NEST (National Entrance Screening Test) Physics: Questions 14 - 17 of 58

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Question number: 14

» Atoms and Nuclei » Half Life and Mean Life

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Appeared in Year: 2008

MCQ▾

Question

A sample of radioactive nuclei of a certain element can decay by both emission and emission. The half – life for emission is minutes and that for emission is minutes. The half – life for the sample is nearly –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 15

» Thermodynamics » Thermodynamic Processes

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Appeared in Year: 2007

MCQ▾

Question

of hydrogen gas at standard temperature and pressure are contained in a cylinder with a movable piston. The walls of the cylinder and also the piston are insulated. If the gas is compressed to one third of its original volume, the pressure of the gas will be –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 16

» Dual Nature of Matter and Radiation » Black-Body Radiation

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Appeared in Year: 2008

MCQ▾

Question

The intensity of solar radiation received by the Earth is . Assuming the Earth to be a perfect spherical blackbody, its equilibrium temperature is nearly –

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 17

» Kinetic Theory of Gases » Kinetic Energy and Temperature

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Appeared in Year: 2008

MCQ▾

Question

moles of nitrogen gas is kept in a canister at a temperature of . Due to a leak in the canister the pressure drops to of its original value and the temperature drops to . Assuming nitrogen to be an ideal gas, the amount of nitrogen (in moles) that has leaked out is –

Choices

Choice (4) Response

a.

12

b.

24

c.

7.5

d.

6