Question # 1

Water pollution is due to

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Agricultural discharges

Swages and other wastes

Industrial effects

All the above

For each value of l. the number of m velocity are.

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n²

2l

(2l+1)

(n+1)

Helium is used for

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The preservation of food

Filling electrical transformer

Pressuring agent in rockets

All of above

Petroleum is formed from

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Domestic animal

Organisms in sea

Wild animals

All above

The boiling point of water is unexpectedly high because.

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H2O molecule in linear

Sp3 hydrogen bonding is involved in the formation of water

There is hydrogen bonding and consequent association of H2O molecules.

Oxygen is the first member of the VI group

Which of the following is not biological characteristics of water.

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COD

Animals

Plants

Viruses

Which of the following process involves the use fo organic compound as an electron acceptor.

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Aerobic respiration

Anaerobic respiration

Fermentation

Glycolsis

Group VII A of periodic table consist of elements.

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4

5

6

7

Estimation of nitrogen in proteins is generally arrived out by the method.

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Duma's method

Van Slyke method

Kjeldahl's method

Carius method

Pick out the incorrect statement about K2Cr2O7

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It is thermally stable

It dissolves in alkali to form chromate

It oxidizes acidified FeSO4 solution to Fe2(SO4)3

It is used as cleansing agent for glassware. etc. When mixed with cold con. H2SO4

Which of the following pollutant is not primary pollutant.

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Ash

Smoke

SO3

SO2

Which of the following is the cause of Brownian movement of colloidal particles.

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Convection currents int he fluid

Bombardment by the molecules of the dispersion medium

Setting of dispersed phase under gravity.

Thermal gradient in the medium

The constant temperature and pressure,the rates of effusion of various gases vary inversely as square root of their denature. This is a statement of.

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Boyle's law

Charles's law

Graham's law

Daltons's law

Plane polarized light is affected by

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Identical molecules

All polymers

Chiral molecules

All biomolecules

Which is not true about polymers.

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Polymers do not carry any charge

Polymers have high viscosity

Polymers scatter light

Polymers have low molecular weight

Which of the following instruments is used to measure the optical activity.

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Refractometer

Conductivity meter

Polarimeter

Torsion meter

Which of the following expressions represent the equivalent conductance.

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A = l s x 1000/V

A = Ls x 1000/C

A = Ls l/A

A = Ls/V

What is the most common alloying ingredient in copper?

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Brass

Zinc

Cobalt

Nickle

Phosphorus is detected by fusing the organic compound with -------followed by extraction with H2O

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HNO3

H2SO4

Sodium per oxide

Ozone

Citral when heated with KHSO4 forms.

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Isoprene

p-cymene

p-menthane

Dipentene

The main active contaminants of uranium processing are.

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U - 235

U-238

Pu -234

All above

Which of the following statement is not correct with respect to radioactive pollutnats.

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Carcinoma and breast cancer

Leukemia

Increases biological immune system

Somatic and generic disorder

The velocity possessed by maximum fraction of molecules at a given temperature is called.

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Average velocity

Root mean aquare velocity

Most probable velocity

None of the above

The ionization potential of K would be numerically equal to.

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Electron affinity of Ar

Electromagnetically of K

Electron affinity of K+

ionization energy of Ca

The element with atomic numebr greater than 100 are known as

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Trans uranium elements

Trans fermium elements

Actinides

Lanthanides

A group that causes deepning of the colour is known as

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Bathchromic

Hypsochromic

Hypochromic

Hyperchromic

Isotopes are atoms whom nuclei have the same atomic number but different mass numbers. A specific isotope has an atomic number of 18 and a mass number of 35. How many electrons are there in the neutral atom.

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17

18

34

35

Example of inter molecular H-bonding is

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NH3 and H2O

HF

CH3COOH

All of abvoe

As it passes into food chain, the concentration of DDT

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Remains same

Decreases

Increases

Unpredictable

Which of the following molecules have centre of symmetry.

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H2O

HCl

CO2

H2SO4

Among oxides of nitrogen all are gases except.

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N2O5

N2O

NO

N2O3

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