A good source of energy would be the one that would do a _ amount of work per unit volume of mass. Any source of energy we use to do work is consumed & _ is used again.

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Smaller, can be

Larger, cannot be

Larger, can be

Smaller, cannot be

answer is C.

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Detailed Solution

A good source of energy would be one that would do a larger amount of work per unit volume of mass. Any source of energy we use to do work is consumed & cannot be used again.
A good source of energy should have the following characteristics:

1. It should do a large amount of work per unit mass or volume - it means that the output energy must be more than the input energy. It should have a high calorific value.

2. It should be easily accessible - the energy source should be able to provide energy over a long period of time. Example: coal and petroleum.

3. Should be easy to store and transport - the most common sources of energy such as coal, petrol, and LPG need to be transported to users from their points of production. They also need proper storage. Thus it is important to store and transport these sources safely and economically.

4. Safe and convenient to use - energy sources should be safe as it is used by a large number of people and should be convenient.

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