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Physics

Physics
The unit of electrical power is

Kilowatt hour
Watt
Ampere
Bolt

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Physics
Which phenomenon is responsible for the echo of sound wave?

Refraction
Polarisation
Reflection
Interference

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Physics
The motion of a body around a circular path is an example of

Uniform speed, variable acceleration
Uniform speed, uniform velocity
Uniform speed, variable velocity
Uniform velocity, variable acceleration

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Physics
The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall

Depends on the area of the wall
Increases with height of the wall
Increases with depth of the wall
Depends on the thickness of the wall

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Physics
A boat will submerge when it displaces water equal to its own:

Surface area
Weight
Volume
Density

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Physics
An electric fuse is based on

The magnetic effect of the current
All of these
The heating effect of the current
The chemical effect of the current

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