Class 9 Physics · Chapter 8 · Test 2
Electromagnets and Their Applications
54 MCQs
54 questions · 45 min · 54 marks
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Sample questions
The first 5 of 54. Try each one, then tap to see the answer.
Question 1
What is an electromagnet?
- AA magnet made by permanently magnetising glass
- BA magnet produced when electric current passes through a coil
- CA magnet that works without a magnetic field
- DA magnet made only from plastic
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Answer: B
An electromagnet is produced when current through a coil magnetises an iron core.
Question 2
Which core is commonly used in an electromagnet?
- ASoft iron
- BGlass
- CWood
- DPlastic
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Answer: A
Soft iron is easily magnetised and demagnetised.
Question 3
What happens when the current through an ordinary electromagnet is switched off?
- AIts magnetic effect greatly decreases or disappears
- BIts magnetic field always becomes stronger
- CIt becomes a permanent magnet in every case
- DIts iron core changes into steel
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Answer: A
An electromagnet is a temporary magnet and normally loses its magnetism when current stops.
Question 4
Which components are needed for the textbook electromagnet activity?
- AIron nail, insulated wire, battery and switch
- BGlass rod, paper and water
- CPlastic ruler and thermometer
- DWooden block and string only
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Answer: A
The activity uses a wire coil around an iron nail connected to a battery through a switch.
Question 5
What happens when the switch in an electromagnet circuit is turned on?
- ACurrent passes through the coil and magnetises the iron nail
- BThe coil loses all magnetic properties permanently
- CThe nail becomes a non-magnetic material
- DThe battery stops supplying current immediately
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Answer: A
Current in the coil creates a magnetic field that magnetises the iron core.
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