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Directions: Choose the best answer. 1. Which statement is true? A. All electromagnets are permanent magnets. B. Increasing the number of coils in an electromagnet decreases it strength. C. Increasing the batteries increases its strength. D. Both A and B. 2. Which can increase the strength of an electromagnet? A. increasing the number of coils around the nail B. increasing the number of batteries C. making the core bigger D. all of the above 3. Which of the electromagnets would have the greatest magnetic field? A.B.C.D. 4. Which of the following is NOT part of an electromagnet? A. wire B. core C. battery D. needles 5. A magnet that works only when there is a flow of electricity. A. Electromagnet B. Bar Magnet C. Horse Shoe Magnet D. Magnetite 6. Which appliance does NOT use electromagnet? A. telephone B. television C. radio D. broom 7. Which is NOT made of electromagnet? A. cooking pan B. transformer C. generator D. motor 8. Which of these forces can be used in a motor? A. magnetism B. wind C. friction D. gravity 9. Electromagnets are A. permanent B. instant C. temporary D. stable 10. Which makes an electromagnet work? A. needle B. electricity C. pin D. thumbtack 11. Which is an example of a temporary magnet? A. bar magnet B. horseshoe magnet C. electromagnet D. magnetite 12. Which can increase the strength of an electromagnet? A. increase the number of batteries B. increase the number of coils C. change core into a bigger one pasagot naman yon Tama sana thank you
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