Efficiency O Level Physics MCQ (Multiple Choice Questions) PDF Download

Output of a truck is 4500 J and its efficiency is 50%, the input energy provided to the truck is

1. 5000 J
2. 900 J
3. 9000 J
4. 500 J

In a typical power station, amid a series of energy transfers and conversions, about 70% of the energy input gets wasted in the form of thermal energy, the efficiency of such a power station is about

1. 0.3
2. 0.4
3. 0.7
4. 1

A car uses total energy of 2500 J and the output is 750 J. The efficiency of the car is

1. 50%
2. 30%
3. 25%
4. 80%

Formula for efficiency is

1. (energy input / energy output) × 100
2. (energy input / energy output) × 100
3. (useful energy input / energy output) × 100
4. (useful energy output / total energy input) × 100

Efficiency of a machine is measured by

1. (Wasted Energy Output ⁄ Energy Input) × 100 %
2. (Energy Input ⁄ Wasted Energy Output) × 100 %
3. (Useful Energy Output ⁄ Energy Input) × 100 %
4. (Energy Input ⁄ Useful Energy Output) × 100 %