Civil Engineering - Building Materials

11. 

When a brick is immersed in water for 24 hours and then dried, if

A. no grey or white deposits appear on the surface, the brick is free from soluble salts
B. 10 per cent surface is covered with grey or white deposits, the brick has slight efflorescence
C. 50 per cent surface is covered with grey or white deposits, the brick has serious efflorescence
D. All the above.

Answer: Option D

Explanation:

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12. 

In arches, stratified stones are placed so that their planes are

A. parallel
B. perpendicular
C. radial
D. none of these.

Answer: Option C

Explanation:

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13. 

Pick up the correct statement from the following:

A. Acid test is done to find out the weathering quality of stones
B. Attrition test is done to find out the rate of wear of stones which are used in road construction
C. Crushing test is done to find out the compressive strength of the stone
D. Impact test is done to determine toughness of a stone
E. All the above.

Answer: Option E

Explanation:

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14. 

The fire clay contains pure

A. lime
B. oxide of iron
C. hydrated aluminium silicate
D. magnesium.

Answer: Option C

Explanation:

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15. 

Pick up the correct characteristic of Pyroxene from the following:

A. It forms octagonal crystals
B. It converts to chlorine by hydration
C. Its density is 2.3 to 3.6 g/cm2
D. Its hardness is 5 to 6
E. All the above.

Answer: Option E

Explanation:

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