A. 5 to 10%
B. 20 to 30%
C. 50 to 60%
D. 70 to 80%
Related Mcqs:
- 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% - The main function of alumina in brick earth is_______________?
A. to impart plasticity
B. to make the brick durable
C. to prevent shrinkage
D. to make the brick impermeable - 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 - Which of the following ingredients of the brick earth enables the brick to retain its shape ?
A. alumina
B. silica
C. iron
D. magnesia - The frog of the brick in a brick masonry is generally kept on______________?
A. bottom face
B. top face
C. shorter side
D. longer side - 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 - 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 - A first class brick when immersed in cold water for 24 hours should not absorb water more than______________?
A. 15%
B. 20%
C. 22%
D. 25% - Number of bricks required for one cubic metre of brick masonry is____________?
A. 400
B. 450
C. 500
D. 550 - The most important tool in brick laying for lifting and spreading mortar and for forming joints is____________?
A. trowel
B. square
C. bolster
D. scutch
