Magnetic Field

Q. It is advised to keep the magnets away from television, mobiles, CD and computers. Explain why?

Q. Can we isolate the north pole or south pole of a magnet?

Q. It is advised to keep the magnets away from television, mobiles, CD and computers. Explain why?

Q. Consider the following statements and choose the correct option.
1. Magnetic field lines form closed loops.
2. No two field lines intersect.

1. Both 1 and 2 are true
2. Both 1 and 2 are false
3. Only 1 is true
4. Only 2 is true

Q. Which of the following actions will not make a magnet lose its magnetic properties?
1. Dropping a magnet from a height
2. Hammering a magnet
3. Passing electric current through a magnet
4. Heating a magnet

1. Only 3
2. 1 and 2
3. 3 and 4
4. Only 4

Q. Soft iron pieces are placed across the ends of a bar magnet while being stored. What are such pieces called?

1. Preservatives
2. Keepers
3. Compasses
4. Poles

Q. Can we isolate the north pole or south pole of a magnet?

Q. Soft iron pieces are placed across the ends of a bar magnet while being stored. What are such pieces called?

1. Preservatives
2. Keepers
3. Compasses
4. Poles

Q. Magnetic field lines have which of the following properties?

1. Magnitude
2. Colour
3. Direction
4. All of these

Q. What is the reason to pivot the compass needle on a sharp pin?

1. To minimise the magnetic effect on the pin
2. To maximize the magnetic effect on the pin
3. To minimise the friction between the pin and the compass needle
4. To ensure that the compass needle will not drop from the pivoted point

Q. We should pivot the compass needle on a sharp pin to _______.

1. minimise the magnetic effect on the pin
2. maximise the friction between the pin and the compass needle
3. minimise the friction between the pin and the compass needle
4. ensure it doesn't get affected by other magnets

Q.

Which of the following situations involves a non-contact force?

1. Opening a drawer.

2. Kicking a ball.

3. Magnet pulling iron piece.

4. Closing a door.

Q.

What is attractive property of a magnet?

Q. Can we isolate the north pole or south pole of a magnet?