Question # 1

Methyl butanoate smells like;

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a pine apple

an apple

an orange

a lemon

___________ is not green house effect.

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Increase of food chain

increase atmospheric pressure

Increase of sea level

Increase of flood risks

How many units are in Pakistan for manufacturing of Urea.

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3

6

9

12

Conversion of dead plants into coal by the action of bacteria and heat is called.

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Carbonization

Catenation

Hydrogenation

Cracking

Cause of global warming is:

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CO₂gas

SO₂gas

NO₂gas

O₂gas

Incomplete combustion of alkanes produces.

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Carbon dioxide only

Carbon monoxide only

Carbon monoxide and carbon black

Carbon dioxide and carbon black

The recombination of O and O₂ in mid stratosphere is an

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Exothermic reaction

Endothermic reaction

Heat absorbing process

None of these

The two major components of atmosphere are:

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Hydrogen and oxygen

Nitrogen and Hydrogen

Nitrogen and oxygen

Oxygen and water.

|Which one is not an Arrhenius acid?

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HCl

H2SO₄

CO₂

HNO₃

The process by which water rises up from the roots of plants to leaves is called.

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Photosynthesis

Respiration

Surface tension

Capillary action

The freezing point of water is:

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10 ^oC

100^oC

0^oC

46^oC

Cause of Night blindness is.

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Deficiency of vitamin B

Deficiency of vitamin A

Deficiency of vitamin D

Deficiency of vitamin E

The base which is used in alkaline batteries is.

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NaOH

Al(OH)₂

KOH

Mg(OH)₂

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