A-LevelPhysicsWork, energy and power9702/12 · Feb/Mar 2018 · Q151 Mark

An old-fashioned 60 W lamp converts 95% of its energy supply into heat. A 4.0 W modern lamp has the same power output of light as the old-fashioned lamp. What is the efficiency of the modern lamp?

A5.0%

B6.7%

C75%

D95%

✓ Correct answer

C: 75%

Oracle Prep sorts past-paper questions by topic, so you can drill Work, energy and power and see which topics are most likely to come up next.

Topic: Work, energy and power, A-Level Physics (syllabus 9702). Multiple choice, 1 mark.
Source: A-Level Physics, Feb/Mar 2018 Paper 1 Variant 2, question 15.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content

A crane is being used to lift containers off a ship. One container has a mass of 14 000 kg and is being lifted vertic…

The data below are taken from a test of a petrol engine for a motor car. power output = 150 kW fuel consumption = 20 …

A ball is thrown vertically upwards from the surface of the Earth. Which statement describes the energy of the ball a…

A distant star is receding from the Earth with a speed of 1.40 × 10⁷ m s⁻¹. It emits light of frequency 4.57 × 10¹⁴ H…

Diffraction is a term used to describe one aspect of wave behaviour. What does diffraction make possible?

Monochromatic light of wavelength 5.30 × 10⁻⁷ m is incident normally on a diffraction grating. The first order maximu…