Q1. Tolerable limit of nitrogen oxides in air is __________ ppm.
Q2. Siderosis is a disease caused by the inhalation of __________ dust.
Q3. In water chemical treatment plant, use of chloramines ensures
(a) taste & odour control.
(c) removal of permanent hardness.
(d) weed control in reservoirs.
Q4. Turbidity of water is an indication of the presence of
(c) suspended inorganic matter
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 ?
Q8. Fluorosis (a bone disease) is caused by the presence of high concentration of __________ in atmospheric air.
Q9. Presence of excess fluorine in water causes
Q10. Iron & manganese present as 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.