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 - 4
Question 1:
E.M.F. is measured in :
(a) joule
(b) joule/coulomb
(c) joule-coulombs
(d) joule/coulomb/metre
Correct Answer – (B)
Question 2 :
Ohm’s law is valid when the temperature of conductor is :
(a) very low
(b) very high
(c) varying
(d) constant
Correct Answer – (D)
Question 3 :
Why is the Wheatstone bridge more accurate than other methods of measuring resistances: ‘
(a) It is a null method
(b) It is based on Kirchhoffs laws
(c) It has four resistances
(d) It does not involve ohm’s law
Correct Answer – (A)
Question 4 :
When three identical bulbs of 60 W, 200 V rating are connected in series to a 200 V supply, the power drawn by them will be:
(a) 20 W
(b) 60 W
(c) 180 W
(d) 10 W
Correct Answer – (A)
Question 5 :
The length and radius of an electric resistance of a certain wire are doubled simultaneously, then the:
(a) resistance will be doubled and specific resistance will be halved
(b) resistance will be halved and specific resistance will remain uncharged
(c) resistance will be halved and the specific resistance will be doubled
(d) resistance and specific resistance will both remain uncharged
Correct Answer – (B)
MCQ Questions Class 12 Current Electricity with Answers
Question 6 :
The emf of a car battery is about:
(a) 2.5 V
(b) 4.5 V
(c) 8.6 V
(d) 12 V
Correct Answer – (D)
Question 7 :
A potential difference of 10 V is applied across a conductance of 2 S. The current in the conductor will be :
(a) 20 A
(b) 5 A
(c) 0.2 A
(d) None of these
Correct Answer – (A)
Question 8 :
n resistances, each of R Ω, are connected in parallel gives an equivalent resistance of R Ω. If these resistances were , connected in series, the combination would have a resistance in Ω is equal to
(a) n²R
(b) R/n²
(c) R/n
(d) nR
Correct Answer – (A)
Question 9 :
A galvanometer acting as a volt meter will have with its coil.
(a) a high resistance in parallel
(b) a high resistance in series
(c) a low resistance in parallel
(d) a low resistance in series
Correct Answer – (B)
Question 10 :
A 5 A fuse wire can with stand a maximum power of 1 W in circuit. The resistance of the fuse wire is:
(a) 0.2 Ω
(b) 5 Ω
(c) 0.4 Ω
(d) 0.04 Ω
Correct Answer – (D)
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