Thermal Insulation and Energy in the Home Quiz
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5 questions, one answer each
Each answer is checked as you go, with why.
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1. A material with high thermal conductivity transfers heat by conduction...
- A. More slowly
- B. At the same rate as any material
- C. More quickly
- D. Not at all
2. Which of the following is a form of thermal insulation used in homes?
- A. A copper pipe
- B. Cavity wall insulation
- C. A steel girder
- D. An aluminium window frame
3. Calculate the energy needed to raise the temperature of 2 kg of water (c = 4200 J/kg°C) by 15°C.
- A. 6,300 J
- B. 12,600 J
- C. 126,000 J
- D. 210,000 J
4. Why do thick, low-conductivity walls keep a house warmer for longer?
- A. They increase the rate of conduction
- B. They reduce the rate of thermal energy transfer out of the house
- C. They have no effect on heat loss
- D. They increase the specific heat capacity of the air
5. A boiler is supplied with 8000 J of energy and delivers 6000 J of useful thermal energy to a home. What is its efficiency?
- A. 0.6
- B. 0.75
- C. 0.8
- D. 1.33