# Oscillations and Waves (AIIMS (All India Institute of Medical Sciences) Physics): Questions 38 - 42 of 50

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## Question number: 38

» Oscillations and Waves » Doppler Effect in Sound

MCQ▾

### Question

A siren emitting sound of frequency 750 Hz is going away form a static listener with a speed of. The frequency of sound to be heard directly from the siren is –

### Choices

Choice (4) Response

a.

530 Hz

b.

669 Hz

c.

489 Hz

d.

344 Hz

## Question number: 39

» Oscillations and Waves » Harmonics

MCQ▾

### Question

A boat at anchor is rocked by waves whose crests are 130m apart and velocity is. The boat bounces up once in every –

### Choices

Choice (4) Response

a.

13 s

b.

100 s

c.

5 s

d.

10 s

## Question number: 40

» Oscillations and Waves » Speed of a Wave

MCQ▾

### Question

A tuning fork vibrating at 250 Hz produces a sound wave which travels in air at a speed. Find the distance travelled by sound during the time the fork makes 70 vibrations.

### Choices

Choice (4) Response

a.

65.5 m

b.

70 m

c.

92.4 m

d.

82.6 m

## Question number: 41

» Oscillations and Waves » Reflection of Waves

MCQ▾

### Question

A sound wave travelling with a velocity in medium A reaches a point on the interface of medium A and medium B. The velocity of wave in medium B is . What is the angle of incidence for total internal reflection?

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 42

» Oscillations and Waves » Displacement Relation for a Progressive Wave

MCQ▾

### Question

An earthquake generates both transverse (S) and longitudinal (P) sound waves in the earth. The speed of S waves is about and that of P waves is about. A seismograph records P and S waves from an earthquake. The first P wave arrives 6.0 min before the first S wave. The epicenter of the earthquake is located at a distance of about –

### Choices

Choice (4) Response

a.

450 km

b.

4860 km

c.

5250 km

d.

75 km

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