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Ozone layer of stratosphere requires protection from indiscriminate use of

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Fungicides, insecticides, bactericides and medicines

  2. Aerosols and high flying jets

  3. Atomic explosions and industrial wastes

  4. Baloons and turbo-prop aeroplanes

Show answer
Correct Option: B
Explanation:

The high altitude supersonic aircraft flying in stratosphere zone emit nitrous oxides which can destroy ozone significant quantity being highly reactive. Aerosols are tiny particles in the air resulting from the burning of fossil fuels, emission from cars and factories are also causal factors of aerosols. It may be referred to the spray cans that release chlorofluorocarbons which cause the breakdown of ozone Into oxygen once these compound reach the stratosphere.

Hence, the correct answer is 'Aerosols and high flying jets'.

All of the water found on earth is called as

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Biosphere

  2. Stratosphere

  3. Hydrosphere

  4. Ocean

Show answer
Correct Option: C
Explanation:

The water present on earth in form of lakes, oceans, rivers, etc is called hydrosphere. About 2/3rd (71%) of earth's crust is covered by water. This layer contains water which regulates the atmospheric temperature and ecosystem and also maintains the aquatic life on earth. About 2.5% of hydrosphere constitutes of fresh water. So, the correct option is C.

71% of earth is covered by

evs - i the earth and its living world introduction to the spheres of the earth origin of universe introduction to natural resources

  1. Biosphere

  2. Lithosphere

  3. Atmosphere

  4. Hydrosphere

Show answer
Correct Option: D
Explanation:

a) The biosphere is the sum of all ecosystem. It is the layer of earth where life exists.

b) The lithosphere is the outer part of the earth, consisting of the crust and upper mantle.
c) The atmosphere is the layer of gases which surrounds the earth.
d) The water present on earth in form of lakes, oceans, rivers, etc is called hydrosphere. About 2/3rd (71%)of earth's crust is covered by water. water also exists in form of water vapour in the air. The water is recycled from the surface of the earth to the atmosphere and back to the earth surface by the process of the water cycle. It supports the life across the earth.
So, the correct answer is option D.

Which of the following is used to refer to the height of a point on the ground above the mean sea level?

evs - i maps - our companions maps and its study contour maps and landforms distributional maps

  1. Triangulated height

  2. Spot height

  3. Relative height

  4. Bench mark

Show answer
Correct Option: B
Explanation:

A spot height is an exact point on a map with an elevation recorded beside it that represents its height above a given datum. In the UK this is the Ordnance Datum. Unlike a bench-mark, which is marked by a disc or plate, there is no official indication of a spot height on the ground although, in open country, spot heights may sometimes be marked by cairns. In geoscience, it can be used for showing elevations on a map, alongside contours, benchmarks, etc.

The triangulated height is generally used to indicate _____________.

evs - i maps - our companions maps and its study contour maps and landforms distributional maps

  1. plateaus

  2. ridges

  3. mountain peak

  4. plains

Show answer
Correct Option: C
Explanation:

The triangulated height is generally used to indicate mountain peak.

Triangulation pillars are used by map makers. They are real concrete pillars that are placed at particular places which are usually the tops of hills or mountains.

Sopt height is represented by a ____ in the map.

evs - i maps - our companions maps and its study contour maps and landforms distributional maps

  1. triangle

  2. circle

  3. square

  4. dot

Show answer
Correct Option: D
Explanation:

Sopt height is represented by a dot in the map.

A spot height is an exact point on a map with an elevation recorded beside it that represents its height above a given datum. In the UK this is the Ordnance Datum. Unlike a bench-mark, which is marked by a disc or plate, there is no official indication of a spot height on the ground although, in open country, spot heights may sometimes be marked by cairns. In geoscience, it can be used for showing elevations on a map, alongside contours, bench marks, etc.

A spot height gives information about the ____________________.

evs - i maps - our companions maps and its study contour maps and landforms distributional maps

  1. height of a specific point only

  2. height of the relief feature

  3. height of a mountain peak

  4. none of the above

Show answer
Correct Option: A
Explanation:

A spot height gives information about the height of a specific point only.
A spot height is an exact point on a map with an elevation recorded beside it that represents its height above a given datum.

In steep slopes the difference between maximum and minimum height is represented by letter 'r' which indicates ____________.

evs - i maps - our companions maps and its study contour maps and landforms distributional maps

  1. bench mark

  2. spot height

  3. triangulated height

  4. relative height

Show answer
Correct Option: D
Explanation:

In steep slopes the difference between maximum and minimum height is represented by letter 'r' which indicates relative height.

Relative Height is a concept used in visual and artistic perspective where distant objects are seen or portrayed as being smaller and higher in relation to items that are closer.

Why Contour lines are useful ?

evs - i maps - our companions maps and its study contour maps and landforms distributional maps

  1. Show the shape of the land surface (topography) on a map.

  2. Joins points of equal elevation , above a given level.

  3. Both A and B.

  4. None of the above.

Show answer
Correct Option: C
Explanation:

Contour lines are useful because they allow us to show the shape of the land surface (topography) on a map. The two diagrams below illustrate the same island. The diagram on the left is a view from the side (cross profile view)such as you would see from a ship offshore.

Define the characteristics of Contours _________________.

evs - i maps - our companions maps and its study contour maps and landforms distributional maps

  1. Contour lines must close , not necessarily in the limits of the plan.

  2. Widely spaced contour indicates flat surface.

  3. Closely spaced contour indicates steep slope ground.

  4. All of the above.

Show answer
Correct Option: D
Explanation:

The characteristics of contour lines which help in plotting or reading a contour map are as follows;
1) Contour lines must close, not necessarily in the limits of the plan.
2) The horizontal distance between any two contour lines indicates the amount of slope and varies inversely on the amount of slope.
3) Widely spaced contour indicates a flat surface.
4) Closely spaced contour indicates a steep slope ground.