Worksheet: Fun With Magnets

Q.1. Fill in The Blanks
(i) An object that attracts materials like iron, nickel and cobalt is called a ______.
(ii) A magnet has two poles ______ Pole and ______ Pole.
(iii) Magnetite is a ______ magnet.
(iv) A ______ can be used to find directions.
(v) ______ magnets retain their properties only for a short period of time.

Q.2. True/False
(i) A cylindrical magnet has only one pole.
(ii) The force of attraction of magnet is maximum at the poles and minimum at the centre.
(iii) Plastic is a magnetic material.
(iv) The earth behaves like a giant magnet.
(v) We can make magnet with single pole.

Q.3. Who Discovered Magnets?

Q.4. Where are poles of a bar magnet located?

Q.5. Where on a magnet is the magnetic force the maximum?

Q.6. How a mixture of iron filings and sand is separated?

Q.7. At which part of a magnet is its magnetic force minimum?

Q.8. In which direction a freely suspended magnet come to rest?

Q.9. What happens when we bring a magnetic compass near a closed electric circuit?

Q.10. If magnet is not attracting the iron nails. What could be the reason behind this?

Q.11. What happens when a south pole of a magnet is brought near the south pole of another magnet?

Q.12. How can a magnet be demagnetized?

Q.13. How can you tell whether a particular substance is magnetic or non-magnetic?

Q.14. Why should we not keep magnets near mobiles, television, computers and CDs?

Q.15. Why a magnet is called a "magnetic dipole"?

Q.16. What are electromagnets?

Q.17. If a bar magnet broke into pieces, then where will its North and South Pole?

Q.18. How does a magnetic compass work?

Assertion and Reason Questions

Q19. Assertion (A): A simple magnetic compass can be prepared by inserting a magnetised iron needle in a piece of cork and allow the cork to float in water kept in a bowl.
Reason (R): In the above arrangement the needle must touch water while floating.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Q20. Assertion (A): Maglev is the train which does not require wheels.
Reason (R): Maglev train experiences very less friction.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Q21. Assertion (A): Strength of electromagnet depends on the magnitude of current flowing through them.
Reason (R): Electromagnets are used to lift heavy weights.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Q22. Assertion (A): A compass is a magnetic device that is used by sailors to find directions.
Reason (R): The sailor can find directions by use of dial of magnetic compass even if there is no magnetic needle fixed in the compass.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

Q23. Assertion (A): The north pole of a freely suspended magnet points towards geographic north.
Reason (R): Using pieces of iron we can make artificial magnets.
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true but R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is false but R is true.

You can access the solutions to this worksheet here.