This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 2 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The energy stored in an inductor is given by A) U=1/2 LI$^{2}$. B) U=1/2 CV$^{2}$. C) U=1/2 QV. D) U=1/2IR. Show Answer Correct Answer: A) U=1/2 LI$^{2}$. 2. Eddy currents are induced when A) A metal block is kept in a uniform magnetic field. B) Current is passed in a coil. C) A metal block is kept in a changing magnetic field. D) A coil is kept in a uniform magnetic field. Show Answer Correct Answer: C) A metal block is kept in a changing magnetic field. 3. In an experiment, a coil is moved rapidly through a magnetic field. What is the observed effect? A) The coil heats up. B) An electric current is induced in the coil. C) The coil becomes magnetized. D) The coil changes color. Show Answer Correct Answer: B) An electric current is induced in the coil. 4. A metallic rod CD rest on a thick metallic wire pqrs with arms PQ and RS are parallel to each other at a distance of l equal to 50 cm as shown in the figure. A uniform magnetic field B=0.2T ad perpendicular to the plane of the paper pointing in words. The rod is now made to slide towards right with a constant velocity v =6.0 m/s. A) 0.2V. B) 0.6V. C) 0.7V. D) 0.4V. Show Answer Correct Answer: B) 0.6V. 5. If there is no relative motion between the magnetic field and the conductor, there is no current induced. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 6. A device that transforms electrical energy into mechanical energy is called a A) Generator. B) Motor. C) Transformer. D) Magnet. Show Answer Correct Answer: B) Motor. 7. The process of generating the current in a conductor is called as A) Electro motive force. B) Electromagnetic induction. C) Generator energy conversion. D) Induced voltage. Show Answer Correct Answer: B) Electromagnetic induction. 8. A moving magnetic field will produce the same effect as a conductor that is moving A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 9. A coil of inductance 2 Hhas a current of 5.8 A. The flux in weber through the coil is- A) 0.29. B) 2.9. C) 3.12. D) 11.6. Show Answer Correct Answer: D) 11.6. 10. A step-down transformer is 100% efficient. It has an input voltage of 240 V a.c. and an output voltage of 60 V a.c. The current in the primary coil is 0.50 A. What is the current in the secondary coil? A) 0.13 A. B) 0.50 A. C) 2.0 A. D) 8.0 A. Show Answer Correct Answer: C) 2.0 A. 11. Ratio of voltages is equal to ratio of A) Iron sheets in core. B) Coil. C) Number of turns in coil. D) All of above. Show Answer Correct Answer: C) Number of turns in coil. 12. An element is known to have 35 nucleon and 12 electrons. It has the charge +3 Determine the most possible composition of its nucleus! A) 20 neutrons, 15 protons. B) 23 neutrons, 12 protons. C) 23 neutrons, 12 electrons. D) 20 neutrons, 12 protons. Show Answer Correct Answer: A) 20 neutrons, 15 protons. 13. What is step-down transformer? A) A step-down transformer is a device that decreases voltage and increases current. B) A step-down transformer is a device that only increases voltage. C) A step-down transformer is used to convert AC to DC. D) A step-down transformer increases voltage and decreases current. Show Answer Correct Answer: A) A step-down transformer is a device that decreases voltage and increases current. 14. A long solenoid with 15turns per cm has a small loop of area 2cm$^{2}$ placed inside normal to the axis of the solenoid. The current carried by the solenoid changes steadily from 2A to 4A in 0.1second.What is the induced emf in the loop while current is changing. A) 7.5*10$^{-6}$V. B) 7.5V. C) 2.5V. D) 7.5*10$^{6}$V. Show Answer Correct Answer: A) 7.5*10$^{-6}$V. 15. Choose the best definition for magnetic field. A) A force that attracts all objects towards the Earth. B) A region where only electric charges can be observed. C) A region around a magnetic material or moving electric charge where magnetic forces can be observed. D) A type of energy that is emitted by all materials. Show Answer Correct Answer: C) A region around a magnetic material or moving electric charge where magnetic forces can be observed. 16. Observe:Move the wire loop down, towards the magnet. In which direction is the current moving? A) Clockwise. B) Counterclockwise. C) Upwards. D) Downwards. Show Answer Correct Answer: A) Clockwise. 17. Observe:Check that Show loop data is on. Move the wire loop up, away from the magnet. Is the magnetic flux increasing or decreasing as you do this? A) Increasing. B) Decreasing. C) No change. D) Fluctuating. E) Constant. Show Answer Correct Answer: B) Decreasing. 18. Faraday's Law states that A) The magnitude of induced e.m.f is inversely proportional to the the rate of cutting of the magnetic field. B) The magnitude of induced e.m.f is directly proportional to the the rate of cutting of the magnetic field. C) The direction of induced e.m.f is inversely proportional to the the rate of cutting of the magnetic field. D) The direction of induced e.m.f is directly proportional to the the rate of cutting of the magnetic field. Show Answer Correct Answer: B) The magnitude of induced e.m.f is directly proportional to the the rate of cutting of the magnetic field. 19. How can electromagnetic induction be used in power generation? A) Electromagnetic induction is used in power generation by rotating a coil in a magnetic field to induce electric current. B) Using solar panels to capture sunlight directly. C) Burning fossil fuels to generate heat for electricity. D) Storing energy in batteries for later use. Show Answer Correct Answer: A) Electromagnetic induction is used in power generation by rotating a coil in a magnetic field to induce electric current. 20. How can an electromagnet be helpful in a junkyard? A) It can help the workers move around the yard. B) It can covert electrical energy into mechanical energy. C) It can move heavy pieces of metal. D) It can send out voltage waves. Show Answer Correct Answer: C) It can move heavy pieces of metal. 21. The strength of an electromagnet decreases when you increase the current. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 22. What is meant by a step down transformer? A) One where the output voltage is the same as the input voltage. B) One where the output voltage is larger than the input voltage. C) One where the output voltage is smaller than the input voltage. D) None of the above. Show Answer Correct Answer: C) One where the output voltage is smaller than the input voltage. 23. Which is an interaction that is not mediated by an electric field? A) Electric interactions. B) Magnetic interactions. C) All the above. D) None of the above. Show Answer Correct Answer: B) Magnetic interactions. 24. Back e.m.f. is induced in a spinning electric motor. Which statement about the back e.m.f is NOT true? A) It reduces the electric power supplied to the motor. B) Its magnitude is bigger when the motor starts to spin. C) Its direction is opposite to the direction of the voltage supplied. D) It is generated when an armature coil undergoes a magnetic flux change. Show Answer Correct Answer: B) Its magnitude is bigger when the motor starts to spin. 25. The induced emf in a coil of 10 henry inductance in which current varies from 9 A to 4 A in 0.2 second is A) 200 V. B) 250 V. C) 300 V. D) 350 V. Show Answer Correct Answer: B) 250 V. ← PreviousNext →Related QuizzesClass 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 1Class 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 10Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books