Q. In sewage treatment of oxidation pond we can see the water up to 2 meters deep.

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Q. In which of the following treatment of sewage plant we can find disinfection as a step?

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Q. How many percentage of BOD removes in primary treatment?

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Q. What is the main objective of secondary treatment of sewage plants?

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Q. How many common approaches are used in secondary treatment?

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Q. What is the meaning of ‘Tainting’ related to marine pollution?

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Q. When drill cutting dumped on the seabed which toxic is produced?

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Q. What happens if liquid oil contaminates a bird’s plumage?

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Q. What is noise?

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Q. In which unit sound is measured?

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Q. Which pollution cause hearing loss in organisms?

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Q. What is the dB of a threshold of hearing?

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Q. What is the dB of a threshold of pain?

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Q. All sound is noise.

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Q. At what decibel instantaneous rupture of membrane happens?

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Q. What is the ambient noise level in the residential one during night time?

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Q. What is called for a temporary hearing loss?

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Q. What is the permissible noise limit of 120 db?

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Q. At what level a sound becomes physical pain?

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Q. Which of the following sound is pleasant to our ears?

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