Question # 1

For an average exposure of 8 hours per day, the maximum permissible concentration limit of CO in the atmosphere is.

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50 ppm

500 ppm

10³ ppm

20 ppm

The correct order of ionic radii for the following ions is.

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S²- < P^3- < Cl- < K+

Cl- > S2+ > P3- > k+

K+ > Cr > S2+ > P3-

P3+ > S2 > Cl - > K+

Identify an oxygenated cyclic terpenoid

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a- pinene

Camphor

Citral

Geranial

What element is the most abundant by mass in the Earth's crust.

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Fe

H

O

K

Which of the following is major sink for carbo monoxide.

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Water

Soil

Animal respiration

Salts dissolved in ocean water

1-Butyne on oxymereuration -demercuration would give.

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Butanone

Butanal

Propanol and methanol

Propanoic acid and formic acid

Which among the following is secondary pollutant.

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CO

CO2

PAN

Aerosol

Aviation Fuel contains.

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Light Naphtha

Medium Naphtha

Kerosene

Diesel

Which sequence of steps is correct in paper making machine

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Pressing Dyring, Flow spreader Calender stock

Flow spreader, Pressing, Prying Calender sock

Drying ,Pressing , Flow spreader, Calender stock

None of above

Which of the following energy is trapped by the autotrophic organisms.

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Mechanical energy

Electrical energy

Radiant energy

Electronic energy

Cement containing higher percentage of gypsum than required.

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Sets slowly

Sets repidly

_{Does not set at all}

Has no effect

Which one of the following has a linear structure.

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H2O

CO2

NO2

SO2

Major ingredients of traditional ceramics

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Silica

Clay

Feldspar

All

The diameter of fly ash particles is._________ micro meter

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5-10

10-20

20-30

100

The sugar present in DNA is

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D- Ribose

D-Glucose

2- Doxy D-Ribose

3-Deoxy D-ribose

Equal volumes of all gases, under similar conditions of temperature and pressure, contain equal number of molecules. This is a statement of.

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Graham's law

Dalton's law

Avogadro' law

Boyle's law

What is defined as an intimate mechanical mixture of two or more phases having a definite composition and a definite temperature of transformation within the solid state.

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None of these

Pearlite

Eutechtoid

Delta solid solution

In the forth floatation process for the purification of ores, the ore particles float because.

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They are light

Their surface is not easily vetted by water

They bear electrostatic charge

They are insoluble

Artificial nitrogen fixation may occur by the formation of.

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Nitric acid

Ammonia

Nitrides

Any of above

The most reactive alkali metal among the following is

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Li

Na

Cs

Rb

Which of the following trihalides of nitrogen behaves as the weakest base.

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NF3

NCl3

NBr3

NI3

Galvanized steel are steel products coated with

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Carbon

Sulphur

Zinc

Iron

Which one of following is non polar

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CH2Cl2

CCl4

CHCl3

CH3Cl

Cement is a mixture of

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Clay and clinker

Clay limestone and gypsum

Limestone and gypsum

Binder

Which of the following salt is water insoluble.

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K2SO4

Na2SO4

BaSO4

None of abvoe

Water is often treated with chlorine to

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Increases oxygen content

Kill germs

Cause sedimentation

Remove insoluble impurities.

Arrhenius concept explained

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Constant heat of neutralization

Quantitative determination of acid base strength

Catalytic property of acid

All above

When propyne is treated with equeous H2SO4 in the presence of HgSO4 the functional isomer of the major product obtained in.

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Propanal

Acetone

Propane 2 -nl

Propanol

Which of the following is the strongest oxidant.

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F2

Cl2

br2

I2

Molten iron withdrawn from the blast furnace is called.

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Wrought iron

Pig iron

Bessemer iron

Stainless steel

Alnico is an alloy containing how many percent nickel.

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10%

14%

18%

22%

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