Physics
A dynamo is used to convert

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

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Physics
The earth is a

Bad absorber and bad radiator of heat
Good reflector of heat
Non-absorber of heat
Good absorber and good radiator of heat

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Physics
Two identical solid pieces, one of gold and other of silver, when immersed completely in water exhibit equal weights. When weighed in air (given that density of gold is greater than that of silver)

Both silver and gold pieces weigh equal
The gold piece will weigh more
Weighing will depend on their masses
The silver piece will weigh more

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