SPM 2009 question 4

Diagram 4 shows air bubbles produced by an air pump in an aquarium filled with fresh water.

Diagram 4

(a) Explain why the volume of an air bubble increases as it moves towards the surface.

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.........................................................................................................................................[ 2 marks ]

(b) Name the physics law involved.

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(c) What is the change in the volume of an air bubble at level R when the fresh water is replaced by sea water of higher density?

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(d) An air bubble of volume 5 cm3 is released by an air pump at depth of 0.5 m. Calculate the volume of the air bubble when it reaches the surface of the water.[ Assume that the atmospheric pressure is 10 m water ]

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SPM 2010

Question 5

Diagram 5.1 (a) shows a ramp from position X.Diagram 5.1 (b) shows the velocity- time graph of the boy from X to Z.

Diagram 5.2 (a) shows the same boy skating down from position Y by using another ramp.Diagram 5.2 (b) shows the velocity-time graph of the boy from Y to Z.

Both ramp are the same slope and surface.

(a) Name the physical quantity represented by the gradient of the velocity-time graph.

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(b) Observe diagram 5.1(a) and diagram 5.2 (a)

(i) Compare the gravitational potential energy of the boy at X and Y.

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(ii) Compare the velocity of the boy at Z in these two situations.

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(iii) Compare the kinetic energy of the boy at Z in these two situations.

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(c) Based on the answer 5 (b)

(i) State the relationship between the gravitational potential energy and the kinetic energy of the boy

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(ii) State the physical concept involved.

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[ 1 mark ](d) (i) Based on diagram 5.1 (a), what happens to the velocity of the boy when he skates from Z

to Q ?

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(ii) Give one reason for your answer in 5(d)(i)

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SPM 2010 Question 8

Table 8 shows two types of pot and their characteristics.

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(a) What is the meaning of specific heat capacity?

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(b) Based on table 8, state suitable characteristic of the pot if it is used for cooking something rapidly.Give reason for the suitability of the characteristics.(i) Material for making the pot

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Reason

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(ii) Material for making the handle of the pot

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Reason

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(iii) Mass of the pot

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Reason

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(c) The pot are heated by using an electric hot plate of power 800 W.Based on the information in table 8 , calculate the time to achieve a temperature rise of 900 for :(i) The clay pot

[ 2 marks ](ii) The copper plate

[ 2 marks ]

(d) Determine the most suitable pot that is the safest to handle and can be heated in the shortest period of time.

.....................................................................................................................................................[ 1 mark ]

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