This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 1 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 1 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The following are applications of using electrical relay A) Industrial Automation. B) Lighting Systems. C) Elevators Control Systems. D) Electrical Heaters. E) All of the Above. Show Answer Correct Answer: E) All of the Above. 2. What does a moving charged particle experience if it moves through a static magnetic field? A) Nothing. B) An acceleration in the current direction. C) A deflection that is parallel to the magnetic field. D) A deflection that is perpendicular to both the magnetic field and the current. Show Answer Correct Answer: D) A deflection that is perpendicular to both the magnetic field and the current. 3. Emf is induced due to change in: A) Charge. B) Current. C) Magnetic Flux. D) Electric Flux. Show Answer Correct Answer: C) Magnetic Flux. 4. Electromotive force can be induced in a wire by A) Moving the wire near a magnet. B) Moving a magnet near the wire. C) Changing the current in a nearby wire. D) All of these. Show Answer Correct Answer: D) All of these. 5. If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed into a coil with twice the number of loops, A) Half as much voltage is induced. B) The same voltage is induced. C) Twice as much voltage is induced. D) Four times as much voltage is induced. Show Answer Correct Answer: C) Twice as much voltage is induced. 6. The scientics who first observed the phonomeonon of electromagnetic induction A) Faraday. B) Amper. C) Newton. D) Lenz. Show Answer Correct Answer: A) Faraday. 7. What is the direction of the induced current when the motion of the coil is at right angles to the magnetic field? A) Opposite to the magnetic field. B) Towards the magnetic field. C) No induced current is produced. D) Parallel to the magnetic field. Show Answer Correct Answer: A) Opposite to the magnetic field. 8. What is a transformer used for? A) Changing a direct current into an alternating current. B) Changing the magnitude of an alternating voltage. C) Reducing the frequency of an alternating current. D) Switching off the current in a circuit when there is a fault. Show Answer Correct Answer: B) Changing the magnitude of an alternating voltage. 9. A transformer actually transforms A) Voltage. B) Magnetic field lines. C) Generators into motors. D) None of the above. Show Answer Correct Answer: A) Voltage. 10. Which of these is NOT an appropriate non-verbal communication at work? A) Keeping hands in pockets while talking. B) Talking at moderate speed. C) Sitting straight. D) Tilting head a bit to listen. Show Answer Correct Answer: A) Keeping hands in pockets while talking. 11. What is the primary application of electromagnetic induction in generators? A) Converting mechanical energy to electrical energy. B) Converting electrical energy to mechanical energy. C) Storing electrical energy. D) Increasing resistance in circuits. Show Answer Correct Answer: A) Converting mechanical energy to electrical energy. 12. Which of the following equations represents the induced electromotive force (emf) in a coil? A) $E = mc^2$. B) $F = ma$. C) $\text{emf} =-N \frac{d\text{flux}}{dt}$. D) $V = IR$. Show Answer Correct Answer: C) $\text{emf} =-N \frac{d\text{flux}}{dt}$. 13. What is it called when you can use a magnetic field to create an electric current in a wire? A) Electromagnetic induction. B) Electromagnetic radiation. C) Electromagnetic conduction. D) Radio waves. Show Answer Correct Answer: A) Electromagnetic induction. 14. Two identical circular coils A and B are kept in a horizontal tube side by side without touching each other. If the current in coil A increases with time, in response, the coil B. A) Is attracted by A. B) Is attracted. C) Is repelled. D) Rotates. Show Answer Correct Answer: C) Is repelled. 15. To produce an induced emf, there must be a change in ..... A) Flux. B) Field. C) Area. D) Angle. E) Speed. Show Answer Correct Answer: A) Flux. 16. Sebuah dinamo menghasilkan tegangan sinusoidal dengan persamaan V = 100 sin 200t. Pernyataan berikut ini berhubungan dengan tegangan yang dihasilkan dinamo tersebut.1. Tegangan maksimum yang dihasilkan 100 V.2. Tegangan efektif yang dihasilkan 70, 7 V.3. Frekuensi tegangan adalah Hz. 4. Tegangan rata-rata yang dihasilkan V.Pernyataan di atas yang benar adalah ..... A) 2 dan 4. B) 1, 2, 3, dan 4. C) 1 dan 3. D) 4 saja. E) 1, 2, dan 3. Show Answer Correct Answer: E) 1, 2, dan 3. 17. Find out the expression for amperes Circuit law A) A. B) B. C) C. D) None of the above. Show Answer Correct Answer: B) B. 18. ..... Law says that a current produced by an induced emf moves in a direction so that its magnetic field opposes the original change in flux A) Lenz'. B) Faraday's. C) Ampere's. D) None of the above. Show Answer Correct Answer: A) Lenz'. 19. Discuss the applications of electromagnetic induction in everyday life. A) Generators, transformers, induction cooktops, MRI machines, metal detectors. B) Electric toothbrushes, Solar panels, Wind turbines. C) All the above. D) None of the above. Show Answer Correct Answer: A) Generators, transformers, induction cooktops, MRI machines, metal detectors. 20. How does the frequency of AC affect the operation of an AC generator? A) Higher frequency always results in lower voltage output. B) The frequency of AC has no impact on the generator's efficiency. C) AC frequency only affects the physical size of the generator. D) The frequency of AC affects the voltage output and power generation of an AC generator. Show Answer Correct Answer: D) The frequency of AC affects the voltage output and power generation of an AC generator. 21. What would happen if I move a bar magnet in and out of a coil of copper wire? A) Electric current would disappear. B) The magnet would explode. C) Electric current will flow through the wire. D) It would produce a gravitational field. Show Answer Correct Answer: C) Electric current will flow through the wire. 22. An $\alpha-$ $\times10^7$ $s^{-1}$ $\alpha-$ $\times10^{-19}$ $\alpha-$ A) 1.7 $\times10^{-27}kg$. B) 3.8 $\times10^{-27}kg$. C) 5.1 $\times10^{-27}kg$. D) 6.8 $\times10^{-27}kg$. Show Answer Correct Answer: C) 5.1 $\times10^{-27}kg$. 23. A 40.0-cm wire is moved perpendicularlythrough a magnetic field of 0.32 T with avelocity of 1.3 m/s. If this wire is connectedinto a circuit of 10.0 Ohm's resistance, what isthe current? A) 10 mA. B) 17 A. C) 17 mA. D) 10 A. Show Answer Correct Answer: C) 17 mA. 24. What causes the direction of the current to change? A) Change in voltage. B) Change in resistance. C) Change in magnetic field. D) Change in temperature. Show Answer Correct Answer: C) Change in magnetic field. 25. AP Physics Electromagnetic Induction A) The first electromagnet has a more powerful current than the second. B) The first electromagnet has a less powerful current than the second. C) The currents in the two electromagnets run in opposite directions. D) The current in the first electromagnet moves faster than the current in the second electromagnet. Show Answer Correct Answer: A) The first electromagnet has a more powerful current than the second. 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