Physics
When a bar magnet is cut into two equal halves, the pole strength of each piece –

Becomes half
Becomes zero
Becomes double
Remains the same

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

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

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