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 12 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 12 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. According to the Lenz's Law, A) The induced e.m.f is proportional to the magnetic field. B) The direction of the induced e.m.f is such that it will oppose the change causing it. C) Fleming's Left hand rule can be used to determine the direction of induced e.m.f. D) The induced e.m.f is always in opposite direction to the magnetic field. Show Answer Correct Answer: B) The direction of the induced e.m.f is such that it will oppose the change causing it. 2. What is the purpose of lamination in the core of a transformer? A) To increase eddy current losses. B) To increase hysteresis losses. C) To decrease hysteresis losses. D) To decrease eddy current losses. Show Answer Correct Answer: D) To decrease eddy current losses. 3. Describe a practical example of Faraday's law in action. A) Electric generators convert mechanical energy into electrical energy using Faraday's law. B) Solar panels operate based on Faraday's law principles. C) Electric cars use Faraday's law to charge batteries. D) Transformers increase voltage using Faraday's law. Show Answer Correct Answer: A) Electric generators convert mechanical energy into electrical energy using Faraday's law. 4. The induced e.m, f in a coil does not depend on A) The number of turns in the coil. B) Time of rotation. C) The resistance of the circuit. D) The rate of change of magnetic flux. Show Answer Correct Answer: C) The resistance of the circuit. 5. As the loop rotates, why is a current induced in the loop? A) Due to the loop's material. B) As a result of the loop's shape. C) Due to the change in magnetic flux through the loop. D) Because of the loop's resistance. Show Answer Correct Answer: C) Due to the change in magnetic flux through the loop. 6. AC Generator:As the loop rotates clockwise, it cuts across decreasing number of field lines until it becomes zero when the armature is vertical. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 7. A coil spins in a magnetic field. Of the followingwhich causes an increase in the induced EMF inthe coil? A) Keeping the flux at a constant rate. B) Decreasing the number of turns of wire inthe coil. C) Spinning the coil faster. D) Removing the coil from the magnetic field. Show Answer Correct Answer: C) Spinning the coil faster. 8. When 0.5A current passes through an inductor coil, the flux linked with it is 0.15Wb .The self inductance of the coil is A) 0.3H. B) 0.45H. C) 3H. D) 0.2H. Show Answer Correct Answer: A) 0.3H. 9. What is another name for the generator effect? A) Magnetic resistance. B) Electromagnetic induction. C) Electric displacement. D) None of the above. Show Answer Correct Answer: B) Electromagnetic induction. 10. What is self-induction? A) Induction that requires two coils. B) Induction that does not involve current. C) Induction of voltage in a current-carrying wire. D) Induction caused by external magnetic fields. Show Answer Correct Answer: C) Induction of voltage in a current-carrying wire. 11. State how a moving coil galvanometer can be converted into an ammeter A) By connecting a shunt in parallel with its coil. B) By connecting a shunt in perpendicular with its coil. C) All the above. D) None of the above. Show Answer Correct Answer: A) By connecting a shunt in parallel with its coil. 12. Which of the following is NOT effect the magnitude of magnetic field intensity of the circular coil? A) Number of coil. B) Diameter of circular coil. C) Current flow in the coil. D) Magnetic poles. Show Answer Correct Answer: D) Magnetic poles. 13. How does the magnetic flux change as the magnet rises? A) It decreases. B) It fluctuates. C) It increases. D) It remains constant. Show Answer Correct Answer: A) It decreases. 14. The phenomenon of self-induction occurs in a single coil. This effect is related to which of the following? A) Mutual inductance. B) Self-inductance. C) Both A and B. D) Neither A nor B. E) None of these. Show Answer Correct Answer: B) Self-inductance. 