Question # 1

The one which is not a purine base

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Cytosine

Guanine

None of these

Adenine

What refers to the application of any process whereby the surface of steel is altered so that it will become hard.

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Caburizing

Case harden zing

Ammealing

Surface hardening

Yellow colour of the flame is observed with

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Calcium salt

Barium salt

Sodium salt

Potassium salt

Which of the following system has low as well as upper consolute temperature.

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Nicotine - water

Aniline -water

Triethlylamine -water

Phenol -water

Which of the following statement is not related with the effect of thermal pollution.

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Decrease in BOD

Increase in BOD

Reduction in DO

Change in algal production

Which of the following device is used to measure the surface tension.

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Polarimeter

Viscometer

Refractometer

Stalagnameter

Attention should be focused on qualitative changes in particle properties as a function of.

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Particle numebrs

Particle mass

Particle size

Particle density

Fish die in water bodies polluted by sewage due to.

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Pathogens

Clogging of gills by silt

Reduction in dissolved oxygen

Foul smell

Which of the following cause water pollution.

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Smoke

Automobile exhausts

Aeroplanes

Silt and posticides

Which of the following techniques involves ion exchange phenomenon.

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Size exclusion chromatography

Ion exchange chromatography

GLC

HPLC

Oxytocin, a pituitary hormone to

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Amino acid

Polypeptide

Protein

Conjugated protein

Which of the following group will have hyper conjugation effect when attached to benzene.

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------ CH3

----C6H5

------C(CH3)3

---------CH(CH3)2

Which of the following have +3 oxidation states.

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B & AI

In & TI

B & In

AI & TI

The three dimensional silicate anion (Si2O5^2-)n is present in

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Beryl

Silica

Asbestos

Clays

What is the following is incorrect.

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Water is more polar than H2S

H2O2 is a planar molecule

Heavy water is produced by the exhauative electrolysis of water made acidic

H2O2 act both as oxidising as well as reducing agent in acidic medium

Which of the following effects best explains that o-nitro phenol is insoluble in water.

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Inductive effect

Resonance effect

Intramolecular H -bonding

Isomeric effect

Lux -Flood concept is a dono-acceptor system of.

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Proton

Electron pair

Neurtron

Oxide ion

Which of the following is not an ore of iron.

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Haematite

Magnetite

Siderite

Monazite

Out of seven crystal system, how many can have body centered unit cell.

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3

4

2

7

Which element out of the following can ehibit a maximum con valency of seven.

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Chlorine

Sulphur

Fluorine

both Cl and F

The unit of specific conductance will be

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S cm-1

Ohm cm

Ohm cm-1

Mho cm

2- Butanol is optically active because a contains

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An asymmetric carbon atom

A plane of symmetry

Centre of symmetry

A hydroxyl group

Which of the following ahs non zero dipole moment.

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NH3

SF6

BF3

CO2

Metallic magnesium is obtained by

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Reduction of MgO with Coke

Electrolysis of an aqueous solution of MgCl2

Electrolysis of molten MgCl2

Displacement of magnesium by iron form MgCl2 solution.

Water that easily forms a lather of films and frotha when agitated with a soap solution called.

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Hard water

Heavy water

Soft water

Washing water

For an elementary reaction

2A + B ------------------- C + D

The molecularity of the reaction is.

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1

2+

3

4

A mordants is substance which in

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Coloured

Leuco -base of a dye

Fixes dye on the fabric

All of these

Suppose a sample is analyzed for a particular constituent by two different method One can tell whether the two average values are significantly different by applying which of the following test.

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Student's test

F test

Chi square test

Variance

What group of steels are molybdenum high sped steels.

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Group A

Group D

Group M

Group H

Give violet colour to flame

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Gallium

indium

Thallium

Aluminium

The expected specific wastes of textile industry is

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Cloth residue

Fibre residue

Dyes

All above

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