# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1823 - 1826 of 2320

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## Question number: 1823

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MCQ▾

### Question

A source of sound and a listener are moving towards each other with a speed of the speed of sound. If the frequency of the note emitted by the source is f, the frequency of the note heard by the listener will be nearly:

### Choices

Choice (4)Response

a.

2.20 f

b.

1.18 f

c.

1.20 f

d.

2.0 f

## Question number: 1824

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MCQ▾

### Question

Select the wrong statements from the following

(1) The orbital velocity of a satellite increases with the radius of the orbit

(2) Escape velocity of a particle from the surface of the earth depends on the speed with which it is fired

(3) The time period of a satellite does not depend on the radius of the orbit

(4) The orbital velocity is inversely proportional to the square root of the radius of the orbit

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 4 are correct

d.

1 and 3 are correct

## Question number: 1825

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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

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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

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