Physics Half-Yearly Examination Worksheets - Kullegg Maria Regina, Boys' Secondary Mosta Page 3
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102. This question is about pressure in gases.
a) A plastic bottle filled with air is connected to a vacuum pump as shown.
plastic bottle
filled with air
vacuum pump
Underline the correct answer.
(i) Before switching on the vacuum pump:
the air particles inside the bottle exert a pressure by (colliding with, sticking to) the
inside walls of the bottle.
[1]
the pressure inside and that outside the bottle are (different, equal).
[1]
(ii) After switching on the vacuum pump:
the number of air particles inside the bottle (decreases, increases).
[1]
the pressure inside the bottle (decreases, increases).
[1]
the plastic bottle (keeps its shape, is crushed).
[1]
b) A ball is inflated using a foot pump as shown in the diagram below. State whether
each of the following quantities decreases, increases or remains the same.
ball
foot pump
(i) The volume of air inside the ball.
___________________________________________________________________________
[1]
(ii) The number of air particles inside the ball.
[1]
___________________________________________________________________________
(iii) The air pressure inside the ball.
[1]
___________________________________________________________________________
Page 3 of 10
Physics Half yearly exam 2015 – Track 3 - Form 3
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