This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Physics Part I > 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 (60 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) Current. B) Electric Flux. C) Charge. D) Magnetic Flux. Show Answer Correct Answer: D) 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) Four times as much voltage is induced. B) Half as much voltage is induced. C) The same voltage is induced. D) Twice as much voltage is induced. Show Answer Correct Answer: D) Twice as much voltage is induced. 6. The scientics who first observed the phonomeonon of electromagnetic induction A) Amper. B) Lenz. C) Newton. D) Faraday. Show Answer Correct Answer: D) 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) Reducing the frequency of an alternating current. B) Switching off the current in a circuit when there is a fault. C) Changing the magnitude of an alternating voltage. D) Changing a direct current into an alternating current. Show Answer Correct Answer: C) 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) Storing electrical energy. C) Increasing resistance in circuits. D) Converting electrical energy to mechanical energy. 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) $V = IR$. D) $\text{emf} =-N \frac{d\text{flux}}{dt}$. Show Answer Correct Answer: D) $\text{emf} =-N \frac{d\text{flux}}{dt}$. 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. B) Rotates. C) Is attracted by A. D) Is repelled. Show Answer Correct Answer: D) Is repelled. 15. To produce an induced emf, there must be a change in ..... A) Area. B) Angle. C) Speed. D) Flux. E) Field. Show Answer Correct Answer: D) 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) 1, 2, dan 3. B) 1 dan 3. C) 1, 2, 3, dan 4. D) 4 saja. E) 2 dan 4. Show Answer Correct Answer: A) 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) The magnet would explode. B) It would produce a gravitational field. C) Electric current would disappear. D) Electric current will flow through the wire. Show Answer Correct Answer: D) 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) 6.8 $\times10^{-27}kg$. C) 5.1 $\times10^{-27}kg$. D) 3.8 $\times10^{-27}kg$. 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) 17 A. B) 17 mA. C) 10 mA. D) 10 A. Show Answer Correct Answer: B) 17 mA. 24. What causes the direction of the current to change? A) Change in magnetic field. B) Change in voltage. C) Change in temperature. D) Change in resistance. Show Answer Correct Answer: A) Change in magnetic field. 25. AP Physics Electromagnetic Induction A) The first electromagnet has a less powerful current than the second. B) The currents in the two electromagnets run in opposite directions. C) The current in the first electromagnet moves faster than the current in the second electromagnet. D) The first electromagnet has a more powerful current than the second. Show Answer Correct Answer: D) The first electromagnet has a more powerful current than the second. 26. The energy stored in an inductor is given by A) U=1/2IR. B) U=1/2 QV. C) U=1/2 LI$^{2}$. D) U=1/2 CV$^{2}$. Show Answer Correct Answer: C) U=1/2 LI$^{2}$. 27. Eddy currents are induced when A) A coil is kept in a uniform magnetic field. B) Current is passed in a coil. C) A metal block is kept in a uniform magnetic field. D) A metal block is kept in a changing magnetic field. Show Answer Correct Answer: D) A metal block is kept in a changing magnetic field. 28. In an experiment, a coil is moved rapidly through a magnetic field. What is the observed effect? A) The coil becomes magnetized. B) The coil heats up. C) The coil changes color. D) An electric current is induced in the coil. Show Answer Correct Answer: D) An electric current is induced in the coil. 29. A metallic rod CD rest on a thick metallic wire pqrs with arms PQ and RS are parallel to each other at a distance of l equal to 50 cm as shown in the figure. A uniform magnetic field B=0.2T ad perpendicular to the plane of the paper pointing in words. The rod is now made to slide towards right with a constant velocity v =6.0 m/s. A) 0.2V. B) 0.4V. C) 0.7V. D) 0.6V. Show Answer Correct Answer: D) 0.6V. 30. If there is no relative motion between the magnetic field and the conductor, there is no current induced. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 31. The process of generating the current in a conductor is called as A) Electromagnetic induction. B) Electro motive force. C) Induced voltage. D) Generator energy conversion. Show Answer Correct Answer: A) Electromagnetic induction. 