Question

Assertion (A): The heating element of an electric oven is made of nichrome wire, but the filament of bulb is made of tungsten.

Reason (R): Tungsten expands less as compared to nichrome on plug heated.

विकल्प

• Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).

• Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

• Assertion (A) is false, but Reason (R) is true.

• Assertion (A) is true, but Reason (R) is false.

Answer 1

Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A).

Explanation:

The assertion is true because nichrome is used in heating elements for its high resistivity and resistance to oxidation at high temperatures, while tungsten is used in bulb filaments because of its very high melting point. The reason is also true: tungsten expands less than nichrome when heated, but this is not the main reason for using tungsten in a filament. Therefore, R is true but does not correctly explain A.