This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 34 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 34 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A solenoid of length 50 cm and 5000 turns carries a current of 10 A. What is the magnetic field at the ends of the solenoid? A) 0.063 T. B) 0.126 T. C) 0.006 T. D) 0.001 T. Show Answer Correct Answer: A) 0.063 T. 2. Electric interactions occur between the charged particles that are mediated by their magnetic field. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 3. Changing current in a coil produces e.m.f in another, this phenomenon is known as A) E.m.f. B) Self-induction. C) Induced e.m.f. D) Mutual induction. Show Answer Correct Answer: D) Mutual induction. 4. A coil of area 30 $cm^2$ A) 0.021 Wb. B) 0.105 Wb. C) 1050 Wb. D) 1500 Wb. Show Answer Correct Answer: B) 0.105 Wb. 5. What did the experiment with the LED demonstrate? A) The LED can light up without any power source. B) LEDs can generate their own electromagnetic fields. C) Magnetic fields can generate light directly. D) Spinning magnets near a coil can induce current to light an LED. Show Answer Correct Answer: D) Spinning magnets near a coil can induce current to light an LED. 6. When power is supplied to an electric motor, the motor armature rotates in a magnetic field and induced e.m.f. is generated. Which statement about the motor is not true? A) The induced e.m.f. opposes the e.m.f. supplied. B) The induced e.m.f. is greater than the e.m.f. supplied. C) The induced e.m.f. is maximum when the armature rotates with maximum speed. D) The difference voltage across the armature is smaller then the e.m.f. supplied. Show Answer Correct Answer: B) The induced e.m.f. is greater than the e.m.f. supplied. 7. What is the direction of induced current in a coil when the magnetic field through it changes? A) The direction of the induced current is such that it opposes the change in magnetic field. B) The direction of the induced current is opposite to the direction of the magnetic field. C) The direction of the induced current is random and cannot be determined. D) The direction of the induced current is such that it aligns with the change in magnetic field. Show Answer Correct Answer: A) The direction of the induced current is such that it opposes the change in magnetic field. 8. The total number of magnetic field lines passing through an area is termed as? A) Voltage. B) EMF. C) Magnetic flux. D) Magnetic flux density. Show Answer Correct Answer: C) Magnetic flux. 9. True or false? A moving magnet can generate current in a wire. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 10. The unit of self-inductance is A) Weber ampere. B) Weber-1 ampere. C) Ohm second. D) Farad. Show Answer Correct Answer: C) Ohm second. 11. What does the index finger show you in the Fleming's right-hand rule? A) Direction of current. B) Motion of wire. C) Direction of electric field. D) Direction of magnetic field. Show Answer Correct Answer: D) Direction of magnetic field. 12. Lenz's Law states that the induced current always flows in a direction that oppose the change of magnetic flux that causes it. A) True. B) False. C) Not sure. D) None of the above. Show Answer Correct Answer: A) True. 13. What is true of AC GENERATOR? A) It works on the principle of electromagnetic induction. B) The mechanical energy of the rotation is converted into electrical energy. C) A pair of slip rings are used in the AC generator. D) All the above. Show Answer Correct Answer: D) All the above. 14. What type of current is produced by an AC generator? A) Direct current. B) Alternating current. C) Variable current. D) Steady current. Show Answer Correct Answer: B) Alternating current. 15. A closed iron ring is held horizontally and a bar magnet is dropped through the ring with its length along the axis of the ring. The acceleration of the falling magnet is A) Equal to g. B) Less than g. C) More than g. D) Depends on diameter of ring and length of magnet. Show Answer Correct Answer: C) More than g. 16. Which particle is cathode ray? A) Electron beam. B) Gamma ray. C) Neutron. D) Alpha particles. Show Answer Correct Answer: A) Electron beam. 17. All of the following statements are true about magnetic flux except A) It is independent of surface area. B) It is the product of the normal component of the surface area with magnetic flux density. C) It is zero if the magnetic field is parallel to the surface. D) It represents the total magnetic field lines through a surface. Show Answer Correct Answer: A) It is independent of surface area. 18. When the current in a coil is reduced uniformlyfrom 20 A to zero in 0.50 s, an e.m.f. of 4.0 V is induced in a neighbouring coil. What is the value of the mutual inductance between the two coils? A) A 0.10 H. B) B 0.40 H. C) C 2.5 H. D) D 40 H. Show Answer Correct Answer: A) A 0.10 H. 19. If the current in a coil changes at a rate of 2 A/s and the induced e.m.f. is 10 V, the self-inductance of the coil is A) 0.2 H. B) 2 H. C) 5 H. D) 20 H. Show Answer Correct Answer: C) 5 H. 20. Lenz's law deals with: A) Magnitude of emf. B) Direction of emf. C) Resistance. D) Direction of induced current. Show Answer Correct Answer: D) Direction of induced current. 21. Faraday's Law states that the induced emf is directly proportional to A) The current. B) The cross sectional area of the coil. C) The rate of change in the flux of the coil. D) None of the above. Show Answer Correct Answer: C) The rate of change in the flux of the coil. 22. An ideal transformer has 500 turns on the secondary and 50 turns on the primary, How much voltage is in the secondary if there is 10V in the primary? A) 50V. B) 100V. C) 500V. D) 1000V. Show Answer Correct Answer: B) 100V. 23. What occurs when the live wire and the neutral wire come into direct contact in a circuit? A) Voltage drop. B) Short-circuiting. C) Overloading. D) Underloading. Show Answer Correct Answer: B) Short-circuiting. 24. The magnetic field energy of a coil having 500 turns is 25 J. The current in the coil is 5 A. What magnetic flux penetrates each coil coil? A) 10 mWb. B) 1 mWb. C) 20 mWb. D) 2 mWb. Show Answer Correct Answer: C) 20 mWb. 25. Interactions between charged particles. A) Electric interactions. B) Magnetic Interactions. C) All the above. D) None of the above. Show Answer Correct Answer: A) Electric interactions. ← 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