Oscillations and Waves (KVPY Stream SB-SX (Class 12 & 1st Year BSC) Physics): Questions 12 - 14 of 26

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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,

A simple pendulum making an angle (theta)

A Simple Pendulum Making an Angle (Theta)

In figure a simple pendulum made an angle (theta) with the vertical.

Choices

Choice (4) Response
a.

ϕ=π2

b.

ϕ=0

c.

ϕ=tan1(2tanθ)

d.

ϕ=tan1(tanθ2)

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.

0.995f

b.

1.005f

c.

0.990f

d.

1.010f

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