REPRESENTATION OF GEOGRAPHICAL FEATURES ON
TOPOGRAPHICAL SHEETS
ICSE CLASS 7
GEOGRAPHY QUESTION ANSWER
Fill in the blank
1.________ shows much details about small
areas. Ans: topographical map
2. ________ is the headquarter of the Survey of
India. Ans: Dehradun
3. ________ indicates perennial water body. Ans: blue
4. The ratio of the distances on the map and
the corresponding actual distance on the ground is called _______. Ans: Map Scale
5. contour lines depict the _________ features
of a place. Ans: relief
6.latitudes and ________ on the topographical
map indicate the exact location of a place. Ans: Longitude
7. R.F. stands for ans: representative
fraction.
q State
whether the following statements are true or false
1. A map
represents the spherical earth on a flat paper. = True
2. Scale written in a statement form like 2cm to a
km is called representative fraction= False
3. When we need to measure distance along a curve
line, we first mark the two points whose distance is to be measures == True
4. Maps use
signs and symbols that are not accepted internationally to depict certain
features and characteristics== False
5. Drainage
features include all natural and human made water features == True
Definition the terms:
a. Barren land: a dry land where plants cannot
grow
b. Contour line: line on a map joining point that
are same height above or below sea level
c. Sand dunes: hill of sand formed by the wind in
a desert or near a beach
d. Topographical map: shows much details about
small areas
e. Map Scale: The ratio of the distances on the
map and the corresponding actual distance on the ground is called
f. Causeway: It is a raised road or platform
across a minor stream that is motor able during dry season.
g. Brackish: The well whose water is unfit for
drinking and cultivation as it is salty is said to be brackish
h. Meander:
It is a bend in the river flowing through a plain. Its presence indicates a
flat land.
1. Name the tools and devices used in Geography
to study about the earth.
Answer: The
geographer of today uses maps, GPS, GIS, theodolites, and remote sensors.
However, they will also rely on surveys and censuses for social information.
2. What are topographical sheets?
Answer: Topographic maps are detailed, accurate graphic
representations of features that appear on the Earth's surface.
3.How is grid useful?
Answer: A man made system used to accurately
measure the position of any place on surface of earth the grid marks the
location of place by use of latitude and longitude. A grid system in graphic
design uses a two-dimensional framework. Earth has a geographical grid. This
grid is found on the globes and on flat maps.
5.Which system of measurement we follow in
India?
Answer: India adopted the metric system, also
known as the International System of Units (SI), in stages between 1955 and
1962.
6.What is arbitrary grid system?
Answer: Arbitrary grid: when grids of the maps
are drawn on random data they are called arbitrary grid. It generally is drawn
from field data and then analyses.
q Answer the followings:
1. What features do yellow, white, brown and red
represent on topographical maps?
answer: yellow: - agricultural land
white: barren land
brown: contour heights,
red: permanent settlements
2. Explain the different types of scales
Ans: 1. Verbal scale — In this method the scale is
expressed in words, e.g., 1 cm on the map represents 50 km on the ground. This
method is not very popular as it does not give the accurate measurement.
2. Graphic
scale — This scale represents the relationship between the distance on the map
and distance on the ground. It is drawn according to the statement in such a
way that the distance can be calculated most accurately on the map.
3. RF — The numerical fraction/ representative fraction
is the method of measuring distance that shows the ratio between the distance
on the map to the distance on the ground.
4. How is distance measured along a straight line
on the map using scales?
Answer: The straight-line distance on a map can
be easily measured using a strip of paper with straight edge in the following
way.
First mark the points, say A and B, between
which the distance is to be measured
Place the edge of the strip of paper along the
line AB.
Mark the limits of distances on the paper.
Now place the paper along the linear scale and
read the map distance.
The distance between points A and B can also be
measured using a divider.
5. What are large and small scale?
Answer: Large scale maps show a smaller amount of
area with a greater amount of detail. The geographic extent shown on a large
scale map is small. A large scaled map expressed as a representative scale
would have a smaller number to the right of the ratio. For example, a large
scale map could have a RF scale of 1: 1,000. Small scale refers to world maps
or maps of large regions such as continents or large nations. In other words,
they show large areas of land on a small space. They are called small scale
because the representative fraction is relatively small.
6. What are the conventional symbols?
Answer: A conventional symbol is a symbol that
is widely accepted interpretation. The various features shown on a map are
represented by conventional signs or symbols. For example, colors can be used
to indicate a classification of roads.
7. How are boundaries shown on topographical map?
Answer: Topographic maps conventionally show
topography, or land contours, by means of contour lines. Contour lines are
curves that connect contiguous points of the same altitude. In other words,
every point on the marked line of 100 m elevation is 100 m above mean sea
level.
8. State the importance of colours in
topographical maps.
Answer
Topographical maps portray natural features,
man-made features and cultural features using appropriate colours. Each color
used on maps has its own significance. For example, yellow is used to show
cultivable land, plateaus, deserts and plains, green is used for forest area or
lowland areas.
The colours are universally accepted both for
interpretation of survey sheets and map pointing.
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