# KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 20 - 22 of 268

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## Question number: 20

Appeared in Year: 2010

MCQ▾

### Question

A ball is dropped vertically from a height of h onto a hard surface. If the ball rebounds from the surface with a fraction r of the speed with which it strikes the latter on each impact, what is the net distance traveled by the ball up to the 10th impact?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 21

Appeared in Year: 2011

MCQ▾

### Question

Two rods, one made of copper and the other steel of the same length and cross sectional area are joined together. (The thermal conductivity of copper is 385 J s–1 m –1 K-1 and steel is 50 J s–1 m –1K–1) If the copper end is held at 1000C and the steel end is held at 00C, what is the junction temperature (assuming no other heat losses)?

### Choices

Choice (4) Response

a.

880C

b.

120C

c.

500C

d.

730C

## Question number: 22

Appeared in Year: 2010

MCQ▾

### Question

A certain planet completes one rotation about its axis in time T. The weight of an object placed at the equator on the planet’s surface is a fraction f (f is close to unity) of its weight recorded at a latitude of 600. The density of the planet assumed to be a uniform perfect sphere is given by –

### Choices

Choice (4) Response

a.

b.

c.

d.

f Page