Question # 1

Which of the following cause water pollution.

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Smoke

Automobile exhausts

Aeroplanes

Silt and posticides

All the strong acids have very close pKas value and they appear to have nearly equal strengths in aqueous solutions. The phenomenon is called as.

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Levelling effect

Differnetiating effect

Levelling solvent

Differnetiating solvent

Which of the following level is an indicator of hearing loss.

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> 25 dB

< 25 dB

<20 dB

None of these

Treatment of phenol with cold dilute nitric acid gives.

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Only o-nitro phenol

Only p-nitro phenol

2,4,6 -Teinitro phenol

Mixture of o-and p-nitro phenol

"There is a plenty of room at the bottom" This was stated by

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Issac Newton

Albert Einstein

Richard Feynman

Eric Drexler

The melting of nearly all glass is done in a continuous tank furnace. which operates steadily over periods of up to.

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a day

a month

a year

None of these

According to SHAB, Lewis acid are divided into.

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Two classes

Three classes

Four classes

None of above

Primary structure of protein refers to

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Amino acid sequence

Arrangement of peptide chains

Orientation of amino acids

Whether is has a or b helix in space structure.

A unit cell having dimension , a = b c, alpha, beta, gama = 90^o is known as.

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Cubic

Hexagonal

Orthorhombic

None of them

Which element among the following cannot exhibit variable electronvalency

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₂₉Cu

₅₀Sn

₂₅ Mn

₃₈ Sr

Amino acids are are important in biochemistry which of the following statements is not correct regarding amino acids.

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These are amphoteric substances tend to undergo internal protein transfer

In aqueous solutions these substances tend to undergo internal proton transfer

These for zwitter ion in aqueous medium

These always contain two amino groups.

The rusting of iron is catalyzed by which of the following.

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Fe

H+

O2

Zn

In normal mode of operations of liquid liquid partition, a polar stationary phase is used with a non polar mobile phase Which of the following solvent is used as mobile phase.

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Ethanol

Propanol

Butanol

Hexane

Which of the following fuel is used in flame photometry.

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Hydrogen gas

Acetylene gas

Methane

Propane

All above

Which type of polymer the Nylon -06 is

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Polyamide

Polyester

Addition

Homopolymer

Pick out the incorrect statement for SO2

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It turns filter paper moistened with acidified K2Cr2O7

It turns starch iodate paper blue

It does not react with chlorine in presence of charcoal

It decolourises acidified KMnO4 solution.

The range of sound pressure for uncomfortable level is.

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80 - 90 dB

100 - 120 dB

130-140 dB

All above

Which of the following metals form volatile carboyl with CO below 80^oC

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Cu

Fe

CO

Ni

What refer by the ability of steel to be hardened through to its centre in large section?

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Malleability

Hardenability

Ductility

Rigidity

Combination of a -amino acid through which linkages results result in formation of protein

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Ester linkage

Glycosidic linkage

Lactum linkage

Peptide linkage

The strongest acid is.

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HNO2

HNO3

H2N2O2

HNOS

The simplest formula of a compound containing 50% of element X

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XY2

XY

X2Y

None of the abvoe

Ground state electronic configuration of valence shell in N2 m lecule is written as (a2s)2, (o*2s)2 , (pi sp)4, (o2p)2, Hence, the bond order of N2 molecule is.

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1

2

3

0

Aviation Fuel contains.

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Light Naphtha

Medium Naphtha

Kerosene

Diesel

The most electronegative and the most electromotive elements of the first period is

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H and He

Na and Cl

Li and F

H and He

Photochemical among is generally formed

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In early hours of winters

Around mid day in summer months

When intensity of solar radiation sis very low

When concentration of particulate matter is very low.

What is the ASTM tension testing designation for standard method for steel products.

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A 370

E 345

E8

E 9

Zeigler Natta catalyst is.

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Pt/PtO

TiCl4/Al(C2H5)3

Pt/Rh

Pt

Washing soap can be prepared by saponification with alkali of _____ of the following oil.

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Rose oil

Paraffin oil

Groundnut oil

Coconut oil

In diborane (B2H6)

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The structure is similar to that of C2H6

All the atoms are in one plane

The born atoms are linked through hydrogen bridges

There is a direct boron boron bond

Which of the following is an example of molecular solids.

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MgO

ZnO

Ice

Graphite

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