(01)heat revision mc test multichoice usefull questions

Physics - Revision Test (Heat) Time allowed: 2 hours Multiple Choice Questions

1 If heat flows from a table to a block of ice moving across the table, which of the following is / are correct?

(1) There is friction between the table and the ice.

(2) The ice is cooler than the table.

(3) The ice is changing phase.

A. (1) only

B. (2) only

C. (1) and (2) only

D. (2) and (3) only

2 Which of the following materials is the best candidate to act as a coolant to cool an 80°C motor in a machine?

A. Liquid at temperature 80°C with specific heat capacity 4 200 J kg 1 °C 1

B. Liquid at temperature 80°C with specific heat capacity 5 200 J kg 1 °C 1

C. Liquid at temperature 50°C with specific heat capacity 4 000 J kg 1 °C 1

D. Liquid at temperature 50°C with specific heat capacity 3 000 J kg 1 °C 1

3 Which of the following statements is / are incorrect?

(1) Water is used as a coolant in car engines because it has a high specific heat capacity.

(2) Heat flows from cold objects to hot objects when they are put in contact. This process will stop when there

is no temperature difference between them.

(3) In coastal areas, the climate is more moderate than the interior land because of the high specific heat

capacity of the land.

A. (1) only

B. (2) only

C. (1) and (2) only

D. (2) and (3) only

4 John pours some 95°C water into a cup of instant noodles. The final temperature of the mixture is lower than

95°C. Which of the following statements is / are possible explanation(s)?

(1) The temperature of the noodles is lower than that of the hot water. Thus energy is absorbed by the

noodles.

(2) Some energy is lost to the surroundings.

(3) The mass of the mixture is larger than the total mass of the water and the noodles.

A. (1) only

B. (2) only

C. (1) and (2) only

D. (2) and (3) only

(01)Heat Revision MC Test.doc 1

5 Barbara pours some 95°C water into a cup of instant noodles. The final temperature of the mixture is 85°C. If the

masses of the hot water and noodles are 500 g and 150 g respectively, find the specific heat capacity of the

noodles. Given that the original temperature of the noodles is 25°C and the specific heat capacity of the water is

4 200 J kg 1 °C 1.

A. 500.2 J kg1 °C 1

B. 1 076.9 J kg1 °C 1

C. 2 333.3 J kg1 °C 1

D. 8 000.4 J kg1 °C 1

6 An egg is cooled in a refrigerator for a long time. Then it is taken out from the refrigerator and then put in a bowl

of 90°C hot water. Which of the following is / are correct?

(1) The egg and the hot water will be in thermal equilibrium after a long time despite the fact that the bowl is

made of metal or polystyrene.

(2) The temperature of the mixture of egg and hot water will be equal to 90°C.

(3) The temperature of the mixture of egg and hot water is depended on the material of the bowl.

A. (1) only

B. (2) only

C. (1) and (2) only

D. (2) and (3) only

7 During cloud formation, water vapor turns into water droplets. During the process, the temperature of the air in

the clouds

A. gets warmer.

B. gets cooler.

C. remains the same.

D. first gets warmer and then cooler.

8 The following map shows four cities E, F, G and H. John wants to experience an extreme temperature ranges

within a day. To which city John should go?

A. E

B. F

C. G

D. H


9 To which of the following scales does a temperature scale of 5°C to 36°C correspond?

A. From 273 K to 304 K

B. From 5 K to 36 K

C. From 278 K to 309 K

D. From 250 K to 281 K

10 Regarding to the fixed points in Celsius scale, which of the following is correct?

A. The upper fixed point is the freezing point of water and the lower fixed point is the boiling point of water.

B. The upper fixed point is the boiling point of methane and the lower fixed point is the freezing point of

methane.

C. The upper fixed point is the boiling point of water and the lower fixed point is the freezing point of water.

D. The upper fixed point is the melting point of ice and the lower fixed point is the freezing point of ice.

11 Which of the following statements is / are correct?

(1) Heat flows from hot objects to cold objects.

(2) When two objects are in thermal equilibrium, they have the same temperature.

(3) When crunched ice is added into a cup of warm water, all ice must melt immediately.

A. (1) only

B. (1) and (2) only

C. (2) and (3) only

D. (1), (2) and (3)

12 A 5 kg iron sphere of temperature 50°C is put in contact with a 1 kg copper sphere of temperature 273 K and they

are put inside an insulated box. Which of the following statements is / are correct when they reach thermal

equilibrium?

