This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 9 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 9 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is magnetic flux? A) The amount of electric charge passing through a surface per unit time. B) The product of the magnetic field strength and the area perpendicular to the field through which the field lines pass. C) The force experienced by a charged particle in a magnetic field. D) The total number of magnetic field lines passing through a given area. Show Answer Correct Answer: B) The product of the magnetic field strength and the area perpendicular to the field through which the field lines pass. 2. What role does a transformer play in mutual induction? A) A transformer facilitates mutual induction by transferring energy between its primary and secondary windings through a changing magnetic field. B) A transformer converts sound waves into electrical signals. C) A transformer only works with direct current (DC). D) A transformer generates electricity without any magnetic field. Show Answer Correct Answer: A) A transformer facilitates mutual induction by transferring energy between its primary and secondary windings through a changing magnetic field. 3. A transformer consists of A) Metal Core. B) Metal core and coiled wire. C) Metal core and polymer wire. D) Polymer core and metal wire. Show Answer Correct Answer: B) Metal core and coiled wire. 4. An inductor is a circuit element that can store energy in A) Magnetic field. B) Electric flux. C) Electric field. D) None. Show Answer Correct Answer: A) Magnetic field. 5. When an electromagnet's circuit is broken, it loses its magnetic properties. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 6. What is the effect of increasing 'L' in the self induction formula? A) Increases induced voltage. B) Decreases induced voltage. C) No effect on induced voltage. D) Changes current direction. Show Answer Correct Answer: A) Increases induced voltage. 7. Surrounding every moving electron is A) A magnetic field. B) An electric field. C) Both of these. D) None of these. Show Answer Correct Answer: C) Both of these. 8. All of the following will have an induced emf EXCEPT A) A loop of wire moves into a magnetic field. B) A loop of wire moves out of a magnetic field. C) A loop of wire rotates about its diameter in a magnetic field. D) A loop of wire moves from one end of a magnetic field to the other. Show Answer Correct Answer: D) A loop of wire moves from one end of a magnetic field to the other. 9. Explain the concept of back EMF in motors and its implications. A) Back EMF only occurs in stationary motors. B) Back EMF in motors is the voltage generated in the opposite direction to the applied voltage when the motor is running. It helps limit the current drawn by the motor and protects it from damage. C) Back EMF is the voltage generated in the same direction as the applied voltage in motors. D) Back EMF has no impact on the current drawn by the motor. Show Answer Correct Answer: B) Back EMF in motors is the voltage generated in the opposite direction to the applied voltage when the motor is running. It helps limit the current drawn by the motor and protects it from damage. 10. Generators are used in power plants to convert other forms of energy into electrical energy. A) True. B) False. C) All the above. D) None of the above. Show Answer Correct Answer: A) True. 11. As the current decreases in the coil from 20 A to 10 A for 0.1 s, a self-induction of 200 V. occurs in it. What magnetic flux penetrates the coil at the instant when 15 A current flows through it? A) 450 Wb. B) 30 Wb. C) 45 Wb. D) 20 Wb. Show Answer Correct Answer: B) 30 Wb. 12. Which one of the following statements is correct?An electron follows a circular path when it is moving at right angles to A) A uniform magnetic field. B) A uniform electric field. C) Uniform electric and magnetic fields which are perpendicular. D) Uniform electric and magnetic fields which are in opposite directions. Show Answer Correct Answer: A) A uniform magnetic field. 13. Two capacitors are connected such that the voltage across each are the same. If the voltage is 5V and the capacitance of each is 1 microfarad, what is the total energy stored on the capacitors? A) 5 microjoules. B) 10 microjoules. C) 12.5 microjoules. D) 25 microjoules. Show Answer Correct Answer: D) 25 microjoules. 14. Electro motive force induced by motion of conductor across magnetic field is called A) EMF. B) Motional EMF. C) Rotational EMF. D) Static EMF. Show Answer Correct Answer: B) Motional EMF. 15. What is the direction of the induced voltage according to Lenz's law? A) Is perpendicular to the flux. B) Enhances the flux causing it. C) Opposes the flux causing it. D) Is independent of the flux. Show Answer Correct Answer: C) Opposes the flux causing it. 16. What is an AC Generator? A) A machine that's converts mechanical energy into alternating current electrical energy. B) A machine that's converts mechanical energy into direct current electrical energy. C) A machine that's converts electrical energy into mechanical energy. D) None of the above. Show Answer Correct Answer: A) A machine that's converts mechanical energy into alternating current electrical energy. 17. You're going camping, and you need a source of electric current. So, you buy a gasoline-powered: A) Motor. B) Generator. C) Inducer. D) Electromagnet. Show Answer Correct Answer: B) Generator. 18. A(n) ..... converts electricity into magnetism, and back to electricity. A) Electric transformer. B) Electric generator. C) Electromagnet. D) Electric motor. Show Answer Correct Answer: A) Electric transformer. 19. What is the unit of magnetic flux? A) Joule (J). B) Newton (N). C) Tesla (T). D) Weber (Wb). Show Answer Correct Answer: D) Weber (Wb). 20. Question 16 A) A. B) B. C) C. D) D. Show Answer Correct Answer: D) D. 21. A coil of metal wire is kept stationary in a non-uniform magnetic field: A) An e.m.f. and current both are induced in the coil. B) An e.m.f. but not the current is induced iii the coil. C) Current but not the e.m.f is induced in the coil. D) Neither e.m.f. nor current is induced in the coil. Show Answer Correct Answer: D) Neither e.m.f. nor current is induced in the coil. 22. List one application of electromagnetic induction in everyday life. A) Electric generators. B) Batteries. C) Electric heaters. D) Solar panels. Show Answer Correct Answer: A) Electric generators. 23. In the Fleming's Right Hand Rule, the index finger stands for the ..... A) Field. B) Current. C) Motion. D) Voltage. Show Answer Correct Answer: A) Field. 24. In electromagnetic induction, what is being created? A) Magnetism. B) Electrical energy. C) Mechanical energy. D) Chemical energy. Show Answer Correct Answer: B) Electrical energy. 25. A metal rod is moved through a magnetic field. What is produced in the rod? A) A magnetic field. B) An electric current. C) Both a magnetic field and an electric current. D) None of the above. Show Answer Correct Answer: B) An electric current. ← 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 10Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books