AIIMS (All India Institute of Medical Sciences) Physics: Questions 235 - 237 of 500

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Question number: 235

» Dual Nature of Matter and Radiation » Dual Nature of Radiation

Appeared in Year: 2005

Assertion-Reason▾

Question

Assertion (Ꭺ)

A body that is a good radiator is also a good absorber of radiation at a given wavelength.

Reason (Ꭱ)

According to Kirchhoff’s law the absorptivity of a body is equal to its emissivity at a given wavelength.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is false but Ꭱ is true

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Question number: 236

» Kinetic Theory of Gases » Kinetic Theory of Gases

Appeared in Year: 2003

Assertion-Reason▾

Question

Assertion (Ꭺ)

The size of a hydrogen balloon increase as it rises in air.

Reason (Ꭱ)

The material of the balloon can be easily stretched.

Choices

Choice (4) Response

a.

Ꭺ is true but Ꭱ is false

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is false but Ꭱ is true

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Question number: 237

» X - Rays » Properties and Uses of X - Ray

Appeared in Year: 2006

Assertion-Reason▾

Question

Assertion (Ꭺ)

Standard optical diffraction gratings cannot be used for discriminating between different X-rays wavelengths.

Reason (Ꭱ)

The grating spacing is not of the order of X-rays wavelengths.

Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

d.

Both Ꭺ and Ꭱ are false

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