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IGCSE O Level Physics Certification Exam Tests

IGCSE O Level Physics Practice Test 10

# Efficiency: O Level Physics MCQ (Multiple Choice Questions) PDF - 10

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The MCQs: In a typical power station, amid a series of energy transfers and conversions, about 70% of energy input gets wasted in form of thermal energy, efficiency of such a power station is about; "Efficiency: O Level Physics" App (Android & iOS) with answers: 0.4; 0.3; 0.7; 1; to study online certificate courses. Practice Energy, Work and Power Questions and Answers, Google eBook to download free sample for online degree programs.

## Efficiency: O Level Physics Questions and Answers : Quiz 10

MCQ 46: 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

MCQ 47: Mass of oil is 11040 kg and the volume is 12 m³, its density would be

1. 92 kg m-3
2. 920 kg m-3
3. 9.2 kg m-3
4. 1.08 × 10-3

MCQ 48: When the state is being changed from gas to liquid through the process of condensation, the temperature

1. increases
2. decreases
3. remains constant
4. may increase or decrease

MCQ 49: Sound passes from one place to another in the form of

1. rays
2. waves
3. energy
4. light

MCQ 50: If a cup of tea at 50 °C is allowed to cool to room temperature, heat released would be (assume room temperature to be equal to 25 °C and heat capacity of the cup and tea to be = 5.0 kJ ⁄ K)

1. 25 kJ
2. 50 kJ
3. 125 kJ
4. 250 kJ

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