Civil Engineering - Building Materials

31. 

Pick up the correct statement from the following:

A. The baked earth is called terra-cotta
B. The articles prepared from clay which is burnt at low temperature and cooled down slowly, are called earthen-ware
C. The articles prepared from refractory clays which as mixed with stone and crushed pottery, are called stone ware
D. The articles prepared from fine earthen ware which is white, thin and semi-transparent, are called procelain
E. All the above.

Answer: Option E

Explanation:

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32. 

Calcination of iron ores is done

A. to remove moisture
B. to remove carbonic acid
C. by roasting in heaps
D. after dressing
E. all the above.

Answer: Option E

Explanation:

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33. 

Strength of cement concrete primarily depends upon

A. quality of water
B. quantity of aggregate
C. quantity of cement
D. water-cement ratio.

Answer: Option D

Explanation:

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34. 

Rapid hardening cement contains

A. Tri-calcium silicate
B. Tri-calcium aluminate
C. Tetra-calcium alumino-ferrite
D. Dicalcium silicate.

Answer: Option A

Explanation:

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35. 

Bitumen emulsion is

A. a liquid containing bitumen in suspension
B. a paint
C. used as anti-corrosive paint
D. all the above.

Answer: Option D

Explanation:

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