This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 3 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 3 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. The source of all magnetism is A) Tiny pieces of iron. B) Tiny domains of aligned atoms. C) Moving electric charge. D) None of the above. Show Answer Correct Answer: B) Tiny domains of aligned atoms. 2. The direction of the induced field can be predicted by ..... A) Kepler's law. B) Newton's law. C) Lenz's law. D) Faraday's law. Show Answer Correct Answer: C) Lenz's law. 3. Which of the following is the correct unit for permeability of free space? A) Tesla. B) Tesla metre Ampere. C) Tesla metre per Ampere. D) Tesla per metre per Ampere. Show Answer Correct Answer: C) Tesla metre per Ampere. 4. What happen to the magnetic flux if the magnetic field intensity increases? A) The magnetic flux decreases. B) The magnetic flux increases. C) The magnetic flux remains constant. D) The magnetic flux becomes zero. Show Answer Correct Answer: B) The magnetic flux increases. 5. Voltage can be induced in a wire by A) Moving the wire near a magnet. B) Moving a magnet near the wire. C) Changing the current in a nearby wire. D) All of these. E) None of these. Show Answer Correct Answer: D) All of these. 6. There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then A) Current is induced in the loop in the anti-clockwise direction. B) Current is induced in the loop in the clockwise direction. C) Ac is induced in the loop. D) No current is induced in the loop. Show Answer Correct Answer: A) Current is induced in the loop in the anti-clockwise direction. 7. What does a step-down transformer do? A) Decreases voltage and increases current. B) Increases voltage and decreases current. C) Keeps the voltage and the current the same. D) None of the above. Show Answer Correct Answer: A) Decreases voltage and increases current. 8. A solenoid L and resistance R are connected in series to a battery through a switch when the switch is put on the current I is flowing through it varies with time as shown in the figure that is graph is given below A) A. B) B. C) C. D) D. Show Answer Correct Answer: B) B. 9. Induction that occurs to the same conductor in which current changes is called ..... A) Mutual induction. B) Multiple induction. C) Selfish induction. D) Self induction. Show Answer Correct Answer: D) Self induction. 10. Electricity can be generated by rotating a wire loop between the poles of a magnet. Which of the following arrangements will induce the largest current in the loop? A) The induced current is the same in all positions of the loop. B) The plane of the loop is parallel to the magnetic field. C) The plane of the loop is perpendicular to the magnetic field. D) The plane of the loop makes an angle of 45$^\circ$ with the magnetic field. Show Answer Correct Answer: B) The plane of the loop is parallel to the magnetic field. 11. Like poles on a magnet? A) Attract. B) Repel. C) None of the above. D) Both a & b. Show Answer Correct Answer: B) Repel. 12. Experiment:Click Reverse and observe the electric field as the magnet moves away. How does changing the direction of the magnet affect the electric field? A) It reverses the direction of the electric field. B) It increases the strength of the electric field. C) It decreases the strength of the electric field. D) It has no effect on the electric field. Show Answer Correct Answer: A) It reverses the direction of the electric field. 13. Straight body posture shows what? A) Pride. B) Professionalism. C) Confidence. D) Humility. Show Answer Correct Answer: C) Confidence. 14. What do you need to build a working electric motor? A) An extremely large magnet. B) Fuel that can be burned. C) A wire that's at least 5 meters long. D) A source of electricity. Show Answer Correct Answer: D) A source of electricity. 15. Magnetic Field lines around a bar magnet: A) Are perpandicular the the magnet. B) Spread out from north pole and curve to south. C) Cross back and forth over eachother. D) Are perfectly straight. Show Answer Correct Answer: B) Spread out from north pole and curve to south. 16. A ..... is an electrical device that converts AC electricity from one voltage level to another A) Transformer. B) Primary coil. C) Secondary coil. D) Center tap. Show Answer Correct Answer: A) Transformer. 17. What cause-and-effect statement best describes what happens in a motor? A) A changing magnetic field causes current to be produced in a wire. B) A current carrying wire causes a magnetic field to be produced around the wire. C) All the above. D) None of the above. Show Answer Correct Answer: B) A current carrying wire causes a magnetic field to be produced around the wire. 18. Faraday's Law uses which of the following to determine the EMF? A) Number of turns in a coil and the rate of change in the magnetic field. B) The voltage of the bulb and coulomb's constant. (k). C) The magnetic field and the oven door. D) The rotation of the coil and Lenz' postulate. Show Answer Correct Answer: A) Number of turns in a coil and the rate of change in the magnetic field. 19. What is the potential difference between the live and neutral wires in a domestic circuit in India? A) 440 V. B) 220 V. C) 660 V. D) 110 V. Show Answer Correct Answer: B) 220 V. 20. A step up transformer ..... A) Decreases voltage. B) Decreases current. C) Increases power. D) Increases frequency. Show Answer Correct Answer: B) Decreases current. 21. In physics, to "induce" something is to: A) Make it more powerful. B) Create it. C) Turn it into something else. D) Reverse its direction. Show Answer Correct Answer: B) Create it. 22. What does the formula for self induction express? A) Voltage induced in a coil. B) Resistance in a circuit. C) Capacitance in a capacitor. D) Power in a resistor. Show Answer Correct Answer: A) Voltage induced in a coil. 23. Compare and contrast AC and DC generators in terms of electromagnetic induction. A) AC generators use stationary magnetic field, DC generators use slip rings. B) AC generators use rotating magnetic field, DC generators use commutator. C) AC generators use brushes, DC generators use stationary magnetic field. D) AC generators use commutator, DC generators use rotating magnetic field. Show Answer Correct Answer: B) AC generators use rotating magnetic field, DC generators use commutator. 24. What is AC stands for in AC Generator A) Alternate Click. B) Alternating Current. C) Advance Current. D) Advance Circle. Show Answer Correct Answer: B) Alternating Current. 25. Which material is most suitable for the core of a transformer? A) Air. B) Plastic. C) Iron. D) Cardboard. Show Answer Correct Answer: C) Iron. ← 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 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 10Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 11 🏠 Back to Homepage 📘 Download PDF Books 📕 Premium PDF Books