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Current Affairs January 2024

What is the correct answer?

4

Percentage of glycerine present in the spent lye obtained during soap manufacture is about

A. 0.5

B. 5

C. 20

D. 35

Correct Answer :

B. 5


Related Questions

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4

More than 100 percent of __________ is present in oleum.

A. SO3

B. H2SO4

C. H2SO3

D. SO2

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4

Which allotrope of sulphur is insoluble in carbon disulphide?

A. Rhombic sulphur

B. Monoclinic sulphur

C. Plastic sulphur

D. Milk of sulphur

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4

Boiling of water containing temporary hardness produces

A. CO2

B. CaSO4

C. CaHCO3

D. None of these

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4

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

A. Osmosis

B. Reverse osmosis

C. Absorption

D. Adsorption

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4

The process involved in converting rubber into a thin sheet or coating it on fabric is called

A. Extrusion

B. Mastication

C. Calendaring

D. Vulcanisation

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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

Alum is commercially produced from

A. Gypsum

B. Feldspar

C. Galena

D. Bauxite

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4

Acrylonitrile is mainly used in the __________ industry.

A. Polymer

B. Printing

C. Dyeing

D. Photographic

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4

Main constituents of natural rubber is

A. Polystyrene

B. Polyisoprene

C. Polybutadiene

D. Polychlorophrene

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4

Catalytic oxidation-dehydrogenation of methyl alcohol produces

A. Formaldehyde

B. Phenol

C. Acetone

D. Maleic anhydride

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4

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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4

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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4

Plasticisers are added to synthetic plastics to

A. Impart flexibility

B. Improve workability during fabrication

C. Develop new improved properties not present in the original resins

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

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4

Portland cement consists mainly of

A. CaO & SiO2

B. SiO2 & Al2O3

C. CaO & Al2O3

D. CaO & Fe2O3

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4

Starting material for the commercial production of ethyl alcohol in India is

A. Rice

B. Molasses

C. Fruit of Mahua tree

D. Maize

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4

Margarine is a/an

A. Fat

B. Explosive

C. Plasticiser

D. Rocket propellant

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4

Pick out the wrong statement pertaining to the properties of glasses. Glasses generally have

A. High electrical insulation properties

B. Sharp melting points

C. Low co-efficient of thermal expansion

D. Compressive strength much greater than their tensile strengths

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4

Flexible foam (for mattresses) is usually made of

A. PVC

B. Silicone

C. Polyurethanes

D. Polyamides

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4

Sulphuric acid saturated with SO3 is called

A. Concentrated H2SO4

B. Sulphurous acid

C. Oleum

D. None of these

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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

One of the steps during refining of cane sugar consists of addition of hydrated lime to the sugar syrup followed by carbonation of the resulting solution. The purpose of this step is to

A. Adjust the pH of the syrup

B. Remove the coloring matter from the syrup

C. Reduce the viscosity of the syrup

D. Improve the rate of crystallisation of sugar

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4

Massecuite is

A. Used for paper making

B. Used as a cattle feed

C. Highly acidic in nature

D. None of these

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4

The most widely used coagulant for removing suspended impurities from water is

A. Bleaching powder

B. Chlorine

C. Calcium sulphate

D. Alum

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4

Oxygen is separated by distillation from air after its liquefaction. The boiling point of oxygen is about __________ °C.

A. -83

B. -183

C. -196

D. -218

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4

High magnesia lime is added to hot sugar cane juice (during the manufacture of sugar) to

A. Flocculate the impurities

B. Facilitate fast filtration

C. Both (A) and (B)

D. Neither (A) nor (B)

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4

Phenol formaldehyde resin is used as an adhesive in making

A. Laminates

B. Card boxes

C. Furniture

D. Books

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4

Chloramines are used in water treatment for

A. Disinfection and control of taste & odour

B. Corrosion control

C. Removing turbidity

D. Control of bacteria

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4

The noble gas which occurs most abundantly in the atmosphere is

A. Helium

B. Neon

C. Krypton

D. Argon

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4

20% oleum means that in 100 kg oleum, there are 20 kg of

A. SO3 and 80kg of H2SO4

B. H2SO4 and 80kg of SO3

C. SO3 for each 100 kg of H2SO4

D. None of these

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4

Main constituent of limestone is

A. CaCO3

B. MgCO3

C. Na2CO3

D. CaSO4