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Created on April 01, 2022 By Preptestsonline

Physics MCQs Set 4

1 / 15

The distance covered by a body in time t starting from rest is__________________?

at2/2

Vt

a2t/2

at2

2 / 15

When two bodies move toward each other with constant speeds the distance between them decreases at the rate of 6m / sec. If they move in the same direction the distance between them increases at the rate of 4m/sec. Then their speeds are________________?

5m/s, 1m/s

3m/s, 3m/s

6m/s, 1m/s

4m/s, 2m/s

3 / 15

The thrust on the rocket in the absence of gravitational force of attraction is__________________?

Constant

not constant

constant if the rate of ejected gases is constant

constant for short range rocket.

4 / 15

Which of the following is not an example of projectile motion ?

a gas filled ballon

bullet fired from gun

a football kicked

a base ball shot

5 / 15

The acceleration in the rocket at any instant is proportional to the nth power of the velocity of the expelled gases. Where the value of n must be ?

-1

1

2

-2

6 / 15

When collision between the bodies in a system is inelastic in nature then for system ____________________?

momentum changes but K.E remain conserve

K.E changes but momentum remain conserve

both momentum and K.E changes

both momentum and K.E remain conserve

7 / 15

A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion, taking g=10 ?

14 m

20 m

5 m

25 m

8 / 15

During long jump, athlete runs before taking the jump. By doing so he__________________?

provide him a larger inertia

decreases his inertia

decreases his momentum

increases his momentum

9 / 15

Motorcycle safety helmet extends the time of collision hence decreasing the________________?

chance of collision

force acting

velocity

impulse

10 / 15

When a body moves in a straight line then its displacement coincides with__________________?

distance

force

acceleration is zero

both A and B

11 / 15

Momentum depends upon__________________?

force acts on the body

mass of the body

velocity of the body

both mass and velocity of the body

12 / 15

2nd law of motion gives the definition of________________?

force

acceleration

velocity

both force and acceleration

13 / 15

Newtons laws do not hold good for particles_______________?

at rest

moving slowly

move with high velocity

move with velocity comparable to velocity of light

14 / 15

Which law of motion is also called law of inertia ?

1st law

2nd law

3rd law

all 1st, 2nd and 3rd laws

15 / 15

Slope of velocity time graph is_____________________?

acceleration

distance

force

momentum

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