IB myp 4-5 physics – Practice Questions- All Topics
Topic :Heat ,Light and Sound- Heat Transfer
Topic :Heat– Weightage : 21 %
All Questions for Topic : Thermal energy, conduction, convection, radiation, measuring temperature
Question (9 marks)
The question is about , ice cubes made from pure water melting in glasses of pure and salt water. The ice cubes have been coloured so they are more visible while melting. The ice cube in pure water melts faster than the ice cube in salt water.
Question a (1 mark)
There are three methods of heat transfer. Select the most appropriate description for each method.
▶️Answer/Explanation
Ans:
Question b (1 mark)
Select the diagram that best represents the process of heat energy transfer between the ice cube and the water.
▶️Answer/Explanation
Ans:
Conduction is the transfer of heat energy through a material without any bulk motion of the material itself. In this case, the ice cube and the water are in direct contact with each other, and the heat is transferred from the warmer water to the colder ice cube through molecular collisions between the molecules of the two materials.
Radiation is the transfer of heat energy through electromagnetic waves, such as light or infrared radiation. In this case, neither the ice cube nor the water are emitting any significant amount of electromagnetic radiation, so radiation is not a significant mode of heat transfer.
So , the correct option will be (D)
Question c (1 mark)
The ice cube in pure water melts faster than the ice cube in salt water, tiny water droplets begin to form on the outside of each glass. State the physical change that is shown by the formation of these water droplets.
▶️Answer/Explanation
Ans: