Discussion
In the given diagram, ovals are marked at different heights (h) of a hill. Which one of the following options P, Q, R, and S depicts the top view of the hill?
- A.
- B.
- C.
- D.
Answer: B
The top view is Q.
The profile rises steeply from 0 km to the peak at about 0.22 km and then slopes away gently to beyond 1 km. Each horizontal cross-section therefore extends a short way on the 0 km side of the peak and a long way on the far side.
Seen from above, the large low ovals reach far to the right while the small high ovals cluster near the peak, close to the 0 km end. The contours are packed tightly on the steep left side and spread out on the gentle right side. Q shows exactly this, with the inner ovals shifted towards 0 km.
P shifts the inner ovals to the right, which would put the steep face on the far side. R is concentric, a symmetric hill, and S has its ovals touching on one side, which does not match the smooth profile.
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