(1) The iron will have a temperature of 273 K.

(2) The copper will have a temperature of 50°C.

(3) They have the same temperature.

A. (1) only

B. (2) only

C. (3) only

D. (1), (2) and (3)

13 In thermal equilibrium, which of the following objects has the highest temperature when they are placed in a

room?

A. An iron bar

B. A piece of wood

C. A cup of water

D. They all have the same temperature.


14 When 0.5 kg water of 80°C is mixed with 0.4 kg water of 20°C, what is the final temperature of the mixture?

A. 60.5°C

B. 80.0°C

C. 53.3°C

D. 75°C

15 When 0.4 kg water of 70°C is mixed with certain amount of water of 30°C, the temperature of the final mixture is

45°C. Find the original mass of the 30°C water.

A. 0.67 kg

B. 0.52 kg

C. 0.84 kg

D. 1.01 kg

16 “Water has a specific heat capacity of 4 200 J kg–1 °C–1.” According to this statement, which of the following is

correct?

A. 0.5 kg of water needs to absorb 1 200 J energy to increase 1°C in temperature.

B. 0.5 kg of water needs to lose 4 200 J energy to the surroundings to increase 1°C in temperature.

C. 1.0 kg of water needs to lose 4 200 J energy to the surroundings to increase 1°C in temperature.

D. 1.0 kg of water needs to absorb 4 200 J energy to increase 1°C in temperature.

17 Find the energy absorbed by a copper block when the temperature of a 1.5 kg copper block increases from 298 K

to 353 K. Given that the specific heat capacity of copper is 385 J kg–1 °C–1.

A. 30 020 J

B. 31 762.5 J

C. 25 896.2 J

D. 26 645.2 J

18 Which of the following materials has the lowest specific heat capacity?

A. Ice

B. Water

C. Stone

D. Copper

19 Find the energy released by a copper block when it is cooled from 100°C to 20°C. Given that the heat capacity of

the block is 770 J °C–1.

A. 770 00 J

B. 86 050 J

C. 61 600 J

D. 50 200 J


20 If 24 062.5 J of energy is absorbed by a copper block when it is heated from 20°C to 45°C, find the mass of the

block. Given that the specific heat capacity of copper is 385 J kg–1 °C–1.

A. 1.2 kg

B. 2.5 kg

C. 3.0 kg

D. 4.4 kg


(1) The unit of heat capacity is J kg –1 °C –1.

(2) Specific heat capacity measures the temperature variations when 1 J of energy is absorbed.

(3) The unit of specific heat capacity is J kg–1 K –1.

A. (3) only

B. (1) and (2) only

C. (2) and (3) only

D. (1), (2) and (3)

22 A 60 W immersion heater is used to heat 0.3 kg of water in a beaker. The temperature of water rises from 30°C to

60°C. Given the specific heat capacity of water is 4 200 J kg−1 °C−1. How long does the heater take to heat the

water?

A. W60

C)30C(60 )C kg J 200 (4 kg) (0.3 oo1o1 −−−

B. C)30C(60 W)(60

)C kg J 200 (4 kg) (0.3oo

1o1

−

−−

C. C)30C(60

)C kg J 200 (4 kg) (0.3 W)(60oo

1o1

−

−−

D. W)(60 )C kg J 200 (4 kg) (0.3

C)30C(601o1

oo

−−

−


23 Which of the following graphs is the calibration curve for a liquid-in-glass thermometer if the liquid expands

linearly? 　 is the length of the liquid inside the tube of the thermometer and T is the temperature of the liquid.

A.

B.

C.

D.

24 Which of the following phenomena can be used to make a thermometer?

(1) The resistance of semiconductor changes with temperature.

(2) The volume of certain liquid changes linearly with temperature.

(3) When two junctions are at different temperatures, there is a voltage difference between them.

A. (1) only

B. (1) and (2) only

C. (1) and (3) only

D. (1), (2) and (3)


25 Which of the following thermometers is suitable to measure the water temperature in a fish tank?

A. A clinical thermometer

B. A thermochromic thermometer

C. A rotary thermometer

D. A freezer thermometer

26 A piece of ice is placed inside a box and is melted. Then when they reach thermal equilibrium, the ice is not

melted completely. Which of the following about their final temperatures is possible?

