Form 2 Science

Chapter 6

FORM 2 CHAPTER 6
AIR PRESSURE

1. Diagram 1(a) shows a container filled with air.

Container Air particle

Diagram 1 (a)
(a) (i) What happens to the air pressure in the container when the piston is pushed
downwards?

…………………………………………………………………………………………………….

[1 mark]

(ii) Explain your answer.

……………………………………………………………………………………………………..

…………………………………………………………………………………………………….

[1 mark]

(b) Draw the arrangement of air particles in the container after the piston is pushed
downwards in Diagram 1.2.
Downwards

Container P

Diagram 1.2

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 Form 2 Science
Chapter 6

[1 mark]
(c) Diagram 1.2 shows a gas cylinder.

Diagram 1.2

(i) In what state of matter is the gas stored in the gas cylinder?

…………………………………………………………………………………………………..

[1 mark]

(ii) Explain what happens to the gas particles when the gas is released from the gas
cylinder.

…………………………………………………………………………………………………..

[1 mark]

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 Form 2 Science
Chapter 6

2. Diagram 2 shows a suction pump.

X
Y

Diagram 2

(a) What is the function of a suction pump?

……………………………………………………………………………………………………….

[1 mark]

(b) What happens when the suction pump is pushed onto the surface of sink as shown in
Diagram 2?

……………………………………………………………………………………………………….

[2 marks]

(c) What makes the suction pump to be attached firmly onto the surface of the sink?
………………………………………………………………………………………………………
………………………………………………………………………………………………………
[1 mark]

(d) What happens to the pressure in X and Y when the pump is pulled upwards again?

……………………………………………………………………………………………………….

……………………………………………………………………………………………………….

[1 mark]

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 Form 2 Science
Chapter 6

3. Diagram 3.1 shows a pen being filled with ink.

W
piston

Z ink

Diagram 3.1

(a) What can be observed when the piston is pulled upwards?

…………………………………………………………………………………………………….

[1 mark]

(b) When the piston is pulled upwards, which point, W, X, Y or Z has

(i) the lowest air pressure:

……………………………………………………………………………………………………

(ii) the highest air pressure:

…………………………………………………………………………………………………….

[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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 Form 2 Science
Chapter 6

cardboard

water

(a) (b)

Diagram 3.2

(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)?

………………………………………………………………………………………………….

[1 mark]

(ii) Explain your observation in (c)(i).

………………………………………………………………………………………………….

…………………………………………………………………………………………………..

[2 marks]

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 Form 2 Science
Chapter 6

4. Diagram 4.1 shows a plastic bottle attached to a suction pump.

To suction pump

Plastic bottle

Air

Diagram 4.1

(a) (i) What happens to the bottle when air is drawn out of the bottle?
……………………………………………………………………………………………
……

[1 mark]

(ii) Explain your observation in (a)(i).

…………………………………………………………………………………………………

…………………………………………………………………………………………………

[2 marks]

(b) Diagram 4.2 shows a balloon in glass bottle connected to a suction pump.

To suction pump

Glass bottle
Air

Balloon

Diagram 4.2

(i) What happens to the balloon when air is drawn out of the glass bottle?

…………………………………………………………………………………………………

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 Form 2 Science
Chapter 6

[1 mark]
(ii) Explain your observation in (b)(i).

…………………………………………………………………………………………………

…………………………………………………………………………………………………

[2 marks]

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 Form 2 Science
Chapter 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
.

Diagram 5.1(a) Diagram 5.1(b)

(a) What causes the box to collapse as shown in Diagram 5.1(a)?

………………………………………………………………………………………………………
[1 mark]
(b) (i) What should the boy do to regain the shape of the box?
….………………………………………………………………………………………………
[1 mark]
(ii) Explain your answer in (b)(i).
……………………………………………………………………………………………………

……………………………………………………………………………………………………

[2 marks]

(c) Diagram 5.2 shows how medicine is being drawn into a syringe.

Diagram 5.2

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 Form 2 Science
Chapter 6

(i) What can be observed when the piston is pulled upwards?

……………………………………………………………………………………………………

[1 mark]

(ii) What happens to the volume of air in the syringe when the piston is pulled upwards?

…………………………………………………………………………………………………….

[1 mark]

(iii) How does this affect the air pressure in the syringe?

…………………………………………………………………………………………………….

[1 mark]

(iv) What pushes the medicine into the syringe?

…………………………………………………………………………………………………….

[1 mark]

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