NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1851 - 1857 of 2320

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Question number: 1851

» Communication System » Sky and Space Wave Propagation

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MCQ▾

Question

Maximum usable frequency (MUF) in F-region layer is x, when the critical frequency is 55 MHz and the angle of incidence is 60°. Then x is (cos 70° = 0.34)

Choices

Choice (4)Response

a.

109 MHz

b.

110 MHz

c.

120 MHz

d.

150 MHz

Passage

Read the passage given below and answer the questions that follow:

The electron density of a layer of ionosphere at a height 150 km from the earth’s surface is 9 ⨯ 10 9 per m 3. For the sky transmission from this layer up to a range of 250 km,

Question number: 1852 (1 of 3 Based on Passage) Show Passage

» Communication System » Bandwidth of Signals

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MCQ▾

Question

Maximum usable frequency is,

Choices

Choice (4)Response

a.

3.5 ⨯ 10 10 Hz

b.

3.5 ⨯ 10 3 Hz

c.

3.5 ⨯ 10 6 HZ

d.

3.5 Hz

Question number: 1853 (2 of 3 Based on Passage) Show Passage

» Communication System » Sky and Space Wave Propagation

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MCQ▾

Question

The critical frequency of the layer is

Choices

Choice (4)Response

a.

2.78 kHz

b.

2.7 MHz

c.

2.7 Hz

d.

2 Hz

Question number: 1854 (3 of 3 Based on Passage) Show Passage

» Communication System » Basic Elements of Communication System

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MCQ▾

Question

Angle of incidence of this layer is

Choices

Choice (4)Response

a.

b.

c.

0 0

d.

Question number: 1855

» Experimental Skills » P-N Junction Diode

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MCQ▾

Question

Four diodes shown in the following diagrams, which one is reverse biased?

Choices

Choice (4)Response

a.

Diagram of diode and resistance choice A

Diagram of Diode and Resistance Choice A

b.

Diagram of diode and resistance choice B

Diagram of Diode and Resistance Choice B

c.

Diagram of diode and resistance choice C

Diagram of Diode and Resistance Choice C

d.

Diagram of diode and resistance choice D

Diagram of Diode and Resistance Choice D

Question number: 1856

» Oscillations and Waves » Doppler Effect in Sound

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MCQ▾

Question

A source of sound of frequency n is moving towards a stationary observer with a speed S. If the speed of sound in air is V and the frequency heard by the observer is n 1, the value of is,

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 1857

» Communication System » Amplitude and Frequency Modulation

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MCQ▾

Question

In frequency modulation

Choices

Choice (4)Response

a.

The frequency of modulated wave varies as amplitude of modulating wave

b.

The amplitude of modulated wave varies as amplitude of carrier wave

c.

The amplitude of modulated wave varies as frequency of carrier wave

d.

The frequency of modulated wave varies as frequency of modulating wave

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