This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 19 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 19 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Magnetic Resonance Imaging (MRI) is an application of magnet. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 2. In which of the following situations is an e.m.f. induced in a conductor? A) The conductor is connected to a battery. B) The conductor is connected to a motor. C) The conductor moves through the air. D) The conductor is moved in a magnetic field. Show Answer Correct Answer: D) The conductor is moved in a magnetic field. 3. Question 1 A) A. B) B. C) C. D) D. Show Answer Correct Answer: C) C. 4. A 60 turn square coil of area 0.042 m$^{2}$ and a 40 turn circular coil are both placed perpendicular to the same magnetic field. The voltage induced in each of the coils is the same. What is the area of the circular coil? A) 0.028 m$^{2}$. B) 0.063 m$^{2}$. C) 0.083 m$^{2}$. D) 0.034 m$^{2}$. E) 0.075 m$^{2}$. Show Answer Correct Answer: B) 0.063 m$^{2}$. 5. The process of inducing an electric current with a magnetic field known as electromagnetic induction. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 6. In a 12 V transformer connected to a regular 120 V /5 A line. the output current will be A) 50 A. B) 20 A. C) 1.2 A. D) None of the above. Show Answer Correct Answer: A) 50 A. 7. What can electromagnets do that regular magnets can't? A) Explode. B) No difference, both are the same. C) Burn. D) Switch their magnetic fields. Show Answer Correct Answer: D) Switch their magnetic fields. 8. What is the purpose of the open 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 magnetization current. D) To measure the leakage flux. Show Answer Correct Answer: A) To measure the core losses. 9. Current is ..... through a wire. A) Protons moving. B) Electrons moving. C) Neutrons moving. D) Atoms moving. Show Answer Correct Answer: B) Electrons moving. 10. Transformer is device that A) Converts AC voltage to current. B) Converts electrical energy to kinetic energy. C) Converts AC voltage to a different level at the same amplitude. D) Converts AC voltage to a different level at the same frequency. Show Answer Correct Answer: D) Converts AC voltage to a different level at the same frequency. 11. What is the effect of electromagnetic induction in a conductor? A) Creates a magnetic field. B) Creates an electric field. C) Generates current. D) Generates voltage. E) Both C and D. Show Answer Correct Answer: E) Both C and D. 12. Solenoid #1 has a length L, cross-sectional area A, and N turns. Solenoid #2 has a length 2L, cross-sectional area 2A, and 2N turns. Which solenoid has the greater magnetic field at its center when equal currents are going through them? A) #1. B) #2. C) Both have the same magnetic field. D) Since it depends on the values of A and L, none of the above are correct. Show Answer Correct Answer: C) Both have the same magnetic field. 13. What is the purpose of the commutator in a d.c. electric motor? A) To control the speed at which the motor rotates. B) To reverse the direction of the voltage across the power supply every half-turn. C) To reverse the direction of the current in the motor coil every half-turn. D) To reverse the direction of spin of the motor coil every half-turn. Show Answer Correct Answer: C) To reverse the direction of the current in the motor coil every half-turn. 14. For a transformer to work properly, it must ..... A) Be connected to alternating current. B) Have a core made of Carbon. C) Be connected to direct current. D) Have infinite resistance. Show Answer Correct Answer: A) Be connected to alternating current. 15. Dynamos are generators that produce direct current. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 16. A solenoid wound over a rectangular frame. If all the linear dimensions of the frame are increased by a factor 3 and the number of turns per unit length remains the same, the self inductance increased by a factor of- A) 3. B) 9. C) 227. D) 63. Show Answer Correct Answer: B) 9. 17. Which of the following equations are correct for the magnitude of the electric field strength when the Hall Effect occurs? A) E = Bv. B) E = B/ v. C) E = v/B. D) None of the above. Show Answer Correct Answer: A) E = Bv. 18. Which of these is a valid form of Ohm's Law? A) $V=I^2\times R$. B) $V=I\times R$. C) $V=\frac{R}{I}$. D) $V=\frac{I}{R}$. Show Answer Correct Answer: B) $V=I\times R$. 19. What is the SI unit of magnetic flux? A) Volt. B) Weber. C) Tesla. D) Farad. E) Joule. Show Answer Correct Answer: B) Weber. 20. What will occur if two positively charged particle are placed near each other? A) Nothing. B) Attraction. C) Repulsion. D) Depends on the magnet. Show Answer Correct Answer: C) Repulsion. 21. Which of the following factors DOES NOT affect the self inductance of a coil? A) The length of the coil. B) The current flows in the coil. C) The number of turn of the coil. D) The cross sectional area of the coil. Show Answer Correct Answer: A) The length of the coil. 22. An inductor opposes any change in: A) Voltage. B) Current. C) Frequency. D) Reactance. Show Answer Correct Answer: B) Current. 23. According to Faraday's law, what induces an electromotive force (emf) in a coil? A) Constant magnetic field. B) Changing magnetic flux. C) Static electric field. D) Fixed current. Show Answer Correct Answer: B) Changing magnetic flux. 24. A coil and a magnet moves with their constant speeds 5 m/sec. and 3 m/sec. respectively, towards each other, then induced emf in coil is 16 mV. If both are moves in same direction, then induced emf in coil- A) 15 mV. B) 4 mV. C) 64 mV. D) Zero. Show Answer Correct Answer: D) Zero. 25. When was electromagnetism discovered? A) 1731. B) 1831. C) 1931. D) 2031. Show Answer Correct Answer: B) 1831. ← 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