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43.

Excess of alumina in brick earth makes the brick

A.	impermeable	B.	brittle and weak
C.	to lose cohesion	D.	to crack and warp on drying

44.

The nominal size of the modular brick is

A.	190 mm x 90mmx 80 mm	B.	190 mm x 190 mm x 90 mm
C.	200 mm x 100 mm x 100 mm	D.	200 mm x 200 mm x 100 mm

45.

Percentage of silica in a good brick earth lies between

A.	5 to 10%	B.	20 to 30%
C.	50 to 60%	D.	70 to 80%

46.

Excess of silica in brick earth results in

A.	cracking and warping of bricks	B.	loss of cohesion
C.	enhancing the impermeability of bricks	D.	none of the above

47.

Which of the following ingredients of the brick earth enables the brick to retain its shape ?

A.	alumina	B.	silica
C.	iron	D.	magnesia

48.

Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth ?

A.	lime stone and alumina	B.	silica and alkalies
C.	alumina and iron	D.	alkalies and magnesium

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