Olp Igcse Heat & Electromagnetism Ct 5 - Jan 2012

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MESH INTERNATIONAL – CT5: MECHANICS & HEAT (OLP IGCSE)

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1. A substance is heated in an enclosed space until it becomes a gas.

After the heater is removed, the temperature is recorded at regular intervals. The graph shows temperature

plotted against time.

What does the section PQ represent?

A boiling

B condensing

C meltingD solidifying

2. A student is given a thermometer that reads 1 °C in pure melting ice and 101 °C in pure boiling water. She

uses it to measure the temperature of some water before and after it is heated.

The increase in temperature of the water calculated from her results is

A 1 °C too low.

B correct.

C 1 °C too high.

D 2 °C too high.




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3. Fiber is used for home insulation in a cold country, as shown in the diagram.

Heat cannot easily escape through the ceiling because the fibre

A traps air. B is warm. C is tightly packed. D heats the roof space.

4. The diagram shows four similar cans. Each can contains the same volume of water initially at 80 °C. After

five minutes, which can will contain the coolest water?

5. A new liquid is tested to decide whether it is suitable for use in a liquid-in-glass thermometer. It is found

that the liquid does not expand uniformly with temperature.

What will be the effect of this on the scale of the thermometer?

A It has a short range.

B It is not linear.

C The markings are too close together.

D The markings are too far apart.

6. The fillings for a hole in a tooth should be made from a material that

A expands more than the hole in the tooth.

B expands by the same amount as the hole in the tooth.

C expands less than the hole in the tooth.

D does not expand when heated.




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7. Heat energy is supplied at the same rate to 100 g of paraffin and to 100 g of water in similar containers.

Why does the temperature of the paraffin rise more quickly?

A The paraffin has a larger specific heat capacity than water.

B The paraffin has a smaller specific heat capacity than water.C The paraffin is less dense than water.

D The paraffin is more dense than water.

8. A teacher has a large tank of water in which he wants to set up a convection current.

Which of the following arrangements would do this?

A cooling at X B cooling at Y C heating at Y D heating at Z

9. The sensitivity of a liquid-in-glass thermometer depends on the volume of liquid used and the diameter o

the bore of the thermometer.

Which changes will produce the greatest increase in sensitivity?

10. The energy required to change liquid water into water vapour at the same temperature is called latent

heat of vaporisation.

What does this energy do?

A increases the average separation of the water molecules

B increases the average speed of the water molecules

C raises the temperature of the air near the water

D splits the water molecules into their separate atoms




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11. The heat from the hot water in a metal radiator passes through the metal and then spreads around the

room.

What are the main processes by which the heat is transferred through the radiator and then spread around

the room?

12. An airtight container holds a fixed quantity of gas. Its pressure and volume are measured on four occasi

when the temperature is 20 °C. The results are shown in the table.

Which set of readings is incorrect?

13. In a vacuum flask, which methods of heat transfer are prevented by the vacuum?

A conduction only

B convection only

C conduction and convection only

D conduction, convection, and radiation

14. Some air is trapped inside a small balloon. The average kinetic energy of the air molecules in the balloon

increased.

What remains the same?

A the density of the air in the balloon

B the mass of the air in the balloon

C the temperature of the air in the balloon

D the volume of the air in the balloon




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15. At regular intervals along a railway line there is a gap between the rail sections.

What is the reason for the gap between the rail sections?

A to allow for expansion of the rail sections during hot weather

B to allow for vibrations of the rail sections as the train passes over them

C to allow rain water to drain from the rail sections

D to keep the wheels of the train and carriages on the rail sections

16. Ice is taken from a freezer and left in a room. The ice melts and eventually the water reaches room

temperature.

Which energy transfers take place?

17. A student is investigating the evaporation of water.

The student can change:

the depth of the water;the surface area of the water;

the temperature of the water.

How many of these changes, if any, would alter the rate at which evaporation occurs?

A 0 B 1 C 2 D 3




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18. The gas in a container is heated but is kept at constant volume.

Why does the gas pressure increase?

A The molecules expand.

B The molecules increase in mass.

C The molecules move further apart.D The molecules move more rapidly.

19. The table lists the melting points and the boiling points of four different substances A, B, C and D.

Which substance is a gas at 25 °C?

20. The diagram shows four blocks of steel. The same quantity of heat is given to each block.

Which block shows the greatest rise in temperature?

21. A wooden wheel can be strengthened by putting a tight circle of iron around it.

Which action would make it easier to fit the circle over the wood?

