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Physics

Physics
Rear view mirror of car is convex or concave?

Concave
Can't be determined
Both A & B
Convex

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Physics
What is the minimum distance (in metres) required to hear an echo?

17
21
13
10

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Physics
The rice is cooked more quickly in a pressure cooker because

None of these
Water boils at a higher temperature under pressure.
Less quantity of water is used.
It is covered.

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Physics
The period of revolution of a geostationary satellite is

24 hours
30 days
Changing continuously
365 days

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Physics
Water cannot be used to extinguish fire caused by electric current, because

It may cause hydrolysis
It may cause electrocution
It may cause electrolysis
It may spoil the wiring

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Physics
The spoon dropped by an astronaut in a satellite will

Fall to the floor
Move tangentially away
Continue to follow the motion of the satellite
Remain stationary

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