# KVPY Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 162 - 165 of 268

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## Question number: 162

MCQ▾

### Question

The intensity of γ-rays from a source (I0) reduces to after passing through 33 mm thick sheet of lead. The thickness of the sheet for obtaining intensity equal to will be –

### Choices

Choice (4) Response

a.

11 mm

b.

24 mm

c.

44 mm

d.

9 mm

## Question number: 163

Appeared in Year: 2015

MCQ▾

### Question

A horizontal steel railroad track has a length of 100 m when the temperature is 250 C. The track is constrained from expanding or bending. The stress on the track on a hot summer day, when the temperature is 400 C, is –

(Note: the linear coefficient of thermal expansion for steel is and the Young’s modulus of steel is )

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 164

Appeared in Year: 2015

MCQ▾

### Question

A closed bottle containing water at 300 C is open on the surface of the moon. Then,

### Choices

Choice (4) Response

a.

The water will come out as a spherical ball.

b.

The water will freeze.

c.

The water will boil.

d.

The water will decompose into hydrogen and oxygen.

## Question number: 165

Appeared in Year: 2014

MCQ▾

### Question

Consider a spherical shell of radius R with a total charge + Q uniformly spread on its surface (center of the shell lies at the origin x = 0). Two point charge, +q and – q are brought, one after the other, from far away and placed at and, respectively. Magnitude of the work done in this process is

### Choices

Choice (4) Response

a.

b.

c.

d.

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