MAGNETISM OBJECTIVE QUESTIONS AND ANSWERS The more you practice, the better you become! Good luck! Please read the instruction below before you start. Each question on this section is followed by four options A to D, Find the correct option for each question. Click Next below to start. 1. Which of the following is not a magnetic material? A. Iron B. Nickel C. Cobalt D. Magnesium 2. Which of the following is an example of a ferromagnetic material? A. Silver B. Cobalt C. Plastic D. Mercury 3. A strong magnet can be demagnetized by A. placing it in the deep freezer overnight B. heating it to red-hot. C. putting it in a solenoid with a d.c. D. leaving it in water for a few days. 4. Which of the following is common to the electric fan. electric bell and the blender? A. Electromagnet B. Condenser C. Transformer D. Induction coil 5. Which of the following materials is magnetic? A. Brass B. Copper C. Glass D. Nickel 6. Keepers are used to store magnets in order to A. increase the strength of the magnet B. cancel the effect of the earth’s magnetism. C. reduce self-demagnetisation. D. protect the magnets when they fall. 7. Which of the statements below about the magnetic properties of iron and steel is correct? A. Both iron and steel are equally magnetized and demagnetized B. Iron is more easily magnetized and demagnetized than steel. C. Steel is more easily magnetized and demagnetized than iron. D. Iron is more easily magnetized than steel but steel is more easily demagnetized than iron. 8. The area between the like poles of two magnets where no lines of force appear is called A. magnetic field. B. neutral point. C. north pole. D. south pole. 9. Which of the following materials is magnetic? A. Brass B. Copper C. Glass D. Nickel 10. A strong magnet can be demagnetized by A. heating it to red-hot. B. putting it in a solenoid with a d.c. C. leaving it in water for a few days. D. placing it in a deep freezer overnight. 11. A soft magnet is the type which A. maintains its magnetism permanently. B. can be demagnetized with ease. C. can easily be cut into smaller pieces. D. attracts other magnetic materials. 12. The reason for using keepers to store magnets is to A. increase the strength of the magnet. B. cancel the effect of the earth’s magnetism. C. protect the magnets when they fall. D. reduce self-demagnetization. 13. Which of the following methods could be used to demagnetize a strong magnet? A. Leaving it in water for few days. B. Heating it to red-hot. C. Placing it in a deep freezer overnight. D. Putting it in a solenoid with a direct current. 14. The strength of an electromagnet can be increased by I. increasing the current flowing through it.II. using a coil with more turns of wire.III. putting a soft iron core through the centre of the coil.IV. using keepers. A. I and III only B. Ill and IV only C. I, II and III only D. II, III and IV only 15. Magnets are found in I. electric generator.II. loudspeaker.III. microphone. A. I and II only B. B. I and III only C. II and III only I, II and III 1 out of 2 16. Which of the following methods is/are used in making magnets? I. Single touchII. Double touchIII. Electrical A. I only B. I and m only C. II and III only D. I, II and III 17. Which of the following methods can be used to produce magnets? I. Direct currentII. Alternating currentIII. Stroking A. I only B. II only C. I and III only D. I, II and III 18. When a soft iron is attracted to a strong magnet, it becomes A. a permanent magnet. B. a temporary magnet. C. an electromagnet. D. a transistor. 19. One way of making magnetic field stronger in a solenoid is to A. increase the number of turns of wire. B. decrease the current in the solenoid. C. ensure that the field lines are far apart. D. change the direction of magnetic field lines 20. A bar magnet was moved towards a metal and the metal was attracted. It can be concluded that the metal is I. a magnet.II. not a magnetIII. a magnetic material. A. I only B. II only C. Ill only D. I and III only 2 out of 2 Time is Up! Time's up
