6) The greater the percentage of tri-calcium silicate in the cement, the better will be the cement.

• (a) Correct
• (b) Incorrect

7) The compound responsible for the initial setting of cement, is

• (a) tri-calcium aluminate
• (b) tetra-calcium alumino ferrite
• (c) both (a) and (b)
• (d) none of the above

8) The ultimate strength of cement is provided by

• (a) silica
• (b) di-calcium silicate
• (c) tri-calcium silicate
• (d) tri-calcium aluminate

9) For underwater construction,.......... cement is used.

• (a) ordinary portland
• (b) expensive
• (c) quick setting

10) A good quality cement should have higher percentage of

• (a) silica
• (b) free lime
• (c) di-calcium silicate
• (d) tri-calcium silicate