The age of a tree can be known by examining_________________?

A. cambium layer
B. annular rings
C. medullary rays
D. heart wood

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

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 percentage of alumina in a good brick earth lies between________________?

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

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

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

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

The process of mixing clay, water and other ingredients to make brick is known as______________?

A. kneading
B. moulding
C. pugging
D. drying

The internal size of mould used in brick preparation is__________________?

A. equal to the size of a fully burnt brick
B. smaller than the size of a fully burnt brick
C. greater than the size of a fully burnt brick
D. none of the above

Which of the following bricks are used for lining of furnaces ?

A. overburnt bricks
B. underburnt bricks
C. refractory bricks
D. first class bricks