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Current Affairs January 2024

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4

Neoprene is chemically known as

A. Polybutadiene

B. Styrene butadiene rubber (SBR)

C. Polyurethane

D. Polychlorophrene

Correct Answer :

D. Polychlorophrene


Related Questions

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4

Sudden temperature fluctuation does not affect pyrex glass, because of its

A. Low co-efficient of expansion

B. High co-efficient of expansion

C. High melting point

D. Both (B) and (C)

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4

High temperature carbonisation of coal produces

A. Inferior coke compared to low temperature carbonisation

B. Less of gases compared to liquid products

C. Larger quantity of tar compared to low temperature carbonisation

D. None of these

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4

Double Contact Double Absorption (DCDA) process is the most recent process for the manufacture of

A. Nitric acid

B. Sulphuric acid

C. Ammonium sulphate

D. Hydrochloric acid

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4

Pick out the wrong statement. Iodine value of an oil or fat is

A. The number of grams of iodine taken up by 100 gm of oil or fat

B. A measure of its unsaturation

C. Helpful in findings its adulteration & its suitability for making soap

D. Independent of the type of oil, whether it is drying or non-drying

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4

Silicon carbide is a/an

A. Adhesive

B. Abrasive

C. Type of glass

D. Brittle material

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4

Commercial scale production of hydrogen from iron-steam reaction represented by, 3Fe + 3H2O = Fe3O4 + 4H2, is not practised, as it is

A. A slow reaction

B. A discontinuous reaction (requiring regeneration of iron by water gas intermittently)

C. Still in development stage (by employing fluidised bed technique)

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

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4

Insulin is an __________ drug.

A. Anti-malarial

B. Anti-TB

C. Antibiotic

D. None of these

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4

Teflon is

A. Phenol formaldehyde

B. An inorganic polymer

C. Poly tetra-fluoro-ethylene (P.T.F.E.)

D. A monomer

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4

Reaction of an alcohol with organic acid is called the __________ reaction.

A. Saponification

B. Esterification

C. Neutralisation

D. Acidification

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4

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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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

__________ are added in lacquers to remove film brittleness and to improve adhereness.

A. Film forming materials

B. Plasticisers

C. Diluents

D. Solvents

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4

The basic difference between vegetable oils and fats is in their

A. Density

B. Chemical properties

C. Physical state

D. Composition

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4

Catalyst used in the manufacture of sulphuric acid by chamber & contact processes are respectively

A. V2O5 & Cr2O3.

B. Oxides of nitrogen & Cr2O3

C. V2O5 on a porous carrier & oxides of nitrogen

D. Oxides of nitrogen & V2O5 on a porous carrier

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4

Brackish water which contains mostly dissolved salt, can be purified by the __________ process.

A. Reverse osmosis

B. Sand filter

C. Lime soda

D. Permutit

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4

The yield of tar from high temperature carbonisation of dry coal is about __________ percent.

A. 3

B. 12

C. 22

D. 0.3

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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

Magnesium and calcium __________ cause temporary hardness of water.

A. Carbonates

B. Bicarbonates

C. Phosphates

D. Sulphates

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4

Styrene is produced from ethyl benzene by the process of

A. Dehydrogenation

B. Oxidation

C. Alkylation

D. Dehydration

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4

Which of the following contains least amount of N2?

A. Coke oven gas

B. Blast furnace gas

C. Producer gas

D. Water gas (blue gas)

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4

__________ is produced using Polycondensation reaction.

A. Polythene

B. Phenol formaldehyde

C. Poly vinyl chloride

D. None of these

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4

Vulcanisation of rubber

A. Decreases its tensile strength

B. Increases its ozone & oxygen reactivity

C. Increases its oil & solvent resistance

D. Converts its plasticity into elasticity

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4

Pick out the wrong statement.

A. High early strength cement are made from materials having high silica to lime ratio

B. The function of gypsum in cement is to enhance its initial setting rate

C. Acid resistant cements are known as silicate cement

D. Major component of greyish Portland cement is tricalcium silicate

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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

__________ of rubber decreases after its vulcanisation.

A. Resistance to the action of organic solvent

B. Tackiness

C. Maximum service temperature

D. Tensile strength

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4

Alcohol percentage in molasses may be around

A. 10

B. 40

C. 70

D. 85

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4

Catalytic oxidation of toluene produces

A. Styrene

B. Phenol

C. Benzene

D. Tri-nitro-toluene

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4

Which of the following is a disaccharide?

A. Sucrose

B. Glucose

C. Starch

D. Maltose

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4

Electro deposition of metals i.e. electroplating is never done on

A. Metals

B. Alloys

C. Refractories

D. Non-metals

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4

Chemical formula of 'salt cake' is

A. Na2SO4

B. CaSO4

C. MgSO4

D. BaSO4