6. In your investigation you have a coil of wire around an iron nail, both ends of which are attracted to a battery. Which becomes the magnet?

A. Battery
B. Iron nail
C. copper wire
D. All of the letters

7. If there is a flow of electricity from the battery to the coil of wire around a nail , what happens to the nail?

A. The nail becomes wider.
B. The nail becomes magnet.
C. The nail turns to yellow color .
D. The nail becomes electric wire,

8. Which of the statement that tells the advantage of using parallel circuit
A. Other bulb still lights up even one bulb is taken or burned out.
B. Electricity flows through each electrical device. C. Consumes more electricity.
D. Needs only one switch.

9.The strength of electromagnet can be increased by
1. Using plastic can Increasing the size of the wire.
II. Increasing the size of wire
III. Increasing the number of turns of wire in a coil.
IV. Increasing the amount of electricity flowing through the wire.

A. III and IV
B. I and II
C. ll and III
D. I and I

10. Which of the following is an advantage of constructing electromagnet
A. Electromagnet is used for display.
B. Electromagnet is used for connection.
C. Electromagnet is used to connect the wire.
D. Electromagnet is used in electric motors which make electrical appliances work​