This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 25 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 25 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. In a closed conductive circuit contained in an alternating magnetic field, an induction current arises, the magnetic field of which is directed ..... A) Just like an external magnetic field;. B) Opposite to the outer field;. C) Perpendicular to the outer field;. D) So as to counteract changes in the external magnetic field. Show Answer Correct Answer: D) So as to counteract changes in the external magnetic field. 2. Which of the following explains Electromagnetic Induction? A) Emf is induced when there is a change in electric flux through a conductor. B) Emf is induced when there is a change in magnetic flux through a conductor. C) Current is induced when the voltage changes through a conductor. D) Voltage is induced when the current changes through a conductor. Show Answer Correct Answer: B) Emf is induced when there is a change in magnetic flux through a conductor. 3. What is/are the factor/s involved in Faraday's Law? A) Time. B) Flux. C) Number loops. D) All of the choices. Show Answer Correct Answer: D) All of the choices. 4. For an experiment, Mohammed assembled a circuit consisting of a copper coil, wires, an open switch and a sensitive ammeter.A magnet is pushed into the coil.Which of these occur during this experiment? A) Current flow and deflection in ammeter. B) E.M.F induced and deflection in ammeter. C) E.m.f induced, current flow and deflection in ammeter. D) None of them. Show Answer Correct Answer: D) None of them. 5. According to Lenz's Law, the direction of the induced current in a closed loop is such that it will ..... A) Enhance the change in magnetic flux. B) Oppose the change in magnetic flux. C) Have no effect on the magnetic flux. D) Double the magnetic flux. Show Answer Correct Answer: B) Oppose the change in magnetic flux. 6. Who showed that an electric current can be produced in an conductor with the help of moving magnet??? A) Albert Einstein. B) Issac Newton. C) Michael Faraday. D) Homi J. Bhabha. Show Answer Correct Answer: C) Michael Faraday. 7. A coil of 100 turns has a magnetic flux of 0.02 Wb passing through it. If the flux changes to 0.08 Wb in 0.1 seconds, the induced e.m.f. is A) 6 V. B) 60 V. C) 600 V. D) 6000 V. Show Answer Correct Answer: B) 60 V. 8. What is the equation for electrical power A) Electrical power = current / p.d.P = I / V. B) Electrical power = current x p.d.P = I x V. C) Electrical power = current + p.d.P = I + V. D) None of the above. Show Answer Correct Answer: B) Electrical power = current x p.d.P = I x V. 9. The current through a 1 mH coil drops from 5A to 3A in 3*10$^{-2}$ second.The emf developed in the coil is ..... A) 2*10$^{-6}$ V. B) 8*10$^{-6}$ V. C) 2V. D) 8V. Show Answer Correct Answer: C) 2V. 10. When current increases in a coil, the induced current will be A) In the same direction. B) In the opposite direction. C) Clockwise. D) Anticlockwise. Show Answer Correct Answer: B) In the opposite direction. 11. You have an imaginary, closed box. If you measure the total electric flux going out of the box and find that it is zero, what can you say for sure? A) There are absolutely no charges inside the box. B) The net (total) charge inside the box is zero. C) The box must be made of a conducting material. D) The electric field is zero everywhere inside the box. Show Answer Correct Answer: B) The net (total) charge inside the box is zero. 12. If a secondary coil has 40 turns, and, a primary coil with 20 turns is charged with 50 V of potential difference, then potential difference in secondary coil would be A) 50 V in secondary coil. B) 25 V in secondary coil. C) 60 V in secondary coil. D) 100 V in secondary coil. Show Answer Correct Answer: D) 100 V in secondary coil. 13. The north pole of a bar magnet is moving towards the coil along the axis passing through the centre of coil and perpendicular to the plane of coil. The direction of induced current in the coil when viewed from the opposite direction of the motion of the magnet is A) Clockwise. B) Anticlockwise. C) No current in the coil. D) Data insufficient. Show Answer Correct Answer: A) Clockwise. 14. Sebuah dinamo sepeda terdiri atas 1000 lilitan. Dinamo dihubungkan dengan roda sedemikian sehingga putaran roda sama dengan putaran poros kumparan. Ketika roda berputar dengan 30 putaran per menit, ternyata tegangan yang dihasilkan adalah 10 V. Jika luas penampang kumparan pada dinamo 20 cm$^{2}$, maka kuat medan magnet yang digunakan pada dinamo tersebut adalah ..... A) 0, 2 T. B) 1, 1 T. C) 0, 3 T. D) 0, 5 T. E) 2, 2 T. Show Answer Correct Answer: B) 1, 1 T. 15. A transformer has 5 turns on the secondary side and 25 turns on the primary side. If the primary voltage is 110 v what is the secondary voltage? A) 550 V. B) 22 V. C) 220 V. D) 55 V. Show Answer Correct Answer: B) 22 V. 16. How would you reverse the direction of the current flowing through the coil in Faraday's experiment? A) Use a magnet of opposite polarity. B) Move the magnet through the coil faster. C) Reverse the magnet's direction. D) Use a larger magnet. Show Answer Correct Answer: C) Reverse the magnet's direction. 17. To repel means ..... A) To push away. B) A force created by magnets that pulls some metals. C) To Pull towards. D) An object able to pull some metals towards itself. Show Answer Correct Answer: A) To push away. 18. How does the back emf compare to the original emf? A) It is always less than the original emf. B) It is equal to the original emf. C) It may be many times greater than the original emf. D) It is unrelated to the original emf. Show Answer Correct Answer: C) It may be many times greater than the original emf. 19. How is the energy stored in an inductor when a current is flowing through it? A) Stored in the magnetic field created by the current. B) Stored in the electric field created by the current. C) Stored in the current flowing though the inductor. D) Stored in the power supply by directing the current back to the power supply. Show Answer Correct Answer: A) Stored in the magnetic field created by the current. 20. Assume primary has 240 turns and secondary has 60 turns. Primary is connected with 120V AC power supply. What is the voltage on the secondary? A) 30 V. B) 0.333 V. C) 2 V. D) 120V. Show Answer Correct Answer: A) 30 V. 21. How does the function of a generator relate to the function of a motor? A) They are the same. B) They are opposites. C) They both work the same way. D) They are not related at all. Show Answer Correct Answer: B) They are opposites. 22. . How to increase the energy stored in an inductor by four times? A) By doubling the current. B) This is not possible. C) By doubling the inductance. D) By making current 2 times. Show Answer Correct Answer: A) By doubling the current. 23. A class is designing a d.c. motor. To achieve a greater turning effect, three suggestions are made. 1. Have a larger current in the coil of the motor. 2. Have a stronger magnet in the motor. 3. Put a larger number of turns on the coil. Which suggestions will help to increase the turning effect? A) 1, 2 and 3. B) 1 and 2 only. C) 1 and 3 only. D) 2 and 3 only. Show Answer Correct Answer: A) 1, 2 and 3. 24. How does the number of turns in a coil affect the induced electromotive force (emf)? A) It decreases. B) It creates a magnetic field. C) It has no effect. D) It increases. Show Answer Correct Answer: D) It increases. 25. Magnetic fields are created by moving ..... A) Atoms. B) Protons. C) Electric Charges. D) Metals. Show Answer Correct Answer: C) Electric Charges. ← 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