Question # 1

The light absorbed in UV and visible region causes.

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Vibrational energy changes

Rotational energy changes

Electronic excitation

All of these

Water pollution is due to

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Agricultural discharges

Swages and other wastes

Industrial effects

All the above

The size of nanoparticles is between __________ nm

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100 to 1000

1 to 100

0.1 to 10

0.01 to 1

Which of the following exists as polymeric chains in solid state.

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Sr Cl2

Ba Cl2

MgCl2

BeCl2

In order to increase the rate of the reaction one should.

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Increase the concentration of products

Decrease the concentration of reactants

Decreases the concentration of products

Both C and D statement are correct

Which of the following is not an adsorption indicator.

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Eosin

Bromocrsol green

Fluorescein

Phenolphthalein

The number 7.43 is rounded to

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7,44

7.4

7.45

7.3

The Lewis formula of SOCl2, the total number of bond pairs and lone pairs of electron around sulphur are.

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2 ,1

2,2

3,1

3,0

Which of the following is not an alkali metal.

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Potassium

Francium

Sodium

Strontium

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

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> 25 dB

< 25 dB

<20 dB

None of these

The IUPAC suffix used for ______ NC group is

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Cyanide

Isocyanides

Carbylamines

Nitrite

Which cast iron is hard and wear resistant.

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Grey iron

White iron

Melleable iron

None of these

Catenation is a process of.

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Formaton of cations

Deposition of cations

Formation of long chain of identical atoms

Formation of covalent bond

Which of the following alloys contains Cu and Zn

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Bronze

Brass

Gun metal

Type metal

Lother Meyer plotted a graph showing variation of.

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Atomic volume with increase in atomic number

Atomic volume with increase in atomic weight

Atomic redii with increase in atomic weight.

Atomic weight which increase in atomic number

For quality control of Portland cement, the test essentially done is.

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Setting time

Soundness

Tensile strength

All

What is the activation energy of a reaction whose rate constant increases by a factor of 100 upon increasing the temperature from 300 K to 360 K.

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27

35

42

69

If for a solution of an electrolyte. It is the transport number of the cation, then the transport number of the anion I, is equal to

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t/2

1 - t+

1 + t+

(i -t) /2

The correct order of acid strength is.

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HIO4 > HBrO4 > HCIO4

HCIO4> HBrO4 > HIO4

HBrO4 > HIO4 > HCIO4

HBrO4 > HCIO4 > HIO4

The pair of molecules or ions having identical geometry is.

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BCl3, PCl3

BF3, NH3

CHCl3, CCl4

SiCl4, CCl4

The thermal conductivity of an SWNT along length is _____ watt/(m.k)

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35

330

386

3500

In the presence of dilute alkali monosaccharides undergo reversible isomerisation . The reaction known as.

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Kiliani reaction

Weermann rearrrangement

Lobry do Bruyn Van Ekenstein rearrangement

Mutarotation

What refer to the casehardening process by which the carbon content of the steel ear the surface of a part is increased?

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Carburizing

Annealing

Normalizing

None of these

Not a Characteristic property of ceramic material

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High temperature stability

High mechanical strength

Low elongation

Low hardness

The value of comprehensibility factor (z) = pV/nRTfor an ideal gas is equal to.

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R

1

2

3

The units of surface tension in SI system are

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Joule m-1

Newton m-1

Erg cm-1

Dynes cm-2

In Ostwald's process of manufacturing nitric acid a mixture of ammonia gas with air is mantained with ratio.

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1 : 4

1 :3

1: 8

1 : 10

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

Which of the following gas protects us form harmful effect of uv radiation.

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SO2

NO2

CO

O3

Shows a regular increase on moving down the group form carbon to lead

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Atomic volume

Atomic radius

Density

All above

Covalent compound are soluble in

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Polar solvents

Non polar solvent

Concentrated acids

All solvent

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