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Current Affairs January 2024

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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

Correct Answer :

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


Related Questions

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4

Addition of calcium oxide to water produces

A. Exothermic heat

B. Hissing sound

C. Slaked lime

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

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4

Sucrose is a

A. Monosaccharide

B. Disaccharide

C. Polysaccharide

D. None of these

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4

Phthalic anhydride is produced by the oxidation of

A. Naphthalene

B. Benzene

C. Toluene

D. Aniline

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4

Which glass is usually used in optical work?

A. Lead glass

B. High silica (borosilicate) glass

C. Photo-sensitive glass

D. Fibre glass

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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

Chemical formula of oleum is

A. H2SO3

B. H2SO4

C. H2S2O7

D. H2SO7

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4

Fumigant insecticides

A. Kill insects, when they eat it

B. Emit poisonous vapour

C. Are absorbed throughout the plant

D. None of these

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4

The manufacture of Kraft pulp is done by a/an __________ process.

A. Alkaline

B. Acidic

C. Neutral

D. None of these

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4

Polymethyl methacrylate (PMMA) is known as

A. Bakelite

B. Teflon

C. Perspex

D. Nylon-6

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4

Viscose rayon is chemically

A. Cellulose nitrate

B. Regenerated cellulose nitrate

C. Cellulose acetate

D. Regenerated cellulose acetate

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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

Zeolite removes both temporary as well as permanent hardness of water by precipitating calcium and magnesium present in water as insoluble zeolites. Used zeolite is regenerated by flushing with the solution of

A. Calcium sulphate

B. Sodium chloride

C. Sodium sulphate

D. Magnesium chloride

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4

Which of the following, when pyrolysed, produces Perchloroethylene?

A. Ethylene dichloride

B. Chlorobenzene

C. Carbon tetrachloride

D. Chlorinated paraffin

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4

Which of the following is the purest form of water out of the following?

A. Underground water

B. Rain water

C. Well water

D. Lake water

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4

Which of the following is not a product of coal tar distillation?

A. Anthracene

B. Creosote oil

C. Carbolic oil

D. None of these

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4

Oxidation of ortho-xylene in presence of __________ catalyst is done to produce phthalic anhydride on commercial scale.

A. Nickel

B. Vanadium

C. Alumina

D. Iron

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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

Cellulose percentage in bamboo fibre is about

A. 10

B. 20

C. 50

D. 85

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4

Conversion of CO to CO2 by steam in presence of a catalyst is called

A. Steam reforming

B. Shift conversion

C. Steam gasification

D. None of these

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4

Which of the following is an ore of iron?

A. Galena

B. Chalcopyrite

C. Hematite

D. Bauxite

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4

Low purity oxygen is used for

A. L.D. steel making

B. Cutting and welding of metals

C. Medicinal purposes

D. Chemical oxidation processes

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4

Sucrose content in cane sugar may be around __________ percent.

A. 50

B. 70

C. 95

D. 80

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4

Synthesis gas is a mixture of

A. CO and H2

B. N2 and H2

C. H2, CH4 and CO

D. CO2 and H2

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4

Pick out the wrong statement.

A. Catalytic hydrogenation of carbon monoxide produces methyl alcohol

B. In nylon-6, the number 6 represents the total number of carbon atoms in the ring

C. Raw materials for DDT manufacture are benzene and chlorine

D. Ethanolamines are produced by using ammonia and ethylene oxide as raw material

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4

Coagulant is used __________ filtration.

A. Before

B. After

C. During

D. To avoid

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4

Absorption of SO3 in 97% H2SO4 is

A. Exothermic

B. Endothermic

C. Not possible

D. None of these

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4

Oleum produces fumes of

A. SO2

B. H2SO4

C. SO3

D. SO2 + H2SO4

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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

Washing soda is chemically represented by

A. Na2CO3

B. Na2CO3.H2O

C. Na2CO3.10H2O

D. NaHCO3

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4

Enzymes are organic catalysts used in the __________ reactions.

A. Chemical

B. Biochemical

C. Photochemical

D. Electrochemical