Laws of Motion (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream-SA (Class 11) Physics): Questions 16 - 19 of 21

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Question number: 16

» Laws of Motion » Static and Kinetic Friction

MCQ▾

Question

Mark the correct statements:

Select the correct option:

(1) Coefficient of static friction is always greater than that of kinetic friction.

(2) Limiting friction is always greater than the kinetic friction.

(3) Limiting friction can never be less than static friction.

(4) Static friction is always greater than the kinetic friction.

Choices

Choice (4) Response

a.

(1), (2) and (3) are correct

b.

(1) and (3) are correct

c.

(2) and (4) are correct

d.

(2) and (3) are correct

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 isEquation . 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

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