A. The piece of ice is at a lower temperature than the box.

B. The piece of ice is at a higher temperature than the box.

C. The box can be at −10°C.

D. The box can be at 0°C.

27 John puts some ices in his soft drink. He says that there is an exchange of internal energy between the ices and

the drink. Which of the following properties determines the direction of such exchange?

A. Specific heat capacity

B. Density

C. State of matter

D. Temperature

28 The following setup is used to find out the heat capacity of water. Which of the following actions will not help in

increasing the accuracy of the result.

A. Use a stirrer to stir the water frequently.

B. Use a polystyrene lid for the cup.

C. Use a polystyrene cup instead of the beaker to work as the container.

D. Use a water bath outside the beaker to keep the temperature constant.


29 Which of the following graphs describes the energy (E) absorbed against the change of temperature (∆T) of

water when 1 kg of water is heated from 20°C to 80°C correctly?

A.

B.

C.

D.

30 Given that the specific heat capacity of water is 4 200 J kg–1 °C–1. When 84 000 J heat is absorbed by 1 kg of

water to change its temperature (below its boiling point), which of the following is / are correct?

(1) We cannot determine the original temperature of water.

(2) We can know that the temperature of water is increased by 20°C.

(3) We can know that the temperature of water is decreased by 20°C.

A. (1) only

B. (2) only

C. (1) and (2) only

D. (1) and (3) only


31 Given that the heat capacity of certain sample is 5 000 J °C–1. Which of the following is / are correct?

(1) The mass of this sample is 1 kg.

(2) The energy needed to increase the temperature of 1 kg of this sample is 5 000 J.

(3) The energy needed to increase the temperature of 0.5 kg of this sample is 2 500 J.

(4) The temperature of this sample will increase 1°C when 5 000 J energy is absorbed by this sample.

A. (1) only

B. (4) only

C. (2) and (3) only

D. (3) and (4) only

32 Which of the following curves represents an object of the highest heat capacity? E is the energy absorbed and T

is the temperature change.

A. E

B. F

C. G

D. H

33 An immersion heater of unknown output power is used to find the specific heat capacity of a liquid. The following

graph shows the temperature against time needed in heating 1 kg of the liquid. In the same graph, the

temperature variation curve for heating 1 kg of water using the same heater is also shown. Find the specific heat

capacity of the liquid. Given that the specific heat capacity of water is 4 200 J kg–1 °C–1.

A. 6 000 J kg–1 °C–1

B. 2 050 J kg–1 °C–1

C. 334 kJ kg–1 °C–1

D. 5 080 J kg–1 °C–1


34 The following graph shows the temperature and time needed when an immersion heater of unknown output

power is used to heat 0.2 kg of water. Which of the following pairs of readings is correct when a joulemeter is

connected to the heater in the process? Given that the specific heat capacity of water is 4 200 J kg–1 °C–1.

A. Initial reading is 10 000 J and final reading is 35 000 J.

B. Initial reading is 12 000 J and final reading is 54 000 J.

C. Initial reading is 9 000 J and final reading is 13 500 J.

D. Initial reading is 8 000 J and final reading is 13 000 J.

35 When measuring the specific heat capacity of a metal block, the value of specific heat capacity founded is usually

higher than the expected value. Which of the following statements is / are the possible explanation(s)?

(1) Some energy is lost to the surroundings.

(2) More energy is absorbed by the metal block from the surroundings.

(3) The cotton wrapping the block increases the energy lost to the surroundings.

A. (1) only

B. (3) only

C. (2) and (3) only

D. (1), (2) and (3)

36 In order to make a cup of milk coffee at 78°C, 200 g of coffee is mixed up with 40 g of milk. If the original

temperature of the coffee is 80°C, find the original temperature of the milk. Assuming there is no heat lost to the

surroundings. Given that the specific heat capacity of coffee and milk are 4 000 J kg 1 °C 1 and 3 900 J kg 1 °C 1

respectively.

A. 10.26°C

B. 20.65°C

C. 45.21°C

D. 67.74°C

37 John heats a 1 kg of soup from 25°C to 70°C for 15 minutes by a heater. How long does the same heat take to

heat 1.5 kg of the same kind of soup from 20°C to 80°C? The energy output per unit time by the heater is a

constant.

