the letter of the correct answer.
1. These are materials that absorb water and can easily undergo decay because of the pre
of water or moist that can cause degradation of materials due to presence of microorganism.
a. Porosity b. porous
c. non-porous d. evaporation
2. These are materials that do not absorb water or liquid because they don't have holes or
between their particles.
a. Porous
b. non-porous
C. condensation d. liquidation
3. What properties of materials are common among coins, spoon, and iron?
1. Non-porous
III. Porous
II. Denser than water
IV. Less dense that water
a. I and II b. I and IV
c. III and IV
d. I only
4. Which materials will most likely undergo decay?
a. Aluminum b. left over foods
C. water
d. plastic cups
5. How do plants helps reduce air pollution?
a. They absorb carbon dioxide in the air c. they provide shade
b. They cool the surrounding air
d. they filter the air
6. How can you properly dispose garbage that can easily decompose?
a. Recycle them b. bury them c. burn them
d. sell them
7. What is the best way to prevent land pollution?
a. Put garbage in garbage pits
c. damp garbage in the street corner
b. Throw garbage into a creek or river d. burn them
8. Which statement are the effects of polluted land, water and air?
a. Polluted air can make your eyes itchy c. polluted water can make you sick
b. Polluted land is harmful
d. polluted water increase the number of fish
9. It is the measurement of the amount of heat energy present on the surroundings
a. Thermometer
b. temperature
c. heat d. matter
10. Air can be polluted by the smoke coming from
a. Motor vehicle
b. boiling food C. nebulize d. water
Tell whether the followin​