# Oscillations and Waves [HBCSE Olympiads (Homi Bhabha Centre for Science Education) NSEP (Physics)]: Questions 1 - 4 of 8

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## Question 1

Oscillations and Waves

Appeared in Year: 2016

### Question

MCQ▾

Two factories are sounding their sirens at each. A man walks from one factory towards the other at a speed of . the speed of sound is . The number of beats heard per second by the man is

### Choices

Choice (4)Response

a.

7.5

b.

6

c.

2.5

d.

5

## Question 2

Oscillations and Waves

Appeared in Year: 2016

### Question

MCQ▾

The frequency of the sound produced by a siren increases from to while its amplitude remains the same. Therefore, the ratio of the intensity of the wave to that of the wave is –

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 3

Appeared in Year: 2016

### Question

MCQ▾

A vibrator of frequency is placed near one end of a long cylindrical tube. The tube is fitted with a movable piston at the other end. An observer listens to the sound through a side opening. As the piston is moved through , the intensity of sound recorded by the observer changes from a maximum to a minimum. If the speed of sound in air is , the frequency is –

### Choices

Choice (4)Response

a.

b.

c.

d.

## Question 4

Oscillations and Waves

Appeared in Year: 2016

### Question

MCQ▾

Out of the following differential equations, one that correctly represents the motion of a second՚s pendulum is –

### Choices

Choice (4)Response

a.

b.

c.

d.