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Solution


Q.

Assertion: When area of the conductor is halved then the resistance of the material gets doubled when length is kept constant.
Reason: Because resistance is inversely proportional to the area of a cross-section of the material.
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)

According to the formula: R=ρlA

Where, 
R : resistance
ρ : resistivity
l : length of conductor
A : area of cross section of conductor

Here, resistivity of the material never varies. If length is also kept constant and when area is halved then resistance of the material gets doubled as the resistance depends on 3 factors, i.e., length, area and nature of the material.

Thus, both assertion and reason are correct and reason is the correct explanation of assertion.