I Directions: Read each statement. Choose the letter of the correct answer. 1. Which can be used as an iron core? A nail B. pen C. ruler D. stick 2. What makes up the electromagnet? A battery, switch, wire. B. battery, bulb, switch C. battery, wire, iron core D. battery, iron core, switch 3. Which of these group of materials will the electromagnet pick up? A button, seed, sand B. cotton, needle, thread C. thumbtack, paper clip, pin D. pencil, plastic can, bits of paper 4. Which is true about electromagnets? A. They are permanent. B. They don't need a battery. C. Increasing the battery makes it weaker. D. Increasing the number of coil makes it stronger. 5. What becomes of an electromagnet when it loses electricity? A. It changes its form. B. It continues to attract. C. It loses the magnetism. D. It increases its strength.​