I SEM MDC

The gas which reacts with haemoglobin in blood is ———

• CO

• CO2

• SO2

• NO

Ozone is present in ———————–

• Thermosphere

• Mesosphere

• Stratosphere

• Troposphere

Biochemical oxygen demand (BOD) is a measure of ———–

• Organic pollutant in water

• Organic SPN in water

• Inorganic pollutants in water

• Particulate matter in water

1. Which of the following salts is the main cause of permanent hardness of water?

• Magnesium sulphate

• Magnesium bicarbonate

• Magnesium carbonate

• None of the above

1. What is the health effects of excess fluoride in drinking water?

• Toothaches

• Lung disease

• Fluorosis

• Intestinal infection

In 1984, the Bhopal gas tragedy took place because methyl isocyanate------------

• 1. reacted with ammonia

• 1. reacted with water

• 1. reacted with DDT

• 1. reacted with CO2

Identify the correct statement regarding negative soil pollution.

• Contamination of the soil due to addition of insecticides

• Reduction in soil productivity due to soil erosion

• Reduction in soil productivity due to the addition of pesticides and herbicides

• Contamination of the soil due to natural disasters.

1. Which of the following is mainly responsible for the causes of water pollution?

• Afforestation

• Oil refineries

• Paper factories

• Both b and c