Question 11
Question 11 of 40
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No letter options?
Older MCQs might not have the typical A, B, C, D choices. They have choices 1, 2, 3, and a combination of them is the answer. Below is the key that maps such combinations to the answer.
A 1, 2 and 3 are correct
B 1 and 2 only are correct
C 2 and 3 only are correct
D 1 only is correct
Topics Tested
1. Motion, forces and ene...
1.7.4. Efficiency

Define efficiency as: (a) (%) efficiency = (useful energy output) / (total energy input) × 100% (b) (%) efficiency = (useful power output) / (total power input) × 100% and recall and use these equations

2. Thermal physics
2.3.3. Radiation

Describe how the rate of emission of radiation depends on the surface temperature and surface area of an object

4. Electricity and magnet...
4.4.1. Uses of electricity

Recall and use the equation energy = current × voltage × time, E = IVt