CBSE - Electricity

1 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

2 Electricity Two wires each carrying current i are shown. The magnetic field at P (midway between the wires) is described by which statement?



(1) Magnetic fields are in opposite direction and net field is equal to zero.
(2) Magnetic fields due to two wires are in the same direction
(3) Magnetic fields are in opposite direct ion but net field is not zero
(4) magnetic fields are in the same direction and equal to two times the field due to one wire.

3 Electricity The value of equivalent resistance between the points A and B in the given circuit, will be –


(1) 6R
(2) 4R/11
(3) 11R/4
(4) R/6

4 Electricity The power of electric power station is 200 mega watt , the elect rical energy produced by it daily will be

(1) 200 megawatt hour
(2) 4800 megawatt hour
(3) 4800 megawatt
(4) 4800 joule

5 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

6 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

7 Electricity The unit of electrical energy is

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

8 Electricity Out of two bulbs 50 W – 220 V and 100 W –220 V, which one will glow brighter

(a) When connected in series

(b) When connected in parallel

(1) (a) 100 W, (b) 50 W
(2) (a) 50W, (b) 100 W
(3) (a) both will glow similar (b) 100 W
(4) none of t he above

9 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

10 Electricity 

An ammeter can read current upto 5 A and it has twenty divisions between the mark 0 and mark 2A on its scale

The least count of the ammeter is

(1) 0.02 A
(2) 0.01 A
(3) 0.2 A
(4) 0.1 A