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# 12th Physics - Electromagnetic Induction MCQ's with Solution

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

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### 12th Physics - Electromagnetic Induction MCQ's with Solution

1. 1. 9011041155 / 9011031155 • Live Webinars (online lectures) with recordings. • Online Query Solving • Online MCQ tests with detailed solutions • Online Notes and Solved Exercises • Career Counseling 1
2. 2. 9011041155 / 9011031155 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 2
3. 3. 9011041155 / 9011031155 (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 3
4. 4. 9011041155 / 9011031155 Solutions 1. (d) 25W 2. (b) 15Ω 4
5. 5. 9011041155 / 9011031155 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 5
6. 6. 9011041155 / 9011031155 5. (b) 40 Ω Form the impedance triangle, For an L-R circuit, 6
7. 7. 9011041155 / 9011031155 • Ask Your Doubts • For inquiry and registration, call 9011041155 / 9011031155. 7

May. 9, 2020

Jan. 5, 2016
• #### vignesh489

Jul. 18, 2015

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

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