Physics Sec Sample Paper I Worksheet - University Of Malta, 2012 Page 3
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112.(a)
Scientists believe that everything is made up of particles. These particles are
arranged in different ways in solids, liquids and gases. Fill in the table below
by writing the state which best describes the state of the particles.
Description of Particles
State of Matter
Large spaces between particles
Gas
Particles vibrate about a fixed position
Particles move at random at high speed
Strong forces of attraction between particles
Particles are held together but not strongly
(4)
(b)
Diagram 2 shows a sealed container connected to a vacuum
pump. Martha pumps some of the air out of the sealed
to vacuum
container. What will happen to:
pump
(i)
the mass of the air inside the container?
______________________________________________________
(1)
(ii)
the density of the air inside the contain?
______________________________________________________
(1)
Diagram 2
(iii)
the velocity of the air molecules inside the container?
_____________________________________________________________________
(1)
(iv)
the number of collisions on the inside of the container?
_____________________________________________________________________
(1)
(c)
Martha is a curious girl and she wants to try something else. She puts a sealed
balloon that has air inside it on the bottom of the container as shown in
Diagram 3. She then pumps some air out of the container. What will happen
to:
to vacuum
(i)
the pressure of the air inside the container?
pump
_____________________________________________________
(1)
(ii)
the balloon?
_____________________________________________________
balloon
(1)
Diagram 3
Page 3 of 11
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