Daily Current Affairs Quiz: December 15, 2025

Answer: C [1, 2 and 4 only ]
Explanation:

Statement 1 is correct: Weathering refers to the in-situ breakdown of rocks and minerals into smaller particles without their transportation.

Statement 2 is correct: Erosion involves both the wearing away and the removal/transport of soil and rock materials by agents such as wind, running water, glaciers, and waves.

Statement 3 is incorrect: Chemical weathering involves chemical alteration of minerals (e.g., oxidation, carbonation, hydrolysis), not merely physical breakdown.

Statement 4 is correct: Biological weathering results from living organisms, including plant roots widening cracks, burrowing animals, and microbial activity.

Answer: B [Only two ]
Explanation:

Statement 1 is correct: Rectangular drainage pattern develops in strongly jointed or faulted rocky terrain, where the rock structure controls the direction of stream flow.

Statement 2 is correct: Streams in this pattern follow joints, fractures, and faults, flowing along lines of structural weakness and often making right-angle bends.

Statement 3 is incorrect: Rectangular drainage does not form in regions of uniform lithology; such regions generally give rise to dendritic drainage patterns.

Answer: D [Weathering is the breaking down of rocks on Earth's surface, while erosion involves the movement of weathered materials.]
Explanation:

• Weathering is the in-situ breakdown of rocks at or near the Earth’s surface through physical, chemical, or biological processes, without movement of the materials.
• Erosion involves the removal and transportation of the weathered materials by agents such as water, wind, ice, and waves.

Answer: A [1, 2 and 4 only ]
Explanation:

Statement 1 is correct: Water erosion is an exogenic geomorphic process where soil and rock are removed by agents such as rainfall, surface runoff, rivers, and streams.

Statement 2 is correct: Sheet erosion, rill erosion, and gully erosion are well-recognized forms of water erosion, differing mainly in intensity and scale.

Statement 3 is incorrect: Water erosion is not confined to arid and semi-arid regions; it is widespread in humid and high-rainfall areas as well.

Statement 4 is correct: Check dams, afforestation, contour bunding, and terracing reduce runoff velocity and enhance infiltration, making them effective erosion-control measures.

Answer: B [Delta]
Explanation:

A delta is formed when a river enters a sea, lake, or ocean and its velocity decreases sharply. As a result, the river deposits sediments such as silt, sand, and clay at its mouth, gradually building up a triangular or fan-shaped landform called a delta.

• Gorge and V-shaped valleys are formed mainly by river erosion in the upper course.
• Waterfall is also an erosional landform, formed due to differential erosion or sudden breaks in slope.