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Solution


Q.

Assertion: When more current flows to an electrical equipment it shows more heating of the same.
Reason: Heat flow is directly proportional to the square of current only.
1 Both assertion and reason are correct and reason is the correct explanation of assertion.  
2 Both assertion and reason are correct, but reason is not the correct explanation of assertion.  
3 Assertion is true, but reason is false.  
4 Assertion is false, but reason is true.  

Ans.

(3)

Heat flow is dependent on three factors:

1. Current flowing through it

2. Time period of flow of current

3. Resistance of the conductor

So, the reason is false that heat flow only depends on square of current. Thus, assertion is true, but reason is false.