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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
7
MCQ (Single Correct Answer)

Two inclined frictionless tracks, one gradual and the other steep meet at A from where two stones are allowed to slide down from rest, one on each track as shown in figure. Which of the following statement is correct?

A
Both the stones reach the bottom at the same time but not with the same speed
B
Both the stones reach the bottom with the same speed and stone I reaches the bottom earlier than stone II
C
Both the stones reach the bottom with the same speed and stone II reaches the bottom earlier than stone I
D
Both the stones reach the bottom at different times and with different speeds
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