Question

Assertion (A): Alloys are commonly used in electrical heating devices like electric iron and heater.

Reason (R): Resistivity of an alloy is generally higher than that of its constituent metals but the alloys have low melting points then their constituent metals.

Options

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

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

• (A) is true but (R) is false.

• (A) is false but (R) is true.

Answer 1

(A) is true but (R) is false.

Explanation:

Alloys (e.g., nichrome) are used in electric irons and heaters because they have higher resistivity, so they produce heat efficiently for a given current. The reason statement is false about melting points, heating-element alloys are chosen to have high melting points (so they don’t melt), so the claim that alloys generally have lower melting points than their constituent metals is incorrect.