Well structured WBBSE 9 Geography MCQ Questions Chapter 5 Weathering can serve as a valuable review tool before exams.
Weathering Class 9 WBBSE MCQ Questions
Multiple Choice Questions & Answers
Question 1.
Transportation of disintegrated rocks is known as ——-
A. mechanical weathering
B. chemical weathering
C. denudation
D. erosion
Answer:
D. erosion
Question 2.
The main process of mechanical weathering in a warm desert is——–
A. saline crystal formation
B. frost action
C. granular disintegration
D. block disintegration
Answer:
C. granular disintegration
Question 3.
Which component plays an important role in the oxidation process of the weathering of rocks?
A. H2
B. O2
C. N2
D. CO2
Answer:
B. O2
Question 4.
The main component of chemical weathering is——–
A. water
B. sunlight
C. air stream
D. flora
Answer:
A. water
Question 5.
Chemical formula of humic acid-
A. C187H186 O9 N9S1
B. C10 H20 O10
C. C12 H10 O10
D. C5 H6 O7
Answer:
A. C187H186 O9 N9S1
Question 6.
Limestone clad areas are prone to——–
A. carbonation
B. hydration
C. hydrolysis
D. oxidation
Answer:
A. carbonation
Question 7.
Snowfall prone areas experience——–
A. mechanical weathering
B. chemical weathering
C. biological weathering
D. mechanical and chemical weathering
Answer:
A. mechanical weathering
Question 8.
Which of the following is visible in homogeneous rocks?
A. block disintegration
B. exfoliation
C. granular disintegration
D. biological weathering
Answer:
B. exfoliation
Question 9.
The first stage of soil formation is——–
A. solum
B. regolith
C. batholith
D. monolith
Answer:
B. regolith
Question 10.
Conical rock formed due to frost action——–
A. talus or scree
B. erg
C. pediment
D. bajada
Answer:
A. talus or scree
Question 11.
Movement of weathered rock materials in hilly areas——–
A. mechanical weathering
B. chemical weathering
C. mass movement
D. denudation
Answer:
C. mass movement
Question 12.
Talus or scree clad areas are known as——–
A. felsenmeer
B. loess
C. pediment
D. basket of eggs relief
Answer:
A. felsenmeer
Question 13.
Rusting of rocks due to chemical weathering is known as——–
A. oxidation
B. carbonation
C. solution
D. hydrolysis
Answer:
A. oxidation
Question 14.
Terrace farming is prevalent in——–
A. hilly areas
B. deserts
C. plain areas
D. coastal areas
Answer:
A. hilly areas
Question 15.
Soil erosion in desert areas takes place——–
A. due to rivers
B. due to glaciers
C. due to air stream
D. due to human beings
Answer:
C. due to air stream
Question 16.
The process in which the rocks of the surface of the earth gets disintegrated——–
A. erosion
B. denudation
C. disintegration
D. mass movement
Answer:
C. disintegration
Question 17.
Areas which are prone to chemical weathering are——–
A. Tundra areas
B. Cool Temperate areas
C. Equatorial areas
D. Semi-arid areas
Answer:
C. Equatorial areas
Question 18.
Exfoliation occurs in-
A. basalt rocks
B. granite rocks
C. sandstone
D. all types of rocks
Answer:
B. granite rocks
Question 19.
The process of mechanical weathering which is most effective in high altitude areas or cold areas——–
A. colloid plucking
B. bolder cleaving
C. frost action
D. sheeting
Answer:
C. frost action
Question 20.
The kind of weathering that takes place in heterogeneous rocks——–
A. disintegration
B. boulder cleaving
C. exfoliation
D. granular disintegration
Answer:
D. granular disintegration
Question 21.
When water freezes into ice, its volume——–
A. decreases by 8%
B. increases by 9%
C. increases by 10%
D. decreases by 11%
Answer:
B. increases by 9%
Question 22.
Layer of soil formed due to weathering in limestone regions——–
A. terra rosa
B. talus
C. blocksped
D. pediment
Answer:
A. terra rosa
Question 23.
Heavy rainfall prone tropical areas witness——–
A. mechanical weathering
B. chemical weathering
C. biological weathering
D. none of the above
Answer:
B. chemical weathering
Question 24.
Result of mechanical weathering in rocks——–
A. physical change
B. chemical change
C. both physical and chemical change
D. no changes occur
Answer:
A. physical change
Question 25.
The process in which calcium carbonate transforms into calcium bicarbonate——–
A. oxidation
B. carbonation
C. hydrolysis
D. solution
Answer:
B. carbonation
Question 26.
Both mechanical and chemical weathering occurs more in——–
A. cool temperate areas
B. warm temperate areas
C. equatorial regions
D. desert regions
Answer:
B. warm temperate areas
Question 27.
A major factor of mechanical weathering——–
A. gravitational force
B. Oxygen
C. hardness of rocks
D. heat
Answer:
D. heat
Question 28.
The process of humus formation is——–
A. regolith
B. humification
C. mineralisation
D. alluviation
Answer:
B. humification
Question 29.
Karst landforms occurs due to which form of weathering?
A. oxidation
B. carbonation
C. hydrolysis
D. biological weathering
Answer:
B. carbonation
Question 30.
Cold regions experience——–
A. mechanical weathering
B. chemical weathering
C. biological weathering
D. bio-mechanical weathering
Answer:
A. mechanical weathering
Question 31.
Rocks formed due to frost action are known as——–
A. talus
B. pediment
C. loess
D. bajada
Answer:
A. talus
Question 32.
The kind of weathering which changes the shape of a rock is known as——–
A. biological weathering
B. mechanical weathering
C. bio-mechanical weathering
D. chemical weathering
Answer:
B. mechanical weathering
Question 33.
One of the man-made reasons of soil erosion is——–
A. water flow
B. farming
C. extension of root
D. digging holes in soil
Answer:
B. farming
Question 34.
The kind of weathering causing inselberg landform——–
A. exfoliation
B. carbonation
C. hydrolysis
D. oxidation
Answer:
A. exfoliation
Fill in the blanks
1. Rock disintegration takes place in type of weathering.
Answer: mechanical
2. Oxidation is a type of……………weathering.
Answer: chemical
3. Decomposition in …………… weathering.
Answer: chemical
4. Exfoliation is commonly found in …………… areas.
Answer: desert
5. When the underlying rock layer is exposed to the surface, the process is called ………….
Answer: Biotic
6. …………… weathering is caused by plants.
Answer: carbonation
7. Limestone is dissolved as a result of ………….
Answer: oxidation
8. Rocks containing iron forms rust as a result of ………….
Answer: mechanical
9. In areas of snowfall, …………… weathering largely occurs.
Answer: chemical
10. In tropical regions, …………… weathering is largely seen.
Answer: carbonic
11. Carbon dioxide mixed with water creates …………… acid.
Answer: carbonic
12. The constituents of rocks are not altered in case of …………… weathering.
Answer: mechanical
13. In cold climatic regions, …………… is the process of mechanical weathering.
Answer: ice disintegration
14. The layer of loose and unconsolidated materials lying over the bedrock is called ………….
Answer: regolith
15. In heterogeneous rocks, …………… takes place.
Answer: granular disintegration
16. Rocks change only in shape in case of …………… weathering.
Answer: mechanical
17. The most important effect of weathering is the creation of ………….
Answer: soil
18. …………… occurs before the erosion of the rock bed.
Answer: Weathering
19. Weathering does not occur in …………… areas.
Answer: permafrost
20. In limestone regions, process of solution creates …………… topography.
Answer: karst
21. …………… cultivation should be practised on hill slopes in order to prevent soil erosion.
