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Current Affairs January 2024

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Separation of fresh water from sea water can be done by the __________ operation.

A. Osmosis

B. Reverse osmosis

C. Absorption

D. Adsorption

Correct Answer :

B. Reverse osmosis


Related Questions

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Which catalyst is used in the manufacture of ethylene oxide by oxidation of ethylene?

A. AgO

B. Al2O3

C. ZnCl2

D. Fe2O3

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Hard water

A. Does not affect the lather formation by soap

B. Is not unfit for drinking purpose

C. Pollutes the water stream

D. All (A), (B) and (C)

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Shrinkage volume in cement setting does not depend upon the

A. Sand to cement ratio

B. Water to cement ratio

C. Ambient temperature fluctuation

D. Drying period

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Trinitro-toluene (TNT) is

A. Used in glycerine manufacture

B. An explosive

C. Used in dye manufacture

D. None of these

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__________ Nature of hypo (sodium thiosulphate) makes it useful in photography.

A. Oxidising

B. Reducing

C. Complex forming

D. Photochemical

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Poly Tetrafluoroethylene (P.T.F.E.) is known as

A. Bakelite

B. Teflon

C. Celluloid

D. Dacron

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Bleaching of paper pulp is done with

A. Activated clay

B. Bromine

C. Chlorine or chlorine dioxide

D. Magnesium sulphite

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Which of the following processes does not produce Cl2 as a co-product during the manufacture of caustic soda?

A. Diaphragm electrolytic cell process

B. Mercury electrolytic cell process

C. Lime-soda process

D. None of these

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Nylon-66 is so named because the

A. Average degree of polymerisation of the polymer is 1966

B. Number of carbon atoms between two nitrogen atoms are 6

C. Number of nitrogen atoms between two carbon atoms are 6

D. Polymer was first synthesised in 1966

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Which of the following is not a food additive?

A. Citric acid

B. Invertage

C. Benzoyl peroxide

D. Ammonium chloride

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Reaction of calcium carbide with water produces a gas, which is used

A. As an illuminant

B. For metal cutting/welding

C. Both (A) & (B)

D. Neither (A) nor (B)

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Catalytic oxidation of naphthalene produces

A. Styrene

B. Phenol

C. Phthalic anhydride

D. None of these

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Fermentator temperature during production of alcohol from molasses is around __________ °C.

A. 5

B. 30

C. 130

D. 300

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In contact process, SO3 is absorbed in 97% H2SO4 and not in water, because

A. SO3 gas is sparingly soluble in water

B. Water forms an acid mist, which is difficult to absorb

C. The purity of acid is affected

D. Scale formation in the absorber is to be avoided

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Fourdrinier machine is used in the manufacture of

A. Nylon-6

B. Paper

C. Antibiotics

D. Sugar

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Trinitrotoluene (TNT), an explosive, is made by the nitration of

A. Nitrobenzene

B. Toluene

C. Nitrotoluene

D. Benzene

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Sulphur removal by heating of pyrite ore in presence of air is called its

A. Reduction

B. Roasting

C. Calcination

D. Smelting

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Exothermic condensation reaction of monochlorobenzene with chloral in presence of 20% oleum as catalyst produces DDT. The reaction temperature is maintained at __________ °C.

A. 15-30

B. 90-100

C. 250-300

D. < 0

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Calcination of limestone is not done in a __________ kiln for producing lime.

A. Vertical shaft

B. Rotary

C. Fluidised bed

D. Fixed bed

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Platinum catalyst used in the earlier days of sulphuric acid manufacture by contact process suffers from the drawback like

A. High cost

B. Fragile nature

C. Easy poisoning tendency

D. All (A), (B) and (C)

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Transparent soaps (e.g. Pears) are

A. Usually soft soap (made from coconut oil) in which cane sugar & alcohol are added and finally washed with methylated spirit to achieve transparency

B. Metallic soaps with frothing agent and free Stearic acid to achieve transparency

C. Metallic soaps with frothing agent from which glycerine has not been recovered

D. None of these

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Use of water having dissolved oxygen in boilers promotes

A. Corrosion

B. Sequestration

C. Scale formation

D. None of these

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Pick out the wrong statement.

A. Strongly caking coal should not be used in the Lurgi gasifier

B. Acetylene gas cannot be used for illumination purpose

C. Water gas is called blue gas because of the color of the flame, when it is burnt

D. Gaseous fuels require less percentage of excess air for combustion as compared to liquid fuels

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Economics of 'Solvay Process' depends upon the efficiency of

A. Carbonating tower

B. Ammonia recovery

C. Ammonia recovery and size of the plant

D. Ammoniation of salt solution

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A 'unit process' is exemplified by the

A. Distillation

B. Hydrogenation of oils

C. Absorption

D. Humidification

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Sulphuric acid completely saturated with sulphur trioxide is called

A. Concentrated sulphuric acid

B. Oleum

C. Sulphurous acid

D. Dilute sulphuric acid

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Fusel oil is a/an

A. Essential oil

B. Extract from medicinal herbs

C. Mixture of higher molecular weight alcohols (a by-product obtained during production of alcohol from molasses).

D. None of these

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Lurgi coal gasifier is a pressurised __________ bed reactor.

A. Moving

B. Fixed

C. Fluidised

D. Entrained

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The amount of benzene present in pure Benzol is about __________ percent.

A. 30

B. 50

C. 70

D. 90

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Antibiotic

A. Inhibits/destroys the growth of microorganisms

B. Is used as a pain reliever

C. Is an antimalarial

D. Is an anaesthetic