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4

The percentage of silver in German silver is

A. ten

B. twenty

C. zero

D. fifty

Correct Answer :

C. zero


Related Questions

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4

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

Fructose is also called

A. dextrose

B. fruit sugar

C. beet sugar

D. blood sugar

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4

Suspended impurities in water are effectively removed by

A. adding milk of lime

B. filtering through sand

C. adding filter alum

D. chlorination

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4

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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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

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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4

The substance preserved under water is

A. potassium

B. sodium

C. red phosphorus

D. white phosphorus

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4

The main constituent of gobar gas is

A. methane

B. nitrogen

C. carbondioxide

D. ethylene

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4

Which or the following electrolysis?

A. Aluminium

B. Copper

C. Zinc

D. Iron

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4

A mixture of ethyl alcohol and water can be separated by

A. evaporation

B. sublimation

C. using a separating funnel

D. fractional distillation

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4

In the nitrogen cycle, denitrifying bacteria

A. oxidise ammonia to nitrates

B. convert nitrogen into ammonia

C. oxidise ammonia to free nitrogen

D. oxidise ammonia to oxides of nitrogen

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4

Water always contains hydrogen and oxygen in the ratio 1:8 by weight. This is in accordance with the

A. Law of Multiple Proportions

B. Law of Definite Proportions

C. Law of Conservation of Mass

D. Law of Reciprocal Proportions

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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

Cholesterol is

A. a carbohydrate

B. a protein

C. a lipid

D. a hormone

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4

A metal which is extracted by thermal reduction is

A. nickel

B. aluminium

C. mercury

D. calcium

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4

Setting of cement is due to

A. hydration

B. dehydration

C. dialysis

D. osmosis

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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

Which of the following can absorb gases quickly?

A. Activated charcoal

B. Anthracite coal

C. Diamond

D. Graphite

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4

Which one of the following is used for dry cleaning?

A. Kerosene oil

B. Diesel oil

C. Lubricating oil

D. Petroleum ether

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4

Calamine is a ore of

A. tine

B. magnesium

C. zinc

D. copper

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4

A hormone which contains iodine is

A. adrenalin

B. glucagon

C. epinephrin

D. thyroxin

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4

The pure at form of iron is

A. wrought iron

B. steel

C. pig iron

D. nickel steel

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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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4

The earliest name given to nitrogen was

A. dephlogisticated air

B. azote

C. inflammable air

D. marine acid air

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4

The hormone which absorption is increases glucose oxidation and glucose

A. adrenalin

B. thyroxin

C. insulin

D. epinephrine

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4

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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4

Deficiency of iron causes

A. nervous disorders

B. heart diseases

C. anaemia

D. impairment of vision

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4

Vinegar is the trade name for

A. chloroform

B. acetic acid

C. phenol

D. carbon tetrachloride

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4

Heavy water was discovered by

A. TW Richards

B. FW Aston

C. Stas

D. Urey

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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