Home
Current Affairs January 2024

What is the correct answer?

4

Liquefaction of gases cannot be done by

A. Exchange of heat with colder stream

B. Adiabatic expansion through a throttle valve (Joule-Thomson expansion)

C. Merely compressing it beyond critical pressure

D. Adiabatic expansion against a piston or in a turbine

Correct Answer :

C. Merely compressing it beyond critical pressure


Related Questions

What is the correct answer?

4

Thorium is mainly used

A. For the manufacture of gas mantles

B. As a fissile fuel in a nuclear reactor

C. In the manufacture of hydrogen bomb

D. In the treatment of cancer

What is the correct answer?

4

Platinum is a versatile catalyst for many processes in chemical industries. It is highly prone to be poisoned by the presence of

A. Carbon

B. Arsenic

C. Lead

D. Sulphur

What is the correct answer?

4

Which of the following is not produced on commercial scale from sea water?

A. Bromine

B. Magnesium compounds

C. Potassium compounds

D. Sodium sulphate

What is the correct answer?

4

Which one of the following is not an elastomer?

A. Polyisoprene

B. Neoprene

C. Nitrile-butadiene

D. None of these

What is the correct answer?

4

Phenolic antiseptics are added in the __________ soap.

A. Shaving

B. Medicated

C. Metallic

D. Transparent

What is the correct answer?

4

Glycerine can be obtained from

A. Fat

B. Naphthalene

C. Cumene

D. Sucrose

What is the correct answer?

4

Which of the following is not required in the manufacture of soda ash by Solvay process?

A. Ammonia

B. Limestone

C. Nitric acid

D. None of these

What is the correct answer?

4

Sea weeds are an important source of

A. Fluorine

B. Chlorine

C. Bromine

D. Iodine

What is the correct answer?

4

All enzymes are made of

A. Fats

B. Carbohydrates

C. Proteins

D. Amino acids

What is the correct answer?

4

The catalyst used in the production of elemental sulphur from H2S (by oxidation-reduction) is

A. Alumina

B. Silica gel

C. Platinum

D. Nickel

What is the correct answer?

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

What is the correct answer?

4

Which of the following is not an antibiotic?

A. Penicillin

B. Streptomycin

C. Tetracycline

D. Quinine

What is the correct answer?

4

Rotary kiln is not involved in the production of

A. Cement

B. Lime from limestone

C. Slaked lime from quick lime

D. None of these

What is the correct answer?

4

Producer gas consists mainly of

A. CO, CO2 N2, H2

B. CO, H2

C. H2, CH4

D. C2H2, CO2, H2

What is the correct answer?

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

What is the correct answer?

4

Catalyst used in the oxidation of benzene to produce Maleic anhydride is

A. V2O5

B. Pt

C. Ni

D. Cr

What is the correct answer?

4

During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as

A. It is very corrosive at elevated temperature

B. Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)

C. It decomposes on further increasing the temperature

D. None of these

What is the correct answer?

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

What is the correct answer?

4

Drinking (potable) water treatment does not involve

A. Coagulation

B. Sedimentation

C. Softening

D. Disinfection

What is the correct answer?

4

CO & H2 are the constituents of

A. Producer gas

B. Water gas

C. Coke oven gas

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

What is the correct answer?

4

Pick out the wrong statement.

A. Kraft method of pulp manufacture can process all types of fibrous raw materials

B. Digestion time for bagasse is less than that for wood base materials

C. Both temperature and pressure in the digestor is less in case of the sulphite method as compared to that in the sulphate method

D. None of these

What is the correct answer?

4

Hydrochloric acid is also known as

A. Oil of vitriol

B. Muriatic acid

C. Strong organic acid

D. Green acid

What is the correct answer?

4

Fluorescent dyes are added in detergents to

A. Act as fabric brightener (by converting ultraviolet light to visible light) thereby improving the whiteness appearance of white fabrics

B. Attain distinctiveness from other brands

C. Act as tarnish inhibitor for metals like German silver

D. None of these

What is the correct answer?

4

Catalytic oxidation of naphthalene produces

A. Styrene

B. Phenol

C. Phthalic anhydride

D. None of these

What is the correct answer?

4

Cellulose content of bamboo and ideal fibrous raw material for the manufacture of paper is __________ percent.

A. 10

B. 50

C. 80

D. 95

What is the correct answer?

4

Bakelite is chemically known as

A. Polyvinyl chloride (PVC)

B. Polybutadiene

C. Phenol formaldehyde

D. Polyurethane

What is the correct answer?

4

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

A. Rice

B. Molasses

C. Fruit of Mahua tree

D. Maize

What is the correct answer?

4

Calcination of limestone is not done in a __________ kiln for producing lime.

A. Vertical shaft

B. Rotary

C. Fluidised bed

D. Fixed bed

What is the correct answer?

4

Systemic insecticides

A. Are absorbed throughout the plant

B. Kill insects following external bodily contact

C. Are stomach poisons

D. Emit poisonous vapour

What is the correct answer?

4

Graphite is a/an

A. Electrical insulator

B. Allotrope of carbon

C. Moderator used in nuclear reactor

D. Both (B) and (C)