This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 10 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 10 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. An e.m.f. is induced across a wire when it moves through the magnetic field between the poles ofa magnet.Which electrical device operates because of this effect? A) A battery. B) A cathode-ray tube. C) A generator. D) A motor. Show Answer Correct Answer: C) A generator. 2. What is the function of the split-ring commutator in an electric motor with a single rotating coil? A) To enable the motor to function with an a.c. source. B) To reverse the current in the coil once every revolution. C) To reverse the current in the coil whenever its plane becomes perpendicular to the magnetic field. D) To reverse the current in the coil whenever its plane is parallel with the magnetic field. Show Answer Correct Answer: C) To reverse the current in the coil whenever its plane becomes perpendicular to the magnetic field. 3. How does an electric motor function? A) A current running through a coil generates a magnetic field which pushes on a pole of a magnet. B) A moving magnet moves through a coil of wire to generate a voltage. C) A combustion reaction expels gas in the opposite direction of the motors acceleration. D) None of the above. Show Answer Correct Answer: A) A current running through a coil generates a magnetic field which pushes on a pole of a magnet. 4. The coil has a self inductance of 0.08 Henry find the magnitude of the EMF induced in that when the current flowing through it is the changing at the rate 120A/s A) -6V. B) 6V. C) -9.7v. D) -9.6V. Show Answer Correct Answer: D) -9.6V. 5. What does Lenz's law state about the direction of induced current? A) It opposes the change in magnetic flux. B) It enhances the change in magnetic flux. C) It is always clockwise. D) It is always counterclockwise. Show Answer Correct Answer: A) It opposes the change in magnetic flux. 6. A device in which Mechanical Energy is used to create Electrical Energy A) Generator. B) Motor. C) Magnet. D) Transformer. Show Answer Correct Answer: A) Generator. 7. Type question here incl A straight wire is held perpendicular to a uniform magnetic field. If the current in the wire increases, what will happen to the magnitude of the force on the wire? A) It will increase. B) It will decrease. C) It will remain the same. D) None of the above. Show Answer Correct Answer: A) It will increase. 8. Provide the correct statements.1. EMF self-induction occurs when passing through a DC coil;2. Self-induction EMF occurs when passing through an AC coil;3. EMF self-induction counteracts current flow;4. EMF self-induction counteracts current changes. A) 2 & 3;. B) 2 & 4;. C) 1 &3. D) 1 & 4. Show Answer Correct Answer: B) 2 & 4;. 9. Which rule can be used to determine the direction of the induced current produced. A) Fleming's Left Hand Rule. B) Fleming's Right Hand Rule. C) Right Hand Grip Rule. D) None of the above. Show Answer Correct Answer: B) Fleming's Right Hand Rule. 10. Click Reverse. How does this affect the direction of the current? A) The current direction remains the same. B) The current direction reverses. C) The current stops. D) The current increases. Show Answer Correct Answer: B) The current direction reverses. 11. For a coil with N turns, the ..... is defined as the product of the magnetic flux and N. A) Magnetic Flux Density. B) Magnetic Flux. C) Magnetic Flux Linkage. D) Magnetic Field. Show Answer Correct Answer: C) Magnetic Flux Linkage. 12. What is the significance of the left side of a coil in terms of magnetic polarity? A) The left side of a coil is always the south pole regardless of current direction. B) The left side of a coil can be designated as the north pole when current flows in a specific direction, based on the right-hand rule. C) The left side of a coil has no magnetic polarity. D) The left side of a coil is neutral and does not affect magnetic fields. Show Answer Correct Answer: B) The left side of a coil can be designated as the north pole when current flows in a specific direction, based on the right-hand rule. 13. What is the function of slip rings in an AC generator? A) The function of slip rings in an AC generator is to provide a continuous electrical connection between the rotating coil and the external circuit. B) To convert AC to DC within the generator. C) To support the weight of the generator's rotor. D) To increase the voltage output of the generator. Show Answer Correct Answer: A) The function of slip rings in an AC generator is to provide a continuous electrical connection between the rotating coil and the external circuit. 14. Experiment:Turn on Show magnetic field. Position the loop over the magnet. Click Play. What do you notice? A) The loop starts to rotate. B) The loop remains stationary. C) The loop changes color. D) The loop disappears. Show Answer Correct Answer: A) The loop starts to rotate. 15. What is the difference between AC and DC in terms of generation? A) AC is generated by batteries with a constant direction. B) DC is generated by alternators with periodic direction change. C) AC is generated by solar panels with a constant direction. D) AC is generated by alternators with periodic direction change, while DC is generated by batteries with a constant direction. Show Answer Correct Answer: D) AC is generated by alternators with periodic direction change, while DC is generated by batteries with a constant direction. 16. In an experiment, a coil is moved through a magnetic field. What is observed? A) A current is induced in the coil. B) The coil heats up. C) The coil becomes magnetized. D) Nothing happens. Show Answer Correct Answer: A) A current is induced in the coil. 17. In which device is the magnetic effect of a current not used? A) Electromagnet. B) Loudspeaker. C) Potential divider. D) Relay. Show Answer Correct Answer: C) Potential divider. 18. Can you produce current in a stationary wire with a magnet that is not moving? A) Yes, having a magnet near a wire is enough to produce current in a wire. B) No, the magnetic field has to be changing to produce current in a wire. C) No, magnets cannot produce current in a wire. D) None of the above. Show Answer Correct Answer: B) No, the magnetic field has to be changing to produce current in a wire. 19. A student is experimenting with EM induction using a small magnet and a coil. Which of the following can increase the e.m.f. induced? A) Move magnet slower. B) Use coil with more turns. C) Use coil with smaller resistance. D) Use a weaker magnet. Show Answer Correct Answer: B) Use coil with more turns. 20. Primary winding of a transformer is determined by ..... A) Which winding has more turns. B) Which winding is nearer to the load. C) Which winding is connected to the source. D) Which side has the highest voltage. Show Answer Correct Answer: C) Which winding is connected to the source. 21. What does the term 'mutual inductance' refer to? A) Inductance between two coils. B) Inductance due to a magnetic field. C) Inductance of a single coil. D) Inductance in a closed loop. Show Answer Correct Answer: A) Inductance between two coils. 22. When a charged particle moves through a magnetic field, it experiences a force parallel to both its velocity and the direction of the magnetic field. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 23. Primary winding:400 turnsSecondary winding:200 turnsIf there are 240V and 8A on the primary, the secondary will have ..... A) 240V at 4A. B) 120V at 4A. C) 240V at 16A. D) 120V at 16A. Show Answer Correct Answer: D) 120V at 16A. 24. Which of the following devices operates on the principle of electromagnetic induction? A) Battery. B) Transformer. C) Solar panel. D) Resistor. Show Answer Correct Answer: B) Transformer. 25. By increasing the number of turns in a coil, the current in the wire A) Decreases. B) Remains the same. C) Becomes zero. D) Increases. Show Answer Correct Answer: D) Increases. ← PreviousNext →Related QuizzesClass 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 1Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 2Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 3Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 4Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 5Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 6Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 7Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 8Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 9Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books