KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics: Questions 106 - 108 of 250

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Question number: 106

» Ray Optics » Reflection and Refraction of Light

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

» 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.

0.995f

b.

1.005f

c.

0.990f

d.

1.010f

Question number: 108

» Rotational Motion » Torque

Appeared in Year: 2013

MCQ▾

Question

A wheel of radius R with an axle of radius R2 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,

A wheel of radius R with an axle of radius R/2

A Wheel of Radius R With an Axle of Radius R/2

In figure a wheel of radius R with an axle of radius R/2 is shown. Three forces: F, F and 2F are exerted tangentially to the respective rims

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

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