Interpretation of Topographical Maps-II
ICSE · Class 10 · Geography
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See them allWhat is the National Grid Reference system used in Indian topographical maps?
Answer
The National Grid Reference system divides surveyed territory into 100 km x 100 km squares, each designated by two English alphabets (e.g., PQ, QR). Each square is further divided into 10,000 smaller …
How do you read a four-figure grid reference?
Answer
Rules for four-figure grid reference: (1) Origin is South-West corner, (2) Eastings read to the East of origin, (3) Northings read to the North of origin, (4) Always state Eastings first, then Northin…
Explain the method to find six-figure grid reference.
Answer
Steps for six-figure grid reference: (1) Note four-figure grid reference (e.g., 2575), (2) Divide the 1 km x 1 km square into 10 equal parts, creating 100m x 100m squares, (3) Determine position withi…
What are the three ways to express scale on topographical maps?
Answer
Scale can be expressed as: (1) Statement - e.g., 1 cm represents 50 km, (2) Representative Fraction (R.F.) - e.g., 1:50,000 (universal scale), (3) Linear Scale or Graphical Scale - shows distance on m…
Define contour lines and their basic characteristics.
Answer
Contour lines are imaginary lines joining places having the same elevation above mean sea level. Characteristics: (1) Show places of equal heights, (2) Closely spaced = steep slopes, widely spaced = g…
What are Index Contours and why are they used?
Answer
Index Contours are accentuated contour lines that appear every fifth line (multiples of 20m = 100m intervals) on 1:50,000 scale maps. They are drawn thicker/darker to make contour maps more distinct a…
How are steep slopes and gentle slopes represented by contours?
Answer
Steep slopes: Contours drawn close together with small horizontal distance between them. Gentle slopes: Contours drawn far apart with large horizontal distance between them. The spacing determines slo…
Describe the contour pattern of a conical hill.
Answer
A conical hill is represented by concentric contours spaced at regular intervals, forming circular or oval patterns. The innermost contour represents the summit (highest point), and contours expand ou…
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