Laws of Motion (KVPY Stream-SA (Class 11) Physics): Questions 17 - 21 of 21

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Question number: 17

» Laws of Motion » Laws of Friction

MCQ▾

Question

A body moving on a rough horizontal surface comes to a stop in a distance 22 m. If the initial kinetic energy is 66 J, the force of the friction exerted on the body is –

Choices

Choice (4) Response

a.

3 N

b.

2 N

c.

5 N

d.

4 N

Question number: 18

» Laws of Motion » Laws of Friction

MCQ▾

Question

A block of mass 3 kg slides on an inclined plane making an angle of 300 with the horizontal. The coefficient of friction between the block and the surface is 23 . The force required to be applied to the block so that it moves down without any acceleration is –

Choices

Choice (4) Response

a.

2.27

b.

3.25

c.

2.0

d.

1.87

Question number: 19

» Laws of Motion » Equilibrium of Concurrent Forces

MCQ▾

Question

A soldier with a machine gun, falling from an airplane gets detached from his parachute. He is able to resist the downward acceleration if the shoots 60 bullets a second at the speed of 450 m/s. If the weight of a bullet is 53 gm, what is the weight of the man with the gun? Ignore resistance due to air and assume the acceleration due to gravity g = 9.8 ms–2

Choices

Choice (4) Response

a.

112 kg

b.

152 kg

c.

146 kg

d.

136 kg

Question number: 20

» Laws of Motion » Laws of Friction

MCQ▾

Question

A body moving on a rough horizontal surface comes to a stop in a distance 10 m. If the initial kinetic energy is 20 J, the force of the friction exerted on the body is –

Choices

Choice (4) Response

a.

3 N

b.

5 N

c.

2 N

d.

4 N

Question number: 21

» Laws of Motion » Dynamics of Uniform Circular Motion

Appeared in Year: 2016

MCQ▾

Question

A car goes around uniform circular track of radius R at a uniform speed v once in every T seconds. The magnitude of the centripetal acceleration is ac . If the car now goes uniformly around a larger circular track of radius 2R and experiences a centripetal acceleration of magnitude 8ac , then its time period is –

Choices

Choice (4) Response

a.

3T2

b.

3T

c.

2T

d.

T2

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