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Current Affairs January 2024

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4

Physico-chemical characteristics of water in water sources undergo changes due to

A. aquatic macrophytes

B. aquatic fungi

C. effluents

D. evapotranspiration

Correct Answer :

A. aquatic macrophytes


Related Questions

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4

Which of the following is not a supporter of combustion?

A. Oxygen

B. Air

C. Hydrogen

D. Chlorine

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4

A hormone which contains iodine is

A. adrenalin

B. glucagon

C. epinephrin

D. thyroxin

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4

The gas used in balloons in the place of hydrogen is

A. nitrogen

B. helium

C. neon

D. argon

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In photography, the compound or nitrogen used is

A. Potassium nitrate

B. Silver nitrate

C. Ammonium carbonate

D. Ammonium bicarbonate

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4

Proteins are polymerisation products of

A. aldehydes

B. alkenes

C. amino acids

D. alkynes

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4

Gases have

A. a definite shape but not volume

B. a definite volume and shape

C. a definite volume but not shape

D. neither definite volume nor shape

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4

Colour blindness is

A. a congenital disease

B. a communicable disease

C. an acquired disease

D. a contagious disease

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4

The most abundant noble gas present in air is

A. neon

B. argon

C. helium

D. krypton

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4

In the nitrogen cycle, denitrifying bacteria

A. oxidise ammonia to nitrates

B. convert nitrogen into ammonia

C. oxidise ammonia to free nitrogen

D. oxidise ammonia to oxides of nitrogen

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4

Vinegar is an aqueous solution of

A. oxalic acid

B. citric acid

C. acetic acid

D. hydrochloric acid

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4

The addition of a neutron to the nucleus of an atom

A. increases the atomic mass of the atom

B. decreases the atomic mass of the atom

C. increases the charge on the nucleus

D. decreases the charge on the nucleus

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4

A compound used both as a fungicide and as a disinfectant is

A. chlorine

B. carbon monoxide

C. sulphur dioxide

D. o-cresol

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4

Which of the following is a regenerated fibre?

A. Terylene

B. Rayon

C. Nylon

D. Silk

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4

Galvanising is coating Iron with

A. nickel

B. zinc

C. chromium

D. copper

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4

Dust particles in the air of large industrial cities are removed by

A. Sedimentation

B. Electrophoresis

C. Tyndall effect

D. Brownian movement

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4

White vitriol is

A. ZnSO4 . 7H2O

B. FeSO4 . 7H2O

C. MgSO4 . 7H2O

D. CaSO4 . 2H2O

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4

The kinetic energy of gas molecules

A. is unaffected by temperature variations

B. decreases with increase of temperature

C. increases with decrease of temperature

D. increases with increase of temperature

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4

An important use of nitrous acid is in

A. the manufacture of explosives

B. the manufacture of dyes

C. refrigerators

D. the preparation of drugs

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4

Nylon is made from

A. terephthalic acid and ethylene glycol

B. hexamethylene diamine and adipic acid

C. cellulose nitrate

D. cellulose acetate

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4

Penicillin was discovered by

A. Alexander Fleming

B. Sir JJ Thomson

C. Dr Nessler

D. Sir John Russel

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4

The alloy added in the preparation of steel contains

A. Fe and C

B. Mn and C

C. Fe and Mn

D. Fe, Mn and C

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4

The percentage of silver in German silver is

A. ten

B. twenty

C. zero

D. fifty

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4

Stainless steel contains steel and

A. manganese

B. vanadium

C. nickel

D. chromium

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4

The depletion of the ozone layer in the upper atmosphere is due to -extensive use of

A. dichloro-phenoxy-acetic acid

B. superphosphate of lime

C. chlorofluorocarbons (CFC)

D. dichloro-diphenyl-trichloro-ethane

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4

Which of the following is an essential constituent of acids?

A. Oxygen

B. Nitrogen

C. Hydrogen

D. Chlorine

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4

The hormone which absorption is increases glucose oxidation and glucose

A. adrenalin

B. thyroxin

C. insulin

D. epinephrine

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4

Nitrous oxide used as anaesthetic is usually mixed with

A. ethyl alcohol

B. chloroform

C. oxygen

D. methyl alcohol

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4

Which one of the following is present in the largest amount in terms of per cent by mass in the earth's crust?

A. Silicon

B. Oxygen

C. Carbon

D. Calcium

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4

On chemical analysis, a bottle cork is found to contain primarily

A. proteins

B. carbohydrates

C. tannins

D. lipids

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4

Which or the following is not a constituent or gun powder?

A. Ammonium nitrate

B. Nitre

C. Charcoal powder

D. Sulphur