This quiz works best with JavaScript enabled. Home > Cbse > Class 12 > Science > Physics Part I > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 4 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 4 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The direction of eddy currents is given by A) Fleming's left hand rule. B) Biot-Savart law. C) Lenz's law. D) Ampere-circuital law. Show Answer Correct Answer: C) Lenz's law. 2. How can electromagnetic induction be used in electric vehicles? A) Electromagnetic induction enables wireless charging in electric vehicles. B) It allows for faster battery charging through direct connection. C) Electromagnetic induction is used for regenerative braking in electric vehicles. D) Electromagnetic induction powers the vehicle's air conditioning system. Show Answer Correct Answer: A) Electromagnetic induction enables wireless charging in electric vehicles. 3. In a closed circuit, electric currents are induced so as to oppose the changing magnetic flux as per A) Law of conservation of charge. B) Law of conservation of mass. C) Law of conservation of energy. D) Law of conservation of current. Show Answer Correct Answer: C) Law of conservation of energy. 4. Which of the devices is not based on electromagnetic induction? A) Transformer. B) Generator. C) Electrodynamic microphone. D) Electric motor. Show Answer Correct Answer: D) Electric motor. 5. When a loop of wire is moved across a magnetic field, the current is produced in it is called A) Direct current. B) Photo electric current. C) Alternating current. D) Induced current. Show Answer Correct Answer: D) Induced current. 6. The magnitude of the induced emf in a circuit is equal to the magnetic flux through the circuit A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. 7. For a generator model, what is the cause and effect of the model? A) Cause:current in a wireeffect:a magnetic field is produced around the wire. B) Cause:a changing magnetic fieldeffect:current is produced. C) Cause:light turns oneffect:current is produced. D) Cause:current is producedeffect:magnetic field is changing. E) Cause:magnetic fieldeffect:light is produced. Show Answer Correct Answer: B) Cause:a changing magnetic fieldeffect:current is produced. 8. Discuss the factors affecting the magnitude of induced EMF in a coil. A) Number of turns, strength of magnetic field, area of the coil, rate of change of magnetic field, orientation of the coil. B) Temperature of the surroundings. C) Length of the wire. D) Color of the coil. Show Answer Correct Answer: A) Number of turns, strength of magnetic field, area of the coil, rate of change of magnetic field, orientation of the coil. 9. Primary:120 V, 4 ASecondary:8 A. What is the voltage? A) 60 V. B) 240 V. C) 180 V. D) 120 V. Show Answer Correct Answer: A) 60 V. 10. Which is the best method to determine the direction of the induced current? A) Fleming's right-hand rule. B) Fleming's left-hand rule. C) All the above. D) None of the above. Show Answer Correct Answer: A) Fleming's right-hand rule. 11. What is Faraday's Law? A) Faraday's Law states that electric currents can exist without magnetic fields. B) Faraday's Law explains how to create magnetic fields using only heat. C) Faraday's Law describes the relationship between changing magnetic fields and electric currents. D) Faraday's Law is a principle that only applies to static electricity. Show Answer Correct Answer: C) Faraday's Law describes the relationship between changing magnetic fields and electric currents. 12. The gold foil experiment also called as? A) Cathode ray tube experiment. B) The Geiger-Marsden experiment. C) Experimental bombardment of beryllium with alpha rays. D) None of the above. Show Answer Correct Answer: B) The Geiger-Marsden experiment. 13. A rectangular loop is moving out of a uniform magnetic field. What happens to the magnetic flux through the loop? A) It remains constant. B) It increases. C) It becomes zero. D) It decreases. Show Answer Correct Answer: D) It decreases. 14. The phenomenon due to which there is an induced current in one coil due to the current in a neighboring coil is? A) Steady current. B) Self induction. C) Mutual induction. D) Electromagnetism. Show Answer Correct Answer: C) Mutual induction. 15. Thrust a magnet into a coil of wire. While the magnet is being moved toward the coil A) Becomes an electromagnet. B) Has a current in it. C) Both of these. D) Neither of these. Show Answer Correct Answer: C) Both of these. 