DP Physics (last assessment 2024)
Question 18M.3.SL.TZ1.7d
| Date | May 2018 | Marks available | [Maximum mark: 1] | Reference code | 18M.3.SL.TZ1.7d |
| Level | SL | Paper | 3 | Time zone | TZ1 |
| Command term | Outline | Question number | d | Adapted from | N/A |
d.
[Maximum mark: 1]
18M.3.SL.TZ1.7d
The pressure–volume (pV) diagram shows a cycle ABCA of a heat engine. The working substance of the engine is 0.221 mol of ideal monatomic gas.
At A the temperature of the gas is 295 K and the pressure of the gas is 1.10 × 105 Pa. The process from A to B is adiabatic.
(d)
Outline why an efficiency calculation is important for an engineer designing a heat engine.
[1]
Markscheme
to reduce energy loss; increase engine performance; improve mpg etc
Allow any sensible answer.
[1 mark]
