Question

Given below are five statements about land levelling design:
(A) The plan inspection method of land levelling design is adapted for moderate to flat land slopes.
(B) The profile method of land levelling design consists of plotting the profiles of the grid lines and then laying the desired grade on the profiles.
(C) The contour adjustment method of land levelling design consists of a trial and error adjustment of the contour lines on a plan map.
(D) The contour adjustment method is especially adapted to the smoothening of flat lands that are to be irrigated.
(E) The plane method is rarely used for land levelling design.
Choose the correct answer from the options given below:

• A. (C), (D) and (E) only.
• B. (B), (C) and (D) only.
• C. (A), (B) and (C) only.
• D. (A), (B) and (E) only.

Hint:

Match each method (plan inspection, profile, contour adjustment, plane) to the terrain it is actually meant for.

Answer 1

The Correct Option is C

Step 1: Three methods are usually taught for land levelling design: plan inspection, profile, and contour adjustment; a fourth, the plane method, is also used.
Step 2: Statements (A), (B) and (C) restate the standard textbook description of these three methods word for word, in terms of when each is used and how each is carried out, so they are true.
Step 3: Statement (D) attaches the contour adjustment method to flat lands, but this method is actually chosen when the field has an uneven, undulating surface, so (D) does not fit and is false.
Step 4: Statement (E) calls the plane method rarely used, yet fitting a single plane grade to survey data is one of the standard, frequently applied approaches, so (E) is also false.
\[\boxed{\text{Answer: (A), (B) and (C) only}}\]