This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 29 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 29 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. 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) 480V. B) 30V. C) 20V. D) 450V. Show Answer Correct Answer: B) 30V. 2. 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) 32x10-16N. B) 32x10-17N. C) 32x10-18N. D) 32x10-19N. Show Answer Correct Answer: D) 32x10-19N. 3. 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 east. D) Towards west. Show Answer Correct Answer: B) Anticlockwise. 4. A sinusoidal alternating current of peak value $I_o$ A) $\frac{I_o^2R}{2}$. B) $\frac{I_o^2R}{\sqrt{2}}$. C) $I_o^2R$. D) $\sqrt{2}I_o^2R$. Show Answer Correct Answer: A) $\frac{I_o^2R}{2}$. 5. What factors affect 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 coil, resistance of the wire, thickness of the coil. C) Shape of the coil, type of insulation, presence of nearby metals. D) Color of the coil, material of the coil, length of the wire. 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. 6. 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) 0.002464 N. C) 2.46X10$^{7}$ N. D) 7.86X10$^{5}$ N. Show Answer Correct Answer: B) 0.002464 N. 7. Electromagnetic induction is due to change in ..... A) Surface area. B) Magnetic poles. C) Magnetic flux. D) Electric flux. Show Answer Correct Answer: C) Magnetic flux. 8. 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. 9. What is the effect of a coil rotating in a magnetic field? A) Increases the resistance of the coil. B) Reduces the magnetic field. C) Induces e.m.f in the coil. D) No effect on the coil. Show Answer Correct Answer: C) Induces e.m.f in the coil. 10. 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$^\circ$. 11. 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) Newton's Law of Motion. B) The Conservation of Energy. C) The Law of Thermodynamics. D) The Conservation of Charge. Show Answer Correct Answer: B) The Conservation of Energy. 12. A(n) ..... converts electricity into magnetism. A) Electric transformer. B) Electric generator. C) Electromagnet. D) Electric motor. Show Answer Correct Answer: C) Electromagnet. 13. 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. 14. 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. 15. Electromagnetic induction is change in ..... A) Surface area. B) Magnetic poles. C) Magnetic flux. D) None of the above. Show Answer Correct Answer: C) Magnetic flux. 16. In the context of electromagnetic induction, what does 'self-inductance' refer to? A) Induction between two coils. B) Induction in a closed circuit. C) Induction within the same coil. D) Induction due to external fields. Show Answer Correct Answer: C) Induction within the same coil. 17. . Lenz law is based on which of the following conservation A) Charge. B) Mass. C) Momentum. D) Energy. Show Answer Correct Answer: D) Energy. 18. 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) 0.025 V. B) 0.4 V. C) 5 V. D) 10 V. Show Answer Correct Answer: D) 10 V. 19. "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. 20. What energy transfer occurs during the motor effect? A) Electrical-Kinetic. B) Magnetic-Kinetic. C) Kinetic-Electrical. D) Chemical-Kinetic. Show Answer Correct Answer: A) Electrical-Kinetic. 21. What is the relationship between the number of turns in a coil and the induced emf? A) More turns result in less emf. B) More turns result in more emf. C) Number of turns does not affect emf. D) Emf is independent of turns. Show Answer Correct Answer: B) More turns result in more emf. 22. 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. 23. 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. 24. 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. 25. 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) 9.73 x 10$^{-5}$ H. C) 1.95 x 10$^{-4}$ H. D) 5.84 x 10$^{-3}$ H. Show Answer Correct Answer: C) 1.95 x 10$^{-4}$ H. ← 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