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Question
(i) On a topographical map two stations A and B are situated at height of 500 metres and 100 metres respectively. If the horizontal distance between them is 2 km, calculate the gradient.
(ii) On a topographical map, two places A and B are given. Calculate the gradient between them.
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Solution
(i) Horizontal distance = 2 km = 2000 m
Vertical difference in height = 500 – 100 = 400 metres
Gradient =`"Vertical interval"/"Horizontal equivalent"`
`= 400/2000`
`= 1/5 = 1 : 5`
(ii) Horizontal distance: Measure the distance in cms. between the two places with your ruler. Then from the R.F. given on the toposheet calculate the actual distance between the two places in km and then convert into metres.
Vertical interval in height: Find the difference between the values of the two contours in which the places lie or if no contour lines are shown, find the difference in the spot heights of the two places.
Gradient = `"Vertical Interval"/"Horizontal Equivalent" "Express your answer as a ratio"`
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Study the extract of the Survey of India Map sheet No. 45D/10 and answer the following questions:
(a)
Give the six figure grid reference of:
(i) Triangulated height 307.
(ii) The spot height 196.
(b)
Give the four figure grid reference of each of the following:
(i) The confluence of the Sipu River and the Mahadeviyo Nala.
(ii) Sheet rock.
(c) Measure the shortest distance in kilometres between the temple in, grid square 8192, and the perennial lined well at Bhakodar 8188.
(d)
What do the following represent?
(i) Black curved lines in 7788.
(ii) The blue line in the bed of the Sipu River.
(e)
(i) What is the general pattern of settlements in the region shown on the map?
(ii) Give a reason for your answer.
(f) Which is the chief form of irrigation shown in the map extract? Why is it necessary?
(g)
(i) What is the main form of transport in this region?
(ii) Give the map evidence for your answer.
(h)
(i) What is the compass direction of Dantiwada, 8582, fromBhadli Kotha, 7886?
(ii) What is the general direction of flow of the Arado. N?
(i)
(i) Name the type of drainage pattern found in grid square 8584.
(ii) What do you mean by 25r in grid square 8286?
(j)
(i) What is meant by ‘R.F.’?
(ii) What is the R.F. shown on this map extract?
Answer the following questions on the Survey Sheet Number 45 D/10. Eastings 00 to 10; Northings 17 to 28. (Map G)
(a) Give four-figure grid references of the following:
(i) Dhad Talao (ii) Sheet rock in the North-east
(iii) Rock outcrop in the North (iv) Stony waste in the South-east
(v) Open scrub south of Dhad Talao
(b) Give the six-figure grid references of the following:
(i) Police Chowki in village Dantral
(ii) Temple in Bhamra village
(iii) Well with water in settlement Devka
(iv) Spot height 310 near village Jolpur
(v) Tank near Indaria settlement
(c) Give-the direction of the following:
(i) Village Dantral (0324) from Dhann (0723)
(ii) Village Bhamra (0521) from Dhann (0723)
(iii) Village Jolpur (0718) from Malawa (0519)
(iv) Village Warka (0716) from Bikanwas (0316)
(v) Village Rampura (0617) from Dhann (0723)
(d) Give the meanings of the following:
(i) 15r in blue in grid square 0224.
(ii) 300 in brown in grid square 0426.
(iii) Black line in the northernmost part of the map.
(iv) Red line in grid square 0819.
(v) Black dots in grid square 0617.
(e) Give the settlement patterns of the following:
(i) Village Dhann (ii) In grid square 0220
(f) Measure the distances of the following:
(i) Direct distance in km. from Indaria (0826) to Jolpur (0718)
(ii) Indirect distance in km. along the cart track from Dantral (0324) to Dhann (0723)
(g) Give the drainage patterns of the following:
(i) 0827 (ii) In grid square 0226
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(j) Explain the nature of the river.
(k) Explain the relief of the area.
(l) What is the general slope of the land? Give reason for your answer.
(m) What is the main occupation of the people? Give reason for your answer.
(n) What is the mode of irrigation? Give reasons for your answer.
(o) What is the mode of transport? Give reasons for your answer.
Write short note on ‘Marginal Information’ in Topographical sheets.
