# PHYSICS MCQs FOR NEET - IIT JEE EXAMINATION (SET-6)

Topics Covered: Work, Power and Energy

Q1: A bullet is fired from a rifle, If the rifle recoils freely, then the kinetic energy of the rifle will be:

(a) same as that of bullet

(b) more than that of bullet

(c) less than that of bullet

(d) none of these

Q2: A body of mass 2 kg, initially at rest, is acted upon simultaneously by two forces, one of 4N and the other of 3N, acting at right angles to each other. The work done by the body after the 20s is

(a) 500 J

(b) 1250 J

(c) 2500 J

(d) 5000 J

Q3: Two bodies of masses m and 4m are moving with equal kinetic energy. Then the ratio of their linear momenta will be:

(a) 1:1

(b) 2:1

(c) 4:1

(d) 1:2

Q4: A small particle is acted upon by a force of constant magnitude, which is always perpendicular to the velocity of the particle. The motion of the particle takes place in a plane. It follows that:

(a) its kinetic energy is not fixed

(b) its acceleration is constant

(c) its velocity is constant

(d) it moves in a circular path

Q5: A ball hits the floor and rebounds after an inelastic collision. In this case

(a) the momentum of the ball just after the collision is the same as that just before the collision

(b) the total momentum of the ball and the earth is conserved

(c) the mechanical energy of the ball remains the same in the collision

(d) the total mechanical energy of the ball and the earth is conserved

Q6: A particle of mass m moving in the x-direction with speed 2v is hit by another particle of mass 2m moving in the y-direction with speed v . If the collision is perfectly inelastic, the percentage loss in the energy during the collision is close to

(a) 56%

(b) 50%

(c) 44%

(d) 62%

Q7: A body of mass 5kg has a momentum of 10kg m/sec. When a force of 0.2 N is applied to it for 10 seconds, the change in its K.E. is:

(a) 4.4 J

(b) 3.3 J

(c) 5.5 J

(d) 1.1 J

Q8: A body is falling freely under the action of gravity alone in a vacuum. Which of the following quantities remain constant during the fall?

(a) Kinetic energy

(b) Potential Energy

(c) Total Mechanical energy

(d) Total linear momentum

Q9: A body is initially at rest. It undergoes one-dimensional motion with constant acceleration. The power delivered to it at time t is proportional to:

(a) t½

(b) t

(c) t¹½

(d) t²

Q10: In case of inelastic collision (choose the incorrect statement):

(a) K.E. is conserved

(b) Linear momentum is conserved

(c) Total energy is conserved.

(d) It takes place under influence of non-conservative force.

Answers:

1: (c) less than that of bullet

2: (c) 2500 J

3: (d) 1:2

4: (d) it moves in a circular path

5: (b) the total momentum of the ball and the earth is conserved

6: (a) 56%

7: (a) 4.4 J

8: (c) Total Mechanical energy

9: (b) t

10: (a) K.E. is conserved

👉See Also:  #### Post a Comment

We love to hear your thoughts about this post!