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Physics

Physics
Brightness of bulb depends on voltage or current?

Current
None
Voltage
Both A & B

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Physics
Why do birds not have respiratory trouble at the time of flying at high altitude ?

They use less oxygen
Their lungs are very large
They have extra air sacs
They fly inactively

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Physics
Surface tension in a liquid is due to :

Cohesive force between molecules
Adhesive force betweenmolecules
Gravitational force between molecules
Electrical force between molecules.

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Physics
Microphone is a device which transforms the

Current signal into sound signal
Sound signal into light signal
Sound signal into current signal
Light signal into sound signal

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Physics
What type of lens is used in a magnifying glass

Convex
None of these
Plano-concave
Concave

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Physics
A person lifts luggage of 20 kg from the ground and puts it on his head 2m above the ground. Calculate the work done by him. (g = 10 )

200J
40J
20 J
400J

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