Q2. Siderosis is a disease caused by the inhalation of __________ dust.
(c) Cotton Fibers
Q3. In a water chemical treatment plant, use of chloramines ensures
(a) taste & odor control.
(c) removal of permanent hardness.
(d) weed control in reservoirs.
Q4. Turbidity of water is an indication of the presence of
(a) floating solids
(b) dissolved solids
(c) suspended inorganic matter
(d) dissolved gases
Q5. Particulates (< 1µm size) remaining suspended in air indefinitely and transported by wind currents are called
Q6. TLV (Threshold Limit Values) of mercury in potable (drinking) water is about __________ ppm.
Q7. During which of the following operating conditions of an automobile, carbon monoxide content in the exhaust gas is maximum?
(c) Idle running
Q8. Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
(a) hydrogen sulphides
(c) nitrogen dioxide
(d) hydrogen fluoride
Q9. Presence of excess fluorine in water causes
(a) respiratory disease
(b) tooth decay
(c) dental cavity
Q10. Iron & manganese present as the pollutant in water can not be removed by
(a) lime soda process or manganese zeolite process.
(b) ion exchange process.
(c) oxidation followed by settling & filtration.