KVPY (Kishore Vaigyanik Protsahan Yojana) 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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