Laws of Motion (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 12 - 15 of 20

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Question number: 12

» Laws of Motion » Static and Kinetic Friction

Appeared in Year: 2015

MCQ▾

Question

A small box resting on one edge of the table is struck in such a way that it slides off the other edge, 1 m away, after 2 seconds. The coefficient of kinetic friction between the box and the table –

Choices

Choice (4) Response

a.

Must be exactly 0.05

b.

Must be exactly zero

c.

Must be less than 0.05

d.

Must be more than 0.05

Question number: 13

» Laws of Motion » Centripetal Force

MCQ▾

Question

A gramophone disc makes 75 rpm. A coin of mass 60 gm is placed at a distance of 20 cm from the center. What is the centrifugal force acting on the coin?

Choices

Choice (4) Response

a.

1.5×102N

b.

1.740N

c.

2.0×102N

d.

0.740N

Question number: 14

» Laws of Motion » Equilibrium of Concurrent Forces

MCQ▾

Question

Figure shows a girder supporting a load of 20, 000 N. The compression force F in newton in the girder is –

A girder supporting a load

A Girder Supporting a Load

In figure a girder supporting a load of 20, 000 N. F is the compression forces.

Choices

Choice (4) Response

a.

150003

b.

7500

c.

75003

d.

75003

Question number: 15

» Laws of Motion » Equilibrium of Concurrent Forces

Appeared in Year: 2014

MCQ▾

Question

Consider the system shown below.

System consist of two boxes

System Consist of Two Boxes

In figure two boxes: X of mass 8kg and Y of mass 2 kg is adjacent to each other such that box Y does not slip downward under gravity.

A horizontal force F is applied to a block X of mass 8 kg such that the block Y of mass 2 kg adjacent to it does not slip downwards under gravity. There is no friction between the horizontal plane and the base of the block X. The coefficient of friction between the surfaces of blocks X and Y is 0.5. Take acceleration due to gravity to be 10 ms–2. The minimum value of F is,

Choices

Choice (4) Response

a.

240N

b.

40N

c.

200N

d.

160N

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