Biochemical Oxygen Demand (BOD) in river water:
1. | remains unchanged when algal bloom occurs |
2. | has no relationship with the concentration of oxygen in the water |
3. | gives a measure of Salmonella in the water |
4. | increases, when sewage gets mixed with river water |
Ultrasound of how much frequency is beamed into a human body for sonography?
1. 30-40 MHz
2. 15-30 MHz
3. 1-15 MHz
4. 45-70 MHz
Photochemical smog pollution does not contain:
1. ozone
2. nitrogen dioxide
3. carbon dioxide
4. PAN (Peroxy Acyl Nitrate)
The limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal wastewater into natural surface water is:
1. < 3.0 ppm
2. < 10 ppm
3. < 100 ppm
4. < 30 ppm
Which of the following supports a dense population of plankton and littoral vegetation?
1. Oligotrophic
2. Eutrophic
3. Lithotrophic
4. Agroecotrophic
Maximum greenhouse gases are released by:
1. India
2. Britain
3. USA
4. France
In a coal-fired power plant, electrostatic precipitators are installed to control the emission of:
1.
2.
3. SPM
4. CO
A lake with an inflow of domestic s wage rich in organic waste may result in:
1. Drying of the lake very soon due to algal bloom
2. Increased production of fish due to lot of nutrients
3. Death of fish due to lack of oxygen
4. Increased population of aquatic food web organisms
Minamata disease is caused due to the presence of …………. in water.
1. cadmium
2. lead
3. arsenic
4. mercury
Biological Oxygen Demand (BOD) is a measure of:
1. | industrial wastes poured into water bodies |
2. | extent to which water is polluted with organic compound |
3. | amount of carbon monoxide inseparably combined with haemoglobin |
4. | amount of oxygen needed by green plants during night |