MCQ Questions for Class 12 Physics Chapter 7 Alternating Current Part-1 with Answers

Alternating Current Part-1 Class 12 Physics MCQs Questions with Answers

Check the below NCERT MCQ Questions for Class 12 Physics Chapter 7 Alternating Current Part-1 with Answers Pdf free download. MCQ Questions for Class 12 Physics with Answers were prepared based on the latest exam pattern. We have Provided Alternating Current Part-1 Class 12 Physics MCQs Questions with Answers to help students understand the concept very well.

Class 12 Physics Chapter 7 Quiz

Class 12 Physics Chapter 7 MCQ Online Test

You can refer to NCERT Solutions for Class 12 Physics Chapter 7 Alternating Current Part-1 to revise the concepts in the syllabus effectively and improve your chances of securing high marks in your board exams.

Alternating Current Part-1 Class 12 Physics MCQ online test

Q1.	The average value of a cover a complete cycle is:
	A.l₀
	B.\(\frac{l_0}{2}\)
	C.\(\frac{l_0}{√2}\)
	D.zero

Ans: zero

Q2.	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

Ans: power lost in the circuit

Q3.	The dimensional formula of L/R is similar to that of:
	A.frequency
	B.time
	C.length
	D.none of these

Ans: time

Q4.	Which of the following has dimensions different from the rest?
	A.L/R
	B.\(\frac{1}{RC}\)
	C.\(\sqrt{LC}\)
	D.RC

Ans: \(\frac{1}{RC}\)

Q5.	The dimensional formula of impedance is;
	A.[ML²T^-2A^-2]
	B.[ML²T^-3A^-2]
	C.[ML²T^-2A^-1]
	D.[ML²T^-2A^-3]

Ans: [ML²T^-3A^-2]

Q6.	Energy dissipates in LCR circuit in :
	A.L only
	B.C only
	C.R only
	D.All of the above

Ans: R only

Q7.	An iron core transformer with a turns ratio of 8 : 1 has 120 V applied across the primary. The voltage across the
	A.15 V
	B.120 V
	C.180 V
	D.960 V

Ans: 15 V

Q8.	What is the ratio of inductive and capacitance reactances in an ac circuit?
	A.1
	B.ω²L
	C.ω²LC
	D.l

Ans: ω²LC

Q9.	An acceptor circuit is :
	A.series resonant circuit
	B.parallel resonant circuit
	C.LCR circuit
	D.None of these

Ans: series resonant circuit

Q10.	A broadcast circute broadcasts at 300 m band. A condenser of capacitance 2.4 lµF is available. The value of the inductance required for resonant circuit is:
	A.10^-4 H
	B.10^-8 H
	C.10^-6 H
	D.10^-2 H

Ans: 10^-8 H

Q11.	In series resonant circuit:
	A.reactance is zero
	B.current is zero
	C.voltage is zero
	D.None of these

Ans: None of these

Q12.	In parallel resonant circuit:
	A.impedance is very high
	B.current is very high
	C.voltage is very high
	D.None of these

Ans: impedance is very high

Q13.	The no. of turns in the primary coil of a transformer is 200 and the no. of turns in the secondary is 10. If 240 V a.c. is applied to primary, the output from the secondary
	A.6 V
	B.12 V
	C.24 V
	D.48 V

Ans: 12 V

Q14.	Transformer works on the principle of:
	A.convertor
	B.invertor
	C.mutual induction
	D.self-induction

Ans: mutual induction

Q15.	Which of the following effects is not shown in alternating current ?
	A.Chemical effect
	B.Magnetic effect
	C.Heating current
	D.All of these

Ans: Chemical effect

Q16.	An ac ammeter connected in series in an ac circuit reads 5A. The peak value of current:
	A.5 A
	B.5√2A
	C.\(\frac{5}{√5}\) A
	D.zero

Ans: 5√2A

Q17.	The phase difference b/w the A.C. and e.m.f. \(\frac{π}{2}\) Which of the following can not be the instituent of the circuit?
	A.LC
	B.L alone
	C.C alone
	D.RL

Ans: RL

Q18.	The Q factor of an LCR circuit at resonance is :
	A.\(\sqrt{R^2+ω^2L^2}\)
	B.\(\sqrt{R^2+(\frac{1}{cω}})^2\)
	C.\(\frac{ω_rL}{R}\)
	D.\(\sqrt{R^2+\frac{1}{c^2ω^2}}\)

Ans: \(\frac{ω_rL}{R}\)

Q19.	Faraday constant:
	A.depends on the amount of the electrolyte
	B.depends on the current in the electrolyte
	C.is a universal constant
	D.depends on the amount of charge passed through the electrolyte

Ans: is a universal constant

Q20.	The natural frequency of an L -C-Circuit is equal to :
	A.\(\frac{\sqrt{LC}}{2π}\)
	B.\(\frac{1}{3π\sqrt{LC}}\)
	C.\(\frac{1}{2π}\sqrt{\frac{L}{C}}\)
	D.\(\frac{1}{2π}\sqrt{\frac{C}{L}}\)