1
NDA General Ability 21 April 2024
+4
-1.33

Escape speed from the Earth is close to 11.2 km s⁻¹. On another planet whose radius is half of the Earth's radius and whose mass density is four times that of the Earth, the escape speed in km s⁻¹ will be close to :

A

11.2

B

15.8

C

5.6

D

7.9

2
NDA General Ability 21 April 2024
+4
-1.33

Which one of the following does not apply to sound waves in fluids?

A

They transport energy

B

They need a medium to travel

C

They are transverse

D

They travel faster in liquids than in gases

3
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

4
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.

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