Answer: Step
22. Mechanical weathering of salt crystals occur largely in ………….
Answer: sandstone
23. Deposition of …………… helps in the weathering of rock bed.
Answer: ground water
24. Weathering and erosion together are called ………….
Answer: denudation
25. …………. cause biotic weathering through agriculture.
Answer: Humans
26. Granular disintegration occurs on …………… rocks.
Answer: heterogeneous
27. When water changes into ice, its volume ………….
Answer: increases
28. Weathering is a process of ………….
Answer: slow
29. …………… force is the cause of mass wasting.
Answer: Gravitational
30. The erosion of soil by raindrops is a …………… cause.
Answer: natural
State True or False
1. Disintegration of rocks by weathering is called erosion.
Answer: False
2. Mechanical weathering is dominant in tropical climate.
Answer: False
3. Weathering helps in the storage of ground water in the rock bed.
Answer: True
4. The disintegrated layer of the rock bed as a result of weathering is called regolith.
Answer: True
5. Carbonic acid helps in oxidation.
Answer: False
6. Rock particles created by the disintegration of ice crystals is called scree.
Answer: True
7. Denudation is a result of weathering and erosion.
Answer: True
8. Chelation is a type of bio-chemical weathering.
Answer: True
9. Regolith is created in the primary stage of soil formation.
Answer: True
10. Solution is a process of mechanical weathering.
Answer: False
11. Rock beds rendered bare due to the process of denudation.
Answer: True
12. Rocks become smooth and circular as a result of exfoliation.
Answer: True
13. The other name weathering is rock disintegration.
Answer: False
14. An important influence of weathering is the formation of soil.
Answer: True
15. Rusting of rocks occurs due to the process of carbonation.
Answer: False
16. The characteristics of a rock remain unchanged in chemical weathering.
Answer: False
17. Atmosphere is the main component of weathering.
Answer: False
18. Weathering is a slow process.
Answer: True
19. Climate has great influence on the process of erosion.
Answer: True
20. Weathering helps in increasing soil fertility.
Answer: True
21. Rainfall that occurs as a result of season change helps in mechanical weathering.
Answer: True
Match the columns
| Column 1 | Column II |
| 1. Exfoliation | A. Cold mountain region |
| 2. Frost action | B. Tropical region |
| 3. Hydrolysis | C. Limestone region |
| 4. Carbonation | D. Hot desert area |
Answer:
1 -D, 2-A, 3-B, 4-C
| Column 1 | Column II |
| 1. Disintegration of rocks | A. Erosion |
| 2. Decomposition of rocks | B. Mechanical weathering |
| 3. Exposure of rocks | C. Chemical weathering |
| 4. Transportation of rocks | D. Denudation |
Answer:
1 – B, 2-C, 3-D, 4-A
| Column 1 | Column II |
| 1. Mineral of tropical region | A. Oxidation |
| 2. Rusting of rocks. | B. Bauxite |
| 3. Primary stage of soil erosion | C. Mass wasting |
| 4. Gravitational force | D. Regolith |
Answer:
1-B, 2-A, 3-D, 4-C
Crossword
Question 1.
Clues:
Down:
1. A homogeneous rock.
2. The gas required for oxidation process.
4. Weathering helps in its formation.
Across:
3. The process in which water combines with mineral rocks.
4. Type of weathering in which a single layer of rock breaks off from the stone.
Answer:
Down:
1. GRANITE
2. OXYGEN
4. SOIL
Across:
3. HYDRATION
4. SHEETING
Question 2.
Clues:
Down:
2. This type of weathering leads to formation of homogeneous rocks.
3 . Coneshaped deposit of rock fragments due to weathering
Across:
1. The process of breaking down of earth’s surface by climatic agents.
4. This type of weathering is common in limestone regions.
5. Organic component formed due to decomposition of plants.
Answer:
Down:
2. EXFOLIATION
3. TALUS
Across:
1. WEATHERING
4. CARBONATION
5. HUMUS