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Current Affairs January 2024

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4

Graphite la a good conductor of electricity because

A. it is an allotrope of carbon

B. it gives CO2 on heating

C. it contains free electrons

D. it is oxidised to graphitic acid

Correct Answer :

C. it contains free electrons


Related Questions

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Chloroform used as anaesthetic should be preserved In the dark in tightly stoppered bottles because otherwise

A. it becomes coloured

B. it gets evaporated in air

C. it gets oxidised to phosgene

D. it gets decomposed to chloropicrin

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4

The compound of iron used in the manufacture of blue-black ink is

A. ferric chloride

B. ferric sulphate

C. ferric thiocyanate

D. ferrous sulphate

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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

Nitrous oxide used as anaesthetic is usually mixed with

A. ethyl alcohol

B. chloroform

C. oxygen

D. methyl alcohol

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4

The neutron was discovered by

A. Chadwick

B. Madam Curie

C. Becquerel

D. Aston

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4

Diamonds are weighed in

A. grams

B. pounds

C. carats

D. tons

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4

Beri-beri is caused by deficiency of Vitamin

A. A

B. C

C. B12

D. B1

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4

Consider the following statements: Hard water is not suitable for
1) drinking
2) washing clothes with soap
3) use in boilers
4) irrigating crops
Which of these statements are correct?

A. 1 and 3

B. 2 and 3

C. 1, 2 and 4

D. 1, 2, 3 and 4

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4

Real gases tend to become ideal Under

A. low pressure and high temperature

B. low pressure and low temperature

C. high pressure and low temperature

D. high pressure and high temperature

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4

Bordeaux mixture contains

A. copper sulphate and water

B. copper sulphate, lime and water

C. thio-urea and lime

D. copper sulphate and thio-urea

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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

Which is the 'odd man' in the following?

A. brass

B. common salt

C. cane sugar

D. water

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Copper is purified by

A. poling

B. tempering

C. calcination

D. galvanising

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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

Which of the following is not a chemical change?

A. Rusting of iron

B. Burning of magnesium

C. Sublimation of iodine

D. Electrolysis of water

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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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Brass contains

A. copper and tin

B. aluminium and magnesium

C. copper and zinc

D. copper, tin and zinc

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4

Hydrogen gas has

A. a very sweet smell

B. a very pungent smell

C. an irritating smell

D. no smell at all

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The process of heating steel to bright red heat and cooling suddenly by plunging it into water is known as

A. annealing

B. hardening

C. quenching

D. tempering

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4

A common rodenticide is (Rat Poison)

A. malathion

B. parathion

C. zinc phosphide

D. diuron

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4

Optical instruments are made of

A. pyrex glass

B. flint glass

C. quartz glass

D. Crooke's glass

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4

Which among the following is a local anaesthetic?

A. Chloroform

B. Morphine

C. Streptomycin

D. Cocaine

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4

Invar, used for making pendulums is an alloy of steel with

A. tungsten

B. nickel

C. manganese

D. chromium

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The percentage of silver in German silver is

A. ten

B. twenty

C. zero

D. fifty

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Radium was isolated from

A. galena

B. dolomite

C. sylvine

D. pitchblende

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4

Marble is

A. calcium carbonate

B. sodium carbonate

C. magnesium sulphate

D. ferric chloride

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4

Harmful bacteria in drinking water cannot be destroyed by

A. chlorination

B. boiling

C. adding caustic soda

D. ozonisation

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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

A metal which occurs 'free' in nature is

A. gold

B. zinc

C. tin

D. molybdenum

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Which of the following statements regarding natural radioactivity is true?

A. It is spontaneous disintegration of atoms

B. It is induced by bombardment with projectiles

C. It is transmutation of atoms with projectiles

D. It is dependent on temperature