2.3.4. Consequences of thermal energy transfer
A subsection of Physics, 0625, through 2. Thermal physics
Listing 10 of 104 questions
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. shows how the temperature of the room changes between 6:00 pm and 11:00 pm. 6:00 pm 7:00 pm 8:00 pm 9:00 pm time of day 10:00 pm 11:00 pm temperature / °C 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. Suggest the time at which the heater is switched off. Suggest the time at which the curtains were closed and explain your answer. Use information from the graph. time explanation 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 . pocket of trapped air fibres Use words from the box to complete the sentences. Each word may be used once, more than once, or not at all. conductor conduction convection emitter insulator radiation radiator Air is a good . When air is trapped between fibres, it reduces heat loss by and by .
0625_m18_qp_32
THEORY
2018
Paper 3, Variant 2
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An electrical heater is placed on the floor of a room in a house. The heater is switched on. State the main process by which thermal energy is transferred to the air in all parts of the room. The heater has a power of 1.5 kW. The air in the room has a mass of 65 kg. The specific heat capacity of air is 720 J / (kg °C). Calculate the time it takes for this heater to raise the temperature of the air in the room from 8.0 °C to 15.0 °C. time = State two reasons why the time calculated in is smaller than the actual time taken to raise the temperature of the air in the room from 8.0 °C to 15.0 °C.
0625_m19_qp_42
THEORY
2019
Paper 4, Variant 2
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Complete the sentences with words that describe the main process of thermal energy transfer in each case. A man goes for a walk on a cold day. He touches a metal gate, which removes thermal energy from his hands by . He holds the sides of a cup containing a hot drink. His hands gain thermal energy by . Some farm workers have lit a fire. The man warms his hands by the side of the fire. His hands gain thermal energy by . Describe in terms of particles the transfer of thermal energy through the metal of the gate after transfer from the man’s hands. shows a car on a sunny day in a hot country. windscreen object A The object labelled A is placed inside the windscreen. It is used by the owner of the car to reduce the temperature rise of the air in the car. Ring the most suitable material for the outer surface of object A. Explain your choice. dull black dull white shiny black shiny white explanation
0625_m20_qp_42
THEORY
2020
Paper 4, Variant 2
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Questions Discovered
104