1.1. A thermometer is used to measure the temperature inside a room in a house.

State a physical property that varies with temperature and can be used in a thermometer.

1.2. Fig. 6.1 shows how the temperature of the room changes between 6:00 pm and 11:00 pm.

A heater in the room is switched on at 6 pm. The room has a large window. A large amount of thermal energy is transferred through the window. The window in the room has thick curtains.

Closing the curtains reduces the loss of thermal energy from the room.

(i) Suggest the time at which the heater is switched off.

[1]

(ii) Suggest the time at which the curtains were closed and explain your answer. Use information from the graph.

[2]

1.3. In cool climates, people use mineral wool to reduce heat loss from houses. Mineral wool is made of fibres and trapped air, as shown in Fig.6.2.

Use words from the box to complete the sentences. Each word may be used once, more than once, or not at all.

Air is a good ............................................ .

  When air is trapped between fibres, it reduces heat loss by ..................................... and by ........................................ .