16. Two coils, X and Y, are placed facing one another a few centimeters apart. When the current in Coil X is increased at a steady rate of 5.0 As$^{-1}$, a constant e.m.f. of 35.0 mV is induced across the terminals of Coil Y. The mutual inductance of this arrangement is A) 0.037 H. B) 0.025 H. C) 0.012 H. D) 0.0007 H. Show Answer Correct Answer: D) 0.0007 H. 17. What is magnetic flux? A) The amount of electric charge passing through a surface per unit time. B) The product of the magnetic field strength and the area perpendicular to the field through which the field lines pass. C) The force experienced by a charged particle in a magnetic field. D) The total number of magnetic field lines passing through a given area. Show Answer Correct Answer: B) The product of the magnetic field strength and the area perpendicular to the field through which the field lines pass. 18. What role does a transformer play in mutual induction? A) A transformer facilitates mutual induction by transferring energy between its primary and secondary windings through a changing magnetic field. B) A transformer converts sound waves into electrical signals. C) A transformer only works with direct current (DC). D) A transformer generates electricity without any magnetic field. Show Answer Correct Answer: A) A transformer facilitates mutual induction by transferring energy between its primary and secondary windings through a changing magnetic field. 19. A transformer consists of A) Metal Core. B) Metal core and coiled wire. C) Metal core and polymer wire. D) Polymer core and metal wire. Show Answer Correct Answer: B) Metal core and coiled wire. 20. An inductor is a circuit element that can store energy in A) Magnetic field. B) Electric flux. C) Electric field. D) None. Show Answer Correct Answer: A) Magnetic field. 21. When an electromagnet's circuit is broken, it loses its magnetic properties. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 22. What is the effect of increasing 'L' in the self induction formula? A) Increases induced voltage. B) No effect on induced voltage. C) Changes current direction. D) Decreases induced voltage. Show Answer Correct Answer: A) Increases induced voltage. 23. Surrounding every moving electron is A) A magnetic field. B) An electric field. C) Both of these. D) None of these. Show Answer Correct Answer: C) Both of these. 24. All of the following will have an induced emf EXCEPT A) A loop of wire moves from one end of a magnetic field to the other. B) A loop of wire moves out of a magnetic field. C) A loop of wire moves into a magnetic field. D) A loop of wire rotates about its diameter in a magnetic field. Show Answer Correct Answer: A) A loop of wire moves from one end of a magnetic field to the other. 25. Explain the concept of back EMF in motors and its implications. A) Back EMF only occurs in stationary motors. B) Back EMF in motors is the voltage generated in the opposite direction to the applied voltage when the motor is running. It helps limit the current drawn by the motor and protects it from damage. C) Back EMF is the voltage generated in the same direction as the applied voltage in motors. D) Back EMF has no impact on the current drawn by the motor. Show Answer Correct Answer: B) Back EMF in motors is the voltage generated in the opposite direction to the applied voltage when the motor is running. It helps limit the current drawn by the motor and protects it from damage. 26. Generators are used in power plants to convert other forms of energy into electrical energy. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 27. As the current decreases in the coil from 20 A to 10 A for 0.1 s, a self-induction of 200 V. occurs in it. What magnetic flux penetrates the coil at the instant when 15 A current flows through it? A) 450 Wb. B) 45 Wb. C) 20 Wb. D) 30 Wb. Show Answer Correct Answer: D) 30 Wb. 28. Which one of the following statements is correct?An electron follows a circular path when it is moving at right angles to A) A uniform magnetic field. B) A uniform electric field. C) Uniform electric and magnetic fields which are perpendicular. D) Uniform electric and magnetic fields which are in opposite directions. Show Answer Correct Answer: A) A uniform magnetic field. 29. Two capacitors are connected such that the voltage across each are the same. If the voltage is 5V and the capacitance of each is 1 microfarad, what is the total energy stored on the capacitors? A) 10 microjoules. B) 12.5 microjoules. C) 25 microjoules. D) 5 microjoules. Show Answer Correct Answer: C) 25 microjoules. 