11. This is the condition of air that is contaminated brought by smoke and fumes emitted by vehicles,
power plants and factories,
a. Water pollution
c. Pollution
b. Land pollution
d. Air pollution
12. A pupil reaches one hand into a bag filled with smooth objects. The pupil feels the objects but does
not look into the bag. Which property of the objects can the pupil most likely identify?
a. ability to conduct electricity
c. color
b. ability to reflect light
d shape
13. A pupil has a ball of clay that sinks when placed in a pail of water. Which property should he or she
change to make the clay float?
a. color
b. shape
d. texture
c. mass
14. Property of matter that is defined as the ability to shine by reflecting light.
a. luster
c. malleability
b. color
d solubility
15. Which is an example of physical change?
a. water freezes to ice
c. Naphthalene balls turn to vapour
b. Wood turns to alcohol
d. Both a and b​