REVISION PHYSICS: HEAT

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1. Diagram 1 shows 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? *

5 points

Conservation of heat

Conservation of energy

Thermal equilibrium

Thermal conductivity

2. Diagram 2 shows two copper blocks, W and X touching each other. The initial temperature of W and X are 70ºC and 40ºC respectively. Which statement is correct when P and Q are at thermal equilibrium? *

5 points

Temperature of W is higher than X

The quantity of heat 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 that of X

3. What is the physical property that changes with temperature in a liquid-in-glass thermometer? *

5 points

Mass

Volume

Melting point

Boiling point

4. Diagram 3 shows a mercury thermometer which has not been calibrated. The length of mercury column in the thermometer is 5 cm at 0 ºC and 50 cm at 100 ºC. When the thermometer is placed in hot water, the length of the mercury column is 35 cm. What is the temperature of hot water? *

5 points

35.0 ºC

40.0 ºC

66.7 ºC

70.0 ºC

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

5 points

To transfer heat by convection

To insert the thermometer easily

To increase the conductivity of heat

To reduce loss of heat to the surrounding

6. Water is used as coolant in car engines because *

5 points

water has a low viscosity

water helps to clean the engine

water has a high specific heat capacity

water has a high specific latent heat of fusion

7. “ Water takes a shorter time to boil when heated at high lands than at low lands, although the same amount of energy is used. ” Which statement explain this observation *

5 points

the temperature is lower at high lands

the atmospheric pressure is lower at high lands

the air is less damp at high lands

the rate of heat lost is faster at high lands

8. A 800 g block of metal is heated from 28ºC to 80ºC. How much thermal energy is absorbed by the metal block if its specific heat capacity is 600 J kg-1 ºC-1? *

5 points

1.3 x 10^4 J

2.5 x 10^4 J

1.6 x 10^5 J

1.3 x 10^7 J

9. Diagram 4 shows 100 g of water at 20 ºC is poured into a beaker containing 200 g of water at 80 ºC. *

5 points

30 ºC

50 ºC

60 ºC

70 ºC

10. The phenomena of sea breeze and land breeze is due to … *

5 points

the specific heat capacity of the sea is higher than the land

specific latent heat of vaporization absorbed by the sea

the heat capacity of the air is higher than the land

the heat capacity of the air is higher than the sea

11. A block of ice is heated at a constant rate. Eventually the melted ice boils. Graph 1 shows how the temperature changes with time. How many minutes did it take to melt all the ice? *

5 points

12. A 60 W immersion heater is used to boil liquid X. After boiling for 3 minutes, 5 g of the liquid X changes to steam. Which expression determines the specific latent heat of vaporization of liquid X? *

5 points

(60 x 3) / 0.005 J kg-1

(60 x 180 x 0.005) J kg-1

0.005 / (60 x 180) J kg-1

(60 x 180) / 0.005 J kg-1

13. Diagram 5 shows the temperature-time graph for cooling substance Y. At which stage the specific latent heat of fusion is released to the surroundings? *

5 points

14. Diagram 6 shows the variation of temperature with time when a solid X is heated. What is the state of X from the time t1 to t2? *

5 points

Solid only

Liquid only

Liquid and gas

Solid and liquid

15. A solid is heated by an electrical heater. Which one of the following graph shows the solid have the large specific heat capacity and the large specific latent heat? *

5 points

16. Gas pressure in container is due to *

5 points

momentum of the gas particles

change in the momentum of the gas particles

rate of change in the momentum of the gas particles

rate of change in the momentum of the gas particles per unit area

17. Diagram 7 shows a graph of volume (V) against temperature (T) of a gas. The absolute zero can be obtained by *

5 points

finding the gradient of the graph

finding the value of intercept at V axis

finding the maximum value of V

extrapolating the straight line and find the intercept on T axis

18. - 46ºC is equivalent to *

5 points

- 46 K

46 K

273 K

227 K

19. A tyre of fixed volume containing gas of pressure 200 kPa at 30 °C. If the car travelled to certain distance, the temperature of type rises to 45 °C. Calculate the pressure of gas inside the tyre. *

5 points

190 kPa

212 kPa

209.90 kPa

320 kPa

20. A syringe contains 50 cm^3 of air at a pressure of 100 kPa. The piston is pulled outward slowly so that the air expands. What would be the volume of the air when the air pressure drops to 80 kPa? *

5 points

62.5 cm^3

52.5 cm^3

55.2 cm^3

25.5 cm^3

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