26) The crushing strength of a good building stone should be more than

• (a) 50 MPa
• (b) 100 MPa
• (c) 150 MPa
• (d) 200 MPa

27) Most of the stones possess the specific gravity in the range of

• (a) 1 to 1.5
• (b) 1.5 to 2
• (c) 2.4 to 2.8
• (d) 3 to 4

28) In order to dry the quarry sap of a freshly quarried stone, it should be exposed to open air for a period of

• (a) one month
• (b) four months
• (c) six to twelve months
• (d) two years

29) A good building stone is one which does not absorb more than ................. of its weight of water after one day’s immersion.

• (a) 5%
• (b) 10%
• (c) 15%
• (d) 25%

30) The specific gravity of stone should not, in any case, be less than

• (a) 1
• (b) 1.5
• (c) 2
• (d) 2.5