CBSE - Electricity

1 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

2 Electricity  An AC generator is connected to an electric appliance. In 10 revolutions of the armature the current in the appliance changes direction :

(1) 5 times
(2) 10 times
(3) 20 times
(4) 40 times

3 Electricity If current through a resistance is increased by 100% simultaneously reducing resistance value to 25%, the new power
dissipated will be
(1) No change
(2) Increased by 100%
(3) Decreased by 400%
(4) Increased by 400%

4 Electricity 

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

5 Electricity The device used for measuring electric current is

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

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 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.

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 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

10 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