This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 16 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 16 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. A rectangular loop and a circular loop are moving out of a uniform magnetic field region. In which loop do you expect the induced emf to be constant A) Circular loop. B) Rectangular loop. C) Both (a) and (b). D) Neither (a) nor (b). Show Answer Correct Answer: B) Rectangular loop. 2. What is the function of a step up transformer? A) Increase the input voltage. B) Increase the output current. C) Increase the output voltage. D) Increase the resistance through a wire. Show Answer Correct Answer: C) Increase the output voltage. 3. In a generator, mechanical energy is converted into which type of energy? A) Mechanical energy. B) Thermal energy. C) Nuclear energy. D) Electrical energy. E) Solar energy. Show Answer Correct Answer: D) Electrical energy. 4. A magnet is cut into two, what poles are produced with the two magnets? A) Three positive; one negative. B) Two positive; two negative. C) One positive; three negative. D) Either four positive or negative. Show Answer Correct Answer: B) Two positive; two negative. 5. What is the purpose of the short circuit test in determining the equivalent circuit parameters of a transformer? A) To measure the core losses. B) To measure the copper losses. C) To measure the leakage flux. D) To measure the impedance. Show Answer Correct Answer: D) To measure the impedance. 6. A magnet is moved towards a coil at a constant speed. What happens to the magnetic flux through the coil? A) It decreases. B) It remains constant. C) It becomes zero. D) It increases. Show Answer Correct Answer: D) It increases. 7. Which field can accelerate an electron, but never change its speed? A) Electric field. B) Magnetic field. C) Both of these. D) Neither of these. Show Answer Correct Answer: B) Magnetic field. 8. Which of the following can be done to increase the induced current in the conductor? A) Using a larger magnet. B) Moving the magnet north pole first instead of the south pole. C) Moving conductor instead of the magnet. D) Using a coil instead of a single ring of wire. Show Answer Correct Answer: D) Using a coil instead of a single ring of wire. 9. Electrical energy is usually transmitted using alternating high voltages. Which of the following statement is incorrect? A) Alternating voltage means that voltage is easy to change. B) High voltage means less power loss during transmission, so more efficient. C) The voltage is step up before transmission and step down before reaching the home. D) The frequency of the a.c. is changed in stages before reaching the home at 50 Hz. Show Answer Correct Answer: D) The frequency of the a.c. is changed in stages before reaching the home at 50 Hz. 10. Which of the following will generate a current in a loop? A) A magnet. B) A gravitational force. C) A moving magnet. D) Friction. Show Answer Correct Answer: C) A moving magnet. 11. How does the direction of the current in the loop compare to the electric field? A) The current is in the same direction as the electric field. B) The current is in the opposite direction to the electric field. C) The current is perpendicular to the electric field. D) The current direction is independent of the electric field. Show Answer Correct Answer: B) The current is in the opposite direction to the electric field. 12. The EMF induced in a conductor is proportional to the rate at which magnetic field lines are cut by the conductor?The law above is? A) Lenz's law. B) Kirchoff's law. C) Faraday's law. D) None of the above. Show Answer Correct Answer: C) Faraday's law. 13. What does an electric generator do? A) Converts electrical energy to mechanical energy. B) Converts mechanical energy to electrical energy. C) Stores electrical energy. D) Increases voltage levels. Show Answer Correct Answer: B) Converts mechanical energy to electrical energy. 14. The induced current generated by a dynamo is affected by the following except A) Cross-sectional area of coil. B) Number of turns of coil. C) Speed of rotation. D) Magnetic field strength. E) Electric field strength. Show Answer Correct Answer: E) Electric field strength. 15. Which one of the following graph in following figures represents the variation of reactance x of a capacitor with frequency f of an AC supply. A) A. B) B. C) C. D) D. Show Answer Correct Answer: D) D. 16. What is the role of a transformer? A) A device that converts electrical energy into mechanical energy. B) A device that transfers electrical energy between two or more circuits through electromagnetic induction, typically used to increase or decrease voltage. C) A device that stores electrical energy for later use. D) A device that measures electrical current in a circuit. Show Answer Correct Answer: B) A device that transfers electrical energy between two or more circuits through electromagnetic induction, typically used to increase or decrease voltage. 17. What is the physics principle of a generator? A) Motor effect. B) Hall effect. C) Electromagnetic induction. D) Photoelectric effect. Show Answer Correct Answer: C) Electromagnetic induction. 18. A loop of wire is placed in a magnetic field that is increasing in strength. What happens to the induced current in the loop? A) It remains zero. B) It flows into the page. C) It flows counterclockwise. D) It flows clockwise. Show Answer Correct Answer: C) It flows counterclockwise. 19. What is the value of power factor in a series LCR circuit at resonance A) Zero. B) One. C) Minus one. D) None. Show Answer Correct Answer: A) Zero. 20. What is the voltage from an alternator half a turn/rotation after maximum positive output? A) Maximum Positive Output again. B) Zero. C) Minimum Negative Output. D) Maximun Negative output. Show Answer Correct Answer: D) Maximun Negative output. 21. What might happen if transformers didn't exist? A) The electricity in your house might have an extremely high voltage. B) Electricity could not be distributed through power lines to people's homes. C) Electricity could not be created at power plants. D) The direction of the electric current in your home might switch back and forth. Show Answer Correct Answer: A) The electricity in your house might have an extremely high voltage. 22. What is the purpose of the equivalent circuit of a transformer? A) To simplify the transformer operation. B) To complicate the transformer operation. C) To increase the losses in the transformer. D) To decrease the efficiency of the transformer. Show Answer Correct Answer: A) To simplify the transformer operation. 23. Two similar circular loops carry equal currents in the same direction. On moving the coils further apart, the electric current will A) Remain unaltered. B) Increases in one and decreases in the second. C) Increase in both. D) Decrease in both. Show Answer Correct Answer: C) Increase in both. 24. If we move a bar magnet back and forth inside a current containing iron coil, what would you expect to happen? A) The needle on galvanometer slides to the right edge (highest measurement). B) Nothing will happen. C) The needle on galvanometer slides to right and left as the magnet movement. D) The needle on voltmeter slides to the left edge. Show Answer Correct Answer: C) The needle on galvanometer slides to right and left as the magnet movement. 25. What is the effect of inserting an iron rod into a coil during electromagnetic induction? A) It increases the induced current. B) It decreases the induced current. C) It has no effect. D) It reverses the current direction. Show Answer Correct Answer: A) It increases the induced 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 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