fun with magnets 4

Observe the pictures A and B given in pictures carefully Which of the following statement is correct for the above given pictures?

• (a) In A, cars 1 and 2 will come closer and in B, cars 3 and 4 will come closer.

• (b) In A, cars 1 and 2 will move away from each other and in B, cars 3 and 4 will move away.

• (c) In A, cars 1 and 2 will move away and in B, 3 and 4 will come closer to each other.

• (d) In A, cars 1 and 2 will come closer to each other and in B, 3 and 4 will move away from each other.

North pole of a magnet can be identified by

• (a) Another magnet having its poles marked as North pole and South pole.

• (b) Another magnet no matter whether the poles are marked or not.

• (c) Using an iron bar.

• (d) Using iron filings.

A bar magnet is immersed in a heap of iron filings and pulled out. The amount of iron filling clinging to the

• (a) North pole is almost equal to the south pole.

• (b) North pole is much more than the south pole.

• (c) North pole is much less than the south pole.

• (d) Magnet will be same all along its length.

In which direction does a magnet always point when suspended freely?

• A) South-West

• B) North-South

• C) East-West

• D) West-South

Where does a compass work?

• A) Only in oceans or seas

• B) Only on land, where the earth's magnetic field is strong

• C) Only on high mountains

• D) At all the places within the earth's magnetic field

What is the special property of magnetic substances?

• A) They are repelled by magnets.

• B) They are attracted by magnets.

• C) They are both attracted and repelled by magnets.

• D) They cannot be made into magnets.

A How is a compass useful to us?

• A) In finding the altitude of a place

• B) In finding only the north of a place

• C) In finding all the directions of a place

• D) In making artificial magnets

Which of the following ways will NOT cause a magnet to lose its magnetism?

• A) Heating it strongly over a flame

• B) Dropping it on the floor repeatedly

• C) Coating it with a layer of oil

• D) Hitting it with a hammer repeatedly

Two magnets are placed close to each other as shown below. Which set will attract each other?

• 
• 
• 
• 

A credit card has a _______ kept across its poles.

• Compass

• Glass

• Magnet

• none of these