Physics Quiz Thermal Heat Transfer

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Presentation transcript:

Physics Quiz Thermal Heat Transfer

Question 1 What is the method of heat transfer from the heater to the metal plate? Answer: Radiation

Question 2 What is the method of heat transfer from the metal plate to the wax? Answer: Conduction

Question 3 What is the method of heat transfer from the wax to the cork? Answer: Conduction

Question 4 Which stopper will slide down first? Why? Answer: Stopper from the dull black metal plate because black is a better absorber of heat than shiny surface.

Question 5 Which heat transfer method(s) will the vacuum layer of the thermal flask help to minimise? Answer: Conduction and Convection

Question 6 Which heat transfer method(s) will the silvered wall of the thermal flask help to minimise? Answer: Radiation

Question 7 Which heat transfer method(s) will the plastic cap of the thermal flask help to minimise? Answer: Conduction (since it is made of an insulator) and Convection (since it does not allow convection current to transfer heat out of the flask)

Question 8 Hot substance Styrofoam box Styrofoam box is used to contain hot substances because styrofoam is a good ………………… Answer: insulator

Question 9 Besides colour and texture, what are the other factors that will affect the rate of heat transfer by radiation? Answer: Surface temperature and surface area

Question 10 What is the colour of the cooling fin? Answer: Black (Black is a good emitter of heat)

Question 11 Metal is the material used for cooling fin because it is a good ………………… Answer: conductor

Question 12 - True or False Radiation of heat can take place without a medium Answer: True

Question 13 - True or False Convection of heat is caused by molecular vibration. Answer: False Convection is caused by density difference. Molecular vibration causes conduction of heat

Question 14 - True or False Poor conductors are good insulators. Answer: True

Question 15 - True or False Gases are better conductor than solids. Answer: False (Gas particles are very far apart hence it is difficult to transfer heat by molecular vibration among the particles.)

Question 16 - True or False Convection can take place in gas and liquid only. Answer: True

Question 17 - True or False Shiny surfaces are good absorber of heat. Answer: False Shiny surface will reflect heat hence it is a poor absorber of heat.

Question 18 - True or False Black and rough surfaces are good emitter of heat. Answer: True

Question 19 - True or False Hot tea in a black cup cools down faster than hot tea in a white cup. (Assuming the temperature of the tea in both cups are the same and the material of the cups are the same. Answer: True

Question 20 - True or False Metals are better conductor than non-metals. Answer: True (because metals have free electrons that helps in heat transfer by molecular vibration)