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2
MCQ (Single Correct Answer)

A proton is kept at rest. A positively charged particle is released from rest at a distance $d$ in its field. Consider two experiments; one in which the charged particle is also a proton and in another, a positron. In the same time $$t$$, the work done on the two moving charged particles is

A
same as the same force law is involved in the two experiments
B
less for the case of a positron, as the positron moves away more rapidly and the force on it weakens
C
more for the case of a positron, as the positron moves away a larger distance
D
same as the work done by charged particle on the stationary proton
3
MCQ (Single Correct Answer)

A man squatting on the ground gets straight up and stand. The force of reaction of ground on the man during the process is

A
constant and equal to mg in magnitude
B
constant and greater than mg in magnitude
C
variable but always greater than $$m g$$
D
at first greater than $$m g$$ and later becomes equal to $$m g$$
4
MCQ (Single Correct Answer)

A bicyclist comes to a skidding stop in 10 m . During this process, the force on the bicycle due to the road is 200 N and is directly opposed to the motion. The work done by the cycle on the road is

A
+2000J
B
$$-$$200J
C
zero
D
$$-$$20,000J
5
MCQ (Single Correct Answer)

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

A
Kinetic energy
B
Potential energy
C
Total mechanical energy
D
Total linear momentum
6
MCQ (Single Correct Answer)

During inelastic collision between two bodies, which of the following quantities always remain conserved?

A
Total kinetic energy
B
Total mechanical energy
C
Total linear momentum
D
Speed of each body
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