CBSE Class 12 Alternating Current Multiple Choice Questions with Answers. MCQ Questions Class 12 Alternating Current with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Alternating Current MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Alternating Current with Answers - Set - 2
Question 1:
The dimensional formula of L/R is similar to that of:
(a) frequency
(b) time
(c) length
(d) none of these
Correct Answer – (B)
Question 2 :
The average value of a cover a complete cycle is:
(a) l0
(b) l0/2
(c) l0/√2
(d) zero
Correct Answer – (D)
Question 3 :
For long distance transmission, the a.c. is stepped up because transmission at high voltage is:
(a) economical
(b) faster
(c) not dangerous
(d) not damped.
Correct Answer – (A)
Question 4 :
Transformers are used to
(a) step up d.c. voltage
(b) step up or step down a.c. voltage
(c) converts a.c. into d.c.
(d) converts d.c. in to a.c.
Correct Answer – (B)
Question 5 :
A choke coil should have:
(a) low resistance and high inductance
(b) low resistance and low inductance
(c) high resistance and high inductance
(d) high resistance and low inductance.
Correct Answer – (A)
MCQ Questions Class 12 Alternating Current with Answers
Question 6 :
Power factor of an ac circuit is a measure of:
(a) virtual power
(b) power lost in the circuit
(c) mean power
(d) all the above
Correct Answer – (B)
Question 7 :
An electric bulb rated 220 V is connected to 220 V, 5 Hz A.C. source. Then the bulb:
(a) glows continuously
(b) does not glow
(c) glows infermittantly
(d) fuses.
Correct Answer – (C)
Question 8 :
Which of the following phenomenon is helpful in the working f a choke coil?
(a) self induction
(b) mutual induction
(c) Eddy currents
(d) none of these.
Correct Answer – (A)
Question 9 :
Hot wire ammeters are used for measuring:
(a) a.c. only
(b) d.c. only
(c) neither a.c. nor d.c.
(d) both a.c. and d.c.
Correct Answer – (D)
Question 10 :
Which of the following does not decrease the efficiency of a transformer:
(a) laminating the core
(b) use of iron core
(c) core made of material having narrow hysteresis loop
(d) All of the above.
Correct Answer – (D)
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