1.
The best way to distinguish an oil fire is to: a. use
a soda acid extinguisher; b. pour water on the fire;
c. cover fire with oxygen; d. cover fire with something
that will not burn.
2. An electromagnet is used in
a: a. faucet; b. telephone; c. flashlight; d. door check.
3. An example of evaporation
is: a. snow falling; b. wood burning; c. water freezing;
d. clothes drying.
4. When baking powder reacts
with water in a cake batter, the gas produced is: a.
nitrogen oxide; b. tartaric acid; c. oxygen; d. carbon
dioxide.
5. Sound will travel best through:
a. air; b. metal; c. water; d. a vacuum.
6. Which of these does not belong
with the others; a. steel; b. lead; c. oxygen; d. hydrogen.
7. When rubbers are worn in the
classroom, they often make the feet feel too warm because
rubber: a. is a good insulator; b. is a good heat conductor;
c. is warmer than leather; d. keeps cold out.
8. In the carburetor of a car,
gasoline is mixed with: a. oil; b. water; c. electricity;
d. air.
9. Which chemicals could be used
to make a model fire extinguisher? a. salt and ammonia;
b. iron and alcohol; c. alcohol and bicarbonate of soda;
d. vinegar and baking soda.
10. The process of changing a
gas to liquid is called: a. evaporation; b. dehydration;
c. condensation; d. distillation. |