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Heat Transfer Conduction Convection Radiation — Free MYP3 Sciences Practice Questions
1QuestionComparing the Three Modes of Heat TransferConcept Practice
2 marks~3 minCriterion A
A person stands near a campfire on a still evening. No wind is blowing, and the person is not touching the fire.
a
Identify the method of heat transfer that allows the person to feel warmth from the campfire. [1]
b
Explain how this method of heat transfer allows energy to travel from the fire to the person. [1]
Solutions
2QuestionComparing the Three Modes of Heat TransferAssessment Practice
12 marks~18 minCriterion C
Three identical boxes are insulated with cotton, wool, or aluminium foil. A heat lamp is placed equidistant from each box. Temperature inside each box is recorded every 5 minutes.
| Time (min) | 0 | 5 | 10 | 15 | 20 |
|---|---|---|---|---|---|
| Cotton (°C) | 20 | 25 | 29 | 32 | 34 |
| Wool (°C) | 20 | 23 | 26 | 28 | 29 |
| Foil (°C) | 20 | 35 | 50 | 62 | 72 |
a
Identify which box has the smallest temperature increase between 0 and 20 minutes, and calculate that total increase. [2]
b
Explain why wool reduces heat transfer more effectively than cotton, using the concepts of conduction and convection. [4]
c
Analyse the data for all three materials and justify which box will have the lowest temperature at 30 minutes, using evidence from the table and your knowledge of heat transfer by radiation. [6]
Solutions
3QuestionComparing the Three Modes of Heat TransferConcept Practice
3 marks~5 minCriterion B
A student investigates which metal heats up fastest in hot water. She places equal-sized rods of copper, aluminium, and iron into separate containers, each holding the same volume of water at the same starting temperature. She records the temperature of each rod every minute for 5 minutes.
a
Identify the independent variable in this investigation. [1]
b
Identify the dependent variable and explain why it is measured every minute rather than only at the end of 5 minutes. [1]
c
The copper rod reaches 48 °C after 3 minutes, while the iron rod reaches only 39 °C. Suggest one reason, in terms of heat transfer, why copper heats up faster than iron. [1]
Solutions
4QuestionComparing the Three Modes of Heat TransferAssessment Practice
12 marks~18 minCriterion D
A farmer grows plants in a greenhouse. The transparent glass walls allow sunlight to enter. During summer, the inside temperature can reach 45 °C on hot days; during winter, the outside temperature can drop to −5 °C at night.
a
Describe the role of each of the three modes of heat transfer — conduction, convection, and radiation — in heating the greenhouse interior. [3]
b
Explain one advantage of using a greenhouse to grow plants compared with growing them outdoors. [2]
c
Analyse how the greenhouse performs poorly in each of the two extreme conditions described: a summer day at 45 °C and a winter night at −5 °C. For each condition, identify the problem and explain why the greenhouse structure alone cannot solve it. [7]
Solutions
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