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Physics

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

13
17
21
10

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Physics
What is the fundamental unit of amount of a substance?

Kelvin
Meter
Mole
Candela

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Physics
Rotameter is used to measure

Velocity of fluid in pipes
Flow of fluids
Vortex flow
Density of fluids

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Physics
It is more difficult to walk on ice than on a concrete road because

None of these
Ice is soft when compared to concrete
There is more friction between the ice and feer
There is very little friction between the ice and feet pressing it

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Physics
When a bullet is fired from a gun

The gun moves forward
The gun does not move
The gun jumps up
The gun recoils with the same momentum as the bullet

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Physics
Which sources produce alternating current (AC)?

All of these
Hydro-electric generators
Batteries
Solar power plants

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