Physics
The type of mirrors used in the headlamp of cars is

Spherical convex
Cylindrical concave
Plane
Parabolic concave

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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
Frost makes the pipes rusty, so they break
The material of which pipes are made contracts due to cold and so breaks
None of these

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