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chemical substances that persist in the environment bio-accumulate
through the food web and pose a risk causing adverse effects to human health.

A) Autogenic organic pollutants B) Persistant organic pollutants
C) Limnonic organic pollutants D) Nectonic organic pollutants
The cofactor for the enzyme reaction in PCR is

A) Sulphur dioxide 8) HCl

C) Magnesium and potassium D) Taq polymerase

Read the following statements.
i. Solutions are homogenous mixture of two or more substances such as solids,
liquids or gases.

ர்‌. According to Henry’s law, the solubility of a gas in a liquid is directly proportional
to the partial pressure of the gas over the solution.

Choose the correct option :
A) Only iis correct B) Only ii is correct
C) Both are incorrect D) Both are correct

Find out the odd one.
A) Nucleic acid B) Dacron C) Cellulose D) Rubber

Read the statements.
i. Before staining all the bacteria are colourless.
1. Afterwards gram positive bacteria are stained red.
iii. Afterwards gram negative bacteria are stained violet.
iv. In gram staining of bacteria Lugol’s iodine is used as mordent.
Choose the correct option :

A) All the statements are correct B) Both i and ii are correct

C) Both ii and iii are incorrect D) All the statements are wrong
‘Silent Spring’ was written by

A) Ellen Swallow Richards B) Rachel Carson

C) Gifford Pinchot D) Aldo Leopold

Coarse screens are

A) Used to remove floating materials like rags, paper, wood from sewage
B) Used to remove organic materials from the sewage

C) Used to remove CO, and NHg from the sewage

D) Used to remove odour from the sewage

Identify the Gibbs free energy formula.

A) pKa =- log Ka 8) Ka=[H*] [A"]

C) AG =AH- TAS D) pH =pKa+log Na

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