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6th Grade > Physics

FUN WITH MAGNETS MCQs

Total Questions : 99 | Page 4 of 10 pages
Question 31. If a bar magnet is cut lengthwise into two parts, how many numbers of poles will be formed? [1 MARK]
 Discuss Question

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Each magnet has a tiny north and south pole. If you cut one in half, the newly cut faces will become the new north or south poles of the smaller pieces. Hence, the total number of poles will be four.
Question 32. What is the difference between magnetic and non-magnetic materials? Give examples. [3 MARKS]
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Difference: 2 Marks
Examples: 1 Mark
The materialswhich areattracted towards a magnetare known as magnetic materials. For example- iron, cobalt etc.
The materials which are not attracted towards a magnet are known as non-magnetic materials. For example- plastic, glass etc.
Question 33. How do magnets lose their magnetic property? What can be done to keep them safe? [5 MARKS]
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Destroying magnetic properties: 2 Marks
Safety: 3 Marks
Magnets lose their properties if they are heated, hammered or dropped from some height. Also, magnets become weak if they are not stored properly.
Ways to keep magnets safe:
1. Theyshould be kept in pairs with their unlike poles on the same side.
2. For horseshoe magnet, one should keep a piece of iron across the poles.
3.Take care to protect the magnet against mechanical shock. Some magnets are brittle. They will crack or break if they fall on a hard surface or bang against metal or another magnet. Do not strike them with a hammer.
Question 34. Which the following will be attracted to a magnet? [2 MARKS]
Rubber, iron nails, steel pen, wood, cobalt, plastic, nickel
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Answer: 2 Marks
Iron nails, nickel, steel pen, and cobalt will be attracted to magnet and rest of the materials are non-magnetic in nature, so they will not be attracted toamagnet.
Question 35. In which direction does a freely suspended magnet align? [1 MARK]
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A freely suspended magnet always aligns in theNorth-South direction.
In Which direction Does a Freely Suspended Magnet Align? [...
Question 36. Write any three properties of a magnet. [3 MARKS]
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Each Point: 1 Mark
1.A magnet attracts magnetic materials towards itself.
2.A freely suspended bar magnet always aligns in the north-south direction.
3.Unlike poles attract each other and like poles repel each other.
Question 37. A magnet always has __________ poles.
  1.    four
  2.    one
  3.    two          
  4.    three
 Discuss Question
Answer: Option C. -> two          
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C
A magnet always has twopoles: anorth pole and a south pole. The poles of a magnet are represented in the figure below.
A Magnet Always Has __________ Poles.
Question 38. Steel pins sprinkled on a bar magnet is concentrated at ________ of the magnet.
  1.    ends
  2.    all locations 
  3.    middle
  4.    one end
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Answer: Option A. -> ends
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A
Most of the pins stick at the two extreme ends of the bar magnet because the magnetic field is maximum at the ends of the magnet. The ends of the magnetwhere the strength of the magnet is highest are called the poles of a magnet.
Question 39. An iron metal bar can be converted into a permanent magnet.
  1.    True
  2.    False
  3.    A magnet points in North-South direction when suspended freely.
  4.    A magnet points in East-West direction when suspended freely.
 Discuss Question
Answer: Option A. -> True
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A
One can transform aniron metal intoamagnet by rubbing a magnet on the surface of the iron metal bar.
Position the magnet against the iron rod suchthat only the chosen pole is touching the rod. Begin at one end of the rod and rub the magnet down the length of the rod in one continuous movement.
Due to the rubbing of magnet, the magnetic domains in iron piece will be aligned in one direction, after which the iron barwill start behavinglike a magnet.
This can be visualised by the diagram given below.
An Iron Metal Bar can Be Converted Into A Permanent magnet...
Question 40. Which of the following is NOT a magnetic material?
  1.    Cobalt
  2.    Iron
  3.    Plastic
  4.    Nickel
 Discuss Question
Answer: Option C. -> Plastic
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C
Cobalt, iron and nickel are attracted toa magnet.Hence, they are magnetic materials. Whereas, plastic can neither be magnetised nor it gets attracted toamagnet. Thus, it is a non-magnetic material.

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