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

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

A. Both A and R are true and R is the correct explanation of A
B. Both A and R are true but R is not the correct explanation of A
C. A is true but R is false
D. A is false but R is true

A. 2.5 m
B. 3.5 m
C. 4.5 m
D. 5.5 m

A. single flemish bond
B. double flemish bond
C. English bond
D. zigzag bond

A. to increase the initial setting time of cement paste in concrete
B. to decrease the initial setting time of cement paste in concrete
C. to render the concrete more water tight
D. to improve the workability of concrete mix

A. less than 1
B. equal to 1
C. greater than 1
D. less than 1 in beams but greater than 1 in channels