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- 1. Multiple Choice
What is Brownian motion?
The movement of water molecules in a beaker
The movement of air molecules
The movement of solid molecules
The movement of smoke particles in air
- 2. Multiple Choice
Pollen grains suspended in water exhibit Brownian motion. How does a particle undergoing Brownian motion move?
In smooth curves
Randomly
Orderly with a pattern
In straight lines with no change of direction
- 3. Multiple Choice
A student makes an observation using a microscope. He observed some particles which were moving in a zig-zag way. What particles could these NOT be?
Smoke particles in air
Dust particles in a room
Pollen grains in water
Molecules in a solid bar of steel
- 4. Multiple Choice
Which of the following does NOT describe Brownian motion?
- 5. Multiple Choice
Light and fast moving particles can move heavier particles. Which one is a correct example of the light and the heavy particle?
Light : air molecule, Heavy : water molecule
Light : air molecule, Heavy : smoke particle
Light : smoke particle, Heavy : air molecule
Light : pollen grain , heavy : water molecule
- 6. Multiple Choice
What evidence does Brownian motion provide about molecules of a gas or liquid?
Molecules are close together
Molecules are far apart
Molecules move continously but randomly
Molecules move continously and randomly
- 7. Multiple Choice
Which of these is under greater pressure?
- 8. Multiple Choice
Which of these under greater pressure?
- 9. Multiple Choice
Which of these under greater pressure?
- 10. Multiple Choice
When gas particles bump into something, ...
they cause pressure
they cause density
- 11. Multiple Choice
Pressure is increased ...
when less particles hit the side
when more particles hit the side
- 12. Multiple Choice
When you blow up a balloon, it gets bigger because ...
pressure increases inside
pressure decreases inside
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