Class 9 Physics · Chapter 8 · Test 4
Magnetisation and Magnetic Domains
52 MCQs
52 questions · 40 min · 52 marks
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Sample questions
The first 5 of 52. Try each one, then tap to see the answer.
Question 1
What causes the magnetic field of an atom according to the chapter?
- AElectron orbital motion and spin
- BMotion of protons around the nucleus
- CMovement of the whole atom around Earth
- DThe expansion of the nucleus
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Answer: A
The chapter explains that electron orbital motion and spin produce an atomic magnetic field.
Question 2
What is a magnetic domain?
- AA small region in a ferromagnetic material that acts like a magnet
- BA region with no atoms
- CA type of non-magnetic liquid
- DA gap between two separate magnets
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Answer: A
A domain is a small region in which atomic magnetic effects are aligned.
Question 3
How are domains arranged in an unmagnetised ferromagnetic material?
- AIn different directions, so their effects largely cancel
- BAll permanently in one direction
- COnly toward the north geographic pole
- DIn a single straight line outside the material
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Answer: A
Randomly oriented domains produce little or no overall magnetism.
Question 4
What happens to domains when a ferromagnetic material is placed in an external magnetic field?
- ADomains aligned with the field grow, and other domains may rotate
- BAll domains disappear
- CEvery domain becomes non-magnetic permanently
- DThe atoms leave the material
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Answer: A
An applied field favours domains aligned with its direction.
Question 5
Which material is given as an example of a ferromagnetic material?
- AIron
- BWater
- CBismuth
- DCopper
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Answer: A
Iron is listed among the ferromagnetic materials in the chapter.
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