30. Electro motive force induced by motion of conductor across magnetic field is called A) Static EMF. B) EMF. C) Rotational EMF. D) Motional EMF. Show Answer Correct Answer: D) Motional EMF. 31. What is the direction of the induced voltage according to Lenz's law? A) Is independent of the flux. B) Opposes the flux causing it. C) Is perpendicular to the flux. D) Enhances the flux causing it. Show Answer Correct Answer: B) Opposes the flux causing it. 32. What is an AC Generator? A) A machine that's converts mechanical energy into alternating current electrical energy. B) A machine that's converts mechanical energy into direct current electrical energy. C) A machine that's converts electrical energy into mechanical energy. D) None of the above. Show Answer Correct Answer: A) A machine that's converts mechanical energy into alternating current electrical energy. 33. You're going camping, and you need a source of electric current. So, you buy a gasoline-powered: A) Generator. B) Motor. C) Electromagnet. D) Inducer. Show Answer Correct Answer: A) Generator. 34. A(n) ..... converts electricity into magnetism, and back to electricity. A) Electric motor. B) Electric generator. C) Electric transformer. D) Electromagnet. Show Answer Correct Answer: C) Electric transformer. 35. A coil of metal wire is kept stationary in a non-uniform magnetic field: A) An e.m.f. and current both are induced in the coil. B) An e.m.f. but not the current is induced iii the coil. C) Current but not the e.m.f is induced in the coil. D) Neither e.m.f. nor current is induced in the coil. Show Answer Correct Answer: D) Neither e.m.f. nor current is induced in the coil. 36. List one application of electromagnetic induction in everyday life. A) Solar panels. B) Electric heaters. C) Electric generators. D) Batteries. Show Answer Correct Answer: C) Electric generators. 37. In the Fleming's Right Hand Rule, the index finger stands for the ..... A) Motion. B) Field. C) Voltage. D) Current. Show Answer Correct Answer: B) Field. 38. In electromagnetic induction, what is being created? A) Mechanical energy. B) Chemical energy. C) Electrical energy. D) Magnetism. Show Answer Correct Answer: C) Electrical energy. 39. A metal rod is moved through a magnetic field. What is produced in the rod? A) A magnetic field. B) An electric current. C) Both a magnetic field and an electric current. D) None of the above. Show Answer Correct Answer: B) An electric current. 40. An e.m.f. is induced across a wire when it moves through the magnetic field between the poles ofa magnet.Which electrical device operates because of this effect? A) A generator. B) A cathode-ray tube. C) A battery. D) A motor. Show Answer Correct Answer: A) A generator. 41. What is the function of the split-ring commutator in an electric motor with a single rotating coil? A) To enable the motor to function with an a.c. source. B) To reverse the current in the coil once every revolution. C) To reverse the current in the coil whenever its plane becomes perpendicular to the magnetic field. D) To reverse the current in the coil whenever its plane is parallel with the magnetic field. Show Answer Correct Answer: C) To reverse the current in the coil whenever its plane becomes perpendicular to the magnetic field. 42. How does an electric motor function? A) A current running through a coil generates a magnetic field which pushes on a pole of a magnet. B) A moving magnet moves through a coil of wire to generate a voltage. C) A combustion reaction expels gas in the opposite direction of the motors acceleration. D) None of the above. Show Answer Correct Answer: A) A current running through a coil generates a magnetic field which pushes on a pole of a magnet. 43. The coil has a self inductance of 0.08 Henry find the magnitude of the EMF induced in that when the current flowing through it is the changing at the rate 120A/s A) -9.7v. B) 6V. C) -6V. D) -9.6V. Show Answer Correct Answer: D) -9.6V. 44. A device in which Mechanical Energy is used to create Electrical Energy A) Magnet. B) Motor. C) Generator. D) Transformer. Show Answer Correct Answer: C) Generator. 45. Type question here incl A straight wire is held perpendicular to a uniform magnetic field. If the current in the wire increases, what will happen to the magnitude of the force on the wire? A) It will increase. B) It will decrease. C) It will remain the same. D) None of the above. Show Answer Correct Answer: A) It will increase. 46. Provide the correct statements.1. EMF self-induction occurs when passing through a DC coil;2. Self-induction EMF occurs when passing through an AC coil;3. EMF self-induction counteracts current flow;4. EMF self-induction counteracts current changes. A) 2 & 4;. B) 2 & 3;. C) 1 & 4. D) 1 &3. Show Answer Correct Answer: A) 2 & 4;. 