Q.1
The resistance of a wire is 10W. Its length is increased by 10% by stretching. The new resistance will now be nearly
(a) 12 W
(b) 1.2 W
(c) 13 W
(d) 11 W
Ans : (a)
Q.2
The same mass of copper is drawn into two wires 1 mm and 2 mm thick. Two wires are connected in series and current is passed through them. Heat produced in the wire is in the ratio
(a) 2 : 1
(b) 1 : 16
(c) 4 : 1
(d) 16 : 1
Ans : (d)