Question # 1

Example of pest is

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Weeds

Herbs

Insect

All of them

Boiling point of water is:

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0^oC

25^oC

80^oC

100^oC

The chemical used in Clark's method is:

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CaO

slaked lime(Ca(OH)s)

washing soda

sodium zeolite

The % age of drinkable water on earth is

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2.0%

0.02%

0.2%

5.0%

The boiling point of water is.

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100^oC

4^oC

0^oC

25^oC

The lives of aquatic plants and animals are indirectly related to concentration of dissolved gas in water.

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Nitrogen

Hydrogen

Oxygen

Carbon

Hard water can cause.

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Stomach disorder

Boiler blasts

Inefficiency of engine

All of them

The density of water is ................. at 4^oC

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1 gcm^-1

2 gcm^-1

3 gcm^-1

4 gcm^-1

Salt makes the water permanently hard.

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CaSO₄

Ca(HCO₃)₂

NaHCO₃

NaCO₃

Industrial effluents are highly

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Toxic organic compounds.

Inorganic salts.

Heavy metals

All of them

The bond angle between H-O-H in water is:

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104.5^o

104.6^o

104.7^o

104.8^o

A disease is caused by excess of bile pigments in the blood is.

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Typhoid

Jaundice

Cholera

Dysentery

Freezing point of water is:

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-4°C

0°C

-36°C

-58°C

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