Civil Engineering - Building Materials

16. 

Cement paints usually

A. contain hydrated lime
B. contain 5% to 10% colour pigments
C. are prepared with white cement
D. contain 5% sodium chloride
E. all the above.

Answer: Option E

Explanation:

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17. 

The cement becomes unsound by the presence of excess

A. sulphur
B. magnesia
C. lime
D. All of these.

Answer: Option D

Explanation:

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18. 

The kiln which may work throughout the year, is

A. Clamp
B. Bull's kiln
C. Hoffman's kiln
D. none of these.

Answer: Option C

Explanation:

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19. 

The minimum compressive strength of 1st class bricks should be

A. 75 kg/cm2
B. 90 kg/cm2
C. 100 kg/cm2
D. 120 kg/cm2
E. 130 kg/cm2.

Answer: Option C

Explanation:

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20. 

A volatile substance added to a paint to make its application easy and smooth, is known as

A. base
B. solvent
C. vehicle
D. none to these.

Answer: Option B

Explanation:

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