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CBSE

NEET Physics : Motion in Straight Line

Multiple Choice Questions

111.

A particle is travelling along a straight line OX. The distance x (in metre) of the particle from O at a time t is given by x = 37 + 27t − t³, where t is time in seconds. The distance of the particle from O when it comes to rest is

81 m
91 m
101 m
111 m

112.

A box of mass 2 kg is placed on the roof of a car. The box would remain stationary until the car attains a maximum acceleration. Coefficient of static friction between the box and the roof of the car is 0.2 and g = 10 ms^-2. This maximum acceleration of the car, for the box to remain stationary, is

8 ms^-2
6 ms^-2
4 ms^-2
2 ms^-2

113.

If a person can throw a stone to maximum height of h metre vertically, then the maximum distance through which it can be thrown horizontally by the same person is

$\frac{h}{2}$
h
2h
3h

114.

A bullet emerge from a barrel of length 1.2 m with a speed of 640 ms^-1 . Assuming constant acceleration, the approximate time that it spends in the barrel after the gun is fired is

4 ms
40 ms
400 μs
1 s

115.

A rocket of mass 100 kg burns 0.1 kg of fuel per sec. If velocity of exhaust gas is 1 km/sec, then it lifts with an acceleration of

1000 ms^-2
100 ms^-2
10 ms^-2
1 ms^-2

116.

A particle is moving with a constant speed v in a circle. What is the magnitude of average velocity after half rotation ?

2v
$2 \frac{v}{π}$
$\frac{v}{2}$
$\frac{v}{2 π}$

117.

The acceleration a (in ms^-2 ) of a body, starting from rest varies with time t (in s) following the equation a = 3 t + 4. The velocity of the body at time t = 2 s will be

10 ms^-1
18 ms^-1
14 ms^-1
26 ms^-1

Short Answer Type

118.

A shell of mass m is at rest initially. It explodes into three fragments having masses in the ratio 2 : 2 : 1. The fragments having equal masses fly off along mutually perpendicular direction with speed v. What will be the speed of the third (lighter) fragment ?