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Solution


Q.

Assertion: Bulbs are filled with inactive nitrogen and argon gases.
Reason: As there is a requirement of thermal isolation of the filament.

 
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.

(1)

Most part of the power consumed by bulb is dissipated as heat but very less part gets converted into light. So, there is a need for thermal isolation in order to reduce heat losses. This is the reason why bulbs are filled with inactive nitrogen and argon. Thus, both assertion and reason are correct and reason is the correct explanation of assertion.