Energy efficiency and conservation

Question 1 of 10

Replacing ten 60 W bulbs with 9 W LEDs used 5 hours a day saves how much energy per day?

A. 2.55 kWh B. 0.51 kWh C. 3 kWh D. 0.45 kWh

Question 2 of 10

A solar water heater costs GH¢3,000 and saves GH¢500 a year in electricity. What is the payback period?

A. 15 years B. 5 years C. 6 years D. 2 years

Question 3 of 10

U-value in building insulation measures

A. the rate of heat transfer through a material B. its colour C. its weight D. its cost

Question 4 of 10

An energy audit identifies

A. where energy is wasted and how to save it B. the cost of food C. the number of staff D. tax owed

Question 5 of 10

A survey of how and where a building uses energy, to find savings, is an

A. environmental impact only B. energy audit C. insurance claim D. architectural drawing

Question 6 of 10

Switching off appliances at the socket saves

A. standby power B. water C. gas D. nothing

Question 7 of 10

LED bulbs are more energy-efficient than incandescent bulbs because they

A. convert more electricity into light and less into heat B. are brighter always C. are bigger D. use gas

Question 8 of 10

An energy-efficient refrigerator has

A. a higher energy rating label B. a lower rating C. no label D. more noise

Question 9 of 10

Replacing filament bulbs with LED bulbs saves energy because LEDs

A. need no electricity B. use higher voltage C. are brighter at all times D. convert more of the electricity into light and less into heat

Question 10 of 10

Insulating a building reduces

A. heat transfer and energy use for cooling B. light C. water supply D. air quality

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New set of questions

Questions written by OtisamLMS in the style of the WASSCE. They are not WAEC past questions.

Past questions, worked solutions and curriculum-mapped study material for JHS and SHS students and teachers in Ghana.

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