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Science [1 Marks Each] QUE - ANS

Exploring Magnets · Gujarat Board (GSEB) STD 6 (GSEB - English Medium). 39 questions.

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[1 Marks Each] QUE - ANS

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39 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
It was observed that a pencil sharpener gets attracted by 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.
Answer
The blade of a pencil sharpener is made of iron which is a magnetic , material. Due to this a pencil sharpener gets attracted towards the poles of a magnet.
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Question 21 Mark
Mention some important precautions to handle magnets.
Answer
$(1)$ Do not heat
$(2)$ Do not hammer
$(3)$ Do not drop
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Question 31 Mark
Why magnets should be kept away from mobiles, computer and compact disks $(CDs)$?
Answer
Televisions, mobiles, $CD$, computers and many more devices are made up of magnetic materials and magnets in it. If you bring a magnet closer to it then it will spoil these devices.
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Question 41 Mark
Why should we not beat or hammer a magnet?
Answer
By heating or hammering a magnet may loose its magnetic property. It is thus advised not to bear or hammer a magnet.
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Question 51 Mark
A bar magnet is cut into two pieces $A$ and $B$, from the middle, as shown in Fig.Image
Will the two pieces act as individual magnets? Mark the poles of these two pieces. Suggest an actimty to verify your answer.
Answer
Yes, by the test of repulsion.
Image
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Question 61 Mark
Boojho kept a magnet close to an ordinary iron bar. He observed that the Iron bar attracts a pin as shown in Fig.
Image
What inference could he draw from this observation? Explain.
Answer
The inference he could draw from this observation that the magnetic properties are induced into the iron bar and it acts like a magnet.
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Question 71 Mark
Three identical iron bars are kept on a table. Two out of three bars are magnets. In one of the magnet the North-South poles are marked. How will you find out which of the other two bars is a magnet? Identify the poles of this magnet.
Answer
The magnet with known poles will attract and repeat two ends of a magnet and attend both the ends of an ordinary bar. (Test for repulsion).
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Question 81 Mark
What do you mean by magnetic field?
Answer
The region around the magnet where its magnetic influence can be felt is called the magnetic field of the magnet.
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Question 91 Mark
When do two magnets attract each other?
Answer
Two magnets attract each other when their unlike (opposite) poles come close to each other.
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Question 111 Mark
Hang a bar magnet with a thread on a stand and rotate the base of stand. What will happen?
Answer
The direction of bar magnet is not changed as we rotate the stand. It is because a freely suspended magnet comes to rest in particular direction, i.e., north-south directions.
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Question 121 Mark
Why is compass needle kept in a closed glass vessel?
Answer
Compass needle is a small and thin magnet used to find the direction. If it is kept in open, it may deflect in any direction due to pressure exerted by air. So to know right direction, it is kept covered by glass covering.
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Question 131 Mark
How do the shipmen find the direction even when north pointing pole star is not visible?
Answer
Shipmen during navigation can find the “direction with the help of magnetic needle.
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Question 141 Mark
In which direction does freely suspended magnet rest?
Answer
A freely suspended magnet always points in the north-south direction.
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Question 151 Mark
What happens when a pole of a bar magnet say its north-pole is marked with a chalk and suspended freely? What do you observe on rotating the bar magnet?
Answer
The marked pole comes to rest in north direction. On rotating, after some time, it again comes to rest in north direction.
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Question 161 Mark
Can we isolate north-pole or south-pole?
Answer
No, we cannot isolate north- pole of a magnet from its south-pole or vice versa. If you break a bar magnet into two halves, you will not get a single north or south pole but two magnets each with its north and south-poles.
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Question 171 Mark
Which is the south-pole of a bar magnet?
Answer
It is the tip of a bar magnet that points towards the south direction.
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Question 181 Mark
Which is the north-pole of a bar magnet?
Answer
It is the tip of a bar magnet which points towards the north direction.
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Question 191 Mark
Are both poles of a magnet similar?
Answer
No, the two poles of a magnet are not similar (alike). Both have different tendency. The pole that points towards the north is called north-pole while the pole pointing always towards the south is called south-pole
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Question 201 Mark
To which part of the magnet do none or only a few iron filings (or pins) stick?
Answer
Minimum number of iron filings stick to the middle part of the magnet. Magnet has its magnetic effect least in this part (middle part).
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Question 211 Mark
To which part of the magnet do the most of the iron filings (or pins) stick?
Answer
Most of the iron filings (or pins) stick to the poles, i.e., north and south poles. At these poles of magnet, magnetic effect is maximum.
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Question 231 Mark
How will you test that ‘tea dust $3$ is not adulterated with iron powder?
Answer
We will test that ‘tea dust’ is not adulterated with iron powder by using magnet. If it has iron powder they will stick onto the magnet.
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Question 241 Mark
What are the properties of a magnet?
Answer
$(1).$ It attracts iron pieces towards itself.
$(2).$ It always aligns itself in the same direction, if left to rotate freely.
$(3).$ It is composed of oxides of iron $(Fe_3O_4).$
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Question 271 Mark
Write the names of some non magnetic substances.
Answer
Rubber, Cotton, Plastic, Wood, Button, Cloth, etc.
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Question 281 Mark
What are non magnetic substances?
Answer
Substances which are not attracted by magnet are called non¬magnetic substances.
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Question 291 Mark
What are magnetic materials (substances)?
Answer
Materials which get attracted by the magnet are called magnetic materials (substances).
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Question 301 Mark
Four identical iron bars were dipped in a heap of iron filings one by one. Fig. shows the amount of iron filings sticking to each of them.
Image
$(a)$ Which of the iron bar is likely to be the strongest magnet?
$(b)$ Which of the iron bars is not a magnet? Justify your answer.
Answer
$(a) A$
$(b) B$ because there are no iron filings sticking to it.
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Question 321 Mark
When does a magnet lose its magnetic property?
Answer
A magnet loses its property when heated, hammered or dropped from a height.
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Question 331 Mark
If a magnet is freely suspended, what alignment will it take?
Answer
A freely suspended magnet always aligns in North (N)-South(S) direction.
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Question 341 Mark
How many poles a bar magnet has? What are their names?
Answer
Each magnet has two magnetic polesNorth and South.
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Question 371 Mark
What is magnet?
Answer
The substances having the property of attracting iron, nickel or cobalt are called magnets.
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