Class 12 Physics · Chapter 1 · Test 1
Brownian Motion and Pressure
35 MCQs
35 questions · 30 min · 35 marks
Sample questions
The first 5 of 35. Try each one, then tap to see the answer.
Question 1
A large system containing many atoms or molecules is called a:
- AMacroscopic system
- BMicroscopic system
- CIsolated system
- DIdeal system
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Answer: A
A system with many atoms or molecules is macroscopic while a system of a single atom or molecule is microscopic.
Question 2
Which pair of properties belongs to a microscopic system?
- ATemperature and pressure
- BKinetic energy and momentum
- CPressure and volume
- DTemperature and density
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Answer: B
Microscopic systems have properties such as kinetic energy and momentum.
Question 3
Which pair of properties is a thermal property of a whole macroscopic system?
- AMomentum and kinetic energy
- BMass and speed of one molecule
- CTemperature and pressure
- DVelocity and position of one atom
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Answer: C
Temperature and pressure describe the whole system and can be studied without reference to the molecular nature of matter.
Question 4
In thermal physics the number of particles dealt with is of the order of:
- AMillions
- BBillions
- CTrillions
- DAvogadro's number
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Answer: D
Thermal physics deals with a very large number of particles of the order of Avogadro's number.
Question 5
Brownian motion was observed under a microscope by the botanist:
- ARobert Brown
- BAlbert Einstein
- CJ. Perrin
- DJames Clerk Maxwell
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Answer: A
The botanist Robert Brown observed the random motion of tiny particles under a microscope.
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