This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 13 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 13 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the contribution of Joseph Henry to the world of electromagnetism? A) Discovered electrons. B) Discovered the electromagnetic phenomenon of self-inductance. C) Formulated Lenz's law. D) Concluded that lightning contains electricity. Show Answer Correct Answer: B) Discovered the electromagnetic phenomenon of self-inductance. 2. What is the principle behind AC generators? A) Mechanical friction. B) Chemical reaction. C) Thermal expansion. D) The principle behind AC generators is electromagnetic induction. Show Answer Correct Answer: D) The principle behind AC generators is electromagnetic induction. 3. What is the unit of self-inductance? A) Volt. B) Ohm. C) Ampere. D) Henry. Show Answer Correct Answer: D) Henry. 4. What factors affect the magnitude of induced EMF according to Faraday's Law? A) The rate of change of magnetic flux, the number of turns in the coil, and the area of the coil. B) The temperature of the coil. C) The strength of the electric field. D) The resistance of the circuit. Show Answer Correct Answer: A) The rate of change of magnetic flux, the number of turns in the coil, and the area of the coil. 5. Why transformers work with A.C. current but not D.C. A) C current produces changing magnetic field. B) C current produces changing magnetic field. C) C current is weak. D) C current is powerful. Show Answer Correct Answer: A) C current produces changing magnetic field. 6. A circular coil carrying a current of radius R and number of turns N and if all the three that is the current I, radius R and number of turns N are doubled, then magnetic field at its centre becomes A) Double. B) Half. C) 4 times. D) One fourth. Show Answer Correct Answer: A) Double. 7. A lamp rated at 12 V 60 W is connected to the secondary coil of a step-down transformer and is at full brightness. The primary coil is connected to a supply of 230 V. The transformer is 75% efficient.What is the current in the primary coil? A) 0.25 A. B) 0.35 A. C) 3.75 A. D) 5.0 A. Show Answer Correct Answer: B) 0.35 A. 8. Observe:Check that Show loop data is on. Move the wire loop up, away from the magnet. If so, in which direction is the current moving, left or right? A) Left. B) Right. C) Up. D) Down. Show Answer Correct Answer: A) Left. 9. The inductance in a coil plays the same role as A) Inertia in mechanics. B) Energy in mechanics. C) Momentum in mechanics. D) Force in mechanics. Show Answer Correct Answer: A) Inertia in mechanics. 10. The SI units of induced emf is A) Ohm. B) Volt. C) Henry. D) Tesla. Show Answer Correct Answer: B) Volt. 11. A student investigates the output voltage induced across a coil of wire by a bar magnet. When will the induced voltage have the greatest value? A) The student slowly moves the bar magnet into the coil of wire. B) The student leaves the bar magnet stationary in the coil of wire. C) The student quickly removes the bar magnet from the coil of wire. D) The student places the bar magnet at rest outside the coil of wire. Show Answer Correct Answer: C) The student quickly removes the bar magnet from the coil of wire. 12. What type of current is produced by a battery? A) Induced. B) Magnetic. C) Alternating. D) Direct. Show Answer Correct Answer: D) Direct. 13. A short bar magnet allowed to fall along the axis of horizontal metallic ring. Starting from rest, the distance fallen by the magnet in one second may be:- A) 4.0 m. B) 5.0 m. C) 6.0 m. D) 7.0 m. Show Answer Correct Answer: A) 4.0 m. 14. Factors that affect the voltage generation in Faraday's experiment is A) Number of Coils. B) Changing Magnetic Field. C) Changing environment. D) Option (a) and (b). Show Answer Correct Answer: D) Option (a) and (b). 15. For electromagnetism, what does the right hand rule explain? A) A charged particle moving through a magnetic field experiences a force. B) The direction of a magnetic field near a current-carrying wire. C) The direction of a magnetic field through a current-carrying coil. D) All of these. Show Answer Correct Answer: D) All of these. 16. What is the relationship between the rate of change of magnetic flux and induced EMF? A) The induced EMF decreases as the rate of change of magnetic flux increases. B) The induced EMF is independent of the rate of change of magnetic flux. C) The induced EMF is directly proportional to the rate of change of magnetic flux. D) The induced EMF is inversely proportional to the rate of change of magnetic flux. Show Answer Correct Answer: C) The induced EMF is directly proportional to the rate of change of magnetic flux. 17. What does EMF stand for? A) Electromagnetic Frequency. B) Electromagnetic Field. C) Electromotive Force. D) Electronic Music Foundation. Show Answer Correct Answer: C) Electromotive Force. 18. What is the primary purpose of an AC generator? A) To convert electrical energy into mechanical energy. B) To convert mechanical energy into electrical energy. C) To store electrical energy. D) To increase voltage. Show Answer Correct Answer: B) To convert mechanical energy into electrical energy. 19. There are 3 ways to increase the e.m.f, except? A) Use aluminium coil. B) Move the wire or coil more quickly relative to the magnet. C) Use a coil with more turn of wire. D) Use a stronger magnet. Show Answer Correct Answer: A) Use aluminium coil. 20. Name the law which gives information about the polarity of induced EMF A) Coulomb's law. B) Ampere law. C) Lenz law. D) Biot savart law. Show Answer Correct Answer: C) Lenz law. 21. If the direction of motion is reversed, the direction of the current ..... A) Reverses. B) Stays the same. C) All the above. D) None of the above. Show Answer Correct Answer: A) Reverses. 22. What is the result of cutting a magnet in half? A) The magnet ceases to function. B) The magnet is split into a north and a south pole. C) Each piece will have its own north and south poles. D) None of the above. Show Answer Correct Answer: C) Each piece will have its own north and south poles. 23. A 100% efficient transformer converts a 240 V input voltage to a 12 V output voltage. The output power of the transformer can be a maximum of 20 W.The output is connected to two 0.30 A bulbs in parallel. One of the bulbs fails. How does the current in the primary coil change? A) It decreases by 0.30 A. B) It decreases by 0.015 A. C) It increases by 0.15 A. D) It remains unchanged. Show Answer Correct Answer: B) It decreases by 0.015 A. 24. For a coil having L = 2mH, current flow through it is I = tet then the time at which emf becomes zero:- A) 2 sec. B) 1 sec. C) 4 sec. D) 3 sec. Show Answer Correct Answer: A) 2 sec. 25. An a.c. generator contains a coil that rotates at a rate of 4500 revolutions per minute. What is the frequency of the alternating current? A) 1.25 Hz. B) 75 Hz. C) 150 Hz. D) 4500 Hz. Show Answer Correct Answer: B) 75 Hz. ← 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