II. Write the letter of the best correct answer on the space before the number.

___ 1.) Which type of mixture that you cannot identify the individual ingredients that you combined and the resulting mixtures looked the same throughout?
a. heterogeneous
b. solid mixture
c. homogeneous
d. mixed materials

___ 2.) Which material will undergo decay?
a. empty can
b. broken glass.
c. flower petals
d. plastic bag

___ 3.) If you're going to dispose waste materials commonly found at home, what are you going to do with decaying materials?
a. make a compost
b. throw them in the river
c. mix them the non-decaying
d. keep them in the cabinet and use them again.

___ 6.) Which the following show proper waste disposal.
a.
b.
c.
d.

___ 4.) _____ of materials happens when temperature decreases.
a. melting
b. heating
c. cooling
d. boiling

___ 5.) When melted butter is cooled, it's temperature ______.
a. increases
b. decreases
c. remains the same
d. boiling

___ 6.) Which of the following show proper waste disposal?
a. throwing garbage to the sea
b. putting all waste materials in one container
c. throwing left-over food in the drainage canal
d. segregating waste into decaying wastes be disposed

___ 7.) how should non-decaying wastes be disposed?
a. by composting
b. reusing
c. by recycling
d. both b and c

___ 8.) Which activity caused change that has useful effect in the environment?
a. sewing fabric to make clothes
b. cutting of trees
c. using eco bag
d. burning of tires

9.) Which of the following changes is NOT harmful to the environment?
a. sewing fabric to make clothes
b. deforestation
c. burning old trees
d. dumping garbage into the bodies lf water.

___ 10.) The contaminated water can caused diarrhea and other ailments. what kind of pollution is this?
a. air pollution
b. water pollution
c. land pollution
d. b and c

​