Building Materials

181. In the cement the compound quickest to react with water, is

1. Tri-calcium aluminate
2. Tetra-calcium alumino-ferrite
3. Tri-calcium silicate
4. Di-calcium silicate

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182. Which of the following gradients exerts maximum influence on properties of steel?

1. Iron
2. Carbon
3. Manganese
4. Sulphur

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183. Stainless steel contains

1. 18% of chromium and 8% nickel
2. 8% of chromium and 18% of nickel
3. 12% of chromium and 36% of nickel
4. 36% of chromium and 12% of nickel

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184. Excess of silica in brick earth results in

1. Cracking and warping of bricks
2. Loss of cohesion
3. Enhancing the impermeability of bricks
4. None of the above

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185. Which one of the following is acid resistant asbestos?

1. Actinolite asbestos
2. Amosite asbestos
3. Anthophylite asbestos
4. All the above

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186. The slump recommended for mass concrete is about

1. 25 mm to 50 mm
2. 50 mm to 100 mm
3. 100 mm to 125 mm
4. 125 mm to 150 mm

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187. For preparing porcelains, the clay should be

1. Sufficiently pure
2. Of high degree of tenacity
3. Of good plasticity
4. All the above

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188. For melting one tonne of cast iron

1. 700 m^st air is required
2. 20 kg limestone is required
3. One quintal coke is required
4. All the above

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189. Pick up the correct statement regarding low heat cement from the following:

1. It possesses less compressive strength
2. Its initial setting time is about one hour
3. Its final setting time is about 10 hours
4. All the above

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190. Quick lime (or caustic lime)

1. Is obtained by the calcination of pure lime stone
2. Has great affinity to moisture
3. Is amorphous
4. All the above

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