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Science [3 Marks Each] QUE-ANS

Fun with Magnets · Gujarat Board (GSEB) STD 6 (GSEB - English Medium). 5 questions.

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[3 Marks Each] QUE-ANS

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5 questions · timed · auto-graded

Question 13 Marks
You are given an iron strip. How will you make it into a magnet?
Answer
$(1)$ Take a rectangular iron strip.  
$(1)$ Take a rectangular iron strip.
$(2)$ Take a bar magnet and keep it in contact with one of its poles with one edge of the iron strip.
$(3)$ Without lifting the bar magnet, move it along the length of the iron strip till you reach the other end.
$(4)$ Lift the magnet and bring the pole (the same pole you started with) to the same point of the iron strip from which you began.
$(5)$ Move the magnet again along the iron bar in the same direction as you did before. Repeat this process about $30—40$ times.
$(6)$ Bring few all pins near to the iron bar, it will behave as a magnet.
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Question 23 Marks
If a bar magnet and a piece of iron exactly similar to the bar magnet are given to you, then how will you determine, which one is bar magnet and which is a piece of iron?
Answer
Tie both the given pieces with a thread from exact centre and suspend them from individual wooden stands such that; they can rotate freely in the horizontal plane. Let both the pieces become steady after suspending them. The bar that comes to rest in North — South direction is a bar magnet and the other one is an iron slab. If you do not know North — South direction, repeat the experiment. The magnet will always come to rest in a fixed direction whereas the iron bar will always come to rest in any direction. For even more confirmed result take another bar magnet and bring its North pole near both the ends of the two bars turn by turn. One end of a bar will repel the magnet. This bar is a magnet and the other one is an iron bar.
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Question 33 Marks
State different types of magnets on the basis of their shapes.
Answer
The different types of magnets on the basis of their shapes are as follows:
$(1)$ Bar magnet having rectangular strip like shape
$(2)$ Horseshoe magnet
$(3)$ Needle- shaped magnet
$(4)$ Cylindrical magnet
$(5)$ Ball- ended magnet
$(6)$ Ring-shaped magnet.
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Question 43 Marks
Draw the figure of a magnetic compass and explain its construction and working.
Answer
Construction: A magnetic compass is a small cylindrical box made of either aluminium or brass. There is a circulor disc marked with directions. A magnetic needle is pivoted on a vertical axis in such a manner that it can rotate freely in the horizontal plane. The case is covered by a glass cover. Working: The magnetic compass is rotated in the horizontal plane in such a manner that the North pole of the needle comes on the letter N marked in the compass. Now, the directions shown by the compass are the true directions.
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Question 53 Marks
What precautions would you take to retain the magnetic properties of a magnet?
Answer
The following precautions should be taken to retain the magnetic properties of a magnet:
$(1)$ Do not let the magnet drop repeatedly.
$(2)$ Do not heat the magnet.
$(3)$ Do not put heavy weight on the magnet.
$(4)$ To keep them safe, bar magnets should be kept in pairs with their unlike poles on the same side.
$(5)$ Magnets must be separated by a piece of wood while two pieces of soft iron should be placed across their unlike poles. A soft iron strip should be kept near the two poles of the horseshoe magnet.

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[3 Marks Each] QUE-ANS - Science STD 6 Questions - Vidyadip