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 2 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 2 (60 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Straight body posture shows what? A) Humility. B) Professionalism. C) Pride. D) Confidence. Show Answer Correct Answer: D) Confidence. 2. What do you need to build a working electric motor? A) An extremely large magnet. B) A source of electricity. C) A wire that's at least 5 meters long. D) Fuel that can be burned. Show Answer Correct Answer: B) A source of electricity. 3. A ..... is an electrical device that converts AC electricity from one voltage level to another A) Center tap. B) Secondary coil. C) Transformer. D) Primary coil. Show Answer Correct Answer: C) Transformer. 4. What cause-and-effect statement best describes what happens in a motor? A) A changing magnetic field causes current to be produced in a wire. B) A current carrying wire causes a magnetic field to be produced around the wire. C) All the above. D) None of the above. Show Answer Correct Answer: B) A current carrying wire causes a magnetic field to be produced around the wire. 5. Faraday's Law uses which of the following to determine the EMF? A) Number of turns in a coil and the rate of change in the magnetic field. B) The voltage of the bulb and coulomb's constant. (k). C) The magnetic field and the oven door. D) The rotation of the coil and Lenz' postulate. Show Answer Correct Answer: A) Number of turns in a coil and the rate of change in the magnetic field. 6. What is the potential difference between the live and neutral wires in a domestic circuit in India? A) 440 V. B) 660 V. C) 110 V. D) 220 V. Show Answer Correct Answer: D) 220 V. 7. A step up transformer ..... A) Decreases voltage. B) Increases power. C) Increases frequency. D) Decreases current. Show Answer Correct Answer: D) Decreases current. 8. In physics, to "induce" something is to: A) Create it. B) Reverse its direction. C) Make it more powerful. D) Turn it into something else. Show Answer Correct Answer: A) Create it. 9. What does the formula for self induction express? A) Capacitance in a capacitor. B) Voltage induced in a coil. C) Resistance in a circuit. D) Power in a resistor. Show Answer Correct Answer: B) Voltage induced in a coil. 10. Compare and contrast AC and DC generators in terms of electromagnetic induction. A) AC generators use brushes, DC generators use stationary magnetic field. B) AC generators use stationary magnetic field, DC generators use slip rings. C) AC generators use commutator, DC generators use rotating magnetic field. D) AC generators use rotating magnetic field, DC generators use commutator. Show Answer Correct Answer: D) AC generators use rotating magnetic field, DC generators use commutator. 11. What is AC stands for in AC Generator A) Alternating Current. B) Advance Current. C) Alternate Click. D) Advance Circle. Show Answer Correct Answer: A) Alternating Current. 12. Which material is most suitable for the core of a transformer? A) Air. B) Plastic. C) Iron. D) Cardboard. Show Answer Correct Answer: C) Iron. 13. At the instant when the current is 9.0 A, a magnetic flux of 2.5 $\times10^{-3}$ A) 11.3 J. B) 40.5 J. C) 10.3 J. D) 22.5 J. Show Answer Correct Answer: A) 11.3 J. 14. Electric currents produce ..... A) Magnetic fields. B) Sound waves. C) Electron clouds. D) Light waves. Show Answer Correct Answer: A) Magnetic fields. 15. In a generator, how can we increase the induced current? A) Use a thinner wire. B) Use a weaker magnetic field. C) Move the conductor faster through the magnetic field. D) Decrease the number of turns in the coi. Show Answer Correct Answer: C) Move the conductor faster through the magnetic field. 