Setting of cement is due to

Question

Setting of cement is due to

A. hydration

B. dehydration

C. dialysis

D. osmosis

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Annealing of glass is carried out by

A. rapid cooling

B. rapid heating

C. slow cooling

D. slow heating

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The form of carbon used in decolourising sugar solution is

A. wood charcoal

B. animal charcoal

C. coconut charcoal

D. lamp black

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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

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Refined petroleum is decolourised by

A. manganese dioxide

B. bauxite

C. animal charcoal

D. quicklime

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The substance preserved under water is

A. potassium

B. sodium

C. red phosphorus

D. white phosphorus

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Tincture iodine is

A. a disinfectant

B. an analgesic

C. a hypnotic

D. a dye

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The gas which has a faint sweet odour is

A. nitrogen

B. nitrous oxide

C. nitric oxide

D. nitrogen peroxide

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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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Galvanising is coating Iron with

A. nickel

B. zinc

C. chromium

D. copper

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Which of the following is baking soda?

A. Na2CO3 . 10H2O

B. NaHCO3

C. Na2CO3 . H2O

D. NH4CI

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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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White vitriol is

A. ZnSO4 . 7H2O

B. FeSO4 . 7H2O

C. MgSO4 . 7H2O

D. CaSO4 . 2H2O

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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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Lead soaps are used in

A. shaving creams

B. adhesive tapes

C. toilet powders

D. lubricants

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The flux added in the blast furnace is

A. Limestone

B. FeO

C. SiO2

D. MgO

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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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One method by which the components of air can be separated is

A. shaking with caustic soda solution

B. shaking with water

C. fractional distillation of liquid air

D. passing air over heated magnesium

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Solid carbon dioxide is used

A. as a drying agent

B. as a refrigerant

C. as an antiseptic

D. as a bleaching agent

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LSD is

A. an anaesthetic

B. a psychedelic drug

C. an antipyretic

D. an antibiotic

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White lead is

A. a basic salt

B. an acid salt

C. a double salt

D. a normal salt

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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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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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Triple Antigen treatment for children is to ward off

A. whooping cough

B. tetanus

C. diphtheria

D. All the three

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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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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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High temperature thermometers use

A. sodium amalgam

B. an alloy of sodium and potassium

C. silver amalgam

D. calcium amalgam

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A light alloy having high tensile strength is

A. German silver

B. solder

C. magnalium

D. bell metal

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Which one of the following is not radioactive?

A. Astatine

B. Francium

C. Tritium

D. Zirconium

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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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Deficiency of iron causes

A. nervous disorders

B. heart diseases

C. anaemia

D. impairment of vision

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Accepted Answer

A. hydration

Setting of cement is due to

Correct Answer :

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