Civil Engineering - Building Materials

26. 

Seasoning of timber is done for

A. increasing moisture content
B. decreasing moisture content
C. increasing strength of timber
D. none to these.

Answer: Option B

Explanation:

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27. 

Bitumen felt is used for

A. water proofing
B. damp proofing
C. both (a) and (b)
D. neither (a) nor (b).

Answer: Option C

Explanation:

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28. 

According to ISI, bitumen is classified into

A. 2 grades
B. 4 grades
C. 6 grades
D. 8 grades.
E. 10 grades.

Answer: Option E

Explanation:

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29. 

Lime putty

A. is made from hydraulic lime
B. is made by adding lime to water
C. can be used only upto three days
D. may be obtained from drying lime water mix passing through IS sieve No. 300
E. all of above.

Answer: Option E

Explanation:

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30. 

The minimum percentage of silica, alumina and ferric oxide in lime for white washing, is

A. 20
B. 15
C. 10
D. 5
E. 0.

Answer: Option E

Explanation:

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