16. According to the Right Hand Rule, where is the magnetic field generated around a current-carrying wire? A) Perpendicular to the wire. B) Parallel to the wire. C) All the above. D) None of the above. Show Answer Correct Answer: A) Perpendicular to the wire. 17. Describe the factors affecting the induced emf in a coil. A) The color of the coil affects the induced emf. B) The temperature of the surrounding air influences the induced emf. C) The length of the wire used in the coil determines the induced emf. D) The factors affecting the induced emf in a coil include the rate of change of magnetic flux, number of turns in the coil, strength of the magnetic field, orientation of the coil, and resistance of the coil. Show Answer Correct Answer: D) The factors affecting the induced emf in a coil include the rate of change of magnetic flux, number of turns in the coil, strength of the magnetic field, orientation of the coil, and resistance of the coil. 18. A circular loop of radius 2cm, is placed in a time varing magnetic field with rate of 2T/sec. Then induced electric field in this loop will be A) 0.04 V. B) 0.4V. C) 4 mV. D) 0.12 V. Show Answer Correct Answer: A) 0.04 V. 19. Which rule is used to determine the direction of current flow when a conductor is cut across the magnetic field line A) Fleming's left hand rule. B) Fleming's right hand rule. C) Right hand grips rule. D) Faraday's palm rule. Show Answer Correct Answer: B) Fleming's right hand rule. 20. If the magnet falls from a certain height through the opening of the closed coil, then the acceleration of the magnet ..... A) Is modular constant and equals free fall acceleration;. B) Modulus of steel and greater than free fall acceleration;. C) Modulus constant and less than free fall acceleration;. D) Changes in modulus and less than the acceleration of free fall. Show Answer Correct Answer: D) Changes in modulus and less than the acceleration of free fall. 21. A coil of resistance 400 ohm is placed in a magnetic field. If the magnetic flux linked with the coil varies with time (t) as $\phi=50t^2+4$ A) 0.5 A. B) 1.5 A. C) 0.1 A. D) 5 A. Show Answer Correct Answer: A) 0.5 A. 22. What is Lenz's Law? A) Induced current enhances the change that caused it. B) Induced current opposes the change that caused it. C) Induced current is independent of magnetic fields. D) Induced current is always zero. Show Answer Correct Answer: B) Induced current opposes the change that caused it. 23. Eddy currents can be used to heat localised tissues of the human body. This branch of medical therapy is called A) Hyperthermia. B) Diathermy. C) Inductothermy. D) None of these. Show Answer Correct Answer: C) Inductothermy. 24. The unit of magnetic flux is the A) Faraday. B) Henry. C) Tesla. D) Weber. Show Answer Correct Answer: D) Weber. 25. Self-induced EMF is sometimes also known as A) Induced EMF. B) Deduce EMF. C) Back EMF. D) Both a and b. Show Answer Correct Answer: C) Back EMF. 26. A wire carries a current of 2 A over a period of 30 seconds. What total charge moves through the wire in this time interval? A) 0.0666 C. B) 15 C. C) 120 C. D) 60 C. Show Answer Correct Answer: D) 60 C. 27. What happens to the direction of the potential difference when the direction of the wire movement changes? A) The direction of the potential difference remains the same. B) The potential difference disappears. C) The direction of the potential difference swaps. D) The potential difference increases. Show Answer Correct Answer: C) The direction of the potential difference swaps. 28. The principle of electromagnetic induction is used in which of the following devices? A) Electric bulb. B) Induction cooker. C) Electric heater. D) Electric fan. Show Answer Correct Answer: B) Induction cooker. 29. ..... Law says that the Induced current is proportional to the change of magnetic flux A) Lenz'. B) Faraday's. C) Ampere's. D) None of the above. Show Answer Correct Answer: B) Faraday's. 30. Will a transformer work with direct current (d.c.) or alternating current (a.c.)