This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 33 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 33 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A straight wire carrying a 9.0 A current is in a uniform magnetic field oriented at right angles to the wire. When 75 cm of wire is in the field, the force on the wire is 1.2 N. What is the strength of the magnetic field (B)? A) = 0.18 N. B) = 0.18 T. C) = 0.18 Cm. D) = 0.18. Show Answer Correct Answer: B) = 0.18 T. 2. The unit of magnetic flux is A) Tesla (T). B) Weber (Wb). C) Henry (H). D) Ampere (A). Show Answer Correct Answer: B) Weber (Wb). 3. How can you increase the EMF induced in a wire? A) By using more coils of wire. B) By painting the wire. C) By using a longer wire. D) By using a thinner wire. Show Answer Correct Answer: A) By using more coils of wire. 4. Which of the following must change if there is to be an induced emf? A) The magnetic flux. B) The induced current. C) The resistance in the loop. D) The position of the loop in the magnetic field. Show Answer Correct Answer: A) The magnetic flux. 5. How does the electric field change as the magnet approaches the loop? A) The electric field increases. B) The electric field decreases. C) The electric field remains constant. D) The electric field fluctuates. Show Answer Correct Answer: A) The electric field increases. 6. Based on the observations you have made, what is Faraday's law? A) Faraday's law states that a change in magnetic field within a closed loop induces an electromotive force. B) Faraday's law states that electric current is the result of a magnetic field. C) Faraday's law states that magnetic fields are created by electric charges. D) Faraday's law states that electric fields are created by magnetic charges. Show Answer Correct Answer: A) Faraday's law states that a change in magnetic field within a closed loop induces an electromotive force. 7. What would happen if you broke a bar magnet into 8 pieces? A) You would have 8 half magnets. B) You would have 4 complete magnets. C) You would have 8 complete magnets. D) They wouldn't be magnets anymore. Show Answer Correct Answer: C) You would have 8 complete magnets. 8. A metallic wire having the length of 2 metre and weight of 4 x10-3 newton is found to remain at rest in a uniform and transverse magnetic field of 2x10-4 Tesla the current flowing through the wires A) 5A. B) 2A. C) 1A. D) 10A. Show Answer Correct Answer: D) 10A. 9. What is the unit of inductance and how is it calculated? A) Henry (H). B) Farad (F). C) Ohm ($\Omega$). D) Joule (J). Show Answer Correct Answer: A) Henry (H). 10. In general, how do the current and electric field relate to the change in magnetic flux? A) They are directly proportional. B) They are inversely proportional. C) They are unrelated. D) They are related through Faraday's law of induction. Show Answer Correct Answer: D) They are related through Faraday's law of induction. 11. Whenever there is a relative motion between a coil and a magnet, the magnitude of induced emf set up in the coil does not depend upon the A) Relative speed between coil and magnet. B) Magnetic moment of coil. C) Resistance of coil. D) Number of turns in the coil. Show Answer Correct Answer: C) Resistance of coil. 12. What happens to the induced electromotive force (emf) if the speed of the movement of a conductor in a magnetic field is doubled? A) The induced emf is halved. B) The induced emf remains the same. C) The induced emf is doubled. D) The induced emf is quadrupled. Show Answer Correct Answer: C) The induced emf is doubled. 13. A step-up transformer produces a 60 V a.c. output from a 12 V a.c. input. There are 50 turns on the secondary coil. How many turns are there on the primary coil? A) 5. B) 10. C) 50. D) 250. Show Answer Correct Answer: B) 10. 14. A permanent horseshoe magnet is mounted so that the magnetic field lines are vertical. If a student passes a straight wire between the poles and pulls it toward herself, the current flow through the wire is from right to left. Which is the north pole of the magnet? A) The north pole is to the right. B) The north pole is to the left. C) The north pole is at the Top. D) The north pole is at the bottom. Show Answer Correct Answer: D) The north pole is at the bottom. 15. When the coil of a generator is rotated at a rate of 5 Hz, the maximum EMF generated is 2.5 V. If the coil is now rotated at 10 Hz, the maximum EMF generated is: A) 2.5 V. B) 1.25V. C) 6.25V. D) 5.0V. Show Answer Correct Answer: D) 5.0V. 16. Phenomenon of generation of induced electromotive force and induced current a conductor as a result of the variation of the magnetic flux lines that intercepted by the conductor . A) Electromotive forces. B) Electromagnetic waves. C) Electromagnetic induction. D) Electromagnetic pollution. Show Answer Correct Answer: C) Electromagnetic induction. 17. What does electromagnetism mean? A) Electricity produces magnetism. B) Magnetism produces electricity. C) Electricity and magnetism are unrelated. D) Electricity is a form of magnetism. Show Answer Correct Answer: A) Electricity produces magnetism. 18. Mutual inductance between two coils depends on A) The current in the primary coil. B) The number of turns in both coils and the magnetic flux linkage. C) The resistance of the coils. D) The applied voltage. Show Answer Correct Answer: B) The number of turns in both coils and the magnetic flux linkage. 19. How can the direction of an induced potential be reversed? A) By changing the direction of the magnetic field. B) By using fewer coils. C) By moving the magnet faster. D) By changing the direction of the magnetic field, and moving the magnet in the opposite direction. Show Answer Correct Answer: A) By changing the direction of the magnetic field. 20. No EMF is induced when? A) When the wire is not moving. B) When the wire is parallel to magnetic field direction. C) When no lines are cut by the wire. D) All of the above. Show Answer Correct Answer: D) All of the above. 21. Which of the two and ammeter or voltmeter has a greater resistance A) Voltmeter. B) Ammeter. C) All the above. D) None of the above. Show Answer Correct Answer: A) Voltmeter. 22. When the number of coils in a magnet is increased, what happens to the magnitude of the current? A) Stays the same. B) Decreases. C) Increases. D) No effect. Show Answer Correct Answer: C) Increases. 23. What happens to the current in a coil while accelerating a magnet inside it? A) Increases. B) Decreases. C) Remains constant. D) Reverses. Show Answer Correct Answer: A) Increases. 24. What is the national grid? A) A power station. B) A network of wires/cables to distribute power around the country. C) A row of electrical transformers. D) None of the above. Show Answer Correct Answer: B) A network of wires/cables to distribute power around the country. 25. The coil in a d.c. motor is connected to a split-ring commutator. What is the purpose of the split-ring commutator? A) To ensure that the coil continues to rotate in the same direction. B) To ensure that the size of the current in the coil remains constant. C) To ensure that the size of the turning effect on the coil remains constant. D) To ensure that the turning effect on the coil changes direction. Show Answer Correct Answer: A) To ensure that the coil continues to rotate in the same direction. ← 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 10 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books