12th Physics - Electromagnetic Induction MCQ's with Solution by ednexa.com

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Electromagnetic Induction
Multiple Choice questions
1. In an A.C. circuit E = 100 sin(500t) volt and
I = 1000
. The power dissipated in
the circuit is
(a) 10W
(b) 100W
(c) 50W
(d) 25W
2. An L-C-R series circuit is joined to a source of
alternating e.m.f. If R=9Ω, XL=28Ω, XC=16Ω, then
the impendence of the circuit will be
(a) 10Ω
(b) 15Ω
(c) 20Ω
(d) 30Ω
3. A current I=3 sin ωt ampere flows through a bulb.
The P.D. across the bulb is given by V=4cosωt
volt. The power dissipated in the bulb is
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(a) 12W
(b) 6W
(c) Zero W
4. An inductance of
(d) 3W
henry and a resistance of
30Ω are joined in series. If an alternating e.m.f. of
200V, 50Hz is applied to their combination, then
the impedance of the circuit will be
(a) 50 Ω
(b) 40 Ω
(c) 100 Ω
(d) 10 Ω
5. In an A.C. circuit, a resistance R=40Ω and an
inductance L are connected in series. If the phase
angle between voltage and current is 45º, then
the value of the inductive reactance will be
(a) 20 Ω
(b) 40 Ω
(c) 10 Ω
(d) 50 Ω
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Solutions
1.
(d) 25W
2.
(b) 15Ω
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3.
(c) Zero W
∴ The phase difference between I and V is
∴ Power consumed in the circuit is zero
4. (a) 50 Ω
When L and R are joined in series, the
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5. (b) 40 Ω
Form the impedance triangle,
For an L-R circuit,
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