This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 17 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 17 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. It's the product of the magnetic flux density and the area normal to the lines of flux. A) Magnetic Flux Density. B) Magnetic Flux. C) Magnetic Flux Linkage. D) Magnetic Field. Show Answer Correct Answer: B) Magnetic Flux. 2. What is the basic idea behind electromagnetic induction? A) When a wire moves through magnetic field lines, it generates electricity. B) When a wire moves through electric field lines, it generates magnetism. C) When a wire moves through light waves, it generates electricity. D) When a wire moves through sound waves, it generates electricity. Show Answer Correct Answer: A) When a wire moves through magnetic field lines, it generates electricity. 3. The magnitude of the ..... of the charged particle depends on the strength of the magnetic field and the velocity of the particle. A) Direction. B) Speed. C) Acceleration. D) Force. Show Answer Correct Answer: C) Acceleration. 4. Which among the choices is NOT a factor that affects the magnitude of an electromotive force? A) Area of the coil. B) Orientation of the poles. C) Number of turns in the coil. D) Magnetic strength of the core. Show Answer Correct Answer: B) Orientation of the poles. 5. What is the effect of moving a conductor through a magnetic field? A) It stops the current. B) It has no effect. C) It induces a current. D) It increases resistance. Show Answer Correct Answer: C) It induces a current. 6. Question 17 A) A. B) B. C) C. D) D. Show Answer Correct Answer: D) D. 7. A simple electric generator induces an electromotive force (e.m.f.). Which modification would increase the induced e.m.f.? A) Increase the number of turns in the coil of the generator. B) Increase the distance between the magnetic poles. C) Reduce the strength of the magnetic field around the coil. D) Reverse the direction of the magnetic field. Show Answer Correct Answer: A) Increase the number of turns in the coil of the generator. 8. A step-up transformer increases A) Power. B) Energy. C) Neither. D) Both. Show Answer Correct Answer: A) Power. 9. What is the relationship between magnetic field strength and induced voltage? A) The induced voltage is inversely proportional to the magnetic field strength. B) The induced voltage is directly proportional to the rate of change of the magnetic field strength. C) The induced voltage is independent of the magnetic field strength. D) The induced voltage is proportional to the square of the magnetic field strength. Show Answer Correct Answer: B) The induced voltage is directly proportional to the rate of change of the magnetic field strength. 10. Which electrical device uses the turning effect produced by a current-carrying coil in a magnetic field? A) A.c. generator. B) D.c. motor. C) Relay. D) Transformer. Show Answer Correct Answer: B) D.c. motor. 11. Which device relies upon the magnetic effect of an electric current? A) Fuse. B) Relay. C) Thermistor. D) Variable resistor. Show Answer Correct Answer: B) Relay. 12. Why is soft iron prefer to Steel in making the core of a transformer A) Energy loss per unit volume due to hysteresis is low. B) Energy loss per unit volume due to hysteresis is high. C) Energy loss per unit volume due to hysteresis normal. D) None of the above. Show Answer Correct Answer: A) Energy loss per unit volume due to hysteresis is low. 13. How does the frequency of AC affect its applications? A) The frequency of AC has no impact on its applications. B) Higher frequency always leads to better performance in all devices. C) AC frequency is only relevant for power generation, not for consumer electronics. D) The frequency of AC affects its applications by influencing efficiency, suitability for devices, and performance characteristics. Show Answer Correct Answer: D) The frequency of AC affects its applications by influencing efficiency, suitability for devices, and performance characteristics. 14. The unit of electromotive force is ..... A) Volt. B) Tesla. C) Newton. D) Electron . volt. Show Answer Correct Answer: A) Volt. 15. State Lenz Law A) The induced current opposes magnetic flux. B) The emf opposes change in magnetic flux. C) The direction of induced current opposes in magnetic flux. D) The direction of induced current opposes the change in magnetic flux. Show Answer Correct Answer: D) The direction of induced current opposes the change in magnetic flux. 16. If the angle between the magnetic field and the area vector is 90$^\circ$, the magnetic flux is A) Maximum. B) Minimum. C) Zero. D) Equal to the magnetic field strength. Show Answer Correct Answer: C) Zero. 17. What does Faraday's Law state about electromagnetic induction? A) Faraday's Law states that a change in magnetic flux induces an electromotive force in a circuit. B) A constant magnetic field generates an electric current without any change. C) Electromagnetic induction occurs only in superconductors. D) Faraday's Law states that electric current can create a magnetic field without any flux change. Show Answer Correct Answer: A) Faraday's Law states that a change in magnetic flux induces an electromotive force in a circuit. 18. Which rule is used to determine the direction of force on a conductor due to motor effect? A) Fleming's left-hand rule. B) Fleming's right-hand rule. C) Right hand grip rule. D) Left hand grip rule. Show Answer Correct Answer: A) Fleming's left-hand rule. 19. Electrical energy is transferred by transmission lines at high voltage. Which statement explains why a high voltage is used? A) The voltage is alternating. B) The transmission lines have a larger resistance. C) The transmission lines carry greater power. D) There is a smaller current in the transmission lines for the same power. Show Answer Correct Answer: D) There is a smaller current in the transmission lines for the same power. 20. Lenz's Law on electromagnetic induction is a direct result of the conservation of A) Mass. B) Charge. C) Energy. D) Momentum. Show Answer Correct Answer: C) Energy. 21. What types of metals are attracted to a magnet? A) Steel. B) Iron. C) Nickel. D) All of the above are attracted to magnets. Show Answer Correct Answer: D) All of the above are attracted to magnets. 22. What happens to the magnetic field when the direction of the current in a wire is reversed? A) The magnetic field will remain unchanged. B) The magnetic field will reverse direction as well. C) The magnetic field will decrease in strength. D) The magnetic field will increase in strength. Show Answer Correct Answer: B) The magnetic field will reverse direction as well. 23. The core of a transformer is made of iron because ..... A) It is strong. B) It conducts electricity. C) It is a soft magnetic material. D) It is a hard magnetic material. E) It has a high melting point. Show Answer Correct Answer: C) It is a soft magnetic material. 24. A current in a solenoid produces a uniform magnetic field inside the solenoid. The magnetic field direction is due east. Which changes will produce a stronger magnetic field with a direction due west? A) Use a smaller current and turn the solenoid through 180$^\circ$. B) Use a smaller current and reverse the current. C) Use a larger current and turn the solenoid through 90$^\circ$. D) Use a larger current and reverse the current. Show Answer Correct Answer: D) Use a larger current and reverse the current. 25. A transformer has 2.000 turns of the primary winding and 200 V the primary voltage. Determine the secondary winding if the secondary voltage 150 V. A) 2000 turns. B) 1000 turns. C) 500 turns. D) 1500 turns. Show Answer Correct Answer: D) 1500 turns. ← 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