# Oscillations and Waves (KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics): Questions 12 - 15 of 27

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## Question number: 12

» Oscillations and Waves » Simple Pendulum

Appeared in Year: 2012

MCQ▾

### Question

A simple pendulum is released from rest at the horizontally stretched position. When the string makes an angle θ with the vertical, the angle ϕ which the acceleration vector of the bob makes with the string is given by,

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 13

» Oscillations and Waves » Doppler Effect in Sound

Appeared in Year: 2014

MCQ▾

### Question

A whistle emitting a loud sound of frequency 540 Hz is whirled in a horizontal circle of radius 2 m and at a constant angular speed of 15 rad/s. The speed of sound is 330 m/s. The ratio of the highest to the lowest frequency heard by a listener standing at rest at a large distance from the center of the circle is –

### Choices

Choice (4) Response

a.

1.1

b.

1.2

c.

1.4

d.

1.0

## Question number: 14

» Oscillations and Waves » Doppler Effect in Sound

Appeared in Year: 2013

MCQ▾

### Question

An engine moving away from a vertical cliff blows a horn at a frequency f. Its speed is 0.5 % of the speed of sound in air. The frequency of the reflected sound received at the engine is –

### Choices

Choice (4) Response

a.

b.

c.

d.

## Question number: 15

» Oscillations and Waves » Standing Waves in Strings and Organ Pipes

Appeared in Year: 2012

MCQ▾

### Question

A standing wave in a pipe with a length L = 1.2 m is described y,

Based on above information, which one of the following statement is incorrect?

(Speed of sound in air is 300 ms-1)

### Choices

Choice (4) Response

a.

The frequency of the fundamental mode of vibrations is 137.5 Hz

b.

There could be a nods at and antinode at

c.

A pipe is closed at both ends

d.

The wavelength of the wave could be 0.6 m

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