NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1872 - 1875 of 2320

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Question number: 1872

» Communication System » Amplitude and Frequency Modulation

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MCQ▾

Question

In an amplitude modulated wave for audio frequency of 500 cycle/second, the appropriate carrier frequency will be,

Choices

Choice (4)Response

a.

500 cycles/sec

b.

50 cycles/sec

c.

100 cycles/sec

d.

50,000 cycles/sec

Question number: 1873

» Oscillations and Waves » Beats

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Beats cannot be produced by light sources.

Reason (Ꭱ)

Light sources have constant phase difference.

Choices

Choice (4)Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

Question number: 1874

» Communication System » Propagation of Electromagnetic Waves in the Atmosphere

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Assertion-Reason▾

Question

Assertion (Ꭺ)

Television signals are not received through sky-wave propagation.

Reason (Ꭱ)

The ionosphere reflects electromagnetic waves of frequencies greater than a certain critical frequency.

Choices

Choice (4)Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT 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

Question number: 1875

» Gravitation » Escape Velocity

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MCQ▾

Question

Gas escapes from the surface of a planet because it acquires an escape velocity. The escape velocity will depend on which of the following factors:

(1) Mass of the planet

(2) Radius of the planet

(3) Mass of the particle escaping

(4) Temperature of the planet

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

Choices

Choice (4)Response

a.

1 and 2 are correct

b.

1.2 and 3 are correct

c.

1 and 3 are correct

d.

1 and 4 are correct

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