A. 25 minutes

B. 45 minutes

C. 30 minutes

D. 60 minutes


38 In winter days, we wear clothes with feather inside. Which of the following explanations is / are correct?

(1) The feather can trap a layer of air inside the clothes.

(2) Air is a good insulator of heat.

(3) The feather can stop conduction.

A. (1) only

B. (3) only

C. (1) and (2) only

D. (1), (2) and (3)

39 In a warm afternoon, Amy submerges her hands in water. Heat is transferred from her skin to the water. Which of

the following is the heat transfer process?

A. Radiation B. Conduction

C. Convection D. Evaporation

40 Which of the following figures best describes the air circulation in coastal area at daytime?

A.

B.

C.

D.


41 Which of the following figures best describes the air circulation in coastal area at nighttime?

A.

B.

C.

D.

42 Which of the following ways is / are adopted in the heat exchange pipes at the back of a refrigerator?

(1) Paint the parts in black colour.

(2) Use a good conductor of heat as the pipes.

(3) Paint the parts in silvery colour.

A. (1) only

B. (1) and (2) only

C. (2) and (3) only

D. (1), (2) and (3)


43 The figure shows a radiation heater. What heat transfer processes are involved at positions E and F?

A. E is radiation and F is conduction.

B. E is conduction and F is convection.

C. E is convection and F is conduction.

D. E is radiation and F is convection.

44 John paints the surface of a flask in silvery. Which of the following explanations is correct?

A. Minimize heat transfer by radiation.

B. Minimize heat transfer by convection.

C. Maximize heat transfer by radiation.

D. Maximize heat transfer by convection.

45 Which of the following is / are correct when the object is a good absorber of radiation.

(1) The object is a good emitter of radiation.

(2) The object has a dull surface.

(3) The object has a high specific heat capacity.

A. (1) only

B. (2) only

C. (1) and (2) only

D. (2) and (3) only

46 We choose copper as the material to make cooking utensils. Which of the following explanations is / are correct?

(1) The melting point of copper is low.

(2) Copper is a good conductor of heat.

(3) Copper has a low specific heat capacity.

A. (1) only

B. (2) and (3) only

C. (1) and (3) only

D. (1), (2) and (3)


47 If an aluminium pan over an electric burner is used to cook some food, which of the following cannot increase the

rate of heat flow from the burner to the food?

A. Use a copper pan instead of the aluminium pan.

B. Increase the pan bottom area.

C. Increase the burner temperature.

D. Increase the pan bottom thickness.

48 A fibreglass insulation is installed in the outer walls of a building. Which of the following is the heat transfer

process that is intended to minimize?

A. Convection

B. Conduction

C. Radiation

D. Vaporization

49 Which of the following can help to keep a home cool in the summer the best?

A. Open the refrigerator door.

B. Turn off the television, radios and computer.

C. Open the windows during the day.

D. Close the curtains during the night.

50 On sunny days, why do hot-air balloons suddenly rise when they drift over a parking lot made of black asphalt?

A. It is windy in the parking lot.

B. The air particles in the parking lot are heated up by the sunlight reflected by the top of the cars.

C. The air particles in the parking lot are heated up by the engines of the cars.

D. The air particles in the parking lot are warmed by the black surface and are rising.

51 Which of the following electrical appliances is / are using the principle of radiation in transferring heat?

(1) Hair dryer

(2) Toaster

(3) Radiation electric heater

A. (2) only

B. (2) and (3) only

C. (1) and (3) only

D. (1), (2) and (3)

52 Which of the following is / are the explanation(s) that a cloudy night is generally warmer than a clear night?

(1) Clouds are effective absorbers of radiation to prevent the radiation from escaping to space.

(2) Clouds emit infrared radiation to the earth’s surface.

(3) A cloudy night makes the earth’s surface darker.

A. (1) only

B. (2) only

C. (1) and (2) only

D. (2) and (3) only


53 Which of the following is the least effective insulation of heat for you house?

A. Iron door

B. Wood door

C. Solid wall

D. Glass window

54 The figures show the structures of matter. Give their states.

A. A is solid, B is liquid and C is gas.

B. A is liquid, B is solid and C is gas.

C. A is gas, B is liquid and C is solid.

D. A is solid, B is gas and C is liquid.

55 When the liquid in the test tube is heated as shown, which of the following is the main process in transferring

heat?

