Alternating Current Quiz – JEE Main 2026 | 10 PYQ MCQ & Numericals
Alternating Current – JEE Main 2026 Quiz
10 Questions | MCQ + Numerical | Instant Result
Q1.
A step-down transformer receives 2.3 kV input. Primary current is 5 A and efficiency is 90%. Output voltage is 230 V. Output current (A) is:
Correct Answer:
45
Q2.
An alternating current is given by I = I
A
sinωt + I
B
cosωt. The RMS current is:
√(I
A
² + I
B
²) / 2
√[(I
A
² + I
B
²)/2]
|I
A
+ I
B
| / √2
√(I
A
² + I
B
²)
Q3.
A coil has inductance 2 H and resistance 4 Ω. A 10 V DC source is applied. Energy stored after steady state is ______ × 10⁻² J.
Correct Answer:
625
Q4.
An AC voltage V = 260 sin(628t) is applied across a pure inductor of 5 mH. Inductive reactance is:
6.28 Ω
0.318 Ω
0.5 Ω
3.14 Ω
Q5.
In an LCR series circuit, L = 0.5 mH, C = 20 μF and R = 20 Ω. At resonance, amplitude of current is √x A. Find x.
Correct Answer:
242
Q6.
A capacitor of 200 pF is connected to 230 V AC supply of angular frequency 300 rad/s. RMS conduction current and displacement current respectively are:
14.3 μA and 143 μA
13.8 μA and 13.8 μA
13.8 μA and 138 μA
1.38 μA and 13.8 μA
Q7.
In an AC circuit, V = 100 sin(100t) V and I = 100 sin(100t + π/3) mA. Average power dissipated is:
5 W
25 W
2.5 W
10 W
Q8.
An alternating emf E = 440 sin(100πt) is applied to an inductor of √2/π H. AC ammeter reading (A) is:
4.4 A
1.55 A
2.2 A
3.11 A
Q9.
An ideal transformer supplies power to houses at 120 V. Average power consumption is 60 kW. Equivalent resistive load in secondary (mΩ) is:
Correct Answer:
240
Q10.
AC of amplitude 40 V and frequency 4 kHz is applied to a capacitor of 12 μF. Maximum displacement current is:
10 A
8 A
13 A
12 A
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