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Solution


Q.

Read the passage given below and answer the following questions from (i) to (v).

The electrical energy consumed by an electrical appliance is given by the product of its power rating and the duration for which it is used. SI unit of electrical energy is the joule. Where a large quantity of energy is involved, using a joule is not convenient as a unit. So, for commercial purposes, bigger units of electrical energy are involved. 1 kilowatt-hour =  3.6 × 106  joules of electrical energy.

 

(i) The value of energy dissipated by a certain heater is E. If the duration of operation of the heater is doubled, the energy dissipated will be:
1 halved  
2 doubled  
3 four-times  
4 remains same  

Ans.

(2)