Physics
In which one of the following the phenomenon of total internal reflection of light is used ?

Formation of mirage
Twinkling of stars
Working of binoculars
Formation of rainbow

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

The material of which pipes are made contracts due to cold and so breaks
None of these
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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