32. A moving magnetic field will produce the same effect as a conductor that is moving A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 33. A coil of inductance 2 Hhas a current of 5.8 A. The flux in weber through the coil is- A) 11.6. B) 2.9. C) 0.29. D) 3.12. Show Answer Correct Answer: A) 11.6. 34. A step-down transformer is 100% efficient. It has an input voltage of 240 V a.c. and an output voltage of 60 V a.c. The current in the primary coil is 0.50 A. What is the current in the secondary coil? A) 2.0 A. B) 0.13 A. C) 0.50 A. D) 8.0 A. Show Answer Correct Answer: A) 2.0 A. 35. Ratio of voltages is equal to ratio of A) Iron sheets in core. B) Coil. C) Number of turns in coil. D) All of above. Show Answer Correct Answer: C) Number of turns in coil. 36. An element is known to have 35 nucleon and 12 electrons. It has the charge +3 Determine the most possible composition of its nucleus! A) 20 neutrons, 15 protons. B) 23 neutrons, 12 protons. C) 20 neutrons, 12 protons. D) 23 neutrons, 12 electrons. Show Answer Correct Answer: A) 20 neutrons, 15 protons. 37. What is step-down transformer? A) A step-down transformer is a device that decreases voltage and increases current. B) A step-down transformer is a device that only increases voltage. C) A step-down transformer is used to convert AC to DC. D) A step-down transformer increases voltage and decreases current. Show Answer Correct Answer: A) A step-down transformer is a device that decreases voltage and increases current. 38. A long solenoid with 15turns per cm has a small loop of area 2cm$^{2}$ placed inside normal to the axis of the solenoid. The current carried by the solenoid changes steadily from 2A to 4A in 0.1second.What is the induced emf in the loop while current is changing. A) 7.5*10$^{6}$V. B) 7.5*10$^{-6}$V. C) 2.5V. D) 7.5V. Show Answer Correct Answer: B) 7.5*10$^{-6}$V. 39. Choose the best definition for magnetic field. A) A force that attracts all objects towards the Earth. B) A region where only electric charges can be observed. C) A region around a magnetic material or moving electric charge where magnetic forces can be observed. D) A type of energy that is emitted by all materials. Show Answer Correct Answer: C) A region around a magnetic material or moving electric charge where magnetic forces can be observed. 40. Observe:Move the wire loop down, towards the magnet. In which direction is the current moving? A) Downwards. B) Upwards. C) Clockwise. D) Counterclockwise. Show Answer Correct Answer: C) Clockwise. 41. Observe:Check that Show loop data is on. Move the wire loop up, away from the magnet. Is the magnetic flux increasing or decreasing as you do this? A) Increasing. B) Decreasing. C) No change. D) Fluctuating. E) Constant. Show Answer Correct Answer: B) Decreasing. 42. Faraday's Law states that A) The magnitude of induced e.m.f is directly proportional to the the rate of cutting of the magnetic field. B) The magnitude of induced e.m.f is inversely proportional to the the rate of cutting of the magnetic field. C) The direction of induced e.m.f is inversely proportional to the the rate of cutting of the magnetic field. D) The direction of induced e.m.f is directly proportional to the the rate of cutting of the magnetic field. Show Answer Correct Answer: A) The magnitude of induced e.m.f is directly proportional to the the rate of cutting of the magnetic field. 43. How can electromagnetic induction be used in power generation? A) Storing energy in batteries for later use. B) Using solar panels to capture sunlight directly. C) Electromagnetic induction is used in power generation by rotating a coil in a magnetic field to induce electric current. D) Burning fossil fuels to generate heat for electricity. Show Answer Correct Answer: C) Electromagnetic induction is used in power generation by rotating a coil in a magnetic field to induce electric current. 44. How can an electromagnet be helpful in a junkyard? A) It can help the workers move around the yard. B) It can move heavy pieces of metal. C) It can send out voltage waves. D) It can covert electrical energy into mechanical energy. Show Answer Correct Answer: B) It can move heavy pieces of metal. 45. The strength of an electromagnet decreases when you increase the current. