This quiz works best with JavaScript enabled. Home > Class 12 > Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction – Quiz 5 🏠 Homepage 📘 Download PDF Books 📕 Premium PDF Books Class 12 Physics (Part I) Chapter 6 Electromagnetic Induction Quiz 5 (25 MCQs) Quiz Instructions Select an option to see the correct answer instantly. 1. What is the unit for magnetic flux? A) Volt (V). B) Henry (H). C) Tesla (T). D) Weber (Wb). Show Answer Correct Answer: D) Weber (Wb). 2. Question 15 A) A. B) B. C) C. D) D. Show Answer Correct Answer: D) D. 3. A diamagnetic material in a magnetic field moves A) From weaker to the stronger parts of the field. B) Perpendicular to the field. C) From stronger to the weaker parts of the field. D) In none of the above directions. Show Answer Correct Answer: C) From stronger to the weaker parts of the field. 4. A square coil, enclosing an area with sides 5.0 cm long, is wrapped with 1500 turns of wire. A uniform magnetic field perpendicular to its plane is turned on and increases to 0.85 T during an interval of 3.0 s. What average voltage is induced in the coil? A) 0.25 V. B) 1.24 V. C) 0.97 V. D) 1.06 V. E) 0.55 V. Show Answer Correct Answer: D) 1.06 V. 5. A wheel with 10 metallic spokes each 0.5m long is rotated with a speed of 120 rev/min in a plane normal to the horizontal component (H) of Earth's magnetic field at a place. If H = 0.4 G at the place, what is the induced emf between the axle and the rim of the wheel> A) $62.8\times10^{-5}V$. B) $0.628\times10^{-5}V$. C) $6.28\times10^{-5}V$. D) $628\times10^{-5}V$. Show Answer Correct Answer: C) $6.28\times10^{-5}V$. 6. A transformer has 200 turns on its primary coil and is connected to a 240 V a.c. supply. The output voltage of the transformer is 60 V a.c ..... How many turns are on the secondary coil of the transformer? A) 20. B) 50. C) 72. D) 800. Show Answer Correct Answer: B) 50. 7. The working of speedometers of trains is based on A) Wattless currents. B) Eddy currents. C) Alternating currents. D) Pulsating currents. Show Answer Correct Answer: B) Eddy currents. 8. A moving electron enters a uniform and perpendicular magnetic field inside the magnetic field the electron travels along A) A straight line. B) Parabola. C) A circle. D) Hyperbola. Show Answer Correct Answer: C) A circle. 9. An e.m.f is produced in a coil, which is not connected to an external voltage source. This is not due to A) The coil being in a time varying magnetic field. B) The coil moving in a time varying magnetic field. C) The coil moving in a constant magnetic field. D) The coil is stationary in external spatially varying magnetic field, which does not change with time. Show Answer Correct Answer: D) The coil is stationary in external spatially varying magnetic field, which does not change with time. 10. What is created when a magnet moves through a coil of wire? A) An electromagnet. B) A ferromagnet. C) A solenoid. D) An electric current. Show Answer Correct Answer: D) An electric current. 11. How does a wind generator work? A) By using the power of wind to rotate blades connected to a generator, producing electricity. B) By using solar panels to convert sunlight into electricity. C) By using water flow to turn turbines and generate electricity. D) By using geothermal heat to produce steam and drive a generator. Show Answer Correct Answer: A) By using the power of wind to rotate blades connected to a generator, producing electricity. 12. When an electric current runs through a wire, a magnetic field is induced ..... A) Around the wire. B) Parallel to the wire. C) Under the wire. D) Through the wire. Show Answer Correct Answer: A) Around the wire. 13. What type of core is mentioned in the context of self inductance? A) Air cored. B) Iron cored. C) Copper cored. D) Plastic cored. Show Answer Correct Answer: A) Air cored. 14. Magnetic flux density has the units: A) Wb m$^{-2}$. B) Wb A$^{-1}$ m$^{-1}$. C) T m$^{-1}$. D) T m. Show Answer Correct Answer: A) Wb m$^{-2}$. 15. Lenz' Law is used to determine the ..... A) Magnitude. B) Direction. C) Charge. D) Power. Show Answer Correct Answer: B) Direction. 16. A transformer has a secondary coil with 500 windings and is supplied with 200 volts. The primary coil is supplied with 100 volts. How many windings are in the primary coil? A) 1000 windings. B) 250 windings. C) 500 windings. D) 750 windings. Show Answer Correct Answer: B) 250 windings. 17. Force on a conductor carrying a current = 1.32 N, current = 4 A, length = 3.88 m, magnetic flux density =? A) 0.0851. B) 1.17. C) 0.317. D) 0.106. Show Answer Correct Answer: A) 0.0851. 18. The direction of induced emf or current is indicated by: A) Fleming's left-hand rule. B) Fleming's right-hand rule. C) Faraday's law of electromagnetic induction. D) Ampere's swimming rule. Show Answer Correct Answer: B) Fleming's right-hand rule. 19. When a charged particle is projected perpendicular to a uniform magnetic field it describes a circular path in which A) Its kinetic energy remains constant. B) Its speed remains constant. C) Its velocity remains constant. D) Its kinetic energy remains constant. Show Answer Correct Answer: B) Its speed remains constant. 20. If you reverse the direction of movement of a magnet influencing a coil, what happens to the current? A) Reverses. B) Increases. C) Stays same. D) Decreases. Show Answer Correct Answer: A) Reverses. 21. Observe:Move the wire loop down, towards the magnet. Is the magnetic flux increasing or decreasing as you do this? A) Increasing. B) Decreasing. C) No change. D) Fluctuating. E) Constant. Show Answer Correct Answer: B) Decreasing. 22. DC stands for ..... current. A) Deviating. B) Default. C) Diverging. D) Direct. Show Answer Correct Answer: D) Direct. 23. A coil is moved perpendicular to a magnetic field. What is the effect on the induced EMF if the speed of movement is halved? A) The EMF is doubled. B) The EMF is halved. C) The EMF is quadrupled. D) The EMF remains the same. Show Answer Correct Answer: B) The EMF is halved. 24. The transformer is a device used to ..... the value of a voltage. A) Steady. B) Resist. C) Change. D) Anchor. Show Answer Correct Answer: C) Change. 25. When the current in a solenoid changes uniformly from-12.0 mA to 18.0 mA in 15.0 ms, a back-e.m.f. is induced in the solenoid. If the self-inductance of the solenoid is 3.97 H, what is the value of the back e.m.f.? A) 7.94 V. B) 8.50 V. C) 8.79 V. D) 10.2 V. Show Answer Correct Answer: A) 7.94 V. ← 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 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