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Physics

Physics
Ultrasound devices operate with minimum frequency from

20kHz
45 kHz
35 kHz
60 kHz

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Physics
The ordinary and maximum tolerance limit of sound by human being is

65 db to 75 db (decibel)
70 db to 85 db (decibel)
60 db to 80 db (decibel)
50 db to 70 db (decibel)

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Physics
A body absorbs heat most if it is

Black and smooth
Black and rough
White and rough
White and smooth

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Physics
The force exerted by a magnet is an example of ________

Muscular force
Non-contact force
Electrostatic force
Contact force

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Physics
Echolocation is an adaptation bats use to

Locate flowering plants
Find warm places for hibernation
Hunt insects in flight
All of these

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Physics
In a Carnot engine when heat is taken from the source, its temperature

Decreases and then remains constant
Remains constant
Increases
Decreases

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