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Physics

Physics
The unit of electrical power is

Watt
Kilowatt hour
Bolt
Ampere

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Physics
Which determines the frequency of a sound wave?

Medium
Amplitude
Speed
Source

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Physics
A man stands in a lift which accelerates upwards. The resultant reaction force on the floor of the lift is

Greater than the weight of the man
Same as the weight of the man
Less than the weight of the man
Zero

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Physics
Which phase change is an example of an exothermic process?

Gas to Solid
All listed here
Liquid to Solid
Gas to Liquid

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Physics
Ohm's law is valid in case of

Superconductor
Insulator
Conductor
Semiconductor

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Physics
When hot liquid is poured into a thick glass tumbler, it cracks because glass :

Has high temperature coefficient of expansion
Is a bad conductor of heat so only inner surface expands
Has a very low specific heat
Has low temperature coefficient of expansion

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