CBSE Class 12 Current Electricity Multiple Choice Questions with Answers. MCQ Questions Class 12 Current Electricity with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Current Electricity MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Current Electricity with Answers - Set - 1
Question 1:
The heating element of an electric heater should be made of a material that should have:
(a) low specific resistance and low melting point.
(b) high specific resistance and high melting point.
(c) high specific resistance and low melting point.
(d) low specific resistance and high melting point.
Correct Answer – (B)
Question 2 :
Three equal registers connected in series across a source of e.m.f. together dissipate 10 watts of power. What would be the power dissipated if the same resistors are connected in parallel across the same source of e.m.f.?
(a) 9 watts
(b) 90 watts
(c) 10 watts
(d) 100 watts
Correct Answer – (B)
Question 3 :
In 10 minutes, 3000 Coulombs of free electrons enter one end of a conductor and 3000 Coulomb of then leave the conductor at its other end. The current in the conductor is:
(a) 5 A
(b) 10 A
(c) 0 A
(d) 30 A
Correct Answer – (A)
Question 4 :
A cell of e.m.f. ‘E’ and internal resistance r is connected in series with an external resistance nr. Then the ratio of the terminal potential difference to e.m.f. is
(a) 1/n
(b) 1/(n + 1)
(c) n/(n + 1)
(d) (n + 1)/n
Correct Answer – (C)
Question 5 :
When there is an electric current through a conducting wire along its length, then an electric field must exist:
(a) outside the wire but normal to it.
(b) inside the wire but parallel to it.
(c) inside the wire but normal to it.
(d) outside the wire but around it.
Correct Answer – (B)
MCQ Questions Class 12 Current Electricity with Answers
Question 6 :
The temperature coefficient of resistance of a wire is 0.00125° C-1. At 27°C, its resistance is 1Ω. The temperature of the wire at which its resistance becomes 2Ω is:
(a) 1400 K
(b) 854°C
(c) 1127 K
(d) 1154 K.
Correct Answer – (B)
Question 7 :
(a) v/2
(b) v
(c) 2v
(d) √2 v
Correct Answer – (A)
Question 8 :
For which of the following dependence of drift velocity electric field E is Ohm’s law obeyed.
(a) vd < √E
(b) vd ∝ E
(c) vd ∝ E²
(d) vd = constant
Correct Answer – (B)
Question 9 :
(a) zero
(b) E
(b) E/2
(b) E/3
Correct Answer – (A)
Question 10 :
Kirchhoff s second law is based on the law of conservation of
(a) charge
(b) mass
(c) energy
(d) momentum
Correct Answer – (C)
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