Question

The contour lines drawn sort of an inverted V, which decreases inwards is employed to represent an enormous.
(A) Hanging valley
(B) U-shaped valley
(C) V-shaped valley
(D) Ridge

Answer 1

Hint:A isometric line (also isoline, isopleth, or isarithm) of a function of two variables could be a curve along which the function contains a constant value so the curve joins points of equal value.

Complete answer:
The thought of lines that join points of equal value was rediscovered several times. The oldest known isobath (contour line of constant depth) is found on a map dated 1584 of the river Spaarne, near Haarlem, by Dutchman Pieter Bruins. The Dutch engineer Nicholas Cruquius drew the bed of the river Merwede with lines of equal depth (isobaths) at intervals of 1 fathom in 1727, and Philippe Buache used them at 10-fathom intervals on a chart of the English Channel that was prepared in 1737 and published in 1752.
Such lines were wont to describe a land surface (contour lines) during a map of the Duchy of Modena and Reggio by Domenico Vandelli in 1746, and that they were studied theoretically by Ducarla in 1771, and Charles Hutton used them within the Schiehallion experiment. In 1801, the chief of the French Corps of Engineers, Haxo, used contour lines at the larger scale of 1:500 on an idea of his projects for the Rocca duo.
By around 1843, when the Ordnance Survey began to regularly record contour lines in Great Britain and Ireland, they were already generally used in European countries. Isobaths weren't routinely used on nautical charts until those of Russia from 1834, and people of England from 1838.

Hence the correct answer is option C.

Note:All rivers flow downhill from higher to the lower elevations, perpendicular to the contour above it. As a rule of thumb, the V-shaped contour is pointing upstream (the other way from the flow of a stream or river). The “V” shape contours indicate streams and drainage.