Physics
Stationary wave is formed by

Two waves of the same speed superposing
Two waves of same frequency travelling in the opposite direction
A transverse wave superposing a longitudinal wave
Two waves of same frequency travelling in the same direction

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

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

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