Civil Engineering - Building Materials

46. 

Portland cement manufactured from pure white chalk and clay but free from iron-oxide, is known as

A. quick setting cement
B. rapid hardening cement
C. white cement
D. low heat Portland cement.

Answer: Option C

Explanation:

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47. 

Dry rot

A. cracks the timber
B. reduces the strength of timber
C. reduces the timber to powder
D. shrinks the timber
E. spoils the appearance of timber.

Answer: Option C

Explanation:

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48. 

Which one of the following polymers is obtained from condensation polymerization ?

A. phenol formaldehyde
B. carbamide
C. melamine-formaldehyde
D. all of these.

Answer: Option D

Explanation:

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49. 

The weight of 1 m3 of brick earth, is about

A. 1200 kg
B. 1500 kg
C. 1800 kg
D. 2000 kg.

Answer: Option C

Explanation:

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50. 

Pozzolana (or surkhi) is used in lime

A. to impart hydraulicity
B. to prevent shrinkage
C. to decrease the cost of construction
D. to decrease the setting time.

Answer: Option A

Explanation:

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