91) For one cubic metre of brick masonry, the number of bricks required are

• (a) 400
• (b) 450
• (c) 500
• (d) 550

92) The dolomite bricks are

• (a) ordinary bricks
• (b) acid refractory bricks
• (c) basic refractory bricks
• (d) neutral refractory bricks

93) A good refractory brick should withstand high temperature. It should also have low coefficient of expansion and contraction.

• (a) Yes
• (b) No

94) Lime is used

• (a) as a matrix for concrete
• (b) for plastering walls, ceilings etc.
• (c) for improving soil for agricultural purposes
• (d) all of the above

95) Lime occurs in a free state in nature.

• (a) True
• (b) False