66) The size of mould for bricks should be ................. the specified size of the bricks.

• (a) equal to
• (b) smaller than
• (c) larger than

67) The defect in which white patches appear on a brick surface is known as

• (a) efflorescence
• (b) spots
• (c) bloating
• (d) blisters

68) The number of bricks required for a 5 cubic metre brick wall are

• (a) 250
• (b) 600
• (c) 1500
• (d) 2500

69) The term frog means

• (a) an apparatus to lift the stone
• (b) a depression on the face of a brick
• (c) vertical joint in a brick work
• (d) soaking brick in water

70) Which of the following defect appears due to the presence of alkalies in the bricks?

• (a) Bloating
• (b) Black core
• (c) Cracks
• (d) Efflorescence