F4 Chapter 4.1 Thermal equilibrium

There are two identical object A and B which are in thermal contact. The initial temperature of A and B are 60°C and 20°C respectively. Which statement is correctly about M and N when the thermal equilibrium achieved?

• Temperature A is higher than B

• Temperature B is higher than A

• Net rate of heat flow between A and B is not zero

• Net rate of heat flow between A and B is equal to zero

Diagram shows a saucer. Wan Ying order a cup of hot coffee in a Kopi Tiam. The hot coffee is served with a saucer. which of the following statement explain the function of the saucer

• The waiter can carry the cup easily

• So the coffee can reach thermal equilibrium easily

• To prevent the coffee to reach thermal equilibrium easily

• so Wan Ying can drink the coffee faster

Alice Liew is drinking her lovely chicken soap. She place the spoon into the bowl of soup at 95°C. Which statement is correct when thermal equilibrium is reached?

• Temperature of the soup unchanged

• Temperature of the spoon is unchanged

• No heat flow between soup and spoon

• Soup and the spoon has the same temperature

Anneliese Joelle Then is pouring he hot soup into a bowl. Which statement is correct

• Net heat flow from the hot soup to the bowl

• Net heat flow from the bowl to the soup

• heat flows only from hot soup to the bowl

• Net heat flow is zero

Kendrick Tang is having a high fever, he uses cold towel to put on his forehead because

• Heat flow faster from the towel to the forehead

• Heat flow faster from the forehead to the towel

• Net heat flow is equal to zero

• His mother ask him to do so

Mercury is used in the liquid in glass thermometer. which of the following statement is wrong

• It has high melting point and low boiling point

• Opaque

• It expand uniformly when heated

• good heat conductor

The sensitivity of the liquid in glass thermometer can be increase by

• longer the stem

• use a wider capillary tube

• use a thicker glass at steam

• use a thinner glass at the bulb

If liquid in glass thermometer shows the length of 4cm when placed in the ice cube. 29cm showed when it is placed into the boiling water. 14cm shown when the thermometer is placed at the warm liquid. Calculate the temperature of the warm liquid

• 30°C

• 40°C

• 50°C

• 60°C

A thermocouple is placed used to determine the temperature of a drink. When the 2 ends is place at in ice cube and boiling water, there is 15mA of current flow through the thermocouple. But when the 2 ends is place into ice cube and the drink. The current flow through the thermocouple is only 8mA. Find the temperature of the drink.

• 15.3°C

• 17.9°C

• 20.7°C

• 53.3°C

When a thermometer is place into the ice cube. The length shown is 6cm. When the thermometer is placed into the boiling water, the length of the thermometer is 16cm. Find the length of the reading of a liquid with a temperature of 15°C.

• 7.5cm

• 8.5cm

• 9.5cm

• 4.5cm