? A) A.c. only. B) D.c. only. C) Both a.c. and d.c. D) None of the above. Show Answer Correct Answer: A) A.c. only. 31. What is the direction of induced current when a magnet is moved towards a coil? A) The induced current flows in the same direction as the magnet's movement. B) The induced current flows in the opposite direction to the magnet's movement. C) The induced current flows in a direction that opposes the change in magnetic flux, according to Lenz's Law. D) The induced current does not flow at all when the magnet is moved. Show Answer Correct Answer: C) The induced current flows in a direction that opposes the change in magnetic flux, according to Lenz's Law. 32. The function of a mains transformer is to convert A) A low value alternating voltage to a high value direct voltage. B) One direct voltage to another direct voltage of different magnitude. C) A high value alternating voltage to a low value direct voltage. D) One alternating voltage to another alternating voltage of different magnitude. Show Answer Correct Answer: D) One alternating voltage to another alternating voltage of different magnitude. 33. What is Faraday's Law of Electromagnetic Induction? A) A change in electric field induces an electromotive force (EMF) in a closed circuit. B) Faraday's Law states that magnetic fields are not related to induced EMF. C) A change in magnetic field induces an electromotive force (EMF) in a closed circuit. D) Electromagnetic Induction only occurs in open circuits. Show Answer Correct Answer: C) A change in magnetic field induces an electromotive force (EMF) in a closed circuit. 34. A transformer designed to step-down 240 V mains voltage to a voltage of 6 V AC. Calculate the number of turns on the secondary coil, given that the primary coil has 2000 turns. A) 20 turns. B) 50 turns. C) 200 turns. D) 150 turns. Show Answer Correct Answer: B) 50 turns. 35. What is a generator? A) A system that generates heat energy from solar power. B) A machine that stores electrical energy for later use. C) A device that converts mechanical energy into electrical energy using electromagnetic induction. D) A tool used to measure electrical resistance. Show Answer Correct Answer: C) A device that converts mechanical energy into electrical energy using electromagnetic induction. 36. What factors affect the magnitude of induced EMF? A) Temperature of the environment. B) Rate of change of magnetic flux, strength of magnetic field, area of the loop, orientation of the loop. C) Length of the wire in the loop. D) Type of conductor used. Show Answer Correct Answer: B) Rate of change of magnetic flux, strength of magnetic field, area of the loop, orientation of the loop. 37. In Transformer Ratio of voltages is equal to ratio of ..... A) Number of electromagnetic. B) Number of turns in coil. C) Number of iron sheets in core. D) Number of coil. Show Answer Correct Answer: B) Number of turns in coil. 38. What is the unit for magnetic flux? A) Weber (Wb). B) Tesla (T). C) Henry (H). D) Volt (V). Show Answer Correct Answer: A) Weber (Wb). 39. A diamagnetic material in a magnetic field moves A) From weaker to the stronger parts of the field. B) Perpendicular to the field. C) From stronger to the weaker parts of the field. D) In none of the above directions. Show Answer Correct Answer: C) From stronger to the weaker parts of the field. 40. A square coil, enclosing an area with sides 5.0 cm long, is wrapped with 1500 turns of wire. A uniform magnetic field perpendicular to its plane is turned on and increases to 0.85 T during an interval of 3.0 s. What average voltage is induced in the coil? A) 0.25 V. B) 0.97 V. C) 1.24 V. D) 0.55 V. E) 1.06 V. Show Answer Correct Answer: E) 1.06 V. 41. A wheel with 10 metallic spokes each 0.5m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component (H) of Earth's magnetic field at a place. If H = 0.4 G at the place, what is the induced emf between the axle and the rim of the wheel> A) $0.628\times10^{-5}V$. B) $62.8\times10^{-5}V$. C) $6.28\times10^{-5}V$. D) $628\times10^{-5}V$. Show Answer Correct Answer: C) $6.28\times10^{-5}V$. 42. A transformer has 200 turns on its primary coil and is connected to a 240 V a.c. supply. The output voltage of the transformer is 60 V a.c ..... How many turns are on the secondary coil of the transformer? A) 800. B) 20. C) 50. D) 72. Show Answer Correct Answer: C) 50. 43. The working of speedometers of trains is based on A) Pulsating currents. B) Wattless currents. C) Eddy currents. D) Alternating currents. Show Answer Correct Answer: C) Eddy currents. 44. A moving electron enters a uniform and perpendicular magnetic field inside the magnetic field the electron travels along A) Hyperbola. B) A straight line. C) Parabola. D) A circle. Show Answer Correct Answer: D) A circle. 