Question # 1

How many % age of nitrogen present in air by volume?

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70%

75%

78%

80%

Major portion of ozone layer is foun in.

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Troposphere

Stratosphere

Mesosphere

Thermosphere

Which acid is used for food preservation?

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Hydrochloric acid

Benzoic acid

Sulphuric acid

Nitric acid.

Arrhenius put forward acid base concept in.

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1878

1786

1787

1790

Vitamin B₁ (Thiamin) was discovered by.

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Hopkins

Funk

J.Watson

Davy

Which colour of HI is ?

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Orange

Purple

Red

Colourless

Which salt is used as a table salt?

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NaCl

Na₂CO₃

Na₂SiO₃

NaCl

Which disease causes bone and tooth damage?

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Fluorosis

Hepatits

Cholera

Jaundice

Marsh gas is mostly :

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ethane

methane

butane

propane

At which temperature o water shows mxamimum density.

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0 ^oC

100^oC

4^oC

-4^oC

The process of removing temporary hardness of water.

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Clark's method

Washing soda method

Sodium zeolite

Filteration method

The % age of drinkable water on earth is

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2.0%

0.02%

0.2%

5.0%

Which of the following is a poisonous gas.

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Oxygen

Ozone

Nitrogen

Carbon dioxide

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