Question # 1

The polymers which can not be re-softened again and again are called

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Thermoplastic

Thermosetting

Both a and b

None

Which is unnecessary for purification of water for drink purposes:

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coagulation

aeration

treatment with lodine

treatment with chlorine

The layer of gases around the earth are called?

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Atmosphere

Hydrosphere

Lithosphere

All of these

All of the following are aliphatic amino acids except

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Glycine

Alanine

Proline

Lysine

Number of electrons involved in d-d transition of [Ti(H2O)6]+3

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1

3

2

4

Thrombin is locally used to stop

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Heart disease

Bleeding

Blood

None of these

Optimum temperature for enzyme activity is

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125°C

37°C

40°C

100°C

Which of the following is not heterocyclic compound?

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Naphthalene

Furan

Pyridine

Pyrrole

Potassium fertilizers are especially useful for:

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Tobacco

Potato

Coffee

All of these

Which factor is helping to reduce the environmental pollution

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Urbanization

Industrialization

Increase of plantation

Rapid growth of population

Air can be distilled fractionally because the constiltuents of the air:

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have different densities

can be liquefied

are gases at room temperature

have different boiling points

Which set of hybrid orbitals has planar triangular shape

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sp³

sp

sp²

dsp²

Content of carbon in steel is:

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0.12 to 0.25%

0.25% to 2.5%

3.0 to 3.5%

4.0 to 4.5%

Formula of acetone is:

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HCHO

CH₃CHO

CH₃OCH₃

CH₃OC₂H₅

Water H₂O is liquid while hydrogen sulphide H₂S is a gas beause

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Water has higher molecular weight

Hydrogen sulphide is a weak acid

Sulphure has high electronegativity than oxyhe

Water molecules associate through hydrogen bonding

In sp²type hybridization the three equivalent sp²orbitals lie in the same plane and at angle of

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0°

60°

120°

180°

The degree of unsaturation in fats or oils is usually measured by numbers of grams of iodine required by 100 grmas of fat, this is called

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Oil number

Saturation number

Iodine number

Un saturation number

What element is not essential the growth of plants and is not required in the fertilizers

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Nitrogen

Potassium

Phosphorus

Barium

Which of the following elements have the largest radius

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F

Cl

Br

l

With amino acids ninhydrin solution gives

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Blue

Violet

Bluish violet

White

Which of the following charge

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Li

Be

H

He

To calculate volume of the solvent, we need to know, the :

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Density of solute

Normality of solute

Mass of solute

Molarity of solute

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