1
NDA General Ability 21 April 2024
+4
-1.33

A ball of 0.1 kg mass is dropped on a hard floor from a height of 0.45 m and rises to a height of 0.2 m. If it was in touch with the floor for 0.1 s, the net force it applied on the floor while bouncing is : (take the gravitational acceleration g = 10 m s⁻²)

A

1.0 N

B

6.0 N

C

3.0 N

D

5.0 N

2
NDA General Ability 21 April 2024
+4
-1.33

Which one of the following statements regarding simple pendulum is correct?

Simple pendulum has a time period independent of amplitude:

A

only for small amplitudes because then the net force on its bob is independent of its displacement.

B

for any amplitude because the net force on the bob is always proportional to its displacement.

C

for any amplitude because the net force on the bob is independent of its displacement.

D

only for small amplitudes because then the net force on its bob is proportional to its displacement.

3
NDA General Ability 21 April 2024
+4
-1.33

Which one of the following about different frictional forces is correct?

A

Kinetic friction > Static friction > Rolling friction

B

Static friction > Rolling friction > Kinetic friction

C

Static friction > Kinetic friction > Rolling friction

D

Static friction > Kinetic friction = Rolling friction

4
NDA General Ability 21 April 2024
+4
-1.33

A metallic bob X of mass m is released from position A. It collides elastically with another identical bob Y placed at rest at position B on a horizontal frictionless table. The angle AOB is 30°.

How high does the bob X rise immediately after the collision?

A

To the same height as that of position A on the other side in the same trajectory

B

To half the height as that of position A on the other side along the same trajectory

C

The same height at position A

D

It stops at position B

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