Question # 1

The percentage of water in human body is about:

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60%

50%

70%

80%

Water become hard because of:

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Ca+2

Mg+2

SO-24

all of these

Incinerator reduces solid waste into .

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Ash

Flue gas

Heat

All of them

When bones are heated they give.

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Starch

Gelatin

Fats

Oils

Which of the following can be used as a fuel?

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Methanol

Ethanol

Bio-diesel

All of them

ozone depletion (i.e O3--------------> O2 + O) occurs in:

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lower stratosphere

middle stratosphere

upper stratosphere

troposphere

You want to dry a gas which one of the following salt you will use?

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CaCl₂

NaCl

CaO

Na₂SIO₃

The formula of ozone is.

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O₂

O₃

O

CO

Number of discovered element till today are.

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140

118

90

16

Which one of the following compounds is an aldehyde?

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CH₃-CH₂-OH

CH₃-COOH

CH₃CHO

CH₃COCH₃

Which gas like a glass wall of g green house:

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CO

O2

CO2

N2

The raw materials for the manufacturing of urea are.

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Ammonia

Carbondioxide

Limestone

a & b

A reaction between an acid and base produce.

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Salt and water

Salt and gas

Salt and acid

Salt and bases

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