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In your jotter write the DATE in the margin.
Now add a TITLE for your homework.
Your title should be the name of the Homework: Matter Homework Wk 4 |
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Question 1.
A girl puts her finger on the end of a syringe and pushes the plunger.
The molecules in the air inside the syringe
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A. |
get bigger |
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B. |
get smaller |
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C. |
move further apart |
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D. |
move closer together |
Question 2.
The two syringes in the diagram below are sealed, and then the plungers are squeezed. Plunger X moves in more than plunger Y, because
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A. |
gas molecules are bigger than water molecules |
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B. |
water molecules are bigger than gas molecules |
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C. |
gas molecules are further apart than water molecules |
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D. |
water molecules are further apart than gas molecules |
Question 3.
Molecules in a liquid move
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A. |
faster than in a gas |
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B. |
faster than in a solid |
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C. |
just as fast as in a gas |
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D. |
just as fast as in asolid |
Question 5.
The syringe below is filled with cold air, and sealed. The length of X is 20mm. The syringe is dropped into boiling water. What could the length of X be now?
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A. |
9 mm |
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B. |
15 mm |
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C. |
19 mm |
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D. |
25 mm |
Question 6.
When a metal expands its atoms
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A. |
get smaller |
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B. |
move more slowly |
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C. |
move further apart |
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D. |
move closer together |
Question 7.
A bimetallic strip bends when heated because
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A. |
the gas pushes it up |
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every metal bends when heated |
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C. |
one metal expands and the other contracts |
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D. |
one metal expands more than the other |
Question 8.
Look at the drawing below of a fire alarm. What is X?
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A. |
copper rod |
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B. |
thermometer |
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C. |
bimetallic strip |
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D. |
slicon chip |
Question 9.
A blacksmith makes an iron tyre for a train wheel. The iron tyre is just too small to fit over the wheel. To make it fit over the wheel, the blacksmith
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A. |
heats the tyre |
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B. |
cools the tyre |
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C. |
heats the wheel |
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D. |
spins the wheel |
Question 10.
Strips of copper and steel are joined together in the arrangements shown below. Copper expands more than steel. Which of the following will bend up when heated?
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D. |
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Question 11.
These bottles are full of air and are balanced on a nail. More air is then pumped into bottle X with a bicycle pump. Which drawing shows what happens?
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D. |
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Question 12.
Examine the drawing below of a copper rod, which is 75.00mm long. The rod is heated strongly. How long could the rod now be?
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A. |
74.00mm |
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B. |
74.80mm |
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C. |
75.00mm |
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D. |
76.00mm |
Question 13.
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When all the air is sucked from an oil can, the can is crushed because |
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the air pressure outside is greater than that inside |
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the air pressure inside is greater than that outside |
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the heat has weakened the metal of the drum |
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the ice has fractured the metal |
Question 14.
Examine the diagrams which follow.
Describe the applications of expansion and contraction in the situations shown.
Question 15.
1. Imran and James were drinking full cartons of juice on a hot, sunny day. While they were holding them they noticed that the juice began to squirt out of the straw. Imran said, “The juice is expanding inside the pouch and that’s why it is leaking out.”
a) Why does the juice expand?
b) How could they stop the juice from expanding?
c) What is happening to the particles of juice as they expand?