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 46. What is meant by a step down transformer? A) One where the output voltage is the same as the input voltage. B) One where the output voltage is larger than the input voltage. C) One where the output voltage is smaller than the input voltage. D) None of the above. Show Answer Correct Answer: C) One where the output voltage is smaller than the input voltage. 47. Which is an interaction that is not mediated by an electric field? A) Electric interactions. B) Magnetic interactions. C) All the above. D) None of the above. Show Answer Correct Answer: B) Magnetic interactions. 48. Back e.m.f. is induced in a spinning electric motor. Which statement about the back e.m.f is NOT true? A) Its magnitude is bigger when the motor starts to spin. B) Its direction is opposite to the direction of the voltage supplied. C) It is generated when an armature coil undergoes a magnetic flux change. D) It reduces the electric power supplied to the motor. Show Answer Correct Answer: A) Its magnitude is bigger when the motor starts to spin. 49. The induced emf in a coil of 10 henry inductance in which current varies from 9 A to 4 A in 0.2 second is A) 200 V. B) 350 V. C) 300 V. D) 250 V. Show Answer Correct Answer: D) 250 V. 50. The source of all magnetism is A) Tiny pieces of iron. B) Tiny domains of aligned atoms. C) Moving electric charge. D) None of the above. Show Answer Correct Answer: B) Tiny domains of aligned atoms. 51. The direction of the induced field can be predicted by ..... A) Lenz's law. B) Kepler's law. C) Faraday's law. D) Newton's law. Show Answer Correct Answer: A) Lenz's law. 52. Which of the following is the correct unit for permeability of free space? A) Tesla. B) Tesla metre Ampere. C) Tesla metre per Ampere. D) Tesla per metre per Ampere. Show Answer Correct Answer: C) Tesla metre per Ampere. 53. What happen to the magnetic flux if the magnetic field intensity increases? A) The magnetic flux becomes zero. B) The magnetic flux increases. C) The magnetic flux remains constant. D) The magnetic flux decreases. Show Answer Correct Answer: B) The magnetic flux increases. 54. Voltage 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. E) None of these. Show Answer Correct Answer: D) All of these. 55. There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then A) Ac is induced in the loop. B) Current is induced in the loop in the anti-clockwise direction. C) No current is induced in the loop. D) Current is induced in the loop in the clockwise direction. Show Answer Correct Answer: B) Current is induced in the loop in the anti-clockwise direction. 56. What does a step-down transformer do? A) Decreases voltage and increases current. B) Increases voltage and decreases current. C) Keeps the voltage and the current the same. D) None of the above. Show Answer Correct Answer: A) Decreases voltage and increases current. 57. A solenoid L and resistance R are connected in series to a battery through a switch when the switch is put on the current I is flowing through it varies with time as shown in the figure that is graph is given below A) C. B) B. C) D. D) A. Show Answer Correct Answer: B) B. 58. Induction that occurs to the same conductor in which current changes is called ..... A) Selfish induction. B) Multiple induction. C) Mutual induction. D) Self induction. Show Answer Correct Answer: D) Self induction. 59. Electricity can be generated by rotating a wire loop between the poles of a magnet. Which of the following arrangements will induce the largest current in the loop? A) The induced current is the same in all positions of the loop. B) The plane of the loop is parallel to the magnetic field. C) The plane of the loop is perpendicular to the magnetic field. D) The plane of the loop makes an angle of 45$^\circ$ with the magnetic field. Show Answer Correct Answer: B) The plane of the loop is parallel to the magnetic field. 60. Experiment:Click Reverse and observe the electric field as the magnet moves away. How does changing the direction of the magnet affect the electric field? A) It has no effect on the electric field. B) It increases the strength of the electric field. C) It reverses the direction of the electric field. D) It decreases the strength of the electric field. Show Answer Correct Answer: C) It reverses the direction of the electric field. 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