MCQs with solutions of Alternating current for NEET/JEE & 12th boards

BEST MCQ TYPE QUESTIONS ON THE TOPIC ALTERNATING CURRENT
(PHYSICS) FOR NEET,JEE & BOARDS WITH SOLUTIONS (PART 2)
TOTAL QUESTIONS 15



Q1. The reactance of a 25 𝜇F capacitor at the ac frequency of 4000 Hz is

(a) 5/𝜋 ohm (b) √ 5/𝜋 ohm (c) 10 ohm (d) √10 ohm

Q2. The frequency for which a 5 𝜇F capacitor has a reactance of 1/1000 ohm is
given by

(a) 100 /𝜋 MHz (b) 1000/𝜋 Hz (c) 1/1000 Hz (d) 1000 Hz

Q3. An alternating e.m.f. is applied to purely capacitive circuit. The phase
relation between e.m.f. and current flowing in the circuit is or In a circuit
containing capacitance only

(a) e.m.f. is ahead of current by 𝜋/2 (b) Current is ahead of e.m.f. by 𝜋/2
(c) Current lags behind e.m.f. by 𝜋 (d) Current is ahead of e.m.f. by 𝜋

Q4. An e.m.f. 𝐸 = 4 𝑐os(1000𝑡) volt is applied to an 𝐿R −circuit of inductance 3
mH and resistance 4 ohms. The amplitude of current in the circuit is

(a) 4/ √7 A (b) 1.0 𝐴 (c) 4/ 7 A (d) 0.8 A

Q5. A capacitor has a capacitance of 1/𝜋 𝜇F. Find the reactance for a frequency
of

(i) 50 Hz (ii) And 106 Hz

Q6. A pure inductance of 1.0 𝐻 is connected across a 110 𝑉, 70 𝐻z source. Find
the

(a) reactance, (b) current, and (c) peak value of current.