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MCQ : Sound - 2 - UPSC MCQ


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20 Questions MCQ Test Science & Technology for UPSC CSE - MCQ : Sound - 2

MCQ : Sound - 2 for UPSC 2024 is part of Science & Technology for UPSC CSE preparation. The MCQ : Sound - 2 questions and answers have been prepared according to the UPSC exam syllabus.The MCQ : Sound - 2 MCQs are made for UPSC 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for MCQ : Sound - 2 below.
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MCQ : Sound - 2 - Question 1

A key of a mechanical piano struck gently and then struck again but mush harder this time. In the second case

MCQ : Sound - 2 - Question 2

Sound can travel through

MCQ : Sound - 2 - Question 3

When we change feeble sound to loud sound we increase its

MCQ : Sound - 2 - Question 4

Sound takes 2 seconds to travel 3 kilometres in water. What is the speed of sound in water?

Detailed Solution for MCQ : Sound - 2 - Question 4

Here, distance = 3 km = 3000 m 
Time  = 2 sec 
Therefore, speed= distance / time
=  3000 /2
=  1500 m /s 

MCQ : Sound - 2 - Question 5

Infrasonic fi Audible fa and Ultrasonic fu sounds are related a 

Detailed Solution for MCQ : Sound - 2 - Question 5

Sound is only audible to the average humar ear if the frequencies lie between 20 Hz and 20 kHz. The actual range varies from person to person. Sound waves with frequencies less than 20 Hz are called infrasonic or subsonic and those with frequencies above 20 kHz are called ultrasonic

MCQ : Sound - 2 - Question 6

Ultrasonic waves have frequencies

MCQ : Sound - 2 - Question 7

Which of the following is not the character of mechanical waves ?

MCQ : Sound - 2 - Question 8

Ultrasound is an application of

MCQ : Sound - 2 - Question 9

Earthquake produces which kind of sound before the main shock wave begins

Detailed Solution for MCQ : Sound - 2 - Question 9

An earthquake produces infrasound before the mainshock wave begins. Infrasound is low-frequency sound less than 20hz.

MCQ : Sound - 2 - Question 10

Sound travels fastest in

MCQ : Sound - 2 - Question 11

Echo is not heard in a room of 10 m x 10 in x 10 m dimension due to (speed of sound in air = 300 m/s)

Detailed Solution for MCQ : Sound - 2 - Question 11

If you have persistence, you continue to do something even though it is difficult or others are against it. 

( As the sensation of sound persists in our brain for about 0.1 s, to hear a distinct echo the time interval between  the original sound and the reflected one must be at least 0.1 s. If we take the speed of the sound to be 300 m/s at a given temperature, in air, sound must go to the obstacle and reach back the ear of the listener on reflection after 0.1s. )

MCQ : Sound - 2 - Question 12

A key of a mechanical piano is struck gently and then struck again but much harder this time. In tine second case

MCQ : Sound - 2 - Question 13

The instruments Megaphone, Stethoscope, Hearing aids and Sound boards work based on the principle of

Detailed Solution for MCQ : Sound - 2 - Question 13

Reflection of sound is used in many devices. For example ; megaphone, loudspeaker, bulb horn, stethoscope, hearing aid, sound board etc.

MCQ : Sound - 2 - Question 14

In tlhe curve shown in figure half the wavelength is

Detailed Solution for MCQ : Sound - 2 - Question 14

Distance between two crests or troughs is called the wavelength. Distance between crest and trough is half of the distance. 

Wavelength λ = AE

By symmetry,

Hence, BD is half the wavelength.

MCQ : Sound - 2 - Question 15

Detailed Solution for MCQ : Sound - 2 - Question 15

MCQ : Sound - 2 - Question 16

Earthquake produces which kind of sound before the main shock begins?

MCQ : Sound - 2 - Question 17

Note is a sound

Detailed Solution for MCQ : Sound - 2 - Question 17

A note is a sound produced by a mixture of several frequencies. A sound produced by a single frequency is called a tone. 

MCQ : Sound - 2 - Question 18

Sound travels

Detailed Solution for MCQ : Sound - 2 - Question 18

Sound  travels faster in soilds than in liquids, and faster in liquids than in gases. This is because the density of solids is higher than that of liquids which means that the particles are closer together.

MCQ : Sound - 2 - Question 19

The minimum size of a room required to hear an echo of sound with a speed of 300 m/s is

Detailed Solution for MCQ : Sound - 2 - Question 19

To hear a distinct echo the time interval between the original sound and the reflected one must be at least 0.15

MCQ : Sound - 2 - Question 20

A thunder clap is heard 5.5 seconds after lightning flash. The distance of the flash is (Velocity of sound in air = 330 m/s)

Detailed Solution for MCQ : Sound - 2 - Question 20

The speed is 330 m / s and the time taken is 5.5 second. Therefore, the distance would be speed * time ⇒ 5.5 * 330 = 1815m

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