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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

Hard water does not lather well with soap because

A. it contains carbonates of calcium and magnesium

B. it contains sodium chloride

C. it is highly coloured

D. it contains suspended impurities

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4

The malarial parasite was discovered by

A. Sir Ronald Ross

B. Sir Francis Haig

C. Dr Jagadish Chandra Bose

D. Sir CV Raman

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4

A substance used both as an explosive and as a germicide is

A. phenol

B. TNT

C. picric acid

D. iodoform

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4

When ants bite, they inject

A. glacial acetic acid

B. methanol

C. formic acid

D. stearic acid

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4

The vitamin that is found in citrus fruits such as lemon and orange is

A. vitamin C

B. vitamin B2

C. vitamin A

D. vitamin E

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4

A mixture of naphthalene and sand is separated by

A. evaporation

B. using a magnet

C. sublimation

D. sedimentation

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4

Lead soaps are used in

A. shaving creams

B. adhesive tapes

C. toilet powders

D. lubricants

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4

One of the ingredients of the paste on the side of a match box is

A. phosphorus pentaoxide

B. phosphorus trichloride

C. phosphorus trisulphide

D. phosphorus trioxide

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4

Invert sugar is

A. sucrose

B. glucose

C. fructose

D. a mixture of glucose and fructose

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4

Which of the following types of water gives lather easily with soap?

A. Hard water

B. Heavy water

C. Soft water

D. Both (a) and (b)

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4

Which of the following cannot be used for the preparation of soap?

A. oleic acid

B. acetic acid

C. palmitic acid

D. stearic acid

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4

Coke is a substance obtained

A. from coal mines

B. when wood is burnt in excess of air

C. by heating coal out of contact with air

D. by heating wood out to contact with air

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4

Which of the following is used as an illuminant?

A. Gasoline

B. Benzoline

C. Kerosene

D. Petroleum ether

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4

Concrete is a mixture of

A. cement an limestone

B. cement and sand

C. cement and gravel

D. cement, sand and gravel

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4

In addition to nitric acid, another acid which may render iron passive is

A. acetic acid

B. oxalic acid

C. chromic acid

D. citric acid

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4

Which of the following is not a chemical change?

A. Burning of magnesium ribbon in air

B. Distillation of water

C. Heating of cane sugar

D. Setting of cement

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4

A substance used as a fire-extinguisher under the trade name of Pyrene is

A. carbon dioxide

B. chloroform

C. carbon tetrachloride

D. bleaching powder

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4

The artificial silk produced from cellulose is

A. Polyethylene

B. Nylon

C. Terylene

D. Rayon

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4

PAS is a drug used In the treatment of

A. tuberculosis

B. cancer

C. typhoid

D. malaria

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4

The non-metal which has a shining appearance is

A. sulphur

B. phosphorus

C. iodine

D. bromine

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4

Which of the following is used as a food preservative?

A. phenol

B. washing soda

C. absolute alcohol

D. vinegar

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4

Cholesterol is

A. a carbohydrate

B. a protein

C. a lipid

D. a hormone

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4

The alloy which is extremely hard and resistant to acids is

A. chrome steel

B. silicon steel

C. stainless steel

D. invar

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4

Calomel is

A. lead chloride

B. mercurous chloride

C. mercuric chloride

D. calcium sulphate

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4

Oxalic acid is used in the manufacture of

A. tincture iodine

B. paints

C. ink

D. aerated water

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4

In the making of jewels, gold is usually mixed with

A. zinc

B. tin

C. copper

D. aluminium

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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

An element which is preserved under water is

A. Sodium

B. red phosphorus

C. white phosphorus

D. sulphur

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4

The rate of setting of cement is slowed down by the addition of

A. quicklime

B. gypsum

C. soda lime

D. bleaching powder

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4

Which of the following metals is the best conductor of heat and electricity?

A. Aluminium

B. Silver

C. Copper

D. Magnesium