CBSE - Electricity

1 Electricity A comb run through one's dry hair attracts small bits of paper. This is due to :

(1) comb is a good conductor

(2) paper is a good conductor

(3) The atoms in the paper gets polarised by the charged comb

(4) the comb possesses magnetic properties

2 Electricity A certain household has consumed 200 units of energy during a month. Its value in joules will be -

(1) 3.6 × 10¹⁰
(2) 7.2 × 10¹⁰
(3) 3.6 × 10⁸
(4) 7.2 × 10⁸

3 Electricity Suppose five resistances, each of 10 ohm, are provided t o you. You are free to get the desired value by combining them. The desired value will lie in between

(1) 2 ohm to 50 ohm
(2) 20 ohm to 40 ohm
(3) 12 ohm to 50 ohm
(4) 10 ohm to 60 ohm

4 Electricity Alloys are commonly used in electrical heat ing devices, like electric iron etc. because -

(1) Alloys have higher resistivity than that of its constituent metals.
(2) Alloys do not burn at higher temperatures.
(3) Alloys do not oxidise at higher temperatures.
(4) All of above.

5 Electricity What is the equivalent resistance of the following arrangement between M and N



(1) R/2
(2) R/3
(3) R/4
(4) R/6

6 Electricity When 1 J of work is done to move a charge of 1 C from one point to another point then the potential difference between two points in a given circuit will be-

(1) 1 V
(2) 4V
(3) 8 V
(4) zero

7 Electricity 

In an experiment on finding equivalent resistance of two resistors in series, four students draw up circuits - which oneis correct ?

8 Electricity The device used for measuring electric current is

(1) generator
(2) galvanometer
(3) ammeter
(4) motor

9 Electricity One Volt is equal to -

(1) 1 Joule
(2) 1 Newton/Coulomb
(3) 1 Joule/Coulomb
(4) 1 Coulomb/Newton

10 Electricity Out of two bulbs 50W - 220 V and 100W-220V, which one will glow brighter if

(a) connected in series (b) when connected in parallel

(1) (a) 50 W (b) 100 W
(2) (a) 100 W (b) 100 W
(3) (a) 100 W (b) 50 W
(4) none of the above