AIIMS (All India Institute of Medical Sciences) Physics: Questions 219 - 222 of 500

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Question number: 219

» Oscillations and Waves » Harmonics

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Appeared in Year: 2006

MCQ▾

Question

A boat at anchor is rocked by waves whose crests are 100m apart and velocity is . The boat bounces up once in every –

Choices

Choice (4)Response

a.

0.25 s

b.

2500 s

c.

75 s

d.

4 s

Question number: 220

» Properties of Solids & Liquids » Reynolds Number

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Appeared in Year: 2005

Assertion-Reason▾

Question

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 number: 221

» Ray Optics » Snell's Law

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Appeared in Year: 2005

Assertion-Reason▾

Question

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 number: 222

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

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Appeared in Year: 2006

Assertion-Reason▾

Question

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

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