NEET Physics: Questions 1431 - 1435 of 2098

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Question number: 1431

» Properties of Solids & Liquids » Surface Energy and Surface Tension

MCQ▾

Question

When a body falls in air, the resistance of air depends to a rate extent on the shape of the body, 3 different shapes disc, ball and cigar shape. Identify the combination of air resistances which truly represents the physical situation. (The cross sectional areas are the same).

Choices

Choice (4) Response

a.

2 < 3 < 1

b.

3 < 1 < 2

c.

3 < 2 < 1

d.

1 < 2 < 3

Question number: 1432

» Properties of Solids & Liquids » Stress-Strain Relationship

MCQ▾

Question

A copper rod 2m long is stretched by 1mm. Strain will be -

Choices

Choice (4) Response

a.

5 × 10 -4, volumetric

b.

5 × 10 -4, longitudinal

c.

10 -4, volumetric

d.

5 × 10 -3, volumetric

Question number: 1433

» Wave Optics » Wavefront

MCQ▾

Question

When the light source is moving towards the observer,

Choices

Choice (4) Response

a.

The wavelength of light remains same

b.

The wavelength of light decreases

c.

The velocity of light increases

d.

The wavelength of light increases

Question number: 1434

» Properties of Solids & Liquids » Heat Transfer » Conduction

MCQ▾

Question

A 10 cm thick ice block is there on the surface of water in a lake. The temperature of air is - 10° C; how much time it will take to double the thickness of the block (L = 80 cal/g, K ice = 0.004 erg/s-k, ρ ice = 0.92 gm cm -3)

Choices

Choice (4) Response

a.

51.11 hours

b.

21 hour

c.

19.11 hours

d.

191 hours

Question number: 1435

» Atoms and Nuclei » Bohr Model

Assertion-Reason▾

Assertion (Ꭺ)

Bohr postulated that the electrons in stationary orbits around the nucleus do not radiate energy.

Reason (Ꭱ)

According to classical physics all moving electrons radiate energy.

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.

Ꭺ is true but Ꭱ is false

d.

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

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