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

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Question 235

Appeared in Year: 2005

Question

Assertion-Reason▾

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 true and Ꭱ is the correct explanation of Ꭺ

b.

Ꭺ is false but Ꭱ is true

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

Question 236

Appeared in Year: 2003

Question

Assertion-Reason▾

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.

Both Ꭺ and Ꭱ are false

b.

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

c.

Ꭺ is true but Ꭱ is false

d.

Ꭺ is false but Ꭱ is true

Question 237

Appeared in Year: 2006

Question

Assertion-Reason▾

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.

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

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is false but Ꭱ is true

d.

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

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