Class 10 Physics MCQs - Chapter 9

Sound Trivia Questions & Answers PDF Download - 4

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The Trivia MCQ: To communicate with each other, Elephants use; "Sound" App APK Download with answers: Low frequency light waves; Low frequency sound waves; High frequency sound waves; Low frequency heat waves; for high school certification courses. Practice Echo of Sound MCQ Questions, download Kindle eBook (Free Sample) for online school courses.

Sound Test Questions and Answers PDF Download: MCQ 4

MCQ 16:

To communicate with each other, Elephants use

low frequency sound waves
low frequency light waves
high frequency sound waves
low frequency heat waves

MCQ 17:

The technique or method to absorb undesirable sounds by soft and porous surface is called

acoustic protection
unacoustic protection
audible protection
decibel protection

MCQ 18:

A normal human ear can hear a sound only if its frequency lies between

30 Hz to 30,000 Hz
50 Hz to 50,000 Hz
20 Hz to 20,000 Hz
10 Hz to 10,000 Hz

MCQ 19:

The speed of sound in air is

343ms^-1
343ms^-2
341ms^-1
250ms^-1

MCQ 20:

The speed of sound can be found by relation

v = cλ
v = ma
v = fλ
f=¹ ⁄ _T

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