Which of the following is the most likely temperature of the filament of an electric light bulb when it is working on the normal 220 V supply line?

Which of the following characteristic is not suitable for a fuse wire?

In a filament type light bulb, most of the electric power consumed appears as :

If the current flowing through a fixed resistor is halved, the heat produced in it will become:

The electrical resistivities of four materials P, Q, R and S are given below :

P - 6.84 × 10^-8 Ω m

Q - 1.70 × 10^-8 Ω m

R - 1.0 × 10¹⁵ Ω m

S - 11.0 × 10^-7 Ω m

Which material will you use for making:

(a) heating element of electric iron

(b) connecting wires of electric iron

(c) covering of connecting wires? Give reason for your choice in each case.