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Which of the following is not a physical change?

A. Distillation of water

B. Action of heat on potassium chlorate

C. Powdering of glass

D. Burning of an electric lamp

Correct Answer :

B. Action of heat on potassium chlorate


Related Questions

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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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Nitrous oxide used as anaesthetic is usually mixed with

A. ethyl alcohol

B. chloroform

C. oxygen

D. methyl alcohol

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The value of Avogadro Number is

A. 6.023 x 1022

B. 1 x 10-14

C. cl 6.056 x 10-6

D. 6.023 x 1023

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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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Clark's method for removal of temporary hardness in water uses

A. calcium hydroxide

B. washing soda

C. calcium chloride

D. zeolite

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The substance preserved under water is

A. potassium

B. sodium

C. red phosphorus

D. white phosphorus

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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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Ascorbic acid is the chemical name for

A. Vitamin B6

B. Vitamin C

C. Vitamin K

D. Vitamin D

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Which of the following is not an antibiotic?

A. streptomycin

B. terramycin

C. aureomycin

D. codein

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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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Radium was isolated from

A. galena

B. dolomite

C. sylvine

D. pitchblende

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The number of neutrons in the nucleus of an atom of mass A and atomic number Z is given by

A. A - Z

B. A + Z

C. Z

D. A

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The hormone which absorption is increases glucose oxidation and glucose

A. adrenalin

B. thyroxin

C. insulin

D. epinephrine

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The poisonous nature of carbon monoxide is due to

A. cutting off supply of oxygen

B. it™s being converted into carbon dioxide

C. its combination with haemoglobin of blood

D. its blocking of vocal chords

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Which of the following is not an alloy of copper?

A. Bronze

B. Brass

C. Solder

D. Gun metal

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Apart from lead tetra-ethyl, the other compound used as antiknock is

A. n-heptane

B. n-octane

C. iso-heptane

D. iso-octane

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Compounds containing only carbon and hydrogen are called

A. carbohydrates

B. carbides

C. hydrocarbons

D. carbonyls

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Gold dissolves in aqua regia due to the formation of

A. chloro auric acid

B. auric chloride

C. gold nitrate

D. aurous chloride

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Penicillin was discovered by

A. Alexander Fleming

B. Sir JJ Thomson

C. Dr Nessler

D. Sir John Russel

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The earliest name given to nitrogen was

A. dephlogisticated air

B. azote

C. inflammable air

D. marine acid air

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A mixture of carbon monoxide and hydrogen is

A. coal gas

B. producer gas

C. water gas

D. gobar gas

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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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Compounds of nitrogen with metals are called

A. nitrates

B. nitrites

C. hyponitrates

D. nitrides

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Diamonds are weighed in

A. grams

B. pounds

C. carats

D. tons

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Ozone occurs in the upper layers of air in the atmosphere because

A. it is lighter than air

B. in the lower layers it becomes unstable

C. ultra-violet light is present only in the upper layers

D. it mixes freely with O2 in the upper layers

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Heavy water was discovered by

A. TW Richards

B. FW Aston

C. Stas

D. Urey

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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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Plastics are synthetic

A. rubbers

B. fibres

C. resins

D. sugars

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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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Tincture iodine is

A. a disinfectant

B. an analgesic

C. a hypnotic

D. a dye