What is meant by in the context of insulating a building?
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The time taken to pay off any loans that you needed
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How long it takes you to get your revenge on the builder after they have done a poor job
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How long it takes to get a grant from the government for the insulation work
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A measure of how cost-effective the insulation is
Q.2.
What are U-values?
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A measure of the thickness of an insulator
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A measure of the temperature of an insulator
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A measure of how fast heat can pass through an insulator
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A measure of the surface area of an insulator
Q.3.
How do solar hot water panels work?
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Heat radiation from the sun warms the water which is then pumped to a storage tank
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The light from the Sun is used to generate electricity that powers a water heater
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They absorb heat from the air
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They use heat escaping through the roof from inside the house to heat the water
Q.4.
Which of the following is a good reason for having solar hot water panels fitted?
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They do not release any gases into the air as they heat the water
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They reduce the bill for heating and hot water
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On cloudy days, the water is not very hot
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They work all year round
Q.5.
To heat the water in a domestic hot water storage tank from 42°C to 50°C, an immersion heater transfers 4,536 kJ of energy to the water. How much water is in the tank? The specific heat capacity of water is 4,200 J/kg C
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100 kg
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135 kg
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0.135 kg
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10 kg
Q.6.
The best insulators have what sort of U-value?
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A low U-value
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A high U-value
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A constant U-value
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A variable U-value
Q.7.
During the day, the Sun transfers energy to an outdoor swimming pool. The mass of water in the pool is 5,000 kg. The specific heat capacity of water is 4,200 J/kg °C. How much energy needs to be supplied to increase the water temperature by 5 C?
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105,000,000 J
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10.5 kJ
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21,000,000 J
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210 kJ
Q.8.
A homeowner has part of the outside brick wall of her house demolished and fits double-glazed glass doors in the gap. The U-value of the wall was 0.4 and the U-value of glass doors is 1.What does this mean?
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Her house is now better insulated
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She will save money on heating bills
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More heat will be lost from the house
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There will be no change to the amount of heat lost from the house
Q.9.
If it costs £2,000 to insulate the walls and roof of a house, how long will the payback time be if it saves £250 per year?
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2 years
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4 years
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8 years
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16 years
Q.10.
At night, a storage heater transfers electrical energy into thermal energy which is stored. During the day, the heat is released to warm the room. Which of the following would store the most thermal energy per kg?
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Aluminium - specific heat capacity 913 J/kgoC
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Water - specific heat capacity 4,200 J/kgoC
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Oil - specific heat capacity 3,850 J/kgoC
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Concrete - specific heat capacity 880 J/kgoC
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