SENAPREP
Physical Geography Questions
Chapter: Geography | Total Available: 33 Real Questions
Which of the following statements in respect of landslides are correct?
1. These occur only on gentle slopes duringrain
2. They generally occur in clay–rich soil.
3. Earthquakes trigger landslides.
Select the correct answer using the code givenbelow.
Correct Answer
📖 Core Anchor Concept
Landslides are sudden geological phenomena where rock, soil, and debris move down slopes due to gravitational forces. They are influenced by several factors including slope steepness, soil composition, and triggers like rainfall and earthquakes.
📜 Detailed Breakdown & Chronology
- Statement 1: Incorrect. Landslides can occur on both gentle and steep slopes, primarily influenced by water saturation in soil.
- Statement 2: Correct. Landslides often occur in clay-rich soils due to their tendency to become slippery when wet.
- Statement 3: Correct. Earthquakes can destabilize slopes, triggering landslides as the ground shakes.
The accurate statements regarding landslides, therefore, are 2 and 3. This correlates to option C.
🔍 Option Analysis
- Option A: Incorrect, as statement 1 is false.
- Option B: Partially correct, but statement 1 being false makes it incorrect overall.
- Option D: Incorrect since statement 1 is untrue.
⚡ Chronology Trick / Polity Mnemonic
To remember landslide triggers: Think "Clay and Quake" - clay-rich soils and seismic activity are common precursors.
📖 Factual Verification & Reference
Verified against geology standards and literature, including Earth Science textbooks.
Which of the following is the correct ascending order of the given minerals in terms of their presence in the Earth’s crust?
1. Amphibolite
2. Mica
3. Pyroxene
Select the answer using the code given below:
1. Correct Answer
Option C is correct. The correct ascending order is Mica < Amphibolite < Pyroxene.
📖 Core Concept
The question assesses the relative abundance of different minerals in the Earth’s crust, which is a key aspect in geology and material science.
💡 3. Explanation
❌ 4. Option Analysis
- •Option A: Incorrect. This suggests Mica is less abundant than Amphibolite which is not accurate.
- •Option B: Incorrect. This order places Amphibolite as the least abundant mineral.
- •Option D: Incorrect. This incorrectly ranks Pyroxene as less abundant than Amphibolite.
NDA Speed-Run / Mnemonic Shortcut
Remember the order of mineral abundance using the initials: "M A P" for Mica, Amphibolite, Pyroxene.
5. Key Takeaways
Understanding the relative abundance of minerals is crucial in earth sciences and material applications.
Which one of the following is formed when volcanic ash is carried by running water and is deposited as a sedimentary layer?
1. Correct Answer
Option D is correct. Tuff is formed from volcanic ash carried by water or wind, then deposited and compacted as a sedimentary rock.
📖 Short Explanation
Tuff is a type of sedimentary rock created when volcanic ash is carried by natural forces like wind or water and deposited in areas, compacted over time, typically near volcanic regions.
💡 3. Why Correct Answer is Correct
❌ 4. Why Other Options are Wrong
- •Option A (Basalt): Basalt is an igneous rock formed from the cooling of magma, not a sedimentary deposit from volcanic ash.
- •Option B (Lapilli): Lapilli are small fragments of lava ejected during an eruption, not specifically related to sedimentary processes involving water transport and deposition.
- •Option C (Slate): Slate is a metamorphic rock transformed from shale or mudstone, not a direct product of volcanic ash deposition.
NDA Speed-Run / Mnemonic Shortcut
Remember the phrase "Tough Ashes Form Tuff", linking volcanic ash's role in forming the sedimentary rock tuff.
5. Key Learning Point
Tuff is a sedimentary rock formed from volcanic ash, indicative of erosion and deposition processes.
6. Visual Suggestion
Illustrate the volcanic ash ejection and deposition process in a diagram showing a volcano, ash clouds, deposition areas, and layers of tuff forming over time.
