This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 22 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 22 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. An electromagnetic induction setup can be made without using a galvanometer. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 2. Electromagnetic induction occurs in a coil when there is a change in A) Electric field in the coil. B) Magnetic field in the coil. C) Voltage in the coil. D) None of the above. Show Answer Correct Answer: B) Magnetic field in the coil. 3. What is the main method used for generating electricity? A) Electrostatic Induction. B) Electromagnetic Induction. C) Thermal Induction. D) Chemical Induction. Show Answer Correct Answer: B) Electromagnetic Induction. 4. A circular conducting loop is placed in a magnetic field perpendicular to the plane of the loop. As the magnetic field decreases at a rate of 0.040 T/s, an emf of 2.6 mV is induced in the loop. Find the radius of the loop. A) 0.02 m. B) 0.14 m. C) 4.5 m. D) 0.35 m. E) 2.1 m. Show Answer Correct Answer: B) 0.14 m. 5. In a transformer, if the primary coil has more turns than the secondary coil, what happens to the voltage? A) Increases. B) Decreases. C) Remains the same. D) Doubles. E) Triples. Show Answer Correct Answer: B) Decreases. 6. State Faraday's law of electromagnetic induction. A) The induced EMF is only present in closed circuits. B) The induced EMF is constant regardless of magnetic flux changes. C) The induced EMF is inversely proportional to the magnetic field strength. D) The induced EMF in a circuit is directly proportional to the rate of change of magnetic flux through the circuit. Show Answer Correct Answer: D) The induced EMF in a circuit is directly proportional to the rate of change of magnetic flux through the circuit. 7. A transformer has 48 turns on its primary coil. It has an input voltage of 88 V and output voltage of 264V. How many turn are on the secondary coil? A) 114. B) 144. C) 6. D) 484. Show Answer Correct Answer: B) 144. 8. A transformer with 240V AC input and 50V AC output, has 400 turns on its primary coil. Is it a step down or a step up transformer A) Step-up. B) Step-down. C) All the above. D) None of the above. Show Answer Correct Answer: B) Step-down. 9. When the voltage in the secondary coil decreases, it is called step-down transformer. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 10. A device such as dynamo used to generate alternating current? A) D.C generator. B) A.C generator. C) All the above. D) None of the above. Show Answer Correct Answer: B) A.C generator. 11. Unit for self induction A) Volt. B) Wb. C) T. D) Henry. Show Answer Correct Answer: D) Henry. 12. In Flemings Left hand rule what does the thumb point in the direction of? A) The direction of the magnetic field. B) The direction of the current. C) The direction of the force (movement). D) None of these. Show Answer Correct Answer: C) The direction of the force (movement). 13. Voltage is defined as ..... A) Measures the pushing force of electrons. B) Measures the flow of electrons. C) Measures the amount of electrons passing through the wire. D) Measures how much light is produced. Show Answer Correct Answer: A) Measures the pushing force of electrons. 14. Electromagnetic Induction IGCSE A) The change in electric current. B) The change in magnetic flux. C) The change in magnetic field direction. D) The change in electric field strength. Show Answer Correct Answer: B) The change in magnetic flux. 15. When the rate of change of current through a closed circuit is unity, then the induced e.m.f. produced in it is equal to A) Voltage. B) Coefficient of self induction or self inductance L. C) Electric field. D) Current. Show Answer Correct Answer: B) Coefficient of self induction or self inductance L. 16. An L-R circuit consists of an inductance of 8mH and a resistance of 42. The time constant of the circuit is A) 2ms. B) 12ms. C) 32ms. D) 500 s. Show Answer Correct Answer: A) 2ms. 17. Assertion (A):When two coils are wound on each other, the mutual induction between the coils is maximum. Reason (R):Mutual induction does not depend on the orientation of the coils. 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: C) A is true but R is false. 18. How is electromagnetic induction used in generators? A) By passing a current through a coil of wire. B) By using a permanent magnet to generate electricity. C) By rotating a coil of wire within a magnetic field. D) By heating a wire to create an electric current. Show Answer Correct Answer: C) By rotating a coil of wire within a magnetic field. 19. The pointer of a galvanometer needle whose terminals are connected to a solenoid coilwill be deflected if one withdraws the magnet quickly from the coil because ..... A) The number of the coil turns is very large. B) The coil intercepts the lines of the magnetic flux. C) The number of turns of the coil is suitable. D) The number of turns of the coil is small. Show Answer Correct Answer: B) The coil intercepts the lines of the magnetic flux. 20. An alternating current of frequency f is flowing through an ideal choke coil of self inductance L if V0 and I0 be the peak value of the voltage and the current. find the average power consumed by the choke coil A) One. B) Zero. C) Minus one. D) None. Show Answer Correct Answer: B) Zero. 21. A coil having self inductance of 0.7 and resistance of 165 ohm is connected to a AC source of 275 v 50 Hz calculate 1. Reactance of the coil 2. current flowing through the coil.3.Impendence of the coil A) .240ohm(2).285ohm(3).2A. B) .240ohm(2).275ohm(3).3A. C) .242ohm(2).285ohm(3).1A. D) .220ohm(2).275ohm(3).1A. Show Answer Correct Answer: D) .220ohm(2).275ohm(3).1A. 22. A 9 V battery is connected to three 30 $\Omega$ resistors in series. How much current (in amperes) flows through the battery? A) $0.1$. B) 0.1 Mathematical EquivalenceON. C) All the above. D) None of the above. Show Answer Correct Answer: A) $0.1$. 23. SI unit of Magnetic flux is A) Waber. B) Weber. C) Watt. D) Tesla. Show Answer Correct Answer: B) Weber. 24. What is the role of the magnetic field in electromagnetic induction? A) It opposes all electric currents. B) It generates heat. C) It induces current in a conductor. D) It has no role. Show Answer Correct Answer: C) It induces current in a conductor. 25. The SI unit of magnetic flux, causing the e.m.f. of one volt in a circuit of one turn when the flux is uniformly reduced to zero in one second. A) Tesla. B) Tesla turns. C) Weber turns. D) Weber. Show Answer Correct Answer: D) Weber. ← 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