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61.

The natural drying of bricks is also called hack drying.

True

False

62.

The indentation marks left on bricks during the process of moulding, are known as

A.	fillets	B.	frogs
C.	projections	D.	marks

63.

The frog of a brick is normally made on its

A.	longer face	B.	shorter face
C.	bottom face	D.	top face

64.

The average out-turn of first class bricks in clamp burning is about

A.	50%	B.	60%
C.	70%	D.	80%

65.

The average out-turn of first class bricks in kiln burning is

A.	50 to 60%	B.	60 to 70%
C.	70 to 80%	D.	80 to 90%

66.

The burning of bricks in kilns is complete within

A.	12	B.	24
C.	48	D.	96

67.

The bricks after burning in kilns require about

A.	4	B.	8
C.	10	D.	12

68.

The bricks should be burnt at temperature from

A.	300?C to 500?C	B.	500?C to 700?C
C.	700?C to 1000?C	D.	1000?C to 1200?C

69.

The type of briek suitable for panal walls for multi-storeyed buildings is

A.	hollow bricks	B.	perforated bricks
C.	either (a) or (b)	D.	none of these

70.

The compressive strength of second elass bricks should bot be less than

A.	7.5 MN/m2	B.	9 MN/m2
C.	10.5 MN/m2	D.	12 MN/m2