# NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics: Questions 1842 - 1846 of 2320

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## Passage

A plate was cut from a quartz crystal and is used to control the frequency of an oscillating electrical circuit. Longitudinal standing waves are set up in the plate with displacement antinodes at opposite faces.

The fundamental frequency of vibration is given by the equation . Here s is thickness of the plate and density of quartz is 2658.76 kg/m 3.

## Question number: 1842 (2 of 2 Based on Passage) Show Passage

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MCQ▾

### Question

Young’s modulus of elasticity for quartz is -

### Choices

Choice (4)Response

a.

2 ⨯ 10 12 N/m 2

b.

Information insufficient

c.

8.76 ⨯ 10 12 N/m 2

d.

7 ⨯ 10 11 N/m 2

## Question number: 1843

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MCQ▾

### Question

Two whistles A and B produce notes of frequencies 660 Hz and 596 Hz respectively. There is a listener at the midpoint of the line joining them. Now the whistle B and the listener start moving with speed 30 m/s away from the whistle A. If speed of sound be 330 m/s, how many beats will be heard by the listener?

### Choices

Choice (4)Response

a.

4

b.

6

c.

8

d.

2

## Question number: 1844

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MCQ▾

### Question

The phenomenon by which light travels in an optical fibers

### Choices

Choice (4)Response

a.

Total internal reflection

b.

Transmission

c.

Re-reflection

d.

Refraction

## Question number: 1845

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MCQ▾

### Question

A satellite has to revolve round the earth in a circular orbit of radius 8 ⨯ 10 3 km. The velocity of projection of the satellite in this orbit will be -

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question number: 1846

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MCQ▾

### Question

A whistle sends out 256 waves in a second. If the whistle approaches the observer with velocity 1/3 of the velocity of sound in air, the number of waves per second the observer will receive,

### Choices

Choice (4)Response

a.

384

b.

192

c.

300

d.

200

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