Question # 1

Which process is responsible for ascending of water in plants from roots to leaf?

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Condensatin

Transpiration

Capillary action

Evaporation

Which element protects teeth from decay?

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Potassium

Fluorine

Sodium

Calcium

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

Some organic compound are soluble in water due to the presence of .

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-OH

H⁺

Botha a and b

Covalent bond

Mg²⁺ and Ca²⁺ ions react with soap to form calcium and magnesium salts of fatty acids called.

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Gelatin

Scum

Paste

None 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

Ionic compounds are soluble in water due to:

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Hydrogen bonding

ion-dipole forces

Dipole-dipole forces

Dipole -induced dipole forces

Which one of the following disease causes severe diarrhea and can be fatal:

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Jaundic

Dysentery

Cholera

Typhoid

Example of pest is

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Weeds

Herbs

Insect

All of them

Vibrious cholera bacteria causes the disease

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Cholera

Diarrhea

Jaundice

Hepatitis

Which one of the following gases is used to destroy harmful bacteria in water.

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Iodine

Chlorine

Fluorine

Bromine

Hard water can cause.

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Stomach disorder

Boiler blasts

Inefficiency of engine

All of them

Which one of the following salts makes the water permanently hard?

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NaCO₃

NaHCO₃

CA(HCO₃)₂

CaSO₄

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