CBSE - Electricity

1 Electricity The device used for measuring electric current is

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

2 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

3 Electricity It is written 100 watt-250 volt on any bulb. Its resistance will be

(1) 25000 ohm
(2) 625 ohm
(3) 25 ohm
(4) 2.5 ohm

4 Electricity In house electrical circuit s the fuse wire for safety should be of
(1) High resistance - high melting point
(2) Low resistance - high melting point
(3) Low resistance - low melting point
(4) High resistance - low melting point

5 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

6 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

7 Electricity What is the resistance between the points A and B ?

1) 3/2 Ω
2) 2/3 Ω
3) 1/2 Ω
4) 2 Ω

8 Electricity The unit of electrical energy is

(1) watt
(2) killowatt
(3) kilowatt per hour
(4) kilowatt hour

9 Electricity Which country is called the country of Wind mills ?

(1) Holland
(2) Britain
(3) India
(4) America

10 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.