This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 21 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 21 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. Besarnya ggl induksi yang dihasilkan sebuah dinamo dipengaruhi oleh faktor-faktor berikut ini, kecuali ..... A) Panjang kumparan. B) Kuat medan magnet yang digunakan. C) Kecepatan putaran kumparan. D) Jumlah lilitan kumparan. E) Luas penampang kumparan. Show Answer Correct Answer: A) Panjang kumparan. 2. The electricity delivered to our homes from power stations is transmitted at high voltages and low currents because A) It is safer for engineers to repair the overhead cables. B) It is cost effective in terms of energy lost. C) Electricity can travel faster along the cables. D) It reduces the resistance of the cables. Show Answer Correct Answer: B) It is cost effective in terms of energy lost. 3. Write the equation for magnetic field B at a point A) A. B) B. C) All the above. D) None of the above. Show Answer Correct Answer: B) B. 4. What is mutual induction? A) Induction in a single coil. B) Induction between two closely placed coils. C) Induction in a magnetic field only. D) Induction caused by a static charge. Show Answer Correct Answer: B) Induction between two closely placed coils. 5. You are involved in after-hours conference calls with the US for the third time this week. You have already made alternative arrangements. Do you: A) Give what you think is a cast-iron reason for not taking part. B) Try saying no but end up taking part. C) Complain that it's the third time this week and say a definite "NO". D) Say 'no' firmly and say when you will have to leave for your other appointment. Show Answer Correct Answer: D) Say 'no' firmly and say when you will have to leave for your other appointment. 6. Which of the following would increase the EMF supplied by a generator? A) Decreasing the area of the coil. B) Decreasing the time for one revolution. C) Decreasing the number of turns in the coil. D) Decreasing the strength of the magnetic field. Show Answer Correct Answer: B) Decreasing the time for one revolution. 7. The symbol and units of self-inductance are A) L (Henrys). B) C (Conductance). C) F (Flux). D) C (Farads). Show Answer Correct Answer: A) L (Henrys). 8. Assertion (A):Self-inductance is called the inertia of electricity. Reason (R):Self-inductance is the phenomenon, according to which an opposing induced e.m.f. is produced in a coil as a result of change in current or magnetic flux linked with the coil. A) Both A and R are true and R is the correct explanation of A. B) Both A and R are true but R is NOT the correct explanation of A. C) A is true but R is false. D) A is false and R is also false. Show Answer Correct Answer: A) Both A and R are true and R is the correct explanation of A. 9. Alternating current is produced in most power stations. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 10. Inductor stores energy in the form of A) Electromagnetic field. B) Electric field. C) Magnetic field. D) None of the above. Show Answer Correct Answer: C) Magnetic field. 11. Which object(s) have magnetic fields? A) Electric Charges. B) Magnets. C) Both Electric Charges & Magnets. D) Magnetic fields do not exist. Show Answer Correct Answer: C) Both Electric Charges & Magnets. 12. How is the direction of induced current determined in electromagnetic induction? A) By Lenz's Law. B) By Faraday's Law. C) By Newton's Law. D) By Ohm's Law. Show Answer Correct Answer: A) By Lenz's Law. 13. What is the material used for construction of transformer core? A) Aluminium. B) Copper. C) Iron. D) Wood. Show Answer Correct Answer: C) Iron. 14. What is the flow of electricity? A) Electric motor. B) Electric current. C) Electric eel. D) Electric circuit. Show Answer Correct Answer: B) Electric current. 15. The magnitude of induced current is directly proportional to the rate of ..... linked with the coil A) Magnetic field. B) Number of magnetic field lines. C) Change of magnetic field. D) Change of number of magnetic field lines. Show Answer Correct Answer: D) Change of number of magnetic field lines. 16. A uniform magnetic field its intensity is 3x10$^{-3}$ T pass anarea of coil with 100 turns which makes 60 angle with the coil. What is the area of the coil if the magnetic flux is 0.15 Wb? A) 0 m$^{2}$. B) 0.5 m$^{2}$. C) 0.57 m$^{2}$. D) 1 m$^{2}$. Show Answer Correct Answer: D) 1 m$^{2}$. 17. An A.C. generator converts kinetic energy to A) Electric energy. B) Potential energy. C) Light energy. D) Thermal energy. Show Answer Correct Answer: A) Electric energy. 18. Which of the following best describes EMF? A) Can be thought of as the difference between two electrical states in an electric field. B) The potential difference generated by one or more cells or a changing magnetic field. C) Depends on the magnitude and resistance of the current. D) Force that causes an electric charge to flow. Show Answer Correct Answer: B) The potential difference generated by one or more cells or a changing magnetic field. 19. According to Faraday's first law of electromagnetic induction, what is induced when a conductor is placed in a varying magnetic field? A) Power. B) Resistance. C) Current. D) Voltage. Show Answer Correct Answer: C) Current. 20. What is the principle behind electromagnetic induction? A) Faraday's Law. B) Newton's Law. C) Ohm's Law. D) Coulomb's Law. Show Answer Correct Answer: A) Faraday's Law. 21. An electron of charge, e, enters a magnetic field at right angles. Which of the following equations can be used to determine the momentum of this electron? A) B/re. B) Ber. C) RB/e. D) E/Br. Show Answer Correct Answer: B) Ber. 22. A device that converts mechanical energy into electrical energy using electromagnetic induction is called a: A) Transformer. B) Generator. C) Motor. D) Battery. Show Answer Correct Answer: B) Generator. 23. What is the significance of the negative sign in Lenz's Law? A) The negative sign is irrelevant to the behavior of magnetic fields. B) The negative sign indicates the direction of the magnetic field. C) The negative sign represents the strength of the induced current. D) The negative sign signifies the opposition of induced current to the change in magnetic flux. Show Answer Correct Answer: D) The negative sign signifies the opposition of induced current to the change in magnetic flux. 24. If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushedinto a coil with twice the number of loops, A) One-half as much voltage is induced. B) The same voltage is induced. C) Twice as much voltage is induced. D) Four times as much voltage is induced. Show Answer Correct Answer: C) Twice as much voltage is induced. 25. Wire loop is rotated in magnetic field. The frequency of change of direction of the induced emf is A) Once per revolution. B) Twice per revolution. C) Thrice per revolution. D) Four times per revolution. Show Answer Correct Answer: B) Twice per revolution. ← 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