Reference no: EM132020621
Class - school/Subject -Geology/Earth Science / Board - CBSE / Topic - Geomorphic processes- Weathering
Ques 1:- Which one is not a geomorphic agent?
(a) Wind
(b) water
(c) Gas
(d) Ice
Correct answer - (c) Gas
Explanation - all the geomorphic processes operated on the earth and modifying the landscapes and landforms like geomorphic agent wind create desert landforms, water create fluvial landforms in river, similarly ice work and create glacial landforms but gas is not geomorphic agent.
Q .2 - The process of disintegration and decomposition is called?
(a) Denudation
(b) Transportation
(c) Siltation
(d) Weathering
Correct answer - (d) Weathering
Explanation - in weathering Disintegration is mechanical breakdown or physical breaking of rock and decomposition is chemical decay. In nature this two-part work simultaneously.
Q.3 - The process of weathering leads to?
(a) loss of silica
(b) increase of silica
(c) no change
(d) it is uncertain
Correct answer - (a) loss of silica
Explanation - Because weathering leads to degradation processes and our earth is made up of silicate rocks.
Q.4 - The chemical union of water with a mineral is called?
(a) Oxidation
(b) Hydration
(c) Hydrolysis
(d) Carbonation
Correct answer - (b) hydration
Explanation - in hydration water molecules combine chemically with minerals to produce new compounds. Example the conversion of olivine into serpentine.
Q.5 - The formation of gypsum from anhydrite is good example of?
a) Oxidation
b) Hydrolysis
c) Hydration
d) None of them
Correct answer - (c) hydration
Explanation - its evolves absorption of water and change in structure.
Q.6 - spheroidal weathering is more pronounced in?
a) Arctic region
b) Arid region
c) Humid climate
d) None
Correct answer - (b) arid region
Explanation - because in arid region the rate of chemical weathering is slow relative to the rate of surface erosion.
Q.7 - Basalt on weathering results in the formation of?
a) Black cotton soil
b) Chernozen
c) Lateritic
d) Loamy
Correct answer - (a) black cotton soil
Explanation - because basalt composed of mafic minerals
Q.8 - The process of erosion includes
a) Disintegration
b) Transportation
c) Both a and b
d) None
Correct answer - (c) both disintegration and transportation
Explanation - erosion is a process which includes the destruction of existing rocks and removal of the product from site of destruction.
Q.9 - Frost action takes place due to
a) Crystal growth
b) Freezing of water
c) Exfoliation
d) None
Corrects answer - (b) freezing of water
Explanation - when water freeze it expands 9 percent of its volume
Q.10 - Exfoliation is more active in
a) Massive rock mass
b) Jointed rock mass
c) Layered rock
d) None
Correct answer - (b) jointed rock mass
Explanation - because in exfoliation reduction in pressure due to removal of the overlying rock as each slab breaks off, it releases weight from the underlying mass.
Q. 11 - All of cause of physical weathering except?
a) Running water
b) Plant growth
c) Acid rain
d) Wind
Correct answer - (c) acid rain
Explanation - its product of chemical reaction
Q.12 - what process create new sand in desert
a) River erosion
b) Deposition
c) Wind erosion
d) Current
Correct answer - (c) wind erosion
Explanation - wind is powerful geomorphic agents in desert areas its erode the surfaces of rocks in the region.
Q.13 - What is major cause of weathering and erosion
a) Moving water
b) Glacier
c) Wind
d) Frost
Correct answer - (a) moving water
Explanation - its erodes river channels
Q.14 - which sequence of process occur correct order
a) Weathering-transportation-erosion
b) Transportation-erosion weathering
c) Weathering -erosion- transportation
d) None
Correct answer - (c) weathering-erosion-transportation
Explanation - weathering is breakdown of material either by physical or chemical, erosion is destruction and removal of material from site of deposition and finally eroded materials deposited on site of accumulation.
Q.15 - which of the following materials is least susceptible to chemical weathering?
a) Limestone
b) Quartz
c) Halide
d) Feldspar
Correct answer - (b) quartz
Explanation - quartz is more resistance to weathering because it is last end product of Bowen reaction series.
