Current Electricity, Class 12 Physics MCQ Quiz Test

MCQ 1:
In the adjoining network of resistors, each is of resistance r ohm, the equivalent resistance between points A and B is

5r
2r/3
r
r/2

MCQ 2:
In the following figure, the ratio of current in 3 Ω and 1 Ω resistances is

1/3
2/3
1
2

MCQ 3:
The resultant resistance between the points A and B in the following diagram Fig. will be

4Ω
8Ω
6Ω
2Ω

MCQ 4:
Current in a conductor is due to

motion of free electrons in it
motion of (+) ve ions
free electrons and holes
protons

MCQ 5:
Specific resistance of a wire depends on the

length of the wire
area of cross–section of the wire
resistance of the wire
material of the wire

MCQ 6:
The resistance of some substances become zero at very low temperature , then these substances are called

good conductors
super conductors
bad conductors
semi conductors

MCQ 7:
The resistance of wire is 20Ω. The wire is stretched to three times its length. Then the resistance will now be

6.67Ω
60Ω
120Ω
180Ω

MCQ 8:
When the temperature of a metallic conductor is increased its resistance

always decreases
always increases
may increase or decrease
remains the same

MCQ 9:
Ohm's law deals with the relation between

current and potential difference
capacity and charge
capacity and potential
all are true

MCQ 10:
Net resistance between X and Y is

R
2R
R/2
4R

MCQ 11:
Net resistance between X and Y is -

4Ω
4.55Ω
2Ω
20Ω

MCQ 12:
The equivalent resistance between the terminal point P and Q is 4Ω in the given circuit, then find out the resistance of R in ohms

7
4
2
5

MCQ 13:
For following circuit the value of total resistance between X and Y in ohm is

R
4 R
5 R
6 R

MCQ 14:
When n identical resistances of value r each are connected in parallel, the equivalent resistance is x. The resultant resistance when they are connected in series is

nx
n² x
r.n.x
r² x/n

MCQ 15:
The effective resistance (in Ω) between (B) and (C) of letter (A) , containing resistance as shown in fig. as

60
40
80/3
160/9

MCQ 16:
Five identical resistance are connected as shown in fig. The equivalent resistance between point (A) and (B) is

R
5R
R/5
2R/5

MCQ 17:
In the following circuit the resultant emf (electromotive force) between AB is

E₁ + E₂ + E₃ + E₄
E₁ + E₂ + 2E₃ + E₄
E₁ + E₂ + (E₃/2) + E₄
E₁ + E₂ + (E₃/4) + E₄

MCQ 18:
The current (I) and voltage (V) graphs for a given metallic wire at two different temperature (T₁) and (T₂) are shown in fig. It is concluded that

T₁ > T₂
T₁ < T₂
T₁ = T₂
T₁ = 2T₂

MCQ 19:
In fig the equivalent resistance between points (x) and (y)

16Ω
14Ω
11Ω
18Ω

MCQ 20:
A 3 volt battery with negligible internal resistance is connected in a circuit as shown in the figure. The current I in the circuit will be

1.5 A
2 A
1/3 A
1 A

MCQ 21:
The current I drawn from the 5 volt source will be

0.67 A
0.17 A
0.33 A
0.5 A

MCQ 22:
The Kirchhoffs first law (Σi = 0) and second law (ΣiR = ΣE), where the symbols have usual meanings, are respectively based on

conservation of momentum, conservation of charge
conservation of charge, conservation of energy
conservation of charge, conservation of momentum
conservation of energy, conservation of charge

MCQ 23:
The equivalent resistance between points A and B of the circuit given below

5R
R/2
2R
R

MCQ 24:
A cylindrical wire is stretched to increase its length by 10%. The percentage increase in the resistance of the wire will be

20%
21%
22%
24%

MCQ 25:
The equivalent resistance between A and C is

2R/3
R/3
R
3R