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Physics

Physics
The coil wire in the electric room heater or electric cooking heater is called ________

Element
Circuit
Filament
Cells

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Physics
On a stationary sail boat, air is blown from a fan attached to the boat. The boat

does not move
moves in the same direction in which air blows
spins around
moves in opposite direction in which the air is blown

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Physics
Stars appear twinkling because of ......... of light.

Scattering
Absorption
Emission
Reflection

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Physics
Why is it difficult to breathe at higher altitudes?

Due to low temperature
Due to ozone
Due to high humidity
Due to low air pressure

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Physics
Acceptable noise level for human ear

< 85 db
> 85 db
= 85 db
None of these

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

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

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