Question : If in any water body, there is a high BOD value then it is generally _____.
Option 1: very clean
Option 2: very polluted
Option 3: highly productive
Option 4: highly unproductive
Correct Answer: very polluted
Solution : The correct option is very polluted.
Biochemical Oxygen Demand (BOD) is an important water quality measurement that reflects the extent of organic pollution in bodies of water by measuring the quantity of oxygen used by microbes in reducing organic materials, hence assisting in the assessment of the possible environmental impact.
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Question : What will happen to the level of water in a vessel when a piece of ice floating in it melts?
Option 1: Decreases
Option 2: Increases
Option 3: Remains same
Option 4: First increases and then decreases
Question : If in the east it is Guhar Moti, in the north it is Siachen Glacier, in the south, it is:
Option 1: Kuttanad
Option 2: Kanyakumari
Option 3: Rameshwaram
Option 4: Indira Point
Question : It is easier for man to swim in seawater than river water because
Option 1: The density of seawater is lesser than the density of river water.
Option 2: The density of seawater is more than the density of river water.
Option 3: The sea is deeper than the river.
Option 4: The sea is wider than the river.
Question : Why do pickles last longer?
Option 1: Only beneficial bacteria can grow in the pickle.
Option 2: The water content of the pickle protects the pickle from spoilage.
Option 3: Pickle is prepared in a vacuum so that no harmful bacteria can grow on it.
Option 4: Bacterial and fungal cells get plasmolysed in high salt concentrations of pickle.
Question : Carrot is orange in colour because:
Option 1: It grows in the soil.
Option 2: It is not exposed to sunlight.
Option 3: It contains carotene.
Option 4: The entire plant is orange in colour.
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