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NEET Physics : Laws of Motion

Multiple Choice Questions

71.

A body weighing 8 g when placed in one pan and 18 g when placed on the other pan of a false balance. If the beam is horizontal when both the pans are empty, then the true weight of the body is

13 g
9 g
22 g
12 g

72.

A moving body of mass m and velocity 3 km/h collides with a rest body ofmass 2 m and stick to it. Now the combined mass starts to move. What will be the combined velocity?

4 km/h
1 km/h
2 km/h
3 km/h

73.

A block B is pushed momentarily along a horizontal surface with an initial velocity v. If is the coefficient of vlicling friction between B and the surface, block B will come to rest after a time

$\frac{v}{g μ}$
$\frac{g μ}{v}$
$\frac{g}{v}$
$\frac{v}{g}$

74.

A ball of mass m hits the floor with a speed v making an angle of incidence θ with the normal. The coefficient of restitution is e. The speed of reflected ball and the angle of reflection of the ball will be

v' = v, θ = θ'
v' = $\frac{v}{2}$ , θ = 2θ'
v' = 2v, θ = 2θ'
v' = $\frac{3 v}{2}, θ = \frac{2 θ'}{3}$

75.

A particle slides on surface of a fixed smooth sphere starting from top most point. The angle rotated by the radius through the particle, when it leaves contact with the sphere, is

$θ = \cos^{- 1} \frac{1}{3}$
$θ = \cos^{- 1} (\frac{2}{3})$
$θ = \tan^{- 1} (\frac{1}{3})$
$θ = \sin^{- 1} \frac{4}{3}$

76.

A car of mass 1000 kg moves on a circular track of radius 40 m. If the coefficient of friction is 1.28. The maximum velocity with which the car can be moved, is

22.4 m/s
112 m/s
$\frac{0.64 \times 40}{1000 \times 100}$ m/s
1000 m/s

77.

A block slides down on an incline of angle 30° with an acceleration g/4 . Find the kinetic 4 friction coefficient.

1 / 2√2
0.6
1 / 2√3
1 / √2

78.

A monkey of mass 15 kg is climbing on a rope with one end fixed to the ceiling. If it wishes to go up with an acceleration 1 m/s, how much force should it apply to the rope if rope is 5 m long and the monkey starts from rest?

150 N
> 160 N
165 N
150 < T ≤ 160 N

79.

A pendulum having a bob of mass m is hanging in a ship sailing along the equator form east to west. When the strip is stationary with respect to water, the tension in the string is T₀, The difference between T₀ and
earth attraction on the bob, is

$\frac{mg + m ω^{2} R}{2}$
$\frac{{mω}^{2} R}{3}$
$\frac{{mω}^{2} R}{2}$
mω² R

80.

Universal time is based on

rotational effect of the earth about its axis
vibrations of cesium atom
orbital motion of the earth around the sun
oscillation of quartz crystal

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NEET Physics : Laws of Motion

Multiple Choice Questions