Physics
Solar energy is due to

Combustion reactions
Fusion reactions
Fission reactions
Chemical reactions

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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 silver piece will weigh more
Weighing will depend on their masses
The gold piece will weigh more

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