IGCSE · 2 · multiple choice
Thermal physics · Question 1
Thermal physics · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- recall
- Marks
- 1
- Topics
- 1
- Answer
- Complete
Which row describes the molecules of a gas?
| separation | arrangement | motion | |
|---|---|---|---|
| A | close together | regular | vibrating about fixed positions |
| B | close together | random | moving past one another |
| C | far apart | random | moving rapidly in all directions |
| D | far apart | regular | vibrating about fixed positions |
- A
close together · regular · vibrating about fixed positions
- B
close together · random · moving past one another
- C
far apart · random · moving rapidly in all directions
- D
far apart · regular · vibrating about fixed positions
Ready to self-mark?Reveal the detailed answer guide
Answer and reasoning
Predict from the governing principle before looking for a matching option. Then reject alternatives by checking direction, units, limiting behaviour or the physical meaning of each statement.
- 1
The correct choice is C: far apart · random · moving rapidly in all directions
- 2
A is a solid — close together, regular, vibrating in place. B is a liquid: close together but disordered and able to move past one another. D is the trap, pairing a gas separation with solid motion, and it catches candidates who have learned that gas molecules are far apart without learning what they then do.
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