Physics MCQs

Page No. 69

Newton estimated the speed of sound _____________________?


a281m/sec


b333m/sec


c340m/sec


dall of the above


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


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


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


cneither node nor antinode is formed


dsometimes a node and sometimes an antinode is formed



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