NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1825 - 1828 of 2184

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Question number: 1825

» Communication System » Need for Modulation

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MCQ▾

Question

An oscillator is producing FM waves of frequency 4 kHz and modulating index is 8. Thus calculate the variation.

Choices

Choice (4) Response

a.

0.67

b.

1.5

c.

5.0

d.

0.20

Question number: 1826

» Experimental Skills » P-N Junction Diode

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MCQ▾

Question

Which of the following statement is wrong regarding a p-n junction diode?

Choices

Choice (4) Response

a.

When the p-type section is connected to the negative terminal and the n-type section to the positive terminal of the battery the diode is said to be reverse biased

b.

When the diode is in forward biased mode a forward current flows.

c.

When the p-type section is connected to the positive terminal and the n-type section to the negative terminal of the battery the diode is called forward biased

d.

When the diode is in reverse biased mode a forward current flows

Question number: 1827

» Gravitation » Universal Law of Gravitation

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Question

If the satellite is stopped suddenly in its orbit which is at a distance = radius of earth from earth’s surface and allowed to fall freely into the earth, the speed with which it hits the surface of earth will be -

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1828

» Oscillations and Waves » Doppler Effect in Sound

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Question

A police car moving at 22 m/s, chases a motorcyclist. The police man sounds his horn at 180 Hz, while both of them move towards a stationary siren of frequency 162 Hz. Calculate the speed of the motorcycle, if it is given that he does not observes any beats

Choices

Choice (4) Response

a.

Zero

b.

22 m/s

c.

33 m/s

d.

28.7 m/s