# NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 1838 - 1842 of 2142

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## Question number: 1838

MCQ▾

### Question

The mean distance of mars from sun is 1.213 times the distance of the earth from the sun. The period of revolution of mars around sun will be

### Choices

Choice (4) Response

a.

4.35 earth year

b.

1.05 earth year

c.

2.35 earth year

d.

1.34 earth year

## Question number: 1839

MCQ▾

### Question

The potential energy of gravitational interaction of a point mass m and a thin uniform rod of mass M and length l, if they are located along a straight line at a distance a from each other is-

### Choices

Choice (4) Response

a.

b.

c.

d.

## 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: 1840 (1 of 2 Based on Passage) Show Passage

MCQ▾

### Question

Young’s modulus of elasticity for quartz is -

### Choices

Choice (4) Response

a.

8.76 ⨯ 10 12 N/m 2

b.

7 ⨯ 10 11 N/m 2

c.

2 ⨯ 10 12 N/m 2

d.

Information insufficient

## Question number: 1841 (2 of 2 Based on Passage) Show Passage

MCQ▾

### Question

If the quartz plate is vibrating in 3 rd harmonic while measuring the frequency of 1.2 ⨯ 10 6 Hz, then the thickness of the plate is,

### Choices

Choice (4) Response

a.

7.175 cm

b.

0.07 cm

c.

6.02 cm

d.

71.75cm

## Question number: 1842

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.

2

c.

8

d.

6

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