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- 1. Multiple Choice
Strength of a magnet is _____ at its _____.
maximum, centre
minimum, centre
maximum, ends
minimum, ends
- 2. Multiple Choice
An electromagnet can be used in constructing _____.
- 3. Multiple Choice
Pick the correct statement(s) related to “properties of magnets”.
Like poles attract each other.
Unlike poles repel each other.
Attraction is the surest test of magnetism.
Repulsion is the surest test of magnetism.
- 4. Multiple Choice
An electromagnet built with a core of ______ is a temporary magnet.
soft iron
steel
copper
glass
- 5. Multiple Choice
Identify the method of magnetisation shown in the picture below.
Single touch method
Double touch method
Electromagnetic induction
Divided touch method
- 6. Multiple Choice
_____ can demagnetise a magnet.
Cooling
Hammering
Rubbing
Washing
- 7. Multiple Choice
Riya is building a scrap remover machine that will use a magnet to remove iron parts from the garbage dump and deposit it elsewhere. What kind of magnet will she use in her project?
Bar magnet
Dumb bell magnet
Electromagnet
Horseshoe magnet
- 8. Multiple Choice
A bar magnet is cut into 4 pieces. Each piece is a _____.
complete magnet
north pole of a magnet
south pole of a magnet
plain iron bar that has lost its magnetism.
- 9. Multiple Choice
A steel bar can be permanently magnetised by rubbing a bar magnet _____.
at its ends
in the centre
along the length
in zig-zag fashion along its width.
- 10. Multiple Choice
Match the following .
{a-I, b-II, c-IV, d-III}
{a-II, b- III, c-IV, d-I}
{a-II, b-I, c-III, d-IV}
{a-IV, b-II, c-I, d-III}
- 11. Multiple Choice
_____ core of the electromagnet will result in the creation of a permanent magnet.
Soft iron
Copper
Steel
Gold
- 12. Multiple Choice
When a steel board pin is in close proximity with a permanent magnet’s south pole, it acquires ____ polarity at its farthest end.
south
north
either north or south
both north and south
- 13. Multiple Choice
A thin pointed magnetised steel needle used for finding geographic directions is called as a____ .
- 14. Multiple Choice
A box contains coins made out of nickel, silver and copper. How can you separate the nickel coin from the rest without using your hand?
Make a hole matching the size of the nickel coins so that they can be shaken out of the box.
Use a powerful bar magnet to separate magnetic substances such as nickel from the rest.
Melt the contents of the box and drain off the other metals leaving nickel out.
Pour water into the box, nickel coins will float on the surface as they are light in weight.
- 15. Multiple Choice
The strength of an electromagnet can be increased by _____.
increasing the current flowing through the circuit
increasing the number of turns of the coil
both a and b
changing the core of the electromagnet to platinum
- 16. Multiple Choice
The phenomenon due to which a piece of steel or iron behaves like a magnet when placed near a strong magnet is called _____.
magnetic induction
magnetic dipole
electromagnetism
demagnetisation
- 17. Multiple Choice
In permanent magnets, the polarity cannot be ___________.
maintained
induced
experienced
reversed
- 18. Multiple Choice
Though I am a permanent magnet, my strength is less when compared to temporary magnets. Who am I?
Copper
Soft iron
Steel
Zinc
- 19. Multiple Choice
The ____ and ____ of temporary magnets can be changed .
strength, permanence
strength, polarity
polarity, permanence
polarity, electromagnetism
- 20. Multiple Choice
A magnet can be demagnetized by allowing alternating current to flow through the coil around the magnet and keeping it facing in the ____ direction.
north-south
east-west
north-east
south-east
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