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Science true or false

Sound · UP Board (UPMSP) STD 9 (UPMSP - English Medium). 4 questions.

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4 questions · timed · auto-graded

Question 11 Mark
Echo can be heard in every room. [True/ False]
Answer
False.
Explanation:
They can't hear an echo in small room because in it the sound can't be reflected back. For an echo of a sound to be heard, the minimum distance between the source of sound and the walls of the room should be $17.2m$. Obviously, in a small room echoes cannot be heard.
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Question 21 Mark
Sound waves travel slower in vacuum than in water. [True/ False]
Answer
True.
Explanation:
The speed of sound in a vacuum is zero meters per second, as sound cannot travel in a vacuum. Sound is a wave, which means it spreads through the vibration of particles in a medium, such as water or air.
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Question 31 Mark
State whether the following statement is true or false: Sound produced by a vibrating body travels to our ears by the actual movement of air.
Answer
False.
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Question 41 Mark
Ultrasound can be used to test planeness of metal sheets. [True/ False]
Answer
True.
Explanation:
Ultrasonic Testing $(UT)$ uses high frequency sound energy to conduct examinations and make measurements. Ultrasonic inspection can be used for flaw detection/ evaluation, dimensional measurements, material characterization, and more.
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