Choose one or more correct alternatives.

For work to be performed, energy must be ….

i transferred from one place to another

ii concentrated

iii transformed from one type to another

iv destroyed

Option (iii) transformed from one type to another

Explanation: For work to be performed, energy must be transformed from one type to another though total energy remain same during this transformation.

Example, if we have to fill an tank overhead at some height with water, we will use electrical energy which will run motor and transfer it into mechanical energy of motor, which will push water towards tank i.e. work is done in displacing water from one place to another and this work is further converted to potential energy of water at some height above the ground , so energy transforms from one type to another in order to perform work.