AIIMS (All India Institute of Medical Sciences) Physics: Questions 237 - 240 of 500

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Question number: 237

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

Appeared in Year: 2006

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.

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

Question number: 238

» Magnetic Effects of Current and Magnetism » Bar Magnet

Appeared in Year: 2002

Assertion-Reason▾

Assertion (Ꭺ)

We cannot think of a magnetic field configuration with three poles.

Reason (Ꭱ)

A bar magnet does exert a torque on itself due to its own field.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are false

b.

Ꭺ is false but Ꭱ is true

c.

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

d.

Ꭺ is true but Ꭱ is false

Question number: 239

» Ray Optics » Total Internal Reflection

Appeared in Year: 2006

Assertion-Reason▾

Assertion (Ꭺ)

In optical fiber, the diameter of the core is kept small.

Reason (Ꭱ)

This smaller diameter of the core ensures that the fiber should have incident angle more than the critical angle required for total internal reflection.

Choices

Choice (4) Response

a.

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

b.

Ꭺ is true but Ꭱ is false

c.

Ꭺ is false but Ꭱ is true

d.

Both Ꭺ and Ꭱ are false

Question number: 240

» Properties of Solids & Liquids » Stress-Strain Relationship

Appeared in Year: 2002

Assertion-Reason▾

Assertion (Ꭺ)

Stress is the internal force per unit area of a body

Reason (Ꭱ)

Rubber is more elastic than steel

Choices

Choice (4) Response

a.

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

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is false but Ꭱ is true

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