The major constituents of Portland cement include 1 Lime, silica and iron oxide 2 Lime, silica and magnesia 3 Silica, alumina and magnesia 4 Lime, silica and alumina

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Reaction of alcohol, with a carboxylic acid is known as 1 Substitution Reaction 2 Addition reaction 3 Esterification 4 Hydrogenation

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What is blood ? Describe its functions in the human body ?

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Gypsum is added to cement clinker to 1 Increase the tensile strength of cement 2 Bind the particles of calcium silicate 3 Decrease the rate of setting of cement 4 Facilitate the formation of colloidal gel

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A mixture of salt and sand can be separated by 1 Sublimation 2 Dissolving in water 3 Gravity separation 4 Dry distillation

3 Answers   CISF,

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Which of the following roofs provide better protection against heat? 1 Cement slab 2 Asbestos sheets 3 Reinforced concrete 4 None of these

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The average salinity of sea water is 1 2% 2 2.5% 3 3% 4 3.5%

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Which radioactive pollutant has recently drawn the attention of the public, due to its occurrence in the building material? 1 Radium 2 Radon 3 Thorium 4 Plutonium

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Who commanded the challenger’s first flight?

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Monazite is an ore of 1 Iron 2 Titanium 3 Thorium 4 Zirconium

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The recent atomic weight scale is based on 1 1H1 2 1H2 3 6C12 4 8O16

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BARC CHIF

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