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Current Affairs January 2024

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4

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

Correct Answer :

C. Reduce the variation in its viscosity with temperature


Related Questions

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4

Highly porous refractory bricks are

A. Less susceptible to chemical attack by molten fluxes and gases etc

B. Very strong

C. Having very high thermal conductivity

D. None of these

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4

Temporary hardness of water can be removed by

A. Addition of alum (a coagulant)

B. Boiling

C. Filtration (through gravity sand filter)

D. Addition of lime

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4

Coloured glass is obtained by mixing of colored salts. Addition of __________ oxide is done to impart greenish blue color to the glass.

A. Chromium

B. Arsenic

C. Copper

D. Manganese

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4

Viscose rayon

A. Cannot be made from sulphite pulp

B. Utilises H2SO4, NaOH and CS2 during its manufacture

C. Cannot yield textile grade fibre

D. None of these

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4

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

A. Oxidising

B. Reducing

C. Complex forming

D. Photochemical

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4

Alcohol content in freshly prepared natural and fortified wine may be respectively around __________ percent.

A. 7-14 and 14-30

B. 7-14 and 40-50

C. 14 - 30 and 40-50

D. 10 - 20 and 40 - 50

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4

Raw material used in alcohol distilleries in India is

A. Molasses

B. Benzol

C. Methylated spirit

D. None of these

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4

The major constituent of black liquor generated during paper manufacture is sodium

A. Sulphate

B. Carbonate

C. Hydroxide

D. Bi-carbonate

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4

Wet chlorine gas produced during electrolysis of brine is dehydrated by

A. Spraying 66° Be H2SO4 counter current to the flow of the gas

B. Passing it through a bed of diatomaceous earth

C. Passing it through a bed of silica gel

D. None of these

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4

Which of the following processes can remove both temporary as well as permanent hardness of water?

A. Filtration

B. Boiling

C. Distillation

D. None of these

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4

Glycerine can be obtained from

A. Fat

B. Naphthalene

C. Cumene

D. Sucrose

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4

Pick out the wrong statement.

A. Chamber process of sulphuric acid manufacture produces pure acid of concentration < 80%

B. Contact process of sulphuric acid manufacture produces pure acid of concentration ≥ 98%

C. 75% oleum can be produced by distillation of 20% oleum

D. Contact process of sulphuric acid manufacture uses nickel as the catalyst

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4

Bromine is used in the preparation of

A. Fire extinguishing compounds

B. Fire proofing agents

C. Dyes and antiknock compounds

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

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4

__________ process is used for the commercial production of nitric acid by the catalytic oxidation of ammonia.

A. Solvay

B. Ostwald's

C. Haber's

D. None of these

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4

Neon gas is

A. Flammable in nature

B. Used in color discharge tube

C. Filled in lamps having tungsten filament

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

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4

Zeolite is a/an

A. Naturally occuring clay which is capable of exchanging cations

B. Abrasive material

C. Catalyst used in shift conversion

D. None of these

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4

Vegetable oils contain large quantity of glycerides of unsaturated acids. When the vegetable oils contain high amount of saturated fatty acids, it is termed as __________ oil.

A. Drying

B. Semi-drying

C. Non-drying

D. None of these

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4

Vinyl chloride (CH2 = CH.Cl) is produced by the thermal pyrolysis of ethylene dichloride at a pressure & temperature of

A. 4 kgf/cm2 & 500°C

B. 10 kgf/cm2 & 1000°C

C. 40 kg/cm2 & 200°C

D. 100 kgf/cm2 & 500°C

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4

Free alkali in a toilet soap is __________ that in a laundry shop.

A. Less than

B. More than

C. Same

D. None of these

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4

Fatty material used in soap making is

A. Fatty acid

B. Fatty alcohols

C. Tallow

D. Detergents

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4

Chloral is used in the manufacture of

A. DDT

B. BHC

C. Parathion

D. None of these

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4

The purpose of adding Na2CO3 to water of low alkalinity is to

A. Permit the use of alum as a coagulant

B. Increase the softening capacity of zeolite

C. Facilitate easy regeneration of zeolite

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

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4

Most widely and commonly used coagulant for the removal of suspended impurities in water is

A. Bleaching powder

B. Slaked lime

C. Alum

D. Copper sulphate

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4

Graphite is a/an

A. Electrical insulator

B. Allotrope of carbon

C. Moderator used in nuclear reactor

D. Both (B) and (C)

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4

All enzymes are made of

A. Fats

B. Carbohydrates

C. Proteins

D. Amino acids

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4

Pick out the wrong statement.

A. Pasteurisation of milk involves moderate heating followed by cooling

B. Bakeries and breweries make use of yeasts

C. Enzyme is a complex nitrogenous compound

D. Oils and fats are alkaloids

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4

Caprolactam (a raw material for nylon-6 manufacture) is produced from

A. Phenol

B. Naphthalene

C. Benzene

D. Pyridine

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4

Ethyl alcohol cannot be produced

A. From waste sulphite substrate of paper mills

B. By Esterification and hydrolysis of ethylene

C. From molasses

D. None of these

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4

Penicillin is made employing __________ fermentation process.

A. Continuous

B. Aerobic batch

C. Anaerobic batch

D. None of these

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4

Which of the following is not an insecticide?

A. Hydrocyanic acid

B. Nicotine

C. Sodium fluoride

D. Hexane