A. Convection

B. Conduction

C. Radiation

D. None of the above

56 Which of the following materials is the best conductor of heat?

A. Air

B. Glass

C. Copper

D. Water

57 Which of the following is the process in transferring heat from the bottom to the top inside a pot of water when it is

boiling?

A. Convection

B. Conduction

C. Radiation



58 When the liquid in the test tube is heated as shown, which of the following is the main process in transferring

heat?

A. Convection

B. Conduction

C. Radiation


59 Which of the following is / are correct?

(1) Electrical conductors are usually good conductors of heat.

(2) Conductors of heat have free electrons to transmit heat quickly.

(3) Electromagnetic waves need electrons to transmit energy.

A. (1) only

B. (1) and (2) only

C. (2) and (3) only

D. (1), (2) and (3)


(1) Conduction of heat is achieved by the net movement of the ions in a conductor.

(2) Conduction of heat is achieved by the collisions of electrons and the atomic nucleus in a conductor.

(3) Conduction of heat is achieved by the convection of electrons in a conductor.

A. (1) only

B. (2) only

C. (2) and (3) only

D. (1), (2) and (3)

61 When conduction occurs in a metal, which of the following is correct?

A. The outer most shell electrons of the metal atoms do not move.

B. The outer most shell electrons of the metal atoms only move in one direction only.

C. The outer most shell electrons of the metal atoms move randomly and collisions occur.

D. The positively charged nucleus of the metal atoms move in one direction only.


62 Which of the following quantities will affect the convection in a fluid?

A. The temperature difference in the fluid

B. The number of positively charged ions in the fluid

C. The number of electrons in the fluid

D. All of the above

63 In a greenhouse, visible light enters the glass panes and is absorbed and then reradiated. What happens to this

reradiated electromagnetic radiation within the greenhouse?

A. The radiation totally returns to the atmosphere because of the difference in temperature.

B. The radiation is blocked by the glass.

C. The radiation transforms into ultraviolet upon striking the glass.

D. The radiation is reflected as visible light upon striking the glass.

64 Carbon dioxide and water molecules in the atmosphere absorb

A. visible light.

B. infrared radiation.

C. ultraviolet radiation.

D. radio wave.


65 The following flasks contain the same volume of hot water at the same temperature. They are put on a table in a

room temperature. After half an hour, which of the following flasks has the highest temperature?

A.

B.

C.

D.


66 The following flasks contain the same volume of hot water at the same temperature. They are put on a table in a

room temperature. After half an hour, which of the following flasks has the lowest temperature?

A.

B.

C.

D.


(1) Sun emits visible light only.

(2) Sun emits infrared radiation only.

(3) Human skin is an infrared radiation sensor.

A. (1) only B. (3) only

C. (1) and (3) only D. (1), (2) and (3)


68 When we use a microwave oven to heat up some food in a lunch box, we should open the lid slightly. Which of

the following explanations is / are correct?

(1) Let the microwave to go inside the lunch box.

(2) Give a way for the water vapor to go out otherwise the box will explode.

(3) Let the microwave to reflect more times inside the lunch box.

A. (1) only

B. (2) only

C. (3) only

D. (1), (2) and (3)

69 Dogs always pant in summer to release heat by

A. conduction.

B. evaporation.

C. radiation.


70 Iceberg can be found in the ocean near some hot places. Which of the following explanations is / are correct?

(1) The surrounding water and the iceberg are in thermal equilibrium.

(2) Energy from the surrounding water is not large enough to melt the iceberg.

(3) The specific heat capacity of ice is higher than that of water.

A. (1) only

B. (2) only

C. (1) and (3) only

D. (1), (2) and (3)

71 The figure shows a container that is used to hold liquid nitrogen and can be moved from one place to another.

Liquid nitrogen has a boiling point that far below the room temperature. Which of the following safety measures

should be adopted?

A. The cover of the container should be closed tightly in order to avoid heat transfer.

B. The cover of the container should not be closed tightly for the fear of explosion.

C. The cover of the container should be closed tightly because nitrogen is toxic.

D. No special measures should be adopted.



(1) Burnt by 100°C steam is more harmful than burnt by water at 100°C because energy is released by

evaporation.

(2) Burnt by 100°C steam is more harmful than burnt by water at 100°C because the energy released by

steam is larger.

