This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 7 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 7 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Electromagnetic induction is ..... A) The process in which a current produces a magnetic field. B) The process in which a changing magnetic field generates electricity. C) The process in which electricity is produced by connecting wires to a battery. D) The process in which lightning strikes a building. Show Answer Correct Answer: B) The process in which a changing magnetic field generates electricity. 2. Explain the difference between self-induction and mutual induction. A) Self-induction is the result of external magnetic fields. B) Self-induction is the induction of EMF in the same coil due to its own changing current, while mutual induction is the induction of EMF in a nearby coil due to the changing current in another coil. C) Self-induction occurs only in transformers. D) Mutual induction involves the same coil affecting itself. Show Answer Correct Answer: B) Self-induction is the induction of EMF in the same coil due to its own changing current, while mutual induction is the induction of EMF in a nearby coil due to the changing current in another coil. 3. Determine the inductance of the coil if a 5 V self-induction EMF occurs at a rate of change of current of 10 A / s. A) 5 H. B) 0, 5 H. C) 2 H. D) 0, 2 H. Show Answer Correct Answer: B) 0, 5 H. 4. A magnet is moved in and out of a coil of wire connected to a high-resistance voltmeter. If the number of coils doubles, the induced voltage A) Quadruples. B) Doubles. C) Is the same. D) Halves. Show Answer Correct Answer: B) Doubles. 5. A conducting ring encloses an area of 2.0 cm$^{2}$ and is perpendicular to a magnetic field of strength 5.0 mT. The direction of the magnetic field is reversed in a time 4.0 s. What is the average emf induced in the ring? A) 0. B) 0.25 $\mu$V. C) 0.40$\mu$V. D) 0.50$\mu$V. Show Answer Correct Answer: D) 0.50$\mu$V. 6. This equation represents which law? $E=-\frac{N\Delta\Phi}{\Delta t}$ A) Faraday's Law. B) Newton's Law. C) Lenz's Law. D) Tesla's Law. Show Answer Correct Answer: C) Lenz's Law. 7. What happens to the potential difference when the wire stops moving? A) The potential difference disappears. B) The potential difference increases. C) The potential difference remains the same. D) The potential difference doubles. Show Answer Correct Answer: A) The potential difference disappears. 8. A magnet is moved inside a coil wire connect to a golvanometer . The galvanometer needle deflects due to induced current .The induced current. is due the change of ..... A) Induction current. B) Magnatic field. C) Voltage. D) E.M.F. Show Answer Correct Answer: B) Magnatic field. 9. .Assertion:In the phenomenon of mutual induction, self-induction of each of the coils persists. Reason:Self-induction arises when strength of current in same coil changes. In mutual induction, current is changing in both the individual coils. A) A. B) B. C) C. D) D. Show Answer Correct Answer: B) B. 10. AC generators have A) 2 slip rings. B) 1 slip ring. C) 3 slip rings. D) 4 slip rings. Show Answer Correct Answer: A) 2 slip rings. 11. Passing an electric current around an iron object will temporarily make the object magnetic. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 12. Which law states that the induced e.m.f. and the current constantly oppose the source that produces them? A) Lenz's. B) Charle's. C) Faraday's. D) Coulomb's. Show Answer Correct Answer: A) Lenz's. 13. The correct expression for motional emf is A) $Blv$. B) $NIBA$. C) $IlB$. D) $Blv^2$. Show Answer Correct Answer: A) $Blv$. 14. Choose the best definition for magnetic flux. A) The total magnetic field passing through a given area. B) The amount of electric current flowing through a conductor. C) The direction of magnetic field lines. D) The strength of a magnetic field at a point. Show Answer Correct Answer: A) The total magnetic field passing through a given area. 15. Which of the following devices is most likely to contain an electromagnet? A) Gas stove. B) Flashlight. C) Digital watch. D) Refrigerator. Show Answer Correct Answer: D) Refrigerator. 16. What is the voltage drop (in volts) of a 10 $\Omega$ resistor with 2 A of current running through it? A) $20$. B) 20 Mathematical EquivalenceON. C) All the above. D) None of the above. Show Answer Correct Answer: A) $20$. 17. Lenz's law is a consequence of the law of conservation of A) Charge. B) Mass. C) Momentum. D) Energy. Show Answer Correct Answer: D) Energy. 18. What did Michael Faraday say about induced EMF? A) It is inversely proportional to the rate of change of magnetic flux. B) It decreases with the increase of magnetic flux. C) It is proportional to the rate of change of magnetic flux. D) It is constant regardless of the magnetic flux. Show Answer Correct Answer: C) It is proportional to the rate of change of magnetic flux. 19. A long, current carrying wire passes through a circular loop of wire. If the current is constant, what is the induced emf of the loop? A) Clockwise. B) Counter Clockwise. C) I = 0. D) None of the above. Show Answer Correct Answer: C) I = 0. 20. A wire loop is held completely still in a very strong magnetic field. Why is NO current induced in the loop? A) The field is too strong. B) The wire isn't magnetic. C) The magnetic flux is not changing. D) The resistance is too high. Show Answer Correct Answer: C) The magnetic flux is not changing. 21. Describe the structure of a transformer A) Made of two coils of wire wound round an iron core. B) Made of wire coiled around a magnet. C) Made of 10 wires that are wrapped around a magnet. D) None of the above. Show Answer Correct Answer: A) Made of two coils of wire wound round an iron core. 22. Describe the direction of current in an AC generator? A) The electric current reverses direction regularly. B) The electric current flows is permanent. C) The flow of electric current is irreversible. D) The electric current flows in one direction. Show Answer Correct Answer: A) The electric current reverses direction regularly. 23. A transformer is designed to step up 110 V to 1320 V. If there are 300 turns on the primary side, how many turns are on the secondary side? A) 1200. B) 484. C) 3600. D) 25. Show Answer Correct Answer: D) 25. 24. How does Lenz's Law relate to electromagnetic induction? A) It determines the magnitude of induced current. B) It states that the direction of induced current opposes the change in magnetic flux. C) It calculates the resistance in a circuit. D) It measures the voltage across a coil. Show Answer Correct Answer: B) It states that the direction of induced current opposes the change in magnetic flux. 25. What is step-up transformer? A) A step-up transformer decreases voltage while increasing current. B) A step-up transformer increases voltage while decreasing current. C) A step-up transformer maintains both voltage and current levels. D) A step-up transformer converts AC to DC voltage. Show Answer Correct Answer: B) A step-up transformer increases voltage while decreasing current. ← 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 8Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 9Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 10Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books