Physics MCQs

Page No. 69

Newton estimated the speed of sound _____________________?


a281m/sec

✓


b333m/sec

✖


c340m/sec

✖


dall of the above

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View Answer 281m/sec

Which one is the correct relation for fundamental frequency of open and closed pipe ?


afopen = 2 fclosed

✓


bfclosed = 2fopen

✖


cfopen = fclosed

✖


dfopen = 1 / f closed

✖


View Answer fopen = 2 fclosed

When the source of sound moves away form a stationary listener then ______________ occurs?


aan apparent increase in frequency

✖


ban apparent decrease in frequency

✓


can apparent decrease in wavelength

✖


dno apparent change in frequency

✖



Silence zone takes place due to____________________?


aconstructive interference

✖


b destructive interference

✓


cbeats

✖


d resonance

✖



The number of beats produced per second is equal to____________________?


athe sum of the frequencies of two tuning forks

✖


b the difference of the frequencies of two tuning forks

✓


cthe ratio of the frequencies of two tuning forks

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dthe frequency of either of the two tuning forks

✖



Ultrasonic have__________________?


a frequency in the audible range

✖


bfrequency is greater than 20 kHz

✓


cfrequency lower than 20 Hz

✖


dall of above

✖



The velocity of sound is greatest in___________________?


aWater

✖


bair

✖


ccopper

✓


dammonia

✖


View Answer copper

Velocity of sound in vacuum is ____________________?


a 332 ms-1

✖


b320 ms-1

✖


cZero

✓


d224 ms-1

✖


View Answer Zero

According to Newton sound travel in air under the conditions of_____________________?


aadiabatic

✖


bisothermal

✖


c isobaric

✓


disochoric

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View Answer isobaric

A stationary wave is set up in the air column of a closed pipe. At the closes end of the pipe _____________________?


aalways an node in formed

✓


balways an antinode is formed

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cneither node nor antinode is formed

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dsometimes a node and sometimes an antinode is formed

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