Question # 1

Prilling is a process in which

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Concentration of urea is increased

Water is removed from urea

Molten urea is converted to solid drop

Some other ingredients are added to urea

Which one is not an argillaceous material.

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Clay

Shale

State

Gypsum

The temperature of digester is main tained at

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100^oC

160-180^oC

200^oC

200-240^oC

Which three elements are needed for the healthy growth of plants

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N,S,P

N,Ca,P

N,P,K

N,K,C

Which one of the following set of raw material is most suitable for manufacture of urea.

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CH4, N2 and CO2

H2, N2 and CO

H2,CO2 and H2O

H2O, N2 and H2

Which process of pulp making is mostly used in Pakistan.

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Kraft process

Sulphite process

Neutral sulphite semi chemical process

Wet process

The nitrogen present in some fertilizers helps plants

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to fight against diseases

to produce fat

to undergo photosynthesis

to produce protien

Woody raw material for paper pulp is obtained from

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Cotton

Bagasse

Poplar

Rice straw

Which woody raw material is used for the manufacture of paper pulp.

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Cotton

Bagasse

Poplar

Rice straw

Usually the percentage of moisture is paper is

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1- 3%

4-6%

6-8%

5%

Pulp is washed to remove lignin from it. Due to the presence of lignin in pulp paper becomes.

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Soft

Brittle

Acidic

Colourless

In Pakistan pulp is usually bleached with Cl2. The residual chlorine is removed from pulp by an antichlor which is

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dil HCl

dil NaOH

Water

NaCl

Which one of the following is calcareous material

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Marine shells

clay

Shale

Blast furnace slag

Which one of the following is inorganic fertilizer.

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Manure

Urea

Ammonium nitrate

All of these

During the manufacturing process of cement the temperature of the decomposition zone goes up to

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600°C

800°C

1000°C

1200°C

Micronutrients are required in quantity ranging from

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4g-40g

6g-200g

6kg-200kg

4kg-40kg

Phosphorus helps the growth of

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Root

Leaf

Steam

Seed

the percentage of nitrogen in NH3 is

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46%

60%

82%

100%

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