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What is the correct answer?

4

Annealing of glass is carried out by

A. rapid cooling

B. rapid heating

C. slow cooling

D. slow heating

Correct Answer :

C. slow cooling


Related Questions

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4

The pH or pure water is nearly 7.0 It will increase on the addition or

A. hydrochloric acid

B. ammonia

C. cane sugar

D. common salt

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4

White vitriol is

A. ZnSO4 . 7H2O

B. FeSO4 . 7H2O

C. MgSO4 . 7H2O

D. CaSO4 . 2H2O

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4

Temporary hardness is due to the presence of

A. calcium carbonate

B. calcium bicarbonate

C. magnesium sulphate

D. calcium sulphate

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4

Penicillin was discovered by

A. Alexander Fleming

B. Sir JJ Thomson

C. Dr Nessler

D. Sir John Russel

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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

Lead soaps are used in

A. shaving creams

B. adhesive tapes

C. toilet powders

D. lubricants

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4

A non-metal which is a good conductor of electricity is

A. graphite

B. phosphorus

C. sulphur

D. iodine

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4

The most abundant noble gas present in air is

A. neon

B. argon

C. helium

D. krypton

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4

Flint glass contains

A. potassium and lead silicates

B. zinc and barium borosilicates

C. potassium and calcium silicates

D. sodium and calcium silicates

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4

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

A drug that is usually administered for malaria is

A. sulphanilamide

B. quinine

C. methicillin

D. novocaine

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4

An example of stimulant fertilizer is

A. gypsum

B. urea

C. potassium nitrate

D. ammonium phosphate

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4

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

A. sucrose

B. glucose

C. fructose

D. mannose

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4

Which of the following is not an alloy of copper?

A. Bronze

B. Brass

C. Solder

D. Gun metal

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4

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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4

Copper is purified by

A. poling

B. tempering

C. calcination

D. galvanising

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4

The most abundant constituent in air is

A. hydrogen

B. nitrogen

C. oxygen

D. noble gases

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4

Riboflavin deficiency causes

A. tongue inflammation

B. pellagra

C. night blindness

D. anaemia

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4

A light alloy having high tensile strength is

A. German silver

B. solder

C. magnalium

D. bell metal

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4

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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4

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

Oil of winter green contains

A. acetone

B. ether

C. acetic acid

D. methyl salicylate

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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 neutron was discovered by

A. Chadwick

B. Madam Curie

C. Becquerel

D. Aston

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4

The compound used in photography is

A. ammonium dichromate

B. copper Sulphate

C. magnesium Sulphate

D. sodium thiosulphate

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4

Petroleum ether is also known as

A. kerosene

B. naphtha

C. lubricating oil

D. asphalt

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4

Brine is a solution of

A. sodium chloride in water

B. iodine in alcohol

C. sulphur in carbon disulphide

D. Potassium iodide in water

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4

The Combined Gas Law equation is

A. P1V1T1 = P2 V2 T2

B. P1V1T2 = P2V2T1

C. P = P1 + P2 + P3

D. C =

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4

Boiler scales' contain

A. calcium carbonate

B. magnesium bicarbonate

C. calcium sulphate

D. magnesium sulphate

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4

The commonest ore of aluminium is

A. cryolite

B. bauxite

C. malachite

D. azurite