Physics
A dynamo is used to convert

Mechanical energy into electrical energy
Electrical energy into magnetic energy
Magnetic energy into mechanical energy
Electrical energy into mechanical energy

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Physics
Planets are

luminous heavenly bodies revolving around a star
luminous heavenly bodies that twinkle
non-luminous heavenly bodies
luminous heavenly bodies that do not twinkle

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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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