(3) Burnt by 100°C steam is as harmful as burnt by water at 100°C because the energy released are the

same.

A. (1) only

B. (2) only

C. (1) and (2) only

D. (1) and (3) only

73 Water is generally used to put out fire. Which of the following explanations is / are correct?

(1) Water has a high specific heat capacity.

(2) Steam can cut off the supply of oxygen.

(4) Water is easily available.

(5) Water can react with some material.

A. (2) only

B. (4) only

C. (1), (3) and (4) only

D. (1), (2) and (3) only

74 When a drop of water is dropped into a pan of boiling oil, something is spilt out. Which of the following

explanations is / are correct?

(1) The boiling point of oil is lower than the boiling of water.

(2) The vapor of oil spills out the drop of water.

(3) The drop of water vaporizes in the pan of oil and spills out some oil.

A. (1) only

B. (3) only

C. (1) and (2) only

D. (2) and (3) only

75 Meat soup in general cools slower than hot water of the same amount and temperature. Which of the following

explanation is / are correct?

(1) The evaporation is hinder by a layer of oil on the surface of the meat soup.

(2) The heat capacity of the meat soup is much lower.

(3) The latent heat of the meat soup is higher.

A. (1) only

B. (3) only

C. (1) and (2) only

D. (2) and (3) only



(1) The total mass of the object is kept constant when fusion occurs.

(2) The internal energy of the object is increased when condensation occurs.

(3) Energy is absorbed when condensation occurs.

A. (1) only

B. (2) only

C. (3) only

D. (1), (2) and (3)

77 A piece of ice is placed inside a box. Finally a mixture of ice and water is found inside the box after a long time.

Which of the following about the final temperature of the box is correct?

A. The piece of ice is at a lower temperature than the box.

B. The box is at 0°C.

C. The box is at −1°C.

D. The box is at 1°C.

78 Which of the following processes does not involve a transfer of material?

A. Convection

B. Vaporization

C. Radiation

D. Evaporation

79 Which of the following curves describes the temperature of water variation with time when water of liquid state at

0°C vaporizes into steam correctly?

A. E

B. F

C. G

D. H


80 Which of the following statements is / are incorrect?

(1) There is no change of temperature when ice is melting.

(2) The internal energy remains unchanged when state of water change.

(3) The specific heat capacity of water in different states is a constant.

A. (1) only B. (2) and (3) only

C. (1) and (3) only D. (1), (2) and (3)

81 Latent heat is "hidden" because it

A. is stored as internal potential energy.

B. cannot be measured.

C. does not actually exist.

D. is a form of internal kinetic energy.

82 What is the energy required to melt a block of 1 kg ice at –10°C completely? Given that the specific latent heat of

fusion of ice is 334 kJ kg–1 and the specific heat capacity of ice is 2 050 J kg–1 °C–1.

A. 21 500 J

B. 33 200 J

C. 354 500 J

D. 854 000 J

83 A cube of ice of 20 g at 0°C is heated by a heater at a rate of 20 W. The ice takes 5 minutes to melt completely.

What is its specific latent heat of fusion?

A. 300 J kg-1

B. 300 000 J kg-1

C. 5 J kg-1

D. 2 J kg-1

84 If 0.5 kg of ice at –15°C is mixed with 0.5 kg of water at 80°C, will all the ice be melted down? Given that the

specific latent heat of fusion of ice is 334 kJ kg–1. Also the specific heat capacity of ice and water are 2 050 J kg–1

°C–1 and 4 200 J kg–1 °C–1 respectively.

A. No.

B. Yes and the final temperature is 5°C.

C. Yes and the final temperature is 2°C.

D. It cannot be determined.


(1) The unit of latent heat is J kg –1 °C –1.

(2) The unit of specific latent heat is J kg–1.

(3) Specific latent heat of vaporization measures the energy released if 1 kg of liquid is changed to solid state.

(4) Specific latent heat of fusion measures the energy released if 1 kg of solid is changed to gaseous state.

A. (1) only B. (2) only

C. (3) and (4) only D. (1), (2) and (3) only


86 The figure shows the heating curve of a material when it is heat by a heater. Which of the following quantities can

be determined from it? The specific heat capacity of the material in liquid state and the power of the heater are

known.

