# Laws of Motion (KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 10 - 13 of 20

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## Question number: 10

» Laws of Motion » Equilibrium of Concurrent Forces

MCQ▾

### Question

An object is tied to a string and rotated in a vertical radius r. Constant speed is maintained along the trajectory. If, then, is –

(T indicates tension in the string)

### Choices

Choice (4) Response

a.

1

b.

3

c.

4

d.

2

## Question number: 11

» Laws of Motion » Law of Conservation of Linear Momentum

MCQ▾

### Question

A bob of mass 0.575 kg hangs from the massless string of a long simple pendulum. A bullet of mass 0.025 kg is fired vertically from below into the bob. The bullet gets embedded into the bob and the combination rises vertically through a height of 0.8 m. If g = 10 ms-2, then the velocity of the bullet is –

### Choices

Choice (4) Response

a.

b.

c.

d.

## 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.

b.

c.

d.

f Page