IB · B · multiple choice
The particulate nature of matter · Question 5
The particulate nature of matter · Original GioPhysics question with a detailed, mark-by-mark answer guide.
- Demand
- demanding
- Marks
- 1
- Topics
- 1
- Answer
- Complete
An ideal gas is compressed adiabatically. Which statement is correct?
- A
No thermal energy enters or leaves the gas, and its temperature falls.
- B
No thermal energy enters or leaves the gas, and its temperature rises.
- C
Thermal energy leaves the gas, and its temperature stays constant.
- D
Thermal energy enters the gas, and its temperature rises.
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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 B: No thermal energy enters or leaves the gas, and its temperature rises.
- 2
A gets the definition right and the consequence wrong. In an adiabatic process Q = 0, so ΔU = W: work done on the gas raises its internal energy with nowhere for the energy to escape, and the temperature rises. C describes an isothermal compression.
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