Civil Engineering - Building Materials

21. 

Pick up the correct statement from the following:

A. Corrugated sheet iron is made by passing plain sheets between grooved rollers
B. Strength and stiffness of corrugated sheets are considerably increased
C. Corrugated sheets are generally gal-venised to protect iron from corrosion by rust
D. Corrugated sheets are generally used on slanting roofs
E. all the above.

Answer: Option E

Explanation:

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22. 

Quick setting cement is produced by adding

A. less amount of gypsum in very fine powdered form
B. more amount of gypsum in very fine powdered form
C. aluminium sulphate in very fine powdered form
D. pozzolana in very fine powdered form
E. none of these.

Answer: Option C

Explanation:

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23. 

Duco is one of the patent forms of

A. emulsion paints
B. plastic paints
C. bituminous paints
D. aluminium paints
E. cellulose paints.

Answer: Option E

Explanation:

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24. 

Pick up the correct statement from the following:

A. The substance which consists of one primary chemical, is known as monomer
B. The polymer consists of thousands of monomers joined together
C. The polymer molecule is called macro-molecule
D. A polymetric material consists of a large number of long-chain molecules
E. All the above.

Answer: Option E

Explanation:

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25. 

Bulking of sand is caused due to

A. surface moisture
B. air voids
C. viscosity
D. clay contents
E. all the above.

Answer: Option A

Explanation:

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