15. In a transformer, if the number of turns in the primary coil is greater than in the secondary coil, what type of transformer is it? A) Isolation transformer. B) Variable transformer. C) Step-down transformer. D) Step-up transformer. Show Answer Correct Answer: C) Step-down transformer. 16. The value of self inductance of a coil is 5H. The value of current changes from 1A to 2A in 5 sec., then value of induced emf in it- A) 1.0V. B) 0.1V. C) 100V. D) 10V. Show Answer Correct Answer: A) 1.0V. 17. A transformer has 100 turns in the primary coil and 25 turns in the secondary coil. When a 120 V is applied to the primary coil, what is the voltage in the secondary coil? A) 30V. B) 450V. C) 20V. D) 480V. Show Answer Correct Answer: A) 30V. 18. PQ is a long a straight conductor carrying a current of 3A as shown in the figure. An electron moves with a velocity of 2 x 10 7 m/s parallel to it. find the force acting on the electron A) 32x10-17N. B) 32x10-18N. C) 32x10-16N. D) 32x10-19N. Show Answer Correct Answer: D) 32x10-19N. 19. The north pole of a bar magnet is moved towards a metal ring what is the direction of induced current in the ring when viewed from a metal side A) Clockwise. B) Anticlockwise. C) Towards west. D) Towards east. Show Answer Correct Answer: B) Anticlockwise. 20. A sinusoidal alternating current of peak value $I_o$ A) $\frac{I_o^2R}{2}$. B) $\sqrt{2}I_o^2R$. C) $I_o^2R$. D) $\frac{I_o^2R}{\sqrt{2}}$. Show Answer Correct Answer: A) $\frac{I_o^2R}{2}$. 21. What factors affect the magnitude of induced EMF in a coil? A) Color of the coil, material of the coil, length of the wire. B) Temperature of the coil, resistance of the wire, thickness of the coil. C) Shape of the coil, type of insulation, presence of nearby metals. D) Number of turns, strength of magnetic field, area of the coil, rate of change of magnetic field, orientation of the coil. Show Answer Correct Answer: D) Number of turns, strength of magnetic field, area of the coil, rate of change of magnetic field, orientation of the coil. 22. A 4.0 m long cord is lying perpendicular to Earth's magnetic field of 5.6X10$^{-5}$ T. If the cord is carrying a current of 11.0 A, what magnetic force is acting on the cord? A) 2.03X10$^{-5}$ N. B) 2.46X10$^{7}$ N. C) 7.86X10$^{5}$ N. D) 0.002464 N. Show Answer Correct Answer: D) 0.002464 N. 23. Electromagnetic induction is due to change in ..... A) Magnetic poles. B) Surface area. C) Magnetic flux. D) Electric flux. Show Answer Correct Answer: C) Magnetic flux. 24. Electromagnetism is when A) Magnetism causes electricity. B) Electricity causes magnetism. C) Electricity and magnetism cancel each other out. D) A strong magnet creates a permanent magnet. Show Answer Correct Answer: A) Magnetism causes electricity. 25. What is the effect of a coil rotating in a magnetic field? A) No effect on the coil. B) Increases the resistance of the coil. C) Induces e.m.f in the coil. D) Reduces the magnetic field. Show Answer Correct Answer: C) Induces e.m.f in the coil. 26. What is the relationship between the angle of the coil and the induced emf in an AC generator? A) Emf is zero at all angles. B) Emf is constant regardless of angle. C) Emf is maximum at 90$^\circ$ and 270$^\circ$. D) Emf is maximum at 0$^\circ$ and 180$^\circ$. Show Answer Correct Answer: C) Emf is maximum at 90$^\circ$ and 270$^\circ$. 27. The ultimate reason why Lenz's Law must be true (that the induced current must oppose the change) is to satisfy which fundamental law of physics? A) The Law of Thermodynamics. B) The Conservation of Energy. C) Newton's Law of Motion. D) The Conservation of Charge. Show Answer Correct Answer: B) The Conservation of Energy. 28. A coil of insulated copper wire is connected to a galvanometer forming a loop and a magnet is:A:Held stationaryB:Moved away along its axisC:Moved towards along its axisThere will be a induced current in: A) A only. B) A and B only. C) B and C only. D) A, B and C. Show Answer Correct Answer: C) B and C only. 29. Which of the following is the best method to reduce eddy currents? A) Laminating core. B) Using thick wires. C) By reducing hysteresis loss. D) None of these. Show Answer Correct Answer: A) Laminating core. 30. In the context of electromagnetic induction, what does 'self-inductance' refer to? A) Induction between two coils. B) Induction within the same coil. C) Induction due to external fields. D) Induction in a closed circuit. Show Answer Correct Answer: B) Induction within the same coil. 31. . Lenz law is based on which of the following conservation A) Mass. B) Charge. C) Momentum. D) Energy. Show Answer Correct Answer: D) Energy. 