A cooling the iron circle

B heating the iron circle

C heating the wooden wheel

D heating the wooden wheel and cooling the iron circle




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22. Which statement refers to convection?

A It does not involve energy transfer.

B It is the transfer of heat energy without the movement of particles.

C It only occurs in liquids or gases.

D It only occurs in solids.

23. Spoons made of different materials were placed in four cups of coffee poured from the same jug.

Which spoon will be hottest to touch at end X?

24. A person cannot unscrew the lid of a pot of jam. He finds that the lid can be unscrewed after it has been

held under hot, running water for a few seconds.

25. A substance consists of particles that are close together and moving past each other at random.

The average speed of the particles is gradually increasing.

What best describes the substance?

A a gas being heated

B a liquid being heated

C a solid being heated

D a solid being melted

Why is this?

A The air pressure in the jar falls.

B The glass expands.C The jam melts.

D The lid expands.




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26. The diagram shows a thick copper plate that is very hot. One side is black, the other is shiny.

A student places her hands the same distance from each side as shown.

Her left hand feels warmer than her right hand.

Which statement is the correct conclusion from the experiment?

A The black side is hotter than the shiny one.

B The black side radiates more heat.

C The shiny side radiates more heat.

D The shiny side is cooling down faster than the black side.

27. Some ice cubes are taken from a deep-freeze and placed in a metal container. The container is heated a

constant rate and readings of temperature and time are taken. The results are recorded on a graph.

Which temperature corresponds to 0 °C?

28. The diagrams show a bimetallic strip when it is at room temperature and after it has been cooled.

The change in shape occurs because

A brass contracts more than invar.

B brass expands when it cools down.

C invar and brass contract by equal amounts.

D invar contracts more than brass.




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29. A permanent magnet can be demagnetised by using a solenoid and switching the current on then off.

Which diagram shows the most effective method of producing demagnetisation?

30. Four processes are used to charge an isolated metal sphere.

P The sphere is earthed by touching it.Q The earth connection is removed from the sphere.

R A charged rod is brought close to the sphere.

S The charged rod is removed.

In which order should these processes be carried out to charge the sphere?

first last

A P Q R S

B P R S Q

C R P Q S

D R S P Q




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31. Two insulated metal spheres X and Y are initially in contact. While a positively charged rod is near

X the spheres are moved apart. After this action X has a negative charge.

The charge on Y will be

A negative and smaller than that on X.

B negative and the same size as that on X.

C positive and smaller than that on X.

D positive and the same size as that on X.

32. Which combination of identical resistors gives the lowest total resistance?

33. A house-owner replaced a failed fuse for the lights of the house. When the lights were switched on, the

new fuse also failed. The house-owner then used another fuse with a higher rating than the previous two.

Why was this not a sensible thing to do?

A Fuses allow the circuit to work only if the rating is exactly right.

BThe fuse has already melted because the rating was too high.C Using a fuse with too high a rating would cause electric shocks.

D A fuse with a higher rating might allow the circuit to work, but the fault would not be corrected.




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34. A bar magnet is broken into three parts X, Y and Z.

Which diagram shows the poles in X, Y and Z?

35. In the circuit shown, at which point is the current the smallest?

36. Two resistors of 6 Ω and 12 Ω are arranged in parallel. A p.d. is connected across the terminals X and Y. T

current through the 6 Ω resistor is 4 A.

What is the current in the ammeter?

A 4A B 6A C 8A D 12A




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37. In which circuit will a lamp glow more brightly when less light shines on a light-dependent resistor?

38. A current in a solenoid creates a magnetic field.

What is the effect on the magnetic field at the point P of using a larger current in the opposite direction?




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39. A metal ring screens a piece of equipment from a magnetic field.

Which metal should be used for the ring, and why?

40. Two insulated and uncharged metal spheres X and Y are touching. While a positively charged rod is near

the spheres are moved apart. After this action, X has a negative charge.

What will be the charge on Y?

A negative and smaller than that on X

B negative and the same size as that on X

C positive and smaller than that on X

D positive and the same size as that on X

41. A wire has a resistance of 8 Ω. A second wire, made of the same material, has half the length and twice t

cross-sectional area.

What is the resistance of the second wire?

A 1Ω B 2Ω C 8Ω D 16Ω




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TOTAL FOR THIS PAPER: 90 MARKS

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Olp Igcse Heat & Electromagnetism Ct 5 - Jan 2012