Magnets

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.

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Three magnets A, B and C were dipped one by one in a heap of iron filing. Fig. 13.3 shows the amount of the iron filing sticking to them. The strength of these magnets will be

• A>B>C

• A<B<C

• A=B=C

• A<B>C

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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.

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What is a natural magnet known as?

• A) Toroid

• B) Lodestone

• C) Haematite

• D) Solenoid

Which of the following statements is true?

• A) The north pole of a magnet will attract the north pole of another magnet.

• B) Artificial magnets can be made from non-magnetic materials also.

• C) Lodestone is an artificial magnet.

• D) Isolated magnetic poles do not exist.

Where is the force of attraction of a magnet the maximum?

• A) At all sides

• B) All over the magnet

• C) At its poles

• D) At its centre

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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.