32. A square loop is placed in a uniform magnetic field perpendicular to the plane of the loop as shown. The loop is 0.50 meter2 on a side and the magnetic field B has a strength of 2 T. If the loop is rotated through an angle of 90$^\circ$ in 0.1 second what would be the average induced emf in the loop? A) 5 V. B) 10 V. C) 0.025 V. D) 0.4 V. Show Answer Correct Answer: B) 10 V. 33. "An induced current always flow in a direction that opposes the change in magnetic flux that causes it" . this is the statement for? A) Fleming's left hand rule. B) Fleming's right hand rule. C) Faraday's law. D) Lenz's law. Show Answer Correct Answer: D) Lenz's law. 34. What energy transfer occurs during the motor effect? A) Kinetic-Electrical. B) Chemical-Kinetic. C) Electrical-Kinetic. D) Magnetic-Kinetic. Show Answer Correct Answer: C) Electrical-Kinetic. 35. What is the relationship between the number of turns in a coil and the induced emf? A) Emf is independent of turns. B) Number of turns does not affect emf. C) More turns result in less emf. D) More turns result in more emf. Show Answer Correct Answer: D) More turns result in more emf. 36. What is the job of a transformer? A) Change the current of a power supply. B) Change the potential difference (voltage) of a power supply. C) Adds a resistor. D) None of the above. Show Answer Correct Answer: B) Change the potential difference (voltage) of a power supply. 37. You drop a small, non-magnetic piece of copper through a copper pipe. What happens? A) It falls very slowly due to Lenz's Law. B) It is repelled out of the top of the pipe. C) It falls normally, accelerating due to gravity. D) It stops in the middle of the pipe. Show Answer Correct Answer: C) It falls normally, accelerating due to gravity. 38. What are the three things needed to generate electricity according to the video? A) A magnet, a coil of wire, and sunlight. B) A battery, a coil of wire, and movement. C) A magnet, a coil of wire, and movement. D) A magnet, a battery, and movement. Show Answer Correct Answer: C) A magnet, a coil of wire, and movement. 39. A small coil with 100 turns of cross-sectional area 1.26 x 10$^{-3 }$m$^{2}$ is placed coaxially at the centre of a solenoid with 3000 turns and length 2.44 m. What is the mutual inductance between the solenoid and the coil? A) 6.49 x 10$^{-6}$ H. B) 1.95 x 10$^{-4}$ H. C) 9.73 x 10$^{-5}$ H. D) 5.84 x 10$^{-3}$ H. Show Answer Correct Answer: B) 1.95 x 10$^{-4}$ H. 40. Why is a galvanometer used in an electromagnetic induction setup? A) To help the current to flow across the conductor. B) To maintain the amount of current in the conductor. C) To detect the flow of charges. D) To provide charges in the conductor. Show Answer Correct Answer: C) To detect the flow of charges. 41. Which of the following increases frequency of AC? A) Rotating the coil faster. B) Using a stronger magnet. C) Increase area of the coil. D) Increasing number of turns on the coil. Show Answer Correct Answer: A) Rotating the coil faster. 42. When a co-worker borrows your phone charger regularly and forgets to return it to you, do you: A) Drop hints at regular intervals. B) Let it go. C) Explain the effect it has on your work, and ask for it back. D) Get angry and demand it back. Show Answer Correct Answer: C) Explain the effect it has on your work, and ask for it back. 43. A coil of wire of 10 turns has across sectional area of 0.08 m2. A magnetic field of 0.4T passes through the coil perpendicular to the plane of the coil. What is the total magnetic flux through the coil? A) 0.32 Wb. B) 0.16 wb. C) 0.27 Wb. D) 0 Wb. Show Answer Correct Answer: A) 0.32 Wb. 44. Motors start with ..... energy and end with ..... energy A) Electric, magnetic. B) Electric, kinetic. C) Kinetic, electric. D) Potential, magnetic. Show Answer Correct Answer: B) Electric, kinetic. 