21) Le-chatelier method is used to determine

• (a) initial setting of cement
• (b) fineness of cement
• (c) soundness of cement
• (d) normal consistency of cement

22) The diameter of a cylinder in the Le-chatetier apparatus for conducting soundness test is

• (a) 22 mm
• (b) 30 mm
• (c) 35 mm
• (d) 40 mm

23) Which of the following test is not used for testing fineness of cement?

• (a) Air permeability test
• (b) Wagner Turbidimeter method
• (c) Density bottle method
• (d) Sieve method

24) The specific gravity of cement is generally about

• (a) 2.7
• (b) 3.15
• (c) 4.56
• (d) 7.85

25) The expansion of cement should not exceed ................. for any type of Portland cement.

• (a) 5 mm
• (b) 10 mm
• (c) 15 mm
• (d) 20 mm