Physics
A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will

Remain unaffected
Have its shape changed
Increase
Decrease

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Physics
Water pipes in hilly areas often burst on a cold frosty night, because

None of these
Frost makes the pipes rusty, so they break
Water in the pipes freezes and on freezing water expands, so pipes break
The material of which pipes are made contracts due to cold and so breaks

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