Physics
It is difficult to cook rice

Under a mine
At the sea level
At the top of a mountain
Same anywhere

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Physics
Superconductors are substances which

offer no resistance to the flow of electricity
offer high resistance to the flow of current
conduct electricity at low temperature
conduct electricity at high temperatures

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Physics
Solids have definite shapes.This is because

The forces of adhesion are less
The forces of cohesion are very large
The forces of cohesion of the molecules within are very much less in them
The forces of adhesion are large

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