Question # 1

A maltose molecule is formed by the combination of:

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two glucose molecules

one glucose and one fructose

molecule

one glucose and one galactose

Thrombin is locally used to stop

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Heart disease

Bleeding

Blood

None of these

Organic pollutants in water are measured by

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DO

COD

Water logging

PH

Which one of the following is used as coagulant for purification potable water

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Copper sulphate

Alum

Barium sulphate

Nickel sulphate

Potassium crystallizes with a

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Orthogonal lattice

Cubic lattice

Triclinic

Ortho rhombic lattice

pH value of pepsin is:

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3

2

4

1.4

During thunderstorms, water dissolves

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Dust particles

HCl

Nitric acid

Clouds

The scale of temperature that shows the freezing point of water at 0° is called

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Fahrenheit

Kelvin

absolute

Celsius

UV rays inactivate enzymes because they

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change sequence of amino acids of enzymes

They add prosthetic group to them

They increase their specificity

affect structure of enzymes

Mass spectrometry is used to determine the

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Number of isotopes of an element

Relative abundance of isotopes

Relative isotopic masses

All of these

Steroids belong to the family of

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Protein

Enzyme

Lipids

Carbohydrates

All C - H bond lengths of benzene ring is

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1.07A°

1.09A°

1.08A°

None

The two half cells of a galvanic cell are connected by

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Ammeter

Salt bridge

Hydrogen electrode

Copper electrode

The vapour pressure of two liquids 'p' and 'Q' are 80 and 60 torr respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mol of Q would be

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140 torr

20 torr

68 torr

72 torr

Hydrocarbons contain :

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Carbon only carbon

Hydrogen only

Carbon & hydrogen

Carbon , hydrogen & halogen

Naturally occurring lipids are called

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Fats

protein

Steroids

None

The reaction of 4-bromobenzyl chloride with NaCN in ethanol leads to

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4-Bromobenzyl cyanide

4-Cyanobenzyl chloride

4-Cyanobenzyle cyanide

4-Bromo 2-cyanobenzyl chloride

The equivalent weight of KMnO₄(formula weight = M) when it is used as an oxidant in neutral medium is

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M

M/2

M/3

M/5

Polyester resins have special use in:

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Clothing

Paints

Emulsion

Floor covering

If pH of buffer of 1 mole dm^-3of HCOOH + 0.1 mole dm^-3HCOONa having pKa = 3.78 is

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1.78

2.78

3.78

4.78

An oil or fat with no double bond have iodine number:

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Zero

100%

50%

minimum

Lead accumulator stops discharging current when

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Lead at anode converted to PbO₂

PbO₂at cathode converted to Pb

Both electrodes are completely covered with PbSO₄

Both electrodes are completely covered with Pb(OH)₂

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