Thermo Review

[SPM2017] Diagram shows a hot metal bob is immersed in water at a temperature of 30°C. If the initial temperature of the metal bob is 60°C, what is the temperature of the water when thermal equilibrium is achieved between the metal bob and the water?

• Higher than 60 °C

• Lower than 30 °C

• Between 30 °C and 60 °C

• Same as the room temperature

[SPM2018] A boy tries to break a metal wire by bending and straightening the wire repeatedly. After a while, the wire becomes hot. The metal wire becomes hot because

• the forces between molecules decrease

• the wire absorbs heat from the surrounding

• the kinetic energy of molecules of wire increases

• the potential energy of the molecule of wire increases

[SPM2016] Two different types of metal blocks, X and Y of the same mass are heated with the same amount of heat. The rate of temperature rise of metal block Y is slower than that of metal block X. Which statement is correct?

• Specific heat capacity of metal block X is smaller than that of metal block Y

• Metal block X stores more heat energy than metal block Y

• The latent heat of metal block X is the same with metal block Y

• The cooling rate of metal block X is slower than that of block Y

[SPM2017] Diagram shows a pan is used to fry pancakes. What is the suitable characteristic of the material used as the bottom surface of the pan?

• Low melting point

• Low boiling point

• Low specific heat capacity

• Low heat conductivity

[SPM2019] Diagram shows a balloon filled with water is brought to the burning candle. The balloon does not blow up even when it touches the flame. Which statement is correct to explain this situation?

• Water is a good heat conductor

• Balloon is a good heat conductor

• Water has high specific heat capacity

• Balloon has low specific heat capacity

[SPM2018] Diagram shows a graph of the relationship between temperature, θ and time, t when an ice changes gradually to steam. Which phase shows the process of the latent heat

of fusion being released?

• P

• Q

• R

• S

[SPM2017] Diagram shows a bubbles wrap which is normally used for packing fragile glassware. Air bubbles expand when the surrounding temperature increases.

• Boyle's Law

• Charles's Law

• Pressure Law

What is specific heat capacity?

• The power needed to raise the temperature of 1 kg of a substance by 1^oC.

• The energy needed to raise the temperature of 1 kg of a substance by 1^oC.

• The temperature increase of 1 kg of a substance when it is heated for 1 minute.

• The mass of a substance whose temperature will increase by 1^oC when heated for 1 minute.

What are the units for energy?

• Joules (J)

• Watts (W)

• Kilograms (kg)

• Seconds (s)

How do we say Δ in science and maths?

• Alpha

• Beta

• Gamma

• Delta