47. Which rule can be used to determine the direction of the induced current produced. A) Fleming's Left Hand Rule. B) Fleming's Right Hand Rule. C) Right Hand Grip Rule. D) None of the above. Show Answer Correct Answer: B) Fleming's Right Hand Rule. 48. Click Reverse. How does this affect the direction of the current? A) The current direction reverses. B) The current stops. C) The current direction remains the same. D) The current increases. Show Answer Correct Answer: A) The current direction reverses. 49. For a coil with N turns, the ..... is defined as the product of the magnetic flux and N. A) Magnetic Field. B) Magnetic Flux. C) Magnetic Flux Density. D) Magnetic Flux Linkage. Show Answer Correct Answer: D) Magnetic Flux Linkage. 50. What is the significance of the left side of a coil in terms of magnetic polarity? A) The left side of a coil is always the south pole regardless of current direction. B) The left side of a coil can be designated as the north pole when current flows in a specific direction, based on the right-hand rule. C) The left side of a coil has no magnetic polarity. D) The left side of a coil is neutral and does not affect magnetic fields. Show Answer Correct Answer: B) The left side of a coil can be designated as the north pole when current flows in a specific direction, based on the right-hand rule. 51. What is the function of slip rings in an AC generator? A) The function of slip rings in an AC generator is to provide a continuous electrical connection between the rotating coil and the external circuit. B) To convert AC to DC within the generator. C) To support the weight of the generator's rotor. D) To increase the voltage output of the generator. Show Answer Correct Answer: A) The function of slip rings in an AC generator is to provide a continuous electrical connection between the rotating coil and the external circuit. 52. Experiment:Turn on Show magnetic field. Position the loop over the magnet. Click Play. What do you notice? A) The loop remains stationary. B) The loop disappears. C) The loop starts to rotate. D) The loop changes color. Show Answer Correct Answer: C) The loop starts to rotate. 53. What is the difference between AC and DC in terms of generation? A) AC is generated by solar panels with a constant direction. B) AC is generated by alternators with periodic direction change, while DC is generated by batteries with a constant direction. C) DC is generated by alternators with periodic direction change. D) AC is generated by batteries with a constant direction. Show Answer Correct Answer: B) AC is generated by alternators with periodic direction change, while DC is generated by batteries with a constant direction. 54. In an experiment, a coil is moved through a magnetic field. What is observed? A) The coil heats up. B) Nothing happens. C) The coil becomes magnetized. D) A current is induced in the coil. Show Answer Correct Answer: D) A current is induced in the coil. 55. In which device is the magnetic effect of a current not used? A) Electromagnet. B) Potential divider. C) Relay. D) Loudspeaker. Show Answer Correct Answer: B) Potential divider. 56. Can you produce current in a stationary wire with a magnet that is not moving? A) Yes, having a magnet near a wire is enough to produce current in a wire. B) No, the magnetic field has to be changing to produce current in a wire. C) No, magnets cannot produce current in a wire. D) None of the above. Show Answer Correct Answer: B) No, the magnetic field has to be changing to produce current in a wire. 57. A student is experimenting with EM induction using a small magnet and a coil. Which of the following can increase the e.m.f. induced? A) Move magnet slower. B) Use coil with more turns. C) Use coil with smaller resistance. D) Use a weaker magnet. Show Answer Correct Answer: B) Use coil with more turns. 58. Primary winding of a transformer is determined by ..... A) Which winding has more turns. B) Which side has the highest voltage. C) Which winding is connected to the source. D) Which winding is nearer to the load. Show Answer Correct Answer: C) Which winding is connected to the source. 59. What does the term 'mutual inductance' refer to? A) Inductance of a single coil. B) Inductance in a closed loop. C) Inductance between two coils. D) Inductance due to a magnetic field. Show Answer Correct Answer: C) Inductance between two coils. 60. When a charged particle moves through a magnetic field, it experiences a force parallel to both its velocity and the direction of the magnetic field. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: B) False. ← PreviousNext →Related QuizzesScience QuizzesClass 12 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 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books