(1) The total mass of the material

(2) The energy released during condensation

(3) The energy absorbed during fusion

A. (1) only

B. (2) only

C. (3) only

D. (1), (2) and (3)

87 Under thermal equilibrium at 273 K and 1 atmospheric pressure, which of the following states of matter for water

will exist?

(1) Water

(2) Ice

(3) Steam

A. (1) only

B. (2) only

C. (1) and (2) only

D. (2) and (3) only

88 Water molecules change their states between the liquid and gaseous states

A. only when water vapor is saturated.

B. at all times because evaporation and condensation occur in any time.

C. only when the vapor molecules produces a pressure as the same as the atmospheric pressure.

D. only when the water is boiling.


89 Which of the following parts of the heating curve contains liquid?

A. AC

B. BD

C. CE

D. BE

90 The figure shows the heating curve for 0.5 kg of ice at 0°C heated by an immersion heater. Given that the specific

latent heat of fusion of ice is 334 kJ kg–1. Find the power of the heater.

A. 200 W

B. 60 W

C. 150 W

D. 100 W

91 An immersion heater can increase the temperature of 2 kg water 60°C in 100 minutes. How long does it take to

melt a block of 0.5 kg ice at 0°C? Given that the specific latent heat of fusion of ice is 334 kJ kg–1. Also the

specific heat capacity of water is 4 200 J kg–1 °C–1.

A. 33.13 minutes

B. 40.25 minutes

C. 60.63 minutes

D. 100 minutes


92 Which of the following actions does not help in increasing the accuracy of the experiment to find the specific

latent heat of fusion of ice?

A. Use crushed ice.

B. Use a control set.

C. Use a polystyrene cup instead of the beaker as the container.

D. Use ice of lower temperature initially.

93 An immersion heater is used to find the specific latent heat of fusion of a solid material A. The graph shows the

temperature of material A against time when 1 kg of material A is heated. In the same graph, the curve for 1 kg of

ice at 0°C heating by the same heater is also shown. Find the specific latent heat of fusion of material A. Given

that the specific latent heat of fusion of ice is 334 kJ kg–1.

A. 330 kJ kg–1

B. 214 kJ kg–1

C. 570 kJ kg–1

D. 680 kJ kg–1

94 If 500 000 J of energy is absorbed by a block of ice when it is heated from −5°C to 0°C, find the mass of the ice.

Given that the specific heat capacity of ice is 2 050 J kg–1 °C–1 and the specific latent heat of fusion of ice is 334

kJ kg–1.

A. 1.45 kg

B. 2.56 kg

C. 3.01 kg

D. 3.27 kg

95 In order to make a cup of tea at 12°C, 200 g of tea is mixed up with some ice. The original temperature of the tea

and ice are 80°C and 0°C respectively. Find the mass of the ice needed. Assuming there is no heat lost to the

surroundings and given that the specific heat capacity of tea and water are 3 800 J kg 1 °C 1 and 4 200 J kg 1 °C 1

respectively. The specific latent heat of fusion of ice is 334 kJ kg 1.

A. 134 g

B. 123 g

C. 95 g

D. 80 g


96 Which of the following actions does not help in increasing the accuracy of the experiment to find the specific

latent heat of vaporization of water?

A. Use an electronic balance.

B. Use a polystyrene lid for the cup.

C. Use a polystyrene cup instead of the beaker as the container.

D. Use a stirrer.

97 Given that the specific latent heat of fusion of a sample is 550 kJ kg–1. Which of the following is / are correct?

(1) The mass of this sample is 1 kg.

(2) The energy needed to increase the temperature of 1 kg of this sample in solid state through 1°C is 550 kJ.

(3) The energy needed to increase the temperature of 1 kg of this sample in liquid state through 1°C is 550 kJ.

(4) The energy needed to change 1 kg of material from solid state to liquid state is 550 kJ.

A. (1) only

B. (4) only

C. (2) and (3) only

D. (1), (2), (3) and (4)

98 Find the energy released by 0.3 kg of a liquid sample at 200°C to change to its solid state at 50°C. Given that the

specific heat capacity of the sample in solid state and liquid state are 770 J kg–1 °C–1 and 900 J kg–1 °C–1

respectively. The melting point of the sample is 100°C and the specific latent heat of fusion of it is 10 000 J kg–1.

A. 41 550 J

B. 21 000 J

C. 8 860 J

D. 6 170 J

End


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