Question # 1

Hookworm is a parasite that infects the:

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large intestine

small intestine

stomach

liver

Salt makes the water permanently hard.

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CaSO₄

Ca(HCO₃)₂

NaHCO₃

NaCO₃

soap is the sodium salt of long chain.

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Amino acids

Fatty acids

Nucleotides

None of them

The percentage of water in human body is.

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40%

50%

60%

70%

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

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1 gcm^-1

2 gcm^-1

3 gcm^-1

4 gcm^-1

Which ion cause water hardness?

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Al²

Mg²

Fe²

Na²

Example of pest is

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Weeds

Herbs

Insect

All of them

Hard water can cause.

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Stomach disorder

Boiler blasts

Inefficiency of engine

All of them

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

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Typhoid

Jaundice

Cholera

Dysentery

Water become hard because of:

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Ca+2

Mg+2

SO-24

all of these

The % age of drinkable water on earth is

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2.0%

0.02%

0.2%

5.0%

Water has a maximum density at .

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10^oC

0^oC

4^oC

100^oC

Temporary hardness can be removed by__________.

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Quick lime

Slaked lime

Lime stone

HCl

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