Advantage(s) of tectonic activity in Iceland include(s): (1) Source of natural geothermal energy (2) Creation of new land (3) Attraction of tourists Select the correct answer using the code given below:
Correct Answer
📖 Core Anchor Concept
Tectonic activity in Iceland results from its position on the Mid-Atlantic Ridge, where the North American and Eurasian tectonic plates drift apart. This geological setting leads to several benefits.📜 Detailed Breakdown & Chronology
- **Geothermal Energy**: Iceland is rich in geothermal resources due to volcanic activity. Hot springs and geothermal power plants exploit these resources for sustainable energy. - **Land Creation**: Ongoing volcanic eruptions, such as those from the eruptive systems in the Reykjanes Peninsula, continuously add new land. This land formation significantly alters the landscape. - **Tourism Attraction**: Unique geological formations and geothermal features, such as the Blue Lagoon and geysers, attract millions of tourists annually, contributing to the economy.🔍 Option Analysis
- **Option A (1 only)**: Incorrect; while geothermal energy is a benefit, it is not the only one. - **Option B (2 and 3 only)**: Incorrect; excludes significant geothermal energy. - **Option C (1 and 3 only)**: Incorrect; excludes land creation through volcanism.⚡ Chronology Trick / Polity Mnemonic
Remember the acronym **GTL** (Geothermal, Topography, Leisure) to quickly recall the advantages associated with tectonic activity in Iceland.📖 Factual Verification & Reference
Verified against G.C. Leong’s "Physical Geography" and Icelandic geological studies.
Basket-of-eggs topography is related to
Correct Answer
📖 Core Anchor Concept
Basket-of-eggs topography describes a type of landscape characterized by Drumlins, which are elongated hills formed by glacial activity.
📜 Detailed Breakdown & Chronology
Drumlins are formed by the deposition of glacial till, shaped by the movement of ice. Key characteristics include:
- Typical height: 60-100 meters
- Length: ranges from hundreds of meters up to 1-2 kilometers
- Appearance: Resemble a cluster of eggs, smooth and rounded
🔍 Option Analysis
- B - Eskers: These are long, winding ridges formed by sediment deposition from meltwater rivers beneath glaciers.
- C - Cirques: Bowl-shaped depressions found at the head of a glacier, not related to Drumlins.
- D - Moraines: Accumulations of debris at the edges of glaciers, differing from drumlins in formation and structure.
⚡ Chronology Trick / Polity Mnemonic
Remember: **D** for Drumlins = **D** for **D**eposition; connect their shape with "B" for Basket semantics.
6. Visual Suggestion
A diagram illustrating Drumlins, showing their elongated shape, clusters resembling eggs, and geographical context in glacial regions.
📖 Factual Verification & Reference
Verified against G.C. Leong, "Physical Geography" for landform characteristics and glacial processes.
A large body of magmatic material that cools in the deeper depth of the Earths crust and develops in the form of large domes is known as
Correct Answer
📖 Core Anchor Concept
Batholiths are large igneous rock formations that originate when magma cools slowly beneath the Earth's surface, allowing crystals to grow large. This process is essential for the formation of continental crust.📜 Detailed Breakdown & Chronology
- **Formation**: Magma rises from the mantle, intruding over long periods into the crust but does not reach the surface. - **Cooling Process**: The slow cooling leads to the crystallization of minerals, forming granitic rock compositions typical of batholiths. - **Geographical Features**: Batholiths often form mountain ranges as they uplift surrounding rocks. Notable examples include the Sierra Nevada in California and Half Dome in Yosemite National Park.🔍 Option Analysis
- **A: Batholiths** - Large masses formed from cooled magma deep within the crust. - **B: Lacoliths** - Lens-shaped intrusions that cause the overlying strata to arch upward. - **C: Lopoliths** - Bowl-shaped intrusions formed when magma sinks into a depression. - **D: Phacoliths** - Small intrusions that form at the crest of folds, usually seen in schist and gneiss.⚡ Chronology Trick / Polity Mnemonic
Remember the "B" in Batholith signifies Big mass of cooled magma, differentiating it from other intrusions.6. Visual Suggestion
6. Visual Suggestion
A geological cross-section diagram showing the formation of a batholith deep within the Earth's crust, highlighting the magma intrusion and surrounding rock layers would provide clarity on the concept.
📖 Factual Verification & Reference
Verified against G.C. Leong's "Physical Geography" and various geological resources.
Fine-grