REVISION QUESTIONSClass 8 Subject: Geography
REVISION QUESTIONS
Class 8 Subject: Geography
Q.1.Fill in the blanks.
1. The difference between the local time of any two
consecutive longitudes is
Ans: 04 minutes
2. The earth requires 24 hours for one rotation. In one hour,
Ans; 15 longitudes will face the sun
3. ................ is most useful to the man.
Ans: Ocean Continent
4. (a) Like there are landforms on land, ocean
floor also has submerged landforms because
……
Ans: Though land is continuous, its level is not the same everywhere like.
5.The .......... is an important method of geography.
Ans; Field visit
6 ................field trips are useful
for understanding the relationship between man
and environment.
Ans; Geographical
7. The Earth takes .... hours i.e. one day to complete one rotation.
Ans: 24
8. The time of a place as decided by the location of the sun in the sky, is known as its.........
Ans: local time.
9. The earth's atmosphere is protected from ........ winds coming from the Sun.
Ans: Solar
10.The inner core is in ..... state.
Ans: solid
11. The ratio of the map distance to the ground distance is ........ scale.
Ans: map
Q. 2. State True or False.
1. Iron -magnesium minerals are found in the core of the earth.: False
2. There are two layers in the crust.: True
3. The continental shelf is the most useful to man. : True
4. The hills and mountains found on the ocean bed are called submerged hills and mountains. : True
5. Through field trip one can get a second hand experience of Geographical factors and processes. : False
6. The Indian Standard Time is 5 hours 30 minutes ahead of GMT. : True
7. The time of a place as decided by the location of the sun in the sky.: True
8. The crust is the thickest of all the layers. : False
9. Maps in an atlas and world maps are examples of large scale maps.: False
10. Verbal Scale is shown graphically. : False
Q.3. Answer in one sentence.
1. What is an ocean floor?
Ans: Land submerged below oceanic water is called the ocean floor.
2. What are marine deeps and trenches?
Ans: Landforms like deep, narrow and
steep on the ocean bed are called marine deeps or trenches.
3. Which part of the ocean floor is most useful to the man?
Ans: Continental self is most useful part of the ocean floor to the man.
4. What is the purpose of Field visit?
And The purpose of Field visit to collect information about the functions of offices.
5. What is prepared for the field visit?
Ans: Questionnaire is prepared for the field visit.
6. What is a large scale map?
Ans: When a small area on the ground is shown covering a large area on the map it is a large scale map.
7. Which is the method of reducing and enlarging maps?
Ans: Clicking photos is the method of reducing and enlarging maps.
8. Which Longitude does decide the Indian Standard Time?
Ans: 82°30’ E Longitude decides the IST.
9. What are the two parts of the crust?
Ans: Continental and oceanic crusts are the two parts of the crust.
10. Which waves can travel through liquid, gases and solid mwdium?
Ans: Primary waves can travel through liquid, gases and solid mwdium.
Q.4. Write short notes.
1. Preparation for the field trip
Ans: Following preparation can be done:
1. Carrying questionnaire, a notebook, camera, pen, pencil etc.
2. Prior permission should be taken of the concerned office.
3. Not to damage anything during course of field visit.
2.Objectives of Field trip.
Ans: Following are the objectives of Field trip:
1. To get first had experience.
2. To understand Geographical concepts.
3. To understand the relationship between man and environment.
3. Abyssal plains
Ans: Beyond the continental slope lie the abyssal plains which are the flat part of the sea bed. The abyssal plains consist of various submerged landforms like hills, plateaus, etc.
4. Continental Shelf
Ans: The land near the coast and submerged under the sea is called
continental shelf. This is the shallowest part of the ocean bed. It is also called submerged coastland. Its slope is gentle. The continental shelf is very important
from the point of view of humans. Extensive fishing grounds are found in the continental shelf.
5. Oceanic Crust.
Ans: This is the second layer of the crust. It is made up of silica and magnesium. It was earlier called Sima. This layer is approximately 7 to 10 km thick. The density of this layer is 2.9 gm/cm3 to 3.3 gm/cm3. In this layer, basalt and gabbro rocks are mainly found.
Q.5. Give Geographical reasons.
1. Local time is decided by the noon time.
Ans: 1. When at a particular place, the sun reaches the maximum height in the sky it is assumed that almost half of the daytime is over and this time is considered 12 noon.
2. The time of a particular place as decided by the overhead position of the sun in the sky is considered as the local time of that place.
3. During the rotation of the earth, when a particular longitude comes exactly in front of the sun, it is considered as noontime (12 noon) on that longitude. This noontime is considered as local time of that longitude.
In this way, the local time is decided by noon time.
2. The local time at Greenwich is considered to be the International Standard Time.
Answer:
• The International Standard Time has been decided according to 0° longitude.
• 0° longitude passes through Greenwich, England.
• For an international coordination, it is essential to bring compatibility between the standard times of various countries in the world.
For this purpose, the local time at Greenwich is considered to be the International Standard Time.
3. The continental slope is considered to be the boundary of continents.
Answer:
• Continental slope lies beyond the continental shelf.
• The deep abyssal plain begins beyond the continental slope. Therefore, the continental slope is considered to be the boundary of continents.
4.The disposal of waste materials in the oceans by man is harmful to the environment.
Answer:
• The disposal of waste materials in the oceans by man increases the pollution of sea water.
• This disposed waste materials harm the life of marine animal life and marine plant. Thus, the disposal of waste materials in the oceans by man is harmful to the environment.
3. There is variety in the interior of the earth.
Ans: There is a difference between the elements, temperatures and the pressure found in the three parts of the interior of the earth, viz, crust, mantle and core.
In the interiors of the earth, the transitional areas are found between (a) continental crust and oceanic crust (b) crust and mantle (c) upper mantle and lower mantle (d) mantle and core and (e) outer core and inner core. Therefore, there are discontinuities in the interior of the earth.
4. Mantle is the centre of earthquake and volcanic eruptions.
Answer:
1. The rocks in the upper 100 to 200 km of the mantle melt due to the heat and the magma is created.
2. Magma chambers are found in this layer of the earth.
3. Due to the heat and pressure, the energy waves are created in mantle. These energy waves move in vertical direction and magma comes out on the surface of the earth by volcanic eruptions. Thus, mantle is the centre of earthquake and volcanic eruptions.
Q. 6. Complete the chart and map
1. Name the landforms shown in the figure.
Ans: 1. Marine deep 2. Island 3. Submarine plateau 4. Trench 5. Continental slope 6. Continental Shelf
2. Complete the following chart.
Direct ans:
Class 8 Subject: Geography
Q.1.Fill in the blanks.
1. The difference between the local time of any two
consecutive longitudes is
Ans: 04 minutes
2. The earth requires 24 hours for one rotation. In one hour,
Ans; 15 longitudes will face the sun
3. ................ is most useful to the man.
Ans: Ocean Continent
4. (a) Like there are landforms on land, ocean
floor also has submerged landforms because
……
Ans: Though land is continuous, its level is not the same everywhere like.
5.The .......... is an important method of geography.
Ans; Field visit
6 ................field trips are useful
for understanding the relationship between man
and environment.
Ans; Geographical
7. The Earth takes .... hours i.e. one day to complete one rotation.
Ans: 24
8. The time of a place as decided by the location of the sun in the sky, is known as its.........
Ans: local time.
9. The earth's atmosphere is protected from ........ winds coming from the Sun.
Ans: Solar
10.The inner core is in ..... state.
Ans: solid
11. The ratio of the map distance to the ground distance is ........ scale.
Ans: map
Q. 2. State True or False.
1. Iron -magnesium minerals are found in the core of the earth.: False
2. There are two layers in the crust.: True
3. The continental shelf is the most useful to man. : True
4. The hills and mountains found on the ocean bed are called submerged hills and mountains. : True
5. Through field trip one can get a second hand experience of Geographical factors and processes. : False
6. The Indian Standard Time is 5 hours 30 minutes ahead of GMT. : True
7. The time of a place as decided by the location of the sun in the sky.: True
8. The crust is the thickest of all the layers. : False
9. Maps in an atlas and world maps are examples of large scale maps.: False
10. Verbal Scale is shown graphically. : False
Q.3. Answer in one sentence.
1. What is an ocean floor?
Ans: Land submerged below oceanic water is called the ocean floor.
2. What are marine deeps and trenches?
Ans: Landforms like deep, narrow and
steep on the ocean bed are called marine deeps or trenches.
3. Which part of the ocean floor is most useful to the man?
Ans: Continental self is most useful part of the ocean floor to the man.
4. What is the purpose of Field visit?
And The purpose of Field visit to collect information about the functions of offices.
5. What is prepared for the field visit?
Ans: Questionnaire is prepared for the field visit.
6. What is a large scale map?
Ans: When a small area on the ground is shown covering a large area on the map it is a large scale map.
7. Which is the method of reducing and enlarging maps?
Ans: Clicking photos is the method of reducing and enlarging maps.
8. Which Longitude does decide the Indian Standard Time?
Ans: 82°30’ E Longitude decides the IST.
9. What are the two parts of the crust?
Ans: Continental and oceanic crusts are the two parts of the crust.
10. Which waves can travel through liquid, gases and solid mwdium?
Ans: Primary waves can travel through liquid, gases and solid mwdium.
Q.4. Write short notes.
1. Preparation for the field trip
Ans: Following preparation can be done:
1. Carrying questionnaire, a notebook, camera, pen, pencil etc.
2. Prior permission should be taken of the concerned office.
3. Not to damage anything during course of field visit.
2.Objectives of Field trip.
Ans: Following are the objectives of Field trip:
1. To get first had experience.
2. To understand Geographical concepts.
3. To understand the relationship between man and environment.
3. Abyssal plains
Ans: Beyond the continental slope lie the abyssal plains which are the flat part of the sea bed. The abyssal plains consist of various submerged landforms like hills, plateaus, etc.
4. Continental Shelf
Ans: The land near the coast and submerged under the sea is called
continental shelf. This is the shallowest part of the ocean bed. It is also called submerged coastland. Its slope is gentle. The continental shelf is very important
from the point of view of humans. Extensive fishing grounds are found in the continental shelf.
5. Oceanic Crust.
Ans: This is the second layer of the crust. It is made up of silica and magnesium. It was earlier called Sima. This layer is approximately 7 to 10 km thick. The density of this layer is 2.9 gm/cm3 to 3.3 gm/cm3. In this layer, basalt and gabbro rocks are mainly found.
Q.5. Give Geographical reasons.
1. Local time is decided by the noon time.
Ans: 1. When at a particular place, the sun reaches the maximum height in the sky it is assumed that almost half of the daytime is over and this time is considered 12 noon.
2. The time of a particular place as decided by the overhead position of the sun in the sky is considered as the local time of that place.
3. During the rotation of the earth, when a particular longitude comes exactly in front of the sun, it is considered as noontime (12 noon) on that longitude. This noontime is considered as local time of that longitude.
In this way, the local time is decided by noon time.
2. The local time at Greenwich is considered to be the International Standard Time.
Answer:
• The International Standard Time has been decided according to 0° longitude.
• 0° longitude passes through Greenwich, England.
• For an international coordination, it is essential to bring compatibility between the standard times of various countries in the world.
For this purpose, the local time at Greenwich is considered to be the International Standard Time.
3. The continental slope is considered to be the boundary of continents.
Answer:
• Continental slope lies beyond the continental shelf.
• The deep abyssal plain begins beyond the continental slope. Therefore, the continental slope is considered to be the boundary of continents.
4.The disposal of waste materials in the oceans by man is harmful to the environment.
Answer:
• The disposal of waste materials in the oceans by man increases the pollution of sea water.
• This disposed waste materials harm the life of marine animal life and marine plant. Thus, the disposal of waste materials in the oceans by man is harmful to the environment.
3. There is variety in the interior of the earth.
Ans: There is a difference between the elements, temperatures and the pressure found in the three parts of the interior of the earth, viz, crust, mantle and core.
In the interiors of the earth, the transitional areas are found between (a) continental crust and oceanic crust (b) crust and mantle (c) upper mantle and lower mantle (d) mantle and core and (e) outer core and inner core. Therefore, there are discontinuities in the interior of the earth.
4. Mantle is the centre of earthquake and volcanic eruptions.
Answer:
1. The rocks in the upper 100 to 200 km of the mantle melt due to the heat and the magma is created.
2. Magma chambers are found in this layer of the earth.
3. Due to the heat and pressure, the energy waves are created in mantle. These energy waves move in vertical direction and magma comes out on the surface of the earth by volcanic eruptions. Thus, mantle is the centre of earthquake and volcanic eruptions.
Q. 6. Complete the chart and map
1. Name the landforms shown in the figure.
Ans: 1. Marine deep 2. Island 3. Submarine plateau 4. Trench 5. Continental slope 6. Continental Shelf
2. Complete the following chart.
Direct ans:
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