Science 5 Q3

Why is the wire used in an electromagnet coiled?

• It has more force    

• It controls the field of attraction

• It controls the flow of electricity

• It makes the electromagnet stronger. 

How can you increase the strength of an electromagnet?

• by letting the electricity pass through it

• by adding more dry cells or batteries

• by adding more magnets

• by adding longer wires

Which object is NOT used in making an electromagnet?

• battery

• thumbtacks

• nail

• wire

What is the basic unit for measuring distance?

• A. hour

• B. kilometer

• C. millimeter

• D. second

Zoey made an electromagnet, but it is very weak. How can she make it stronger?

• take away the battery

• use thicker wire

• wrap the wire loosely

• use less turns

One of two points in a magnet where its magnetism is strongest called ________________.

• Magnetic field

• magnetism

• electromagnet

• magnetic poles

This is a temporary magnet that may be produced by making electricity flow through a wire coiled around an iron nail.

• electromagnet

• magnetism

• electricity

• dry cells

What will happen if you add too many batteries more than the bulb requires in a simple circuit?

• The bulb will burn out.

• The bulb will not light.

• The bulb will glow dimmer.

• The bulb will glow brighter.

Which of the objects below can be pulled by magnets?

• Coins, nails

• needles, paper clips

• spoons, safety pins

• all of the above

What will happen if there were no wire in a circuit?

• The battery will produce more energy.

• The battery will lose energy.

• The bulb will light.

• The bulb will not light up.