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AIIMS (All India Institute of Medical Sciences) Physics: Questions 220 - 222 of 500

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Question 220

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Appeared in Year: 2005

Question

Assertion-Reason▾

Assertion (Ꭺ)

For Reynold number Re > 2000, the flow of fluid is turbulent.

Reason (Ꭱ)

Inertial forces are dominant compared to the viscous forces at such high Reynold numbers

Choices

Choice (4)Response
a.Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ
b.Ꭺ is false but Ꭱ is true
c.Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
d.Both Ꭺ and Ꭱ are false

Question 221

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Appeared in Year: 2005

Question

Assertion-Reason▾

Assertion (Ꭺ)

By roughening the surface of a glass sheet its transparency can be reduced.

Reason (Ꭱ)

Glass sheet with rough surface absorbs more light.

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 true but Ꭱ is false
d.Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

Question 222

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Appeared in Year: 2006

Question

Assertion-Reason▾

Assertion (Ꭺ)

Electromagnetic waves with frequencies smaller than the critical frequency of ionosphere cannot be used for communication using sky wave propagation.

Reason (Ꭱ)

The refractive index of the ionosphere becomes very high for frequencies higher than the critical frequency.

Choices

Choice (4)Response
a.Both Ꭺ and Ꭱ are false
b.Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ
c.Ꭺ is true but Ꭱ is false
d.Ꭺ is false but Ꭱ is true