A piece of wire of resistance R is cut into five equal parts. These parts are then connected in

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1. A piece of wire of resistance R is cut into five equal parts. These parts are then
connected in parallel. If the equivalent resistance of this combination is R′, then the
ratio R/R′ is -
(a) 1/25 (b) 1/5 (c) 5 (d) 25
2. Which of the following terms does not represent electrical power in a circuit?
(a) I
2R (b) IR2
(c) VI (d) V
2/R
3. An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the
power consumed will be -
(a) 100 W (b) 75 W (c) 50 W (d) 25 W
4. Two conducting wires of the same material and of equal lengths and equal diameters
are first connected in series and then parallel in a circuit across the same potential
difference. The ratio of heat produced in series and parallel combinations would be -
(a) 1:2 (b) 2:1 (c) 1:4 (d) 4:1

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