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A form of carbon which is a good lubricant is

A. diamond

B. coke

C. graphite

D. charcoal

Correct Answer :

C. graphite


Related Questions

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In the mouth, starch is converted into ______ by the action of saliva.

A. sucrose

B. glucose

C. fructose

D. mannose

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The scientist associated with the discovery of the nucleus was

A. Rutherford

B. Moseley

C. Niels Bohr

D. J.J. Thomson

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An essential condition for rusting is

A. high temperature

B. light

C. moisture

D. dry air

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Annealing of glass is done in

A. a cupel

B. a long narrow chamber

C. an open furnace

D. a closed furnace

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Which of the following is not a characteristic of potable water?

A. It must be free from suspended impurities

B. It must be free from harmful bacteria

C. It must contain traces of sodium bicarbonate

D. It must have a fishy odour

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Which of the following is a halogen?

A. Radon

B. Astatine

C. Cesium

D. Ruthenium

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Ozone is an allotrope of Oxygen, containing ______ atom/s of oxygen per molecule instead of two.

A. three

B. four

C. one

D. five

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Two or more entirely different compounds having the same molecular formula are known as

A. isobars

B. isotopes

C. isomorphs

D. isomers

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A hormone which contains iodine is

A. adrenalin

B. glucagon

C. epinephrin

D. thyroxin

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The carbon cycle ensures that

A. the percentage of carbon dioxide in air is kept almost constant

B. air always contains a constant proportion of oxygen

C. sufficient amounts of carbohydrates are produced

D. the process of photosynthesis proceeds smoothly

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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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Iron is coated with zinc to prevent rusting. The process is called

A. annealing

B. tempering

C. calcining

D. galvanising

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Methylated spirit is a mixture of

A. methyl alcohol and acetic acid

B. methyl alcohol and ethyl alcohol

C. ethyl alcohol and pyridine

D. methyl alcohol and pyridine

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A burning substance which continues to burn in a jar of carbon dioxide is

A. zinc

B. red phosphorus

C. magnesium

D. sulphur

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The function of nitrogen in air is

A. to make air a moderate supporter of combustion

B. to maintain the density of air constant

C. to prevent the hydrogen in air from exploding

D. to reduce the poisonous nature of ozone in air

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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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An antipyretic is a drug used

A. in the treatment of malaria

B. to relieve sleepiness

C. to induce sleep

D. to lower body temperature

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Glass articles are annealed so that

A. they may appear better

B. they can resist the action of acids and alkalies

C. they lose their brittleness

D. they can withstand temperature shocks

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Rain water collected after a shower la very pure because

A. the initial showers wash the atmosphere free from most of the impurities

B. it contains desirable salts like sodium chloride and ammonium nitrate

C. it dissolves the gases in the atmosphere like ozone which are good for health in small quantities

D. it is supposed to be 'heaven sent'

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The process that takes place in the atom bomb is

A. nuclear' fusion

B. radioactive disintegration

C. nuclear fission

D. chemical decomposition

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Plastics are synthetic

A. rubbers

B. fibres

C. resins

D. sugars

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Which one of the following gases is extremely soluble in water?

A. Carbon dioxide

B. Ammonia

C. Chlorine

D. Hydrogen sulphide

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Petroleum ether is also known as

A. kerosene

B. naphtha

C. lubricating oil

D. asphalt

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The compound used in photography is

A. ammonium dichromate

B. copper Sulphate

C. magnesium Sulphate

D. sodium thiosulphate

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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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An acid which is used as a preservative for pickles is

A. hydrochloric acid

B. citric acid

C. tartaric acid

D. acetic acid

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4

Solder is an alloy of

A. tin and copper

B. tin and lead

C. tin and zinc

D. tin, copper and zinc

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The sugar which is used in silvering mirrors is

A. sucrose

B. maltose

C. glucose

D. fructose

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The raw materials required for the manufacture of glass are

A. silica, sodium nitrate and soda ash

B. silica, limestone and sodium nitrate

C. silica, sodium oxide and limestone

D. silica, soda ash and limestone

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When ants bite, they inject

A. glacial acetic acid

B. methanol

C. formic acid

D. stearic acid