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PHYSICS [1 Mark Question Answer]

Magnetism · ICSE STD 9 (ICSE - English Medium). 10 questions.

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[1 Mark Question Answer]

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10 questions · timed · auto-graded

Question 21 Mark
Name the material used for preparing an electromagnet.
Answer
The material used for preparing an electromagnet is soft iron.
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Question 31 Mark
What is an electromagnet?
Answer
An electromagnet is a temporary strong magnet made from a piece of soft iron when current flows in the coil wound around it. It is an artificial magnet.
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Question 41 Mark
Name the material used for making the armature of an electric bell. Give a reason for your answer.
Answer
The material used for making the armature of an electric bell is soft iron which can induce magnetism rapidly.
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Question 51 Mark
Explain the meaning of the term induced magnetism.
Answer
The magnetism acquired by a magnetic material when it is kept near (or in contact with) a magnet, is called induced magnetism.
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Question 61 Mark
You are provided with two similar bars, one is a magnet and the other is a soft iron. How will you distinguish between them without the use of any other magnet or bar?
[Hint : A magnet when suspended freely will rest only in the north-south direction, but the soft iron bar will rest in any direction]
Answer
A magnet when suspended freely will rest only in north-south direction, but the soft iron bar will rest in any direction.
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Question 71 Mark

How will you test whether a given rod is made of iron or copper?

[Hint : Iron rod gets magnetised when placed near a bar magnet by magnetic induction, while copper rod does not get magnetised]

Answer
Iron rod is magnetized when placed near a bar magnet by magnetic induction, while copper rod is not magnetized.
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Question 81 Mark
State whether the magnetic field lines in part (a) represent a uniform magnetic field or non-uniform magnetic field?
Answer
The magnetic field lines are non-uniform in nature.
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Question 91 Mark
Can two magnetic field lines intersect each other? Give reason to your answer.
Answer
No two magnetic field lines can intersect each other. If they do, there would be two directions of the field at that point which is not possible.
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Question 101 Mark
Induced magnetism is temporary'. Comment on this statement.
Answer
Induced magnetism is temporary as it lasts as long as the magnet causing induction remains in it vicinity.
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[1 Mark Question Answer] - PHYSICS STD 9 Questions - Vidyadip