Q.16 - dissolving a rock in acid is equivalent of
a) Mechanical weathering
b) Chemical weathering
c) Erosion
d) Condensation
Correct answer - (b) chemical weathering
Explanation - in chemical weathering chemical reaction takes place.
Q.17 - Water in freezing form may break rocks in pieces by force of
a) Reduction
b) Evaporation
c) Expansion
d) Condensation
Correct answer - (C) expansion
Explanation - in freezing expansion rate become high.
Q.18 - with passage of time transported sediments become
a) Smother
b) Smaller
c) Rounded
d) All of them
Correct answer - (all) all of them
Explanation- during transportation the surface is weathered and sediments show considerable distances show high degree of rounding.
Q.19 - Weathering of rock is effected by
a) Rain
b) Temperature
c) Both A and B
d) Erosion
Correct answer - (c) both A and B
Explanation - because its create chemical and physical weathering
Q.20 - with reference to chemical weathering which of the following is true
a) It is rapid
b) Only rock exposed to water experience chemical weathering
c) Thick soil cover enhances chemical weathering
d) None of them
Correct answer - (c) thick soil cover enhances chemical weathering
Explanation - it is extremely slow chemicals presents in air and water set up chemicals reactions in surface layer of exposed rocks.
Q.21 - Select the correct statement
a) Granite is made up of feldspar, quartz, shale
b) Quartz crystals are quickly weathered than feldspar
c) Regolith is remains of rock which forms the basis of soil
Correct answer - (c)
Explanation - granite is made up of quartz feldspar mica, and feldspar quickly weathered than quartz
Q.22 - which of the following is strong weathering agents?
a) Rainwater absorbed by soil cover
b) Pure rain water on bare rock
c) A and B
d) None
Correct answer- (a)
Explanation - soils absorbs rain water and keeps underlying rocks in moisture, rainwater absorbs organic acids from soil and thus become stronger weathering agent than pure rain water acting on bare rocks.
Q.23 - which one is correct
a) Climates influences weathering
b) Dry climate provides good condition for chemical weathering
c) Warm wet climates provide rapid physical weathering.
d) Weathering is similar to erosion
Correct answer - (a) climates influences weathering.
Explanation - dry climates provide good condition for physical weathering and warm wet climates provide rapid chemical weathering.
Q.24 - Which one is not influenced rates of weathering
a) Climate
b) Biota
c) Time
d) Soil
Correct answer - (d) soil
Explanation - soil is weathering product of rocks
Q.25 - which is correct
a) On steep slopes weathering products may be quickly washed away by rains
b) On gentle slope weathering rates high
c) Only A is correct
d) Both A and B correct
Correct answer - (d) both A and b
Explanation- because gentle slope water may stay in contact with rock for longer period of times thus results higher weathering rates.
Q.26 - Mechanical weathering produces
a) Clay minerals
b) Quartz
c) Calcium carbonate
d) Smaller particles
Correct answer - (d) smaller particles
Explanation - because mechanical weathering involves physically breakdown of rocks particles
Q.27 - What is the term for the general process by which rocks are broken down at the Earth surface
a) Deposition
b) Erosion
c) Lithification
d) Weathering
Correct answer - (d) weathering
Explanation- its degradation process operated on the Earth crust
Q.28- Carbonic acid, the primary agent of chemical weathering is produced by
a) Carbon dioxide dissolving in rainwater
b) Plant roots
c) Bacteria that feed on plant and animal remains
d) All of these
Correct answer - (d)
Explanation - produced by chemical reaction
Q.29 - which of the processes is not an example of chemical weathering?
a) Dissolution of calcite
b) Breakdown of feldspar to form clay
c) Splitting of a rock along a fracture
d) Rusting of nail
Correct answer - (c) Splitting of a rock along a fracture
Explanation- rock broken by fracture surfaces is example of fractures
Q.30 - which of the following minerals is most stable on the Earth surface
a) Hematite
b) Mica
c) Olivine
d) Feldspar
Correct answer - (a) hematite
Explanation- because the grains of the minerals is tightly packed and high density compared to of these