( \mu W \)
\( \dfrac{\mu W}{\sqrt{1 + \mu^2}} \)
\( \dfrac{W}{\sqrt{1 + \mu^2}} \)
\( \mu W\sqrt{1 + \mu^2} \)

The position of a 2 kg particle is x = 3t² m, where t is in seconds. The force acting on it is

6 N
12 N
24 N
3 N

Roads are banked on curves so that

a component of the normal force provides the centripetal force
the weight of the vehicle is reduced
the vehicle can move faster on straight roads
friction is increased

The force of friction always acts

opposite to the relative motion (or tendency of relative motion) between surfaces
in the direction of motion
towards the centre of the earth
perpendicular to the surface

A body of mass 2 kg moves under a force that varies as F = (20 − 4t) N, starting from rest. The maximum speed attained is

100 m s⁻¹
50 m s⁻¹
12.5 m s⁻¹
25 m s⁻¹

A 5000 kg rocket is set for vertical firing. The exhaust speed is 800 m s⁻¹. To give an initial upward acceleration of 20 m s⁻², the amount of gas ejected per second to supply the needed thrust is (g = 10 m s⁻²)

185.5 kg s⁻¹
127.5 kg s⁻¹
137.5 kg s⁻¹
187.5 kg s⁻¹

A 40 kg slab rests on a frictionless floor and a 10 kg block rests on it. The coefficients of static and kinetic friction between block and slab are 0.6 and 0.4. A horizontal force of 100 N acts on the block. The acceleration of the block is (g = 10 m s⁻²)

10 m s⁻²
1 m s⁻²
4 m s⁻²
6 m s⁻²

Submit Test?

Just a moment...

Scorecard