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Physics

Physics
The plastic material commonly used for making gear wheels is

Polyesters
Nylons
Polystyrene
Bakelit

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Physics
Fuse wire is made of an alloy of

Copper and Silver
Lead and Copper
Tin and Copper
Tin and Lead

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Physics
The velocity of sound is more in

Steel
Water
Air
Wood

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Physics
For which of the following substances, the resistance decreases with increase in temperature?

Platinum
Copper
Pure silicon
Nichrome

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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 spoil the wiring
It may cause electrolysis

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Physics
The device used to change the speed of an electric fan is

Rectifier
Switch
Amplifier
Regulator

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