Question

Consider the following characteristics of contour: (A) A uniform slope is indicated when contour lines are spaced uniformly
(B) Contour lines cannot go anywhere but can close on themselves
(C) A set of closed contours indicates a depression or a summit, according to the lower or higher values being respectively inward
(D) A contour is an imaginary line passing through the points of an equal level on the surface of earth
Choose the correct answer from the options given below:

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

Hint:

Contour lines provide vital information about the shape and elevation of the land's surface.

Answer 1

The Correct Option is C

Step 1: Understanding Contour Characteristics.
- (A) A uniform slope is indicated by uniformly spaced contour lines, which is true.
- (B) Contour lines can close on themselves, forming a loop, which is also true.
- (C) A set of closed contours represents either a depression or a summit, with lower values being inward for a depression and higher values being inward for a summit. This is correct.
- (D) A contour is an imaginary line passing through points of equal level on the earth’s surface, which is the definition of a contour line.

Step 2: Conclusion.
All four characteristics are correct, so option (3) is the correct answer.

Final Answer: \[ \boxed{3. \, (A), (B), (C) \, \text{and} \, (D)} \]