45. What type of core material is used in transformers to decrease losses? A) Iron. B) Air. C) Copper. D) Silver. E) Steel. Show Answer Correct Answer: A) Iron. 46. Can you give an example of an application of electromagnetic induction? A) Induction cooktops rely on electromagnetic induction to cool food quickly. B) Transformers convert electrical energy into mechanical energy using electromagnetic induction. C) Electric heaters use electromagnetic induction to generate heat. D) Electric generators convert mechanical energy into electrical energy using electromagnetic induction. Show Answer Correct Answer: D) Electric generators convert mechanical energy into electrical energy using electromagnetic induction. 47. What is the unit of magnetic flux, which is crucial in electromagnetic induction? A) Weber. B) Tesla. C) Henry. D) Farad. Show Answer Correct Answer: A) Weber. 48. What is necessary to induce a voltage in a wire? A) The wire must be stationary. B) The wire must move along the magnetic field lines. C) The wire must cut through magnetic field lines. D) The wire must be insulated. Show Answer Correct Answer: C) The wire must cut through magnetic field lines. 49. Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought nearer. The current in A) P increases while in Q decreases. B) Q increases while in P decreases. C) Both P and Q increases. D) Both P and Q decreases. Show Answer Correct Answer: D) Both P and Q decreases. 50. What type of current do transformers use? A) Static current. B) Alternating current. C) Direct current. D) Pulsating current. Show Answer Correct Answer: B) Alternating current. 51. A wire of length 150 cm carrying an electric current of 0.1 A experiences a force of 6.0X10$^{-3}$ N in a magnetic field. Find the magnitude of the magnetic field. A) 9.0X10$^{-5}$ T. B) 4.0X10$^{-4}$ T. C) 4.0 T. D) 0.04 T. Show Answer Correct Answer: D) 0.04 T. 52. Metal detectors installed for security purposes are based on the principle of A) Electromagnetic difference. B) Potential difference. C) Potential energy. D) Electromagnetic induction. Show Answer Correct Answer: D) Electromagnetic induction. 53. Which of the following principles is the basis for electromagnetic induction? A) Coulomb's Law. B) Ohm's Law. C) Newton's Third Law. D) Faraday's Law. Show Answer Correct Answer: D) Faraday's Law. 54. Faraday's Law is used to determine the ..... A) Charge. B) Power. C) Direction. D) Magnitude. Show Answer Correct Answer: D) Magnitude. 55. Which of the following will not influence the magnetic force acting on a current-carrying conductor? A) The speed of the conductor. B) Length of the conductor. C) Magnetic field strength. D) The current flowing in the conductor. Show Answer Correct Answer: A) The speed of the conductor. 56. What is the consequence/result of motor effect? A) Voltage. B) Electromagnetic induction. C) Current. D) Electromotive force. Show Answer Correct Answer: B) Electromagnetic induction. 57. Magnetic field changes at the rate ot 0.4 T/sec. in a square coil ot side 4 cm. kept perpendicular to the field. It the resistance ot the coil is 2x 10 2, then induced curent in coil is: A) 3.2 A. B) 0.16 A. C) 0.32 A. D) 1.6 A. Show Answer Correct Answer: B) 0.16 A. 58. A coil of wire of 20 turns has across sectional area of 0.1 m$^{2}$. A magnetic field of 0.5T passes through the coil parallel to the plane of the coil. What is the total magnetic flux through the coil? A) 0 Wb. B) 0.5 Wb. C) 0.86 Wb. D) 1 Wb. Show Answer Correct Answer: A) 0 Wb. 59. A motor is a device that ..... A) Converts electrical energy into kinetic energy. B) Converts mechanical energy into kinetic energy. C) Converts electrical energy into mechanical energy. D) Converts mechanical energy into electrical energy. Show Answer Correct Answer: C) Converts electrical energy into mechanical energy. 60. Which of the following correctly, relates the units for magnetic flux and magnetic flux density? A) 1 Wb = 1 T m$^{-2}$. B) 1 Wb = 1 T m$^{3}$. C) 1 Wb = 1 T m$^{2}$. D) 1 Wb = 1 T m$^{-3}$. Show Answer Correct Answer: C) 1 Wb = 1 T m$^{2}$. ← 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 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 8 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books