Curriculum
Course: IB Physics HL
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Curriculum

IB Physics HL

Theme A — Space, Time and Motion

0/125 Dr Dabour Hub Science Diagram and Course Material

Theme B — The Particulate Nature of Matter

0/105 Dr Dabour Hub Science Diagram and Course Material

Theme C — Wave Behaviour

0/73 Dr Dabour Hub Science Diagram and Course Material

Theme D — Fields

0/77 Dr Dabour Hub Science Diagram and Course Material

Theme E — Nuclear and Quantum Physics

0/89 Dr Dabour Hub Science Diagram and Course Material

Tools and Inquiry — IB Physics skills

0/43 Dr Dabour Hub Science Diagram and Course Material
Quiz

B.4.7 Heat Engines – Check yourself

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  • Questions count: 6
  • Passing grade: B+
  • Time limit: 10 minutes
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1.
The efficiency of a heat engine is
W/Qh
W/Qc
Qc/Qh
Qh/W
2.
An engine absorbs 800 J and rejects 600 J per cycle. Its efficiency is
75%
25%
33%
200%
3.
Over one complete cycle of an engine, the change in internal energy of the working gas is
equal to the work done
equal to Qh
zero
equal to Qc
4.
The net work done in a cycle on a p–V diagram is given by
the area under the highest line
the largest pressure
the gradient of the loop
the area enclosed by the loop
5.
A power station is 40% efficient and wastes 900 MW as heat. The electrical output is
360 MW
600 MW
1500 MW
540 MW
6.
Which statement about heat engines is correct?
They can have an efficiency of 100% if friction is eliminated
They create energy
They must reject some heat to a colder reservoir
They need no hot source
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Part of Theme B — The Particulate Nature of Matter — see every lesson and quiz in this unit.
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