Direction; read each item carefully. encircle the letter of the correct answer.
1. what do you call the materials that allow electricity pass to through them easily?
a. conductors b. insulators c. metallics d. non - conductors
2. which of the following group of materials are good conductor of electricity
a. copper, silver, gold and zinc. b. iron, copper, silver, gold and nickel. c. wood, paper, leather cloth and plastic. d. gold, paper, leather cloth and plastic.
3. which of the following group of materials are insulators?
a. leather, book, paper, plastic b. silver, gold, nickel, iron. c. nylon cord, cotton cord wire . d. glass, zinc, copper, gold.
4. materials that do not transmit electricity and heat are called?
a. conductor b. insulator c. iron d. wire
5. what property material does an insulator has?
a. conductibility b. flexibility c. malleability d. resistivity
6. why is the wire used in an electromagnet coiled?
a. it has more force. b. it controls the field of attraction. c. it controls the flow of electricity. d. it makes the electromagnet stronger.
7. which of the following can make an electromagnet stronger?
a. by adding more dry cells b. by using core c. by increasing the number of turns in the coil of wire d. all of the above
8. which of the following devices makes use of electromagnets?
a. telephone b. electric bell c. electric buzzer d. all of the given responses
9. which of the the following is NOT part of an electromagnet?
a. the coiled wire b. the nail as the core c. the dry cell as the source of electricity d. the pins attracted by the electromagnet.
10. what happens when a part of an electromagnet is disconnected?
a. it loses its magnetism. b. electricity continues to flow through it. c. the electromagnet become a permanent magnet. d. there is an increase in the number of materials attracted.
11. the switches you see at home are electrical components that make the circuits of lights open or ___.
a. closed b. open c. parallel d. series
12. what refers to the complete path that allows free flow of electricity?
a. battery b. circuit c. electricity d. magnet
13. what makes a circuit open?
a. pushing the switch on b. pushing the switch off c. well positioned battery d. complete path of electricity
14. electricity flows from negative to the positive terminal of a battery in a ___.
a. closed circuit b. open circuit c. parallel d. series
15. electricity does not flow in an __ because there is a gap in the circuit.
a. closed circuit b. open circuit c. parallel d. series
16. which of the following is the source of electricity?
a. appliance b. dry cell c. light bulb d. switch
17. when the switch is " OFF" the electric circuit is ___.
a. open b. closed c. complete d. none of these
18. how do we close the electric circuit to turn on the light?
a. in b. off c. on d. out
19. an electric current flow in ___.
a. an open circuit b. a closed- circuit c. broken circuit d. incomplete circuit
20. which controls the flow of electric current in a circuit?
