Question

Which combination of statements is correct?
i. If electrical resistivity of metal $X$ is lower than that of metal $Y,$ it means metal $X$ is better conductor of electricity than metal $Y.$
ii. If a wire of resistance $8\Omega$ is doubled on itself, the resistance of the new wire will be $2\Omega .$
iii. The coils of electric toasters and irons are made of an alloy rather than a pure metal because resistivity of the alloy is higher than that of its constituent metals.
iv. If a conductor of length $65cm$ has a resistance of $4\Omega ,$ the same conductor of length $260cm$ will have the resistance of $16\Omega .$
v. The maximum amount of current that can pass through a conductor is $440A.$

• A. i, iii and v
• B. i, ii, iii and iv
• C. iii, iv and v
• D. iii and iv only

Answer 1

The correct option is C iii, iv and v

iii) The coils of electric toasters and irons are made of an alloy rather than a pure metal because resistivity of the alloy is higher than that of its constituent metals

iv) If a conductor of length65 cm has a resistance of 4Ω, the same conductor of length 260 cm will have the resistance of 16

v)the maximum amount of current that can pass through

a conductor is 440 A.

the statements is correct is C.