rounded

elongated

angular

all of the above

(i) and (iii)

(i)and(iv)

(ii) and (iii)

(ii) and (iv)

2%

4%

6%

10%

affects only the early development of strength

affects only the ultimate strength

both [a] and [b]

does not affect the strength

remains constant

increases with richer mixes

decreases with richer mixes

none of the above