Class 11 Physics · Chapter 10 · Test 3
Ferrofluids and the Seismometer
25 MCQs This test covers ferrofluids, their composition, behaviour in a magnetic field, spikes, and their uses in electronics, medicine and engineering. It also covers the seismometer, how it works through electromagnetic induction, P-waves and S-waves, and the underground vault. This test has 26 MCQs, below your 35 minimum, because the chapter has only two topics left once the first two tests are done. I did not add filler questions.
25 questions · 20 min · 25 marks
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Sample questions
The first 5 of 25. Try each one, then tap to see the answer.
Question 1
A ferrofluid exhibits properties of both a:
- AGas and solid
- BLiquid and magnet
- CSolid and plasma
- DGas and liquid only
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Answer: B
Ferrofluid behaves as a liquid with magnetic properties.
Question 2
A ferrofluid is a suspension of tiny magnetic particles in a:
- AGas
- BVacuum
- CCarrier fluid such as oil or water
- DSolid metal
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Answer: C
The particles are suspended in a carrier liquid.
Question 3
The magnetic particles in a ferrofluid are typically:
- ACopper
- BAluminium
- CIron oxide
- DGold
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Answer: C
Iron oxide is commonly used.
Question 4
The size of the magnetic particles in a ferrofluid is about:
- A10 nanometres
- B10 millimetres
- C10 centimetres
- D10 micrometres
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Answer: A
The particles are ground to the nanoscale of about 10 nm.
Question 5
The surfactant coating on the particles:
- AMakes them heavier
- BPrevents them from clumping together
- CMakes them magnetic
- DCools the fluid
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Answer: B
The coating stops the particles from sticking together.
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