Discussion
Assertion (A) : Nichrome is used as a heating element in devices like electric toaster and electric geyser.
Reason (R) : Nichrome has high melting point and low resistivity.
Answer: D
(A) is true and (R) is false.
Nichrome, an alloy of nickel and chromium, is used for heating elements in toasters, irons and geysers.
The reason is that it has a high resistivity, so a coil produces plenty of heat, together with a high melting point and resistance to oxidation when hot. (R) wrongly says low resistivity, so it is false.
Copper, with its low resistivity, is used for the connecting wires precisely because it does not heat up much.
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