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NEET Physics : Motion in A Plane

Multiple Choice Questions

101.

A passenger train is moving at 5 ms^-1 .An express train is travelling at 30 ms^-1, on the same track and rear side of the passenger train at some distance. The driver in express train applied brakes to avoid collision. If the retardation due to brakes is 4 ms^-2 , the time in which the accident is avoided after the application of brakes is

4.25 s
5.25 s
6.25 s
7.25 s

102.

A particle of mass m is projected with velocity v making an angle of 45° with the horizontal. When the particle lands on the level ground, the magnitude of the change in momentum is

$\sqrt{2} mv$ along -ve y-direction
$\sqrt{2} mv$ along +ve y-direction
$2 \sqrt{2} mv$ along -ve y-direction
$2 \sqrt{2} mv$ along +ve y-direction

103.

The magnitude of a vector, on the addition of two vectors $6 \overset{\land}{i} + 7 \overset{\land}{j} and 3 \overset{\land}{i} + 4 \overset{\land}{j}$ is

$\sqrt{132}$
$\sqrt{136}$
$\sqrt{160}$
$\sqrt{202}$

104.

The acceleration experienced by a moving boat after its engine is cut off, is given by a = − kv³, where k is a constant. If v₀ is the magnitude of velocity at cut off, then the magnitude of the velocity at time t after the cut off is

$\frac{v_{0}}{2 {ktv}_{0}^{2}}$
$\frac{v_{0}}{1 + 2 {ktv}_{0}^{2}}$
$\frac{v_{0}}{\sqrt{1 - 2 {kv}_{0}^{2}}}$
$\frac{v_{0}}{\sqrt{1 + 2 {ktv}_{0}^{2}}}$

105.

An object is projected at an angle of 45° with the horizontal. The horizontal range and maximum height reached will be in the ratio

1 : 2
2 : 1
1 : 4
4 : 1

106.

A particle is projected upwards from the surface of the earth (of radius R) with a KE equal to half the minimum value needed for it to escape. To what height (h) does it rise above the surface of the earth

R
2R
$\frac{R}{2}$
(R)^1/2

107.

An aeroplane is flying horizontally with a velocity of 600 km/h and at a height of 1960 m. When it is vertically above a point A on the ground a bomb is released from it. The bomb strikes the ground at point B. The distance AB is

1200 m
0.33 km
333.3 km
3.33 km

108.

A body starting from rest moves with constant acceleration. The ratio of distance covered by the body during the 5th second to that covered in 5 s is

$\frac{9}{25}$
$\frac{3}{5}$
$\frac{25}{5}$
$\frac{1}{25}$

109.

The magnitude of vectors A, B and C are 3, 4 and 5 units respectively. If A + B =C, then the angle between A and B is

$\frac{π}{2}$
cos^-1 0.6
tan^-1 $\frac{7}{5}$
$\frac{π}{4}$

110.

A 10 kg object collides with stationary 5 kg object and after collision they stick together and move forward with velocity 4 ms^-1. What is the velocity with which the 10 kg object hit the second one ?

4 ms^-1
6 ms^-1
10 ms^-1
12 ms^-1

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NEET Physics : Motion in A Plane

Multiple Choice Questions