Inhalation of silica dust causes a disease called__________________?

A. Air binding
B. Shrinkage of filtering media
C. Mud balls
D. Expansion of filtering media

A. SO2 & SO3
B. NO2
C. NH3
D. CO

A. Cancer
B. Asthma
C. Silicosis
D. Fluorosis (bone disease)

A. 1
B. 3
C. 7
D. 20

A. 1
B. 25
C. 150
D. 650

A. Mercury
B. Arsenic
C. Aluminium
D. Lead