Question

Match List-I with List-II.

List-I	List-II
(A) Close contour lines	(I) Foot hill
(B) Wider contour lines	(II) Higher contour values outside
(C) Depression	(III) At right angles
(D) Crossing of ridge lines	(IV) Top of hill

Choose the correct answer from the options given below:

• (A) - (IV), (B) - (I), (C) - (II), (D) - (III)
• (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
• (A) - (II), (B) - (III), (C) - (I), (D) - (IV)
• (A) - (IV), (B) - (II), (C) - (I), (D) - (III)

Hint:

Think about what close versus wide contour spacing tells you about slope, and what a closed loop with rising values around it represents.

Answer 1

The Correct Option is A

Step 1: Close contour lines sit very near each other on the map. That happens only where the ground level changes a lot over a short horizontal run, in other words a steep slope. On a hill, the steepest part of the slope is right below the summit, so close contours mark the top of the hill. This gives (A) - (IV).

Step 2: Wider contour lines are spaced far apart, which means the elevation changes slowly over a long horizontal run, a gentle slope. On a hill this gentle stretch lies at the base, the foot hill. This gives (B) - (I).

Step 3: A depression, such as a pond or a pit, is drawn as a set of closed loops where the innermost loop carries the lowest elevation value and the values climb as you move outward from the centre. So a depression is recognised by higher contour values lying outside the loop. This gives (C) - (II).

Step 4: A ridge line (or a valley line) joins the highest (or lowest) points across a series of contours. Since contours represent constant elevation, they must cut across the ridge or valley line exactly where the slope direction reverses, and this always happens at right angles. So crossing of ridge lines pairs with at right angles, giving (D) - (III).

Step 5: Putting all four pairs together: (A) - (IV), (B) - (I), (C) - (II), (D) - (III), which is option 1.

Why the other options fail: Option 2 pairs depression with at right angles and ridge crossing with top of hill, mixing up a slope feature with an elevation feature. Option 3 sends depression to foot hill, but a depression is a closed low point, not simply a location on a hill slope. Option 4 keeps (A) - (IV) correctly but swaps (B) and (C), wrongly linking wider contours to elevation values instead of slope.