# NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 1855 - 1859 of 2142

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## Question number: 1855

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: 1856

MCQ▾

### Question

In frequency modulation

### Choices

Choice (4) Response

a.

The amplitude of modulated wave varies as amplitude of carrier wave

b.

The frequency of modulated wave varies as frequency of modulating wave

c.

The amplitude of modulated wave varies as frequency of carrier wave

d.

The frequency of modulated wave varies as amplitude of modulating wave

## Question number: 1857

MCQ▾

### Question

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

### Choices

Choice (4) Response

a.

175 MHz

b.

190 MHz

c.

150 MHz

d.

170 MHz

## Question number: 1858

Assertion-Reason▾

### Assertion (Ꭺ)

Gravitational potential of earth at every place on it is negative.

### Reason (Ꭱ)

Everybody on earth is bound by the attraction of earth.

### Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

c.

Both Ꭺ and Ꭱ are false

d.

Ꭺ is true but Ꭱ is false

## Question number: 1859

MCQ▾

### Question

Two planets of radii in the ratio 1: 2 are made from the materials of density in the ratio 3: 1. Then the ratio of acceleration due to gravity g 1 /g 2 at the surface of two planets will be

### Choices

Choice (4) Response

a.

b.

c.

d.

1

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