NEET Physics: Questions 1825 - 1828 of 2099

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Question number: 1825

» Communication System » Need for Modulation

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.

5.0

b.

0.20

c.

0.67

d.

1.5

Question number: 1826

» Experimental Skills » P-N Junction Diode

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 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

c.

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

d.

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

Question number: 1827

» Gravitation » Universal Law of Gravitation

MCQ▾

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.

7.919msec

b.

11.2kmsec

c.

7.919kmsec

d.

11.2msec

Question number: 1828

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

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.

33 m/s

b.

22 m/s

c.

Zero

d.

28.7 m/s

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