This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 28 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 28 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Where is the energy being stored in an inductor carrying a steady current? A) In the electric field of the coil. B) In the circuit. C) In the power supply. D) In the magnetic field of the coil. Show Answer Correct Answer: D) In the magnetic field of the coil. 2. What factor does NOT affect the magnitude of induced voltage? A) Strength of the magnetic field. B) Speed of movement. C) Number of turns in the coil. D) Type of conductor material (copper vs. aluminum). Show Answer Correct Answer: D) Type of conductor material (copper vs. aluminum). 3. A straight wire, 0.5 m long, is moved straight up at a speed of 20 m/s through a 0.4-T magnetic field pointed in the horizontal direction. The wire is part of a circuit of total resistance of 6.0 Ohms' . What is the current in the circuit? A) 0.3 A. B) 0.4 A. C) 0.7 A. D) 0 A. Show Answer Correct Answer: C) 0.7 A. 4. A flat circular coil of diameter 30 mm has 500 turns and is situated so that the plane of the coil is perpendicular to a uniform magnetic field of flux density 20 mT. The flux density is reduced steadily to zero in a time of 30 ms. What is the average value of the e.m.f. induced in the coil? A) 0.24V. B) 0.94V. C) 240 000V. D) 940 000V. Show Answer Correct Answer: A) 0.24V. 5. How does Lenz's Law relate to the conservation of energy? A) Lenz's Law allows for the creation of energy from magnetic fields. B) Lenz's Law states that induced currents enhance changes in magnetic fields. C) Lenz's Law demonstrates the conservation of energy by ensuring that induced currents oppose changes in magnetic fields, preventing energy creation. D) Lenz's Law has no relation to energy conservation principles. Show Answer Correct Answer: C) Lenz's Law demonstrates the conservation of energy by ensuring that induced currents oppose changes in magnetic fields, preventing energy creation. 6. Change of current of 1 A s$^{-1}$ causes EMF of 1 V to be equal to A) 1 H. B) 1 V m$^{-1}$. C) 1 A. D) 1 J. Show Answer Correct Answer: A) 1 H. 7. A coil of 10 H inductance and 5Q resistance is connected to 5 volt battery in series. The current in ampere in circuit 2 seconds after switched is on A) El. B) (1-e). C) (1-e). D) E. Show Answer Correct Answer: D) E. 8. A straight conductor of length 0.2 m moves at a speed of 10 m/s perpendicular to a magnetic field of 0.5 T. The induced e.m.f. is A) 0.1 V. B) 1.0 V. C) 10 V. D) 100 V. Show Answer Correct Answer: B) 1.0 V. 9. According to the Lenz's Law, A) The induced e.m.f is proportional to the magnetic field. B) The direction of the induced e.m.f is such that it will oppose the change causing it. C) Fleming's Left hand rule can be used to determine the direction of induced e.m.f. D) The induced e.m.f is always in opposite direction to the magnetic field. Show Answer Correct Answer: B) The direction of the induced e.m.f is such that it will oppose the change causing it. 10. What is the purpose of lamination in the core of a transformer? A) To increase hysteresis losses. B) To decrease hysteresis losses. C) To decrease eddy current losses. D) To increase eddy current losses. Show Answer Correct Answer: C) To decrease eddy current losses. 11. Describe a practical example of Faraday's law in action. A) Transformers increase voltage using Faraday's law. B) Electric cars use Faraday's law to charge batteries. C) Solar panels operate based on Faraday's law principles. D) Electric generators convert mechanical energy into electrical energy using Faraday's law. Show Answer Correct Answer: D) Electric generators convert mechanical energy into electrical energy using Faraday's law. 12. An inductor ..... A) All of the above. B) Provides a specific value of inductance. C) Opposes any change in current. D) Stores energy in a magnetic field. Show Answer Correct Answer: C) Opposes any change in current. 13. The induced e.m, f in a coil does not depend on A) The number of turns in the coil. B) The rate of change of magnetic flux. C) Time of rotation. D) The resistance of the circuit. Show Answer Correct Answer: D) The resistance of the circuit. 14. As the loop rotates, why is a current induced in the loop? A) Due to the change in magnetic flux through the loop. B) Because of the loop's resistance. C) As a result of the loop's shape. D) Due to the loop's material. Show Answer Correct Answer: A) Due to the change in magnetic flux through the loop. 15. AC Generator:As the loop rotates clockwise, it cuts across decreasing number of field lines until it becomes zero when the armature is vertical. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 16. A coil spins in a magnetic field. Of the followingwhich causes an increase in the induced EMF inthe coil? A) Spinning the coil faster. B) Removing the coil from the magnetic field. C) Keeping the flux at a constant rate. D) Decreasing the number of turns of wire inthe coil. Show Answer Correct Answer: A) Spinning the coil faster. 17. When 0.5A current passes through an inductor coil, the flux linked with it is 0.15Wb .The self inductance of the coil is A) 3H. B) 0.45H. C) 0.3H. D) 0.2H. Show Answer Correct Answer: C) 0.3H. 18. What is another name for the generator effect? A) Magnetic resistance. B) Electromagnetic induction. C) Electric displacement. D) None of the above. Show Answer Correct Answer: B) Electromagnetic induction. 19. What is self-induction? A) Induction caused by external magnetic fields. B) Induction of voltage in a current-carrying wire. C) Induction that requires two coils. D) Induction that does not involve current. Show Answer Correct Answer: B) Induction of voltage in a current-carrying wire. 20. State how a moving coil galvanometer can be converted into an ammeter A) By connecting a shunt in parallel with its coil. B) By connecting a shunt in perpendicular with its coil. C) All the above. D) None of the above. Show Answer Correct Answer: A) By connecting a shunt in parallel with its coil. 21. Which of the following is NOT effect the magnitude of magnetic field intensity of the circular coil? A) Diameter of circular coil. B) Current flow in the coil. C) Magnetic poles. D) Number of coil. Show Answer Correct Answer: C) Magnetic poles. 22. How does the magnetic flux change as the magnet rises? A) It increases. B) It decreases. C) It remains constant. D) It fluctuates. Show Answer Correct Answer: B) It decreases. 23. The phenomenon of self-induction occurs in a single coil. This effect is related to which of the following? A) Mutual inductance. B) Self-inductance. C) Both A and B. D) Neither A nor B. E) None of these. Show Answer Correct Answer: B) Self-inductance. 24. In a transformer, if the number of turns in the primary coil is greater than in the secondary coil, what type of transformer is it? A) Step-up transformer. B) Step-down transformer. C) Isolation transformer. D) Variable transformer. Show Answer Correct Answer: B) Step-down transformer. 25. The value of self inductance of a coil is 5H. The value of current changes from 1A to 2A in 5 sec., then value of induced emf in it- A) 10V. B) 0.1V. C) 1.0V. D) 100V. Show Answer Correct Answer: C) 1.0V. ← 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