Physics F4C4 Heat

[SPM2015]

Hot soup is poured into a bowl. Which statement is correct about the heat flow?

• Net heat flow is from the hot soup to the bowl

• Heat flows only from the bowl to the hot soup

• Heat flows only from the hot soup to the bowl

• Net heat flow is zero

[SPM2016] Diagram shows a cup of hot coffee is left to cool until it achieves room temperature. Which statement is correct about the coffee at room temperature?

• Heat loss by hot coffee is equal to heat loss by the surrounding

• Heat loss by hot coffee is less than heat gain by the surrounding

• Heat loss by hot coffee is greater than heat gain the surrounding

• Heat loss by hot coffee is equal to heat gain by the surrounding

[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

[SPM2019] Diagram shows a man sits near a camp fire in an igloo to warm up his body. What will happen when thermal equilibrium is achieved?

• The body temperature increases

• The air temperature inside the igloo decreases

• Net heat flow is from the air inside the igloo to the man's body

• No net heat flow between the air inside the igloo and the man's body

[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

[SPM2016]

1 cm³ of ethanol and I cm³ of water are poured onto a table. Ethanol evaporates faster compared to water because

• the density of ethanol is lower than the density of water

• the mass of ethanol is smaller than the mass of water

• the specific latent heat of ethanol is lower than the specific latent heat of water

• the specific heat capacity of ethanol is lower than the specific heat capacity of water

[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