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A. True or False
1. Solid particles are closely packed and cannot move at all.
2. All filters are made of filter paper.

B.MC
1. John poured some hot water into a new glass. The glass broke into pieces immediately because _________________.
  A. the hot water had a large amount of heat energy
  B. the hot water expanded in the glass and pushed the wall of the glass
  C. the inside of the glass expanded faster than the outside
  D. the glass was not designed for hot water

2. A metal rod is heated strongly and its length is 30 cm. After it is cooled down, its length is likely to be_________.
  A.20 cm
  B.29 cm
  C.30 cm
  D.31 cm

3. Which of the following does NOT involve the change of states of matter?
  A. Clothes dry up very quickly on a sunny day.
  B. Dews form on leaves in the morning
  C. Ice form in the refrigerator.
  D. A basketball is pumped up

4. Which of the following make(s) use the change of air pressure?
   (I) Pumping up the tyres of a car
   (II) Blowing a balloon
   (III) Cleaning floor with a vacuum cleaner
A.  (I) and (II) only
B.  (I) and (III) only
C.  (II) and (III) only
D.  (I), (II) and (III)

5. Which of the following are energy converters?
(1) Motor
(2) Car
(3) Light bulb
A. (1) and (2) only
B. (1) and (3) only
C. (2) and (3) only
D. (1), (2) and (3)

[ 本帖最後由 cHoi_vy 於 2007-6-24 09:29 PM 編輯 ]

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