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Current Affairs January 2024

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4

Presence of carbonaceous matter in the sewage

A. Causes reduction in its dissolved oxygen content thereby endangering the life of aquatic creatures

B. Reduces sulphate ions to sulphides causing obnoxious smell

C. Increases the quantity of chlorine used for its purification

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

Correct Answer :

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


Related Questions

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Catalyst used during the manufacture of 'Vanaspati Ghee' is

A. Zinc

B. Nickel

C. Platinum

D. Copper

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Phenol formaldehyde

A. Employs addition polymerisation

B. Employs condensation polymerisation

C. Is a monomer

D. Is an abrasive material

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The main use of HCl is in the

A. Drilling of petroleum wells and pickling of steel sheets

B. Manufacture of cationic detergent

C. Treatment of spent fuel of nuclear reactor

D. None of these

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CaSO4 . ½H2O is known as

A. Blue vitriol

B. Plaster of Paris

C. Gypsum

D. Zeolite

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Heating of __________ to 120°C, produces plaster of paris.

A. Blue vitriol

B. Gypsum

C. Calcium silicate

D. Calcium sulphate

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Flux addition during smelting of ore is done to

A. Remove impurities/gangue

B. Enhance rate of reaction

C. Accelerate reduction of ore

D. Separate slag from metal

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Commonly used glass is known as the __________ glass.

A. Flint

B. Hard

C. Pyrex

D. Soda

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Hollander beater used during paper pulp manufacture does not facilitate the __________ of fibre.

A. Cutting

B. Fibrillation

C. Hydration

D. Strengthening

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Esterification reaction produces

A. Detergent

B. Vanaspati

C. Soap

D. Mercaptans

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Carboxymethyl cellulose (CMC) is added in detergents to

A. Prevent redeposition of soil on cleaned surface

B. Act as optical brightening agent

C. Inhibit corrosion in washing machines made of aluminium

D. None of these

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4

__________ process is used for the manufacture of sodium carbonate by ammonia soda process.

A. Ostwald's

B. Bosch

C. Solvay

D. Haber's

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Dehydrogenation of Isopropanol produces

A. Propyl alcohol

B. Acetone

C. Trichloroethylene

D. Formaldehyde

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Ethylene oxide is produced by oxidation of ethylene in presence of AgO catalyst at

A. 1 atm & 100°C

B. 5 atm & 275°C

C. 100 atm & 500°C

D. 50 atm & 1000°C

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Hydrogenation of oil takes place in a/an __________ reactor.

A. Autothermal

B. Trickle bed

C. Plug flow

D. None of these

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Styrene-butadiene-rubber (SBR) as compared to natural rubber has

A. Poorer tensile strength

B. Poorer resistance to oxidation

C. Greater amount of heat build-up under heavy loading

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

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Main constituents of Portland cement are calcium aluminate and

A. Gypsum

B. Silicates

C. Sodium silicate

D. Carbonates

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Viscosity index improver (like polystyrene or polyisobutylene) is added to lubricant to

A. Reduce its viscosity

B. Increase its viscosity

C. Reduce the variation in its viscosity with temperature

D. Increase the variation in its viscosity with temperature

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Zeolite used in water softening process (cation exchange) is regenerated by washing with

A. Brine

B. Chloramines

C. Sodium bisulphite

D. Liquid chlorines

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__________ is used as a flux in the smelting of copper ore like chalcopyrite.

A. Coke breeze

B. Lime powder

C. Silica/quartz

D. Dolomite

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Sea water contains about __________ ppm of bromine.

A. 5

B. 70

C. 500

D. 1700

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The type of high refractive index glass used in optical instruments is __________ glass.

A. Pyrex

B. Flint

C. Crookes

D. None of these

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Which oil is preferred for paint manufacture?

A. Drying oil

B. Non-drying oil

C. Semi-drying oil

D. Saturated oil

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Main use of hydrazine is

A. As a rocket fuel

B. In water treatment

C. As a disinfectant

D. As fire retardant

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The ideal pulp for the manufacture of paper should have high __________ content.

A. Cellulose

B. Lignin

C. Both (A) & (B)

D. None of these

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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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Glycerine is not used in the

A. Manufacture of explosive

B. Conditioning and humidification of tobacco

C. Manufacture of pharmaceuticals

D. None of these

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Oils and fats are converted to soap in a process called

A. Hydrogenation

B. Esterification

C. Saponification

D. None of these

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Which of the following is an ore of iron?

A. Galena

B. Chalcopyrite

C. Hematite

D. Bauxite

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In the manufacture of H2SO4, vanadium catalyst as compared to platinum catalyst

A. Gives higher conversion efficiency

B. Has a longer life and is not poisoned by arsenic

C. Handles lower SO2 content gas (7 -10% SO2), thus increasing the capital cost of the plant

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

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Pick out the wrong statement.

A. Eosin requirement in tallow soap is about 40-50% which fastens the lather formation, softens the hard soaps and increases its cleansing action

B. Soap powder is prepared by mixing soap with hydrated sodium carbonate

C. Detergents differ from soaps in their action in hard water

D. Tarnish inhibitor (e.g., Benzotriazole) is added in soap to facilitate the removal of stains due to tea, blood etc