# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1887 - 1891 of 2320

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## Question number: 1887

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MCQ▾

### Question

Acceleration due to gravity on a planet is 10 times the value on the earth. Escape velocity for the planet and the earth are V p and V e respectively. Assuming that the radii of the planet and the earth are the same, then –

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 1888

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MCQ▾

### Question

A sound wave of frequency travels horizontally to the right. It is reflected from a large vertical plane surface moving to the left with a speed V. The speed of sound in the medium is c.

### Choices

Choice (4)Response

a.

The wavelength of the reflected wave is

b.

The frequency of the reflected wave is

c.

The number of beats hears by a stationary listener to the left of the reflecting surface is

d.

The number of waves striking the surface per second is

## Question number: 1889

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MCQ▾

### Question

An observer is moving away from source of sound of frequency 500 Hz. His speed is 33 m/s. If speed of sound is 330 m/s, then the observed frequency is

### Choices

Choice (4)Response

a.

140 Hz

b.

130 Hz

c.

121 Hz

d.

110 Hz

## Question number: 1890

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MCQ▾

### Question

A source of sound placed at the open end of a resonance column sends an acoustic wave of pressure amplitude P 0 of the tube. If the atmospheric pressure is P A, then the ratio of maximum and minimum pressure at the closed end of the tube will be,

### Choices

Choice (4)Response

a.

b.

c.

d.

All of the above

## Question number: 1891

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MCQ▾

### Question

A source of sound of frequency 256 Hz is moving rapidly towards a wall with a velocity of 5 m/s. The speed of sound is 330 m/s. If the observer is between the wall and the source, then the beats heard per second will be,

### Choices

Choice (4)Response

a.

Zero

b.

7.06 Hz

c.

3.9 Hz

d.

7.76 Hz

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