F4 Phys 4.1

Which design features will increase the sensitivity of this thermometer?

• Bulb = Thin, Capillary tube = Narrow
• Bulb = Thin, Capillary tube = Wide
• Bulb = Thick, Capillary tube = Narrow
• Bulb = Thick, Capillary tube = Wide

A doctor puts a clinical thermometer into the mouth of a patient and waits for 1 minute before taking the reading. What is the concept used in the measurement?

• Conservation of heat
• Conservation of energy
• Thermal equilibrium
• Thermal conductivity

There are two copper blocks, W and X touching each other. The initial temperature of W and X are 70°C and 40°C respectively. Which of the following statement is correct when W and X are at thermal equilibrium?

• Temperature of W is higher than X
• The quantity of theat in W is same as in X
• Net rate of heat flow between W and X is zero
• Rate of change in temperature of W is higher than X

What is the physical property that change with temperature in a liquid-in-glass thermometer?

• Mass
• Volume
• Melting point
• Boiling point

Which of the following is true?

• The unit of heat is °C
• Heat is a form of energy
• Heat flows from a cold substance to a hot substance

A thermometer is inserted into a hole in an aluminium block which has a little oil in it. Oil is used

• to transfer heat by convection.
• to insert the thermometer easily.
• to increase the conductivity of heat.
• to reduce loss of heat to the surrounding.

An oven is used to bake a cake. After 40 minutes, the cake reaches thermal equilibrium. When is the thermal equilibrium reached?

• When the oven has reached its maximum temperature.
• When all the heat from the oven has transferred to the cake.
• When the temperature of the cake is higher than the temperature of the oven
• When the rate of heat transfer between the cake and the oven is equal.

Mercury is used in thermometer because it

• stick to the glass
• has a lower boiling point.
• expand and contracts uniformly.
• is opaque and therefore it is easier to read.

A mercury thermometer is not calibrated. The length of mercury column in the thermometer is 5 cm at 0°C and 50 cm at 100°C. When the ammeter is placed on hot water, the length of the mercury column is 35 cm. What is the temperature of hot water?

• 35.0°C
• 40.0°C
• 66.7°C
• 70.0°C

A cold milk is being added to a hot tea. Which of the following statement is true if there are no heat loss to the surroundings?

• Heat gained by cold milk is less than heat loss by hot tea
• Heat gained by cold milk is greater than heat loss by hot tea.
• Heat gained by cold milk is equal to heat loss by hot tea.