Magnet

When Magnet A is brought close to Magnet B, the two of them repel each other. What is a possible reason for this?

I can check whether an electromagnet is working by checking if it can repel insulators. (True/False)

A magnet can be demagnetized by heating it over an open flame. (True/False)

A magnet can be demagnetized by dropping it on the floor repeatedly. (True/False)

Magnets are useful to keep the door of a refrigerator shut. (True/False)

A bar magnet can attract all kinds of metal. (True/False)

Magnetism can pass through non-magnetic materials. (True/False)

Keith had four nails of the same size but made of different materials (Plastic/Copper/Steel/Silver). She stroked each nail thrity times in the same direction with the same magnet. Which nail would attract some iron pins?

The magnetic force becomes stronger when it attracts more iron nails. (True/False)

Magnets are useful to keep the room doors closed. (True/False)

Magnets are useful to stick our memo onto a magnetic notice board. (True/False)

Magnetic force can only act at its poles. (True/False)

I can check whether an electromagnet is working by checking to see whether it conducts heat easily. (True/False)

If a freely-suspended magnet is allowed to come to rest, it will always point in a _________ direction.

A magnet can be demagnetized by placing it under the sun for an hour. (True/False)

A magnet can be demagnetized by soaking it in water for few hours. (True/False)

Magnets are useful to separate broken wooden toothpicks from the good ones. (True/False)

I can check whether an electromagnet is working by putting some paperclips near it. (True/False)