1561. The ground surface slopes 1 in 50 along a proposed railway embankment 150 m in length. The height of the embankment at zero chainage is 0.5 m, the width is 11 m and side slopes 2:1. If the falling gradient of the embankment is 1 in 150, the quantity of the earthwork calculated by Prismoidal formula, is____________________?

A. 3250 m3
B. 3225 m3
C. 3275 m3
D. 3300 m3
✅ The correct answer is option B.

1566. The assumption on which the trapezoidal formula for volumes is based, is________________?

A. The end sections are parallel planes
B. The mid-area of a pyramid is half the average area of the ends
C. The volume of the Prismoidal is over-estimated and hence a Prismoidal correction is applied
D. All the above
✅ The correct answer is option D.