Civil Engineering - Building Materials

11. 

Portland pozzolana cement possesses

A. higher resistance to chemical attack
B. lower heat of hydration
C. lower shrinkage on drying
D. water tightness
E. all the above.

Answer: Option E

Explanation:

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12. 

Iron ore may contain

A. carbon
B. silicon
C. sulphur
D. phosphorus and maganese
E. all the above.

Answer: Option E

Explanation:

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13. 

Wrought iron is used for

A. structural works in beams
B. small sized water pipes
C. columns and struts
D. none to these.

Answer: Option B

Explanation:

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14. 

The timber having maximum resistance against white ants, is obtained from

A. chir
B. shisham
C. sal
D. teak.

Answer: Option C

Explanation:

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15. 

Knots in timber are

A. defects caused by crushing fibres
B. splits radiating from the centre
C. speckled strains
D. signs of branches cut off.

Answer: Option D

Explanation:

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