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Form 2 ScienceChapter 6
FORM 2 CHAPTER 6 AIR PRESSURE
1. Diagram 1(a) shows a container filled with air.
(a)(i) What happens to the air pressure in the container when the piston is pushed downwards?
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[1 mark]
(ii) Explain your answer.
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[1 mark]
(b) Draw the arrangement of air particles in the container after the piston is pushed downwards in Diagram 1.2.
[1 mark]
JPN Pahang 200997
Container P
Diagram 1.2
Downwards
Container
Diagram 1 (a)
Air particle
Form 2 ScienceChapter 6
(c) Diagram 1.2 shows a gas cylinder.
(i) In what state of matter is the gas stored in the gas cylinder?
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[1 mark]
(ii) Explain what happens to the gas particles when the gas is released from the gas cylinder.
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[1 mark]
JPN Pahang 200998
Diagram 1.2
Form 2 ScienceChapter 6
2. Diagram 2 shows a suction pump.
(a) What is the function of a suction pump?
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[1 mark]
(b) What happens when the suction pump is pushed onto the surface of sink as shown in Diagram 2?
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[2 marks]
(c) What makes the suction pump to be attached firmly onto the surface of the sink?
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[1 mark]
(d) What happens to the pressure in X and Y when the pump is pulled upwards again?
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[1 mark]
JPN Pahang 200999
Diagram 2
X
Y
Form 2 ScienceChapter 6
3. Diagram 3.1 shows a pen being filled with ink.
(a) What can be observed when the piston is pulled upwards?
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[1 mark]
(b) When the piston is pulled upwards, which point, W, X, Y or Z has
(i) the lowest air pressure:
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(ii) the highest air pressure:
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[2 marks]
(c) Give one example of an appliance which works using the same principle as shown in Diagram 3.1. ……………………………………………………………………………………………………….
[1 mark]
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piston
inkZ
W
Diagram 3.1
Form 2 ScienceChapter 6
(d) (i) A glass filled with water is covered with a piece of cardboard as shown in Diagram 3..2(a). What can be observed when the glass is inverted as shown in Diagram 3.2(b)?
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[1 mark]
(ii) Explain your observation in (c)(i).
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[2 marks]
JPN Pahang 2009101
cardboard
water
Diagram 3.2
(a) (b)
Form 2 ScienceChapter 6
4. Diagram 4.1 shows a plastic bottle attached to a suction pump.
(a) (i) What happens to the bottle when air is drawn out of the bottle?
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[1 mark]
(ii) Explain your observation in (a)(i).
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[2 marks]
(b) Diagram 4.2 shows a balloon in glass bottle connected to a suction pump.
(i) What happens to the balloon when air is drawn out of the glass bottle?
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[1 mark]
JPN Pahang 2009102
To suction pump
Plastic bottle
Air
Diagram 4.1
To suction pump
Glass bottle
Air
Diagram 4.2
Balloon
Form 2 ScienceChapter 6
(ii) Explain your observation in (b)(i).
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[2 marks]
JPN Pahang 2009103
Form 2 ScienceChapter 6
5. Diagram 5.1 (a) shows a boy using a straw to drink from a packet drink. Diagram 5.1 (b) shows the condition of the box after he finished drinking
.
(a) What causes the box to collapse as shown in Diagram 5.1(a)?
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[1 mark]
(b) (i) What should the boy do to regain the shape of the box?
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[1 mark]
(ii) Explain your answer in (b)(i).
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[2 marks]
(c) Diagram 5.2 shows how medicine is being drawn into a syringe.
(i) What can be observed when the piston is pulled upwards?
JPN Pahang 2009104
Diagram 5.2
Diagram 5.1(a) Diagram 5.1(b)
Form 2 ScienceChapter 6
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[1 mark]
(ii) What happens to the volume of air in the syringe when the piston is pulled upwards?
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[1 mark]
(iii) How does this affect the air pressure in the syringe?
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[1 mark]
(iv) What pushes the medicine into the syringe?
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[1 mark]
JPN Pahang 2009105
