CBSE - Electricity

1 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

2 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

3 Electricity 

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

4 Electricity A resistance wire of uniform cross section is in the form of a ring. The two diametrically opposite points are connected through a source of emf via an ammeter. A conducting wire is now connected across AB, A1 B3 & then A2B2 one by one .
If ammeter reads I1 , I2 & I3 respectively :

(1) I1 > I2 > I3
(2)  I3 = I1 > I2
(3) I1 = 0,  I2 > I3 
(4) I3 = 0, I1 < I2

5 Electricity A wire of resistance R is stretched to twice of its original length. Its new resistance will be :

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

6 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

7 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%

8 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

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

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

10 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