Q. Which of the following is not a source of ozone emission in the atmosphere ?

View solution

Q. Oceans act as sinks for atmospheric gases including carbon dioxide whose concentration in the atmosphere is increased by the

View solution

Q. Pick out the correct statement.

View solution

Q. The upper layer of atmosphere is called the

View solution

Q. Coal mines drainage waste water (acidic in nature) results from the earth's water percolating through the voids created in coal bed during mining. This polluted water which either drains out naturally to water courses or are removed before starting the mining is

View solution

Q. Fine grit present in sewage is removed in the __________ during sewage treatment.

View solution

Q. The lowest layer of atmosphere is known as the

View solution

Q. As per the world health organisation (WHO) specification, the maximum permissible concentration (i.e., TLV) of particulate matter in air is __________ μg/m³.(μg-microgram)

View solution

Q. Which of the following is not a weightless pollutant ?

View solution

Q. In water treatment plant, zeolite process is used to remove the __________ of water.

View solution

Q. For existence of aquatic life in water, the dissolved oxygen content in it, should not be less than __________ ppm.

View solution

Q. Fresh sewage is __________ in nature.

View solution

Q. In a sedimentation tank, the detention period for water ranges from __________ hours.

View solution

Q. On prolonged exposure to high concentration of carbon monoxide (> 5000 ppm), man dies because

View solution

Q. The effect of increase in carbon dioxide level of the atmosphere and its profound effect on our climate is called the

View solution

Q. Arsenic pollutant is not generated in____industries.

View solution

Q. The resistance of water to the passage of light through it is a measure of the

View solution

Q. Color test of water is done with an instrument called

View solution

Q. Which of the following gases is having the widest explosion limit (about 2 to 81% gas in gas-air mixture), rendering it the property of the most explosive gas ?

View solution

Q. Aerosols present in atmospheric air may be

View solution