Question # 1

How many sigma and pi bonds are there in a CO2 molecule.

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2 sigma

2 sigma and 4 pi

2 sigma and 2 pi

4 sigma and no pi

Mangalium is an alloy of.

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Al + Mg

Mg + Ai + Mn

Mg + Ai + Cu

Mg + Ai + Cu + Mn

The IUPAC name of HCOOCH3 is.

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Methoxy methanol

Ethanoic acid

Methyl methanoate

Methoxy methane

What is the ratio of stress to strain in a material loaded within its elastic ranger.

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Poisson’s ratio

Refractive index

Modulus of elasticity

None of above

Which of the following give higher fibre strength.

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Eucalyptus

Pine

Bagnasse

Sugar cane

Pick out the incorrect statement for Xe F6

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XeF6 is hydrolyzed practically to form XeOF4

It reacts with SiO2 to form Xe F4

On complete hydrolysis, it forms XeO3

It acts as F acceptor when treated with alkali metal fluoride, but cannot act as F donor to form complexes.

A stable molecule is a group of atoms held together by

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Chemical forces

Physical forces

Valence force

None of above

Which of the following statement is not true with respect to photo chemical reactions.

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These take place in the presence of light

Free energy of these reactions may be positive or negative

Light intensity affect these reactions

Temperature has significant affect n rate of these reactions

Which of the following is not a naturally occurring dye.

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Indogo

Indigotin

Alizarin

Malachite green

What is the purpose of molybdenum in steel alloying.

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To increase dynamic and high temperature strength and hardness

To increase brittleness

To increase corrosion and resistance

All above

Which of the following statement is not relat4ed wiht SO2

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It is a colourless gas

It has sharp and pungent odour

It is moderately soluble in water

It is reduced slowly in clear air to H2S

Photochemical smog consist of excessive amount of X in addition to aldehydes ketones, PAN etc. X is.

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Methane

Carbon monoxide

Ozone

Carbondioxide

The link between classical thermodynamics and quantum mechanics is prevented by

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Statiatical mechanics

Boltzmann law

Wave mechanics

Matrix mechanics

The addition of As to Ge makes the latter a

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Metallic conductor

Ionic conductor

Intrinaic conductor

Extrinsic semiconductor

What ASTM test for shear strength is designated for plastics.

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D 732

D 790

D 695

D 638

The molarity of a 500 mL solution containing 4 g NaOH

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0.1

0.2

0.3

0.4

The unit of sound pressure level is

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Pascal

Decibel

Newton

Ampere

Types of carides

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Ionic carides

Covalent carbides

Interstitial carbides

All above

Peeling of ozone umbrella is due to.

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CFCa

PAN

CO2

Coal burning

Which of the following analytical technique is used for the separation of an interfering substance or analyte from the mixture.

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Precipitation

Distillation

Electrode position

All above these

Sodium react more vigorously than lithium because.

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It is a metal

It has higher atomic mass

It is more electronegative

It is more electropositive

The spectral line obtained when an electron jumps from n = 6 to n= 3 belongs to.

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Balmer series

Layman series

Paschen series

Bracket series

The bond between two identical non metal atoms has a pair of electrons.

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Unequally shared between the two

Transferred fully from one atom to another

With identical spins

Equally shared between them

Which of the following methods is the most common method for separation of liquid components from a mixture.

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Dialysis

Solvent extraction

Precipitation

Distillation

What is prefix in steel identification means it is made in an electric furnaced.

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E

H

B

Z

Equivalent conductance is expressed in the units.

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S cm-1 eq -1

S cm eq-1

S cm2 eq-1

S cm2 eq

The rate constant of a reaction depends on

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Concentration of reactants

Concentration of products

Temperature

Time

The substance added to the soil to provide one or more nutrient elements essential for plants growth are called.

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Growth hormones

Fertilizers

Salts

Minerals

In which of the following characteristics does hydrogen resemble halogens.

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Hydrogen is the lightest gas

H atoms contains one electron each

Hydrogen forms ionic hydrides with alkali metals

Hydrogen has three isotopes.

Which of the following technique is used for separation of volatile components.

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GC

HPLC

FPLC

TLC

The bromine produced on commercial scale may contain impurities of.

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Water

Chloride

iodine

All above

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