Physics MCQs

Page No. 67

Laplace found that the alternate compressions and rarefactions produced in sound waves follows ________________?


aisothermal law


badiabatic law


cisochoric law


dall of the above


View Answer adiabatic law

Waves produced at the surface of water by a pencil executing vibrating motion if held vertically at a frequency of 50Hz are__________________?


aLongitudinal


bTransverse


cPeriodic


dboth A and C


View Answer both A and C

The dimension of elastic modulus is ___________________ ?


aML-1T-2


bML-2T-2


cMLT-2


dML2T-2


View Answer ML-1T-2

In open organ pipe___________________?


aonly even harmonics are present


bonly odd harmonics are present


cboth even and odd harmonics are present


dselected harmonics are present



A simple pendulum has a bob of mass m and its frequency is f. If we replaced the bob with a heavier one say of 2m then that will be its new frequency ?


a1/4f


b 1/2f


cfrequency lower than 20 Hz


d2f



Doppler effect applies to____________________?


asound wave only


b light wave only


cboth sound and light waves


dneither sound nor light wave



Beats are the results of____________________?


adiffraction of sound waves


b constructive and destructive interference


cpolarization


ddestructive interference



The periodic alternation of sound between maximum and minimum loudness are called___________________?


asilence zone


b interference


cbeats


dresonance


View Answer beats

The velocity of sound in air would become double than its velocity at 0°C at temperature________________?


a313°C


b586°C


c819°C


d1172°C


View Answer 819°C

The normal ear is the most sensitive in the frequency range___________________?


a20000 to 30000 hertz


b 10 to 20 hertz


c2000 to 4000 hertz


d6000 to 8000 hertz


View Answer 2000 to 4000 hertz

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