Question

choose True or false:
I)To do work energy is required.
ii) Wind energy is a conventional source of energy.
iii) During burning,chemical energy is converted into heat energy.
iv)Solar energy is the cheapest form of energy.
v)Energy in compressed springs is mechanical energy.​

Answer 1

Answer:

1 true

2 false

3 true

4 true

5 true

Answer 2

Answer:

• true( muscular energy is need to do a work)
• false( it is a non conventional source)
• true( carbon reacts with oxygen to form CO² and heat and light)
• false ( because coal is the cheapest source of electricity, and that is why more than 70% of electricity is produced by thermal power plants)
• false( it is potential energy)

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