# Oscillations and Waves (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 135 - 139 of 195

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## Question number: 135

» Oscillations and Waves » Speed of a Wave

MCQ▾

### Question

A man is standing between two parallel cliffs and fires a gun. If he hears first and second echoes after 1.5 s and 3.5s respectively, the distance between the cliffs is (Velocity of sound in air = 340 ms -1)

### Choices

Choice (4) Response

a.

510 m

b.

850 m

c.

595 m

d.

1190 m

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## Question number: 136

» Oscillations and Waves » Displacement Relation for a Progressive Wave

MCQ▾

### Question

The equation of a progressive wave is given by where x and y are in meter and t is in second. The velocity of the wave is,

### Choices

Choice (4) Response

a.

b.

c.

d.

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## Question number: 137

» Oscillations and Waves » Displacement Relation for a Progressive Wave

MCQ▾

### Question

The relation between time and displacement for two particles is given by

,

The ratio of the intensities of the waves produced by the vibrations of the two particles will be

### Choices

Choice (4) Response

a.

1: 9

b.

9: 1

c.

1: 2

d.

2: 1

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## Question number: 138

» Oscillations and Waves » Reflection of Waves

Assertion-Reason▾

### Assertion (Ꭺ)

Sound from a tuning fork is louder when its stem is placed on a desktop

### Reason (Ꭱ)

When a wave reaches another denser medium some part of it is reflected.

### Choices

Choice (4) Response

a.

Ꭺ is false but Ꭱ is true

b.

Both Ꭺ and Ꭱ are false

c.

Ꭺ is true but Ꭱ is false

d.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

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## Question number: 139

» Oscillations and Waves » Wave Motion

MCQ▾

### Question

A wave of frequency 500 Hz has velocity 360 m/sec. The distance between two nearest points 60° out of phase, is

### Choices

Choice (4) Response

a.

12 cm

b.

60 cm

c.

120 cm

d.

0.6 cm

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