45. An e.m.f is produced in a coil, which is not connected to an external voltage source. This is not due to A) The coil being in a time varying magnetic field. B) The coil moving in a time varying magnetic field. C) The coil moving in a constant magnetic field. D) The coil is stationary in external spatially varying magnetic field, which does not change with time. Show Answer Correct Answer: D) The coil is stationary in external spatially varying magnetic field, which does not change with time. 46. What is created when a magnet moves through a coil of wire? A) A ferromagnet. B) An electric current. C) An electromagnet. D) A solenoid. Show Answer Correct Answer: B) An electric current. 47. How does a wind generator work? A) By using the power of wind to rotate blades connected to a generator, producing electricity. B) By using solar panels to convert sunlight into electricity. C) By using water flow to turn turbines and generate electricity. D) By using geothermal heat to produce steam and drive a generator. Show Answer Correct Answer: A) By using the power of wind to rotate blades connected to a generator, producing electricity. 48. When an electric current runs through a wire, a magnetic field is induced ..... A) Around the wire. B) Parallel to the wire. C) Under the wire. D) Through the wire. Show Answer Correct Answer: A) Around the wire. 49. What type of core is mentioned in the context of self inductance? A) Iron cored. B) Plastic cored. C) Copper cored. D) Air cored. Show Answer Correct Answer: D) Air cored. 50. Magnetic flux density has the units: A) T m$^{-1}$. B) Wb m$^{-2}$. C) Wb A$^{-1}$ m$^{-1}$. D) T m. Show Answer Correct Answer: B) Wb m$^{-2}$. 51. Lenz' Law is used to determine the ..... A) Charge. B) Power. C) Magnitude. D) Direction. Show Answer Correct Answer: D) Direction. 52. A transformer has a secondary coil with 500 windings and is supplied with 200 volts. The primary coil is supplied with 100 volts. How many windings are in the primary coil? A) 500 windings. B) 750 windings. C) 250 windings. D) 1000 windings. Show Answer Correct Answer: C) 250 windings. 53. Force on a conductor carrying a current = 1.32 N, current = 4 A, length = 3.88 m, magnetic flux density =? A) 1.17. B) 0.317. C) 0.0851. D) 0.106. Show Answer Correct Answer: C) 0.0851. 54. The direction of induced emf or current is indicated by: A) Fleming's left-hand rule. B) Fleming's right-hand rule. C) Faraday's law of electromagnetic induction. D) Ampere's swimming rule. Show Answer Correct Answer: B) Fleming's right-hand rule. 55. When a charged particle is projected perpendicular to a uniform magnetic field it describes a circular path in which A) Its velocity remains constant. B) Its speed remains constant. C) Its kinetic energy remains constant. D) Its kinetic energy remains constant. Show Answer Correct Answer: B) Its speed remains constant. 56. If you reverse the direction of movement of a magnet influencing a coil, what happens to the current? A) Stays same. B) Increases. C) Reverses. D) Decreases. Show Answer Correct Answer: C) Reverses. 57. Observe:Move the wire loop down, towards the magnet. Is the magnetic flux increasing or decreasing as you do this? A) No change. B) Constant. C) Fluctuating. D) Decreasing. E) Increasing. Show Answer Correct Answer: D) Decreasing. 58. DC stands for ..... current. A) Default. B) Deviating. C) Direct. D) Diverging. Show Answer Correct Answer: C) Direct. 59. A coil is moved perpendicular to a magnetic field. What is the effect on the induced EMF if the speed of movement is halved? A) The EMF is quadrupled. B) The EMF is doubled. C) The EMF is halved. D) The EMF remains the same. Show Answer Correct Answer: C) The EMF is halved. 60. The transformer is a device used to ..... the value of a voltage. A) Change. B) Steady. C) Anchor. D) Resist. Show Answer Correct Answer: A) Change. ← 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 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 9 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books