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Energy and Electromagnetism

Authored by Charles Martinez

Science

8th Grade

NGSS covered

Energy and Electromagnetism
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33 questions

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1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Why might an electromagnet be used to pick up old cars in junk yards?

Electromagnets are powerful and can be turned on and off easily.

Electromagnets are versatile and can pick up any metallic objects in the yard.

Electromagnets are easy to operate and can be run by cheap labor.

Electromagnets are inexpensive and easily create revenue.

Tags

NGSS.MS-PS2-5

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In an electric motor, an electric current causes the coil to rotate, changing

mechanical energy to potential energy

mechanical energy to electrical energy

electrical energy to mechanical energy

electrical energy to potential energy

Tags

NGSS.MS-PS3-5

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

An electromagnet used in a junk yard can only pick up small cars. How could the electromagnet be improved so that it can lift trucks and other large vehicles?

The electric current could be increased and the number of coils in the solenoid could be decreased.

The electric current and the number of coils in the solenoid could be increased

The electric current could be decreased and the number of coils in the solenoid could be increased

The electric current and the number of coils in the solenoid could be decreased.

Tags

NGSS.MS-PS2-5

NGSS.MS-ETS1-1

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Media Image

The balloon shown above rearranges the charges in the wall without actually touching the wall. This is an example of

conduction

induction

friction

convection

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How does a material become positively charged?

by gaining protons

by gaining electrons

by losing electrons

by losing protons

Tags

NGSS.MS-PS2-3

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which method of charging occurs when electrons move from one object to another by direct contact (when touching)?

friction

conduction

induction

indirectly

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Mrs. Smith's class decides to try an experiment. She rubs a blown up balloon on Sandy's head. After this, she takes the balloon and places it on the side of the wall, where it sticks, instead of falling to the ground. Also, Sandy's hair is now sticking almost straight out.


What is the reason the balloon is now sticking to the wall?

The balloon has a static electric charge from rubbing Sandy's hair.

The wall has been electrically charged and so attracts the balloon.

The balloon lost its static electric charge by rubbing Sandy's hair.

The balloon would have stuck to the wall whether or not it was rubbed on Sandy's hair.

Tags

NGSS.MS-PS2-5

NGSS.MS-PS2-3

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