3rd grade electricity and magnetism

Question 1

A ring magnet floats above another on a pencil. Why doesn't it fall down?

• A. The pencil is magnetic.
• B. The top magnet is very light air.
• C. The facing poles are the same, so they push apart.
• D. There is no gravity on a pencil.

Question 2

Why do many fridge and cupboard doors have a magnet in the seal or latch?

• A. to hold the door closed without a lock
• B. to make light
• C. to keep the food warm
• D. to make the door heavier

Question 3

A gold ring is placed in the gap in this circuit and the switch is closed. Will the bulb light?

• A. yes
• B. no

Question 4

The north pole of one magnet is brought near the north pole of another. Do they attract or repel?

• A. attract
• B. repel

Question 5

Is an aluminium (aluminum) drinks can attracted to a magnet?

• A. magnetic
• B. not magnetic

Question 6

Circuits: which statement is NOT true?

• A. A circuit must be complete for current to flow.
• B. An open switch stops the current.
• C. Batteries are safe to put in your mouth.
• D. Adding more cells makes a bulb brighter.

Question 7

True or false? A north pole and a south pole attract each other.

• A. True
• B. False

Question 8

Look at the circuit. Will the bulb light?

• A. yes
• B. no

Question 9

If you put a glass marble in the gap in a circuit, would it conduct electricity or insulate?

• A. conductor
• B. insulator

Question 10

Two magnets are tested. Magnet A holds 22 paperclips and magnet B holds 9. Which statement is right?

• A. Magnet A is stronger.
• B. Magnet B is stronger.
• C. Bigger magnets are always stronger.
• D. They are the same strength.

Question 11

True or false? Static electricity and magnetism are exactly the same thing.

• A. True
• B. False

Question 12

You hold two bar magnets so that the north pole of one faces the north pole of the other. What happens?

• A. attract (pull together)
• B. repel (push apart)

Question 13

A class held a magnet at different distances above a pile of paperclips and counted how many it picked up. How many paperclips did it pick up at 3 cm?

Answer 

Question 14

True or false? Magnets are used to sort steel from other metals in recycling.

• A. True
• B. False

Question 15

What pattern does this data show?

• A. The further away the magnet, the stronger its pull.
• B. Distance makes no difference to a magnet.
• C. Magnets only work when they are 3 cm away.
• D. The further away the magnet, the weaker its pull.

Question 16

How could you test which of two magnets is stronger?

• A. see which is heavier
• B. count how many paper clips each can hold in a chain
• C. see which is longer
• D. see which is shinier