Q1. Fill in the blanks in the following:
(i) Artificial magnets are made in different shapes such as ______, ______ and ______.
(ii) The Materials which are attracted towards a magnet are called ______.
(iii) Paper is not a ______ material.
(iv) In the olden days, sailors used to find direction by suspending a piece of ______.
(v) A magnet always has ______ poles.
Ans:
(i) Artificial magnets are made in different shapes such as bar-magnet, cylindrical magnets and horseshoe magnets.
Cylindrical magnet(ii) The Materials which are attracted towards a magnet are called magnetic materials.
(iii) Paper is not a magnetic material.
(iv) In the olden days, sailors used to find direction by suspending a piece of bar magnet.
(v) A magnet always has two poles.Magnet having two poles (North & South)Q2. State whether the following statements are true or false.
Q3. It was observed that a pencil sharpener gets attracted by both the poles of a magnet although its body is made of plastic. Name a material that might have been used to make some part of it.
Ans: The pencil sharpener is attracted to both poles of a magnet, despite being made of plastic. This attraction occurs because:
Q4. Column I shows different positions in which one pole of a magnet is placed near that of the other. Column II indicates the resulting action between them for each situation. Fill in the blanks.
Ans:
Q5. Write any two properties of a magnet.
Ans: Two properties of a magnet are as follows:
(i) Like magnetic poles repel each other and unlike magnetic poles attract each other.
(ii) A freely suspended magnet always aligns in N-S direction.
Q6. Where are poles of a bar magnet located?
Ans: The poles of bar magnet are located at its two end points.Two Poles
Q7. A bar magnet has no markings to indicate its poles. How would you find out near which end is its north pole located?
Ans: To find the north pole of a bar magnet without markings, you can follow these steps:
Q8. You are given an iron strip. How will you make it into a magnet?
Ans: An iron strip can be turned into a magnet by following these steps:
Continue this process for at least 30-40 times. After this, the iron strip will become a bar magnet with two poles. To check if it has magnetised, bring a pin or some iron filings close to the strip. If it does not attract them, repeat the process until it does.
Q9. How is a compass used to find directions?
Ans: A compass consists of a magnetic needle that can move freely.
This simple tool has been used for centuries to help travellers find their way.
A Compass
Q10. A magnet was brought from different directions towards a toy boat that has been floating on water in a tub. The effect observed in each case is stated in Column I. Possible reasons for the observed effects are mentioned in Column II. Match the statements given in Column I with those in Column II.
Ans:
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