Landforms and Their Formation NDA Questions

NDA Physical Geography

Landforms and Their Formation MCQ Questions


13.
A knickpoint in a river's long profile represents:
A.
A break in the smooth concave long profile — marked by a waterfall or rapid — caused by rejuvenation, rock resistance change, or river capture
B.
The point of maximum deposition
C.
The mouth of the river
D.
The source of the river
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ANSWER :
A. A break in the smooth concave long profile — marked by a waterfall or rapid — caused by rejuvenation, rock resistance change, or river capture
14.
Headward erosion is the process by which:
A.
A river deposits material at its source
B.
A river erodes material from its downstream end
C.
A stream extends its valley backward (upstream) toward the watershed by erosion at its source
D.
A glacier moves headward toward a cirque
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ANSWER :
C. A stream extends its valley backward (upstream) toward the watershed by erosion at its source
15.
In the middle course of a river, which type of erosion becomes dominant?
A.
Vertical (downward) erosion
B.
Lateral (sideways) erosion — the river swings from side to side widening its valley
C.
Headward (backward) erosion
D.
Chemical corrosion only
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ANSWER :
B. Lateral (sideways) erosion — the river swings from side to side widening its valley
16.
The outer bank of a meander is characterized by:
A.
Very shallow water
B.
Active erosion forming a steep river cliff (cut bank) — water velocity is highest here due to centrifugal force
C.
Balanced erosion and deposition
D.
Deposition and a gentle slip-off slope
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ANSWER :
B. Active erosion forming a steep river cliff (cut bank) — water velocity is highest here due to centrifugal force
17.
Point bars (slip-off slopes) develop on the _______ bank of a meander.
A.
Outer concave bank
B.
Southern bank
C.
Inner convex bank — water velocity is lowest here causing deposition
D.
Northern bank
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ANSWER :
C. Inner convex bank — water velocity is lowest here causing deposition
18.
Oxbow lakes form by the following sequence:
A.
Meander→neck narrows by lateral erosion→river cuts through the neck during flood→old meander loop sealed by deposition→oxbow lake
B.
Coastal erosion creates a lagoon
C.
Tectonic subsidence creates a lake
D.
Glacier melts leaving crescent-shaped depression
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ANSWER :
A. Meander→neck narrows by lateral erosion→river cuts through the neck during flood→old meander loop sealed by deposition→oxbow lake