NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1433 - 1437 of 2142

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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

Question number: 1436

» Wave Optics » Huygens' Principle

MCQ▾

Question

Two waves originating from source S 1 and S 2 having zero phase difference and common wavelength X will show completely destructive interference at a point P if (S 1 P - S 2 P) is-

Choices

Choice (4) Response

a.

b.

c.

d.

2 λ

Question number: 1437

» Properties of Solids & Liquids » Specific Heat Capacity

MCQ▾

Question

Heat is supplied to a certain homogenous sample of matter, at a uniform rate. Its temperature is plotted against time, as shown. Which of the following conclusions can be drawn?

Temperature vs time graph - homogenous sample of matter

Temperature vs Time Graph - Homogenous Sample of Matter

In above fig we show that the graph of temp vs time which describe effect of heat on certain homogenous matter.

(1) Its specific heat capacity is greater in the liquid state than in the solid state

(2) Its latent heat of vaporization is greater than its latent heat of fusion

(3) Its specific heat capacity is greater in the solid state than in the liquid state

(4) Its latent heat of vaporization is smaller than its latent heat or fusion

Select the correct answers and mark it according to the following codes:

Choices

Choice (4) Response

a.

1, 2 and 3 are correct

b.

1 and 2 are correct

c.

2 and 4 are correct

d.

1 and 3 are correct

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