# KVPY (Kishore Vaigyanik Protsahan Yojana) Stream SB-SX (Class 12 & 1st Year B.Sc.) Physics: Questions 105 - 108 of 268

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## Question number: 105

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: 106

Appeared in Year: 2014

MCQ▾

### Question

Monochromatic light passes through a prism. Compared to that in air, inside the prism the light’s

### Choices

Choice (4) Response

a.

wavelength and frequency are different, but speed remains same.

b.

speed and wavelength are different but frequency remains same.

c.

speed, wavelength and frequency are all different.

d.

speed and frequency are different but wavelength remains same.

## Question number: 107

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: 108

Appeared in Year: 2013

MCQ▾

### Question

A wheel of radius R with an axle of radius is shown in the figure and is free to rotate about a frictionless axis through its centre and perpendicular to the page. Three forces (F, F, 2F) are exerted tangentially to the respective rims as shown in the figure,

The magnitude of the net torque acting on the system is nearly

### Choices

Choice (4) Response

a.

1.5 FR

b.

3.5FR

c.

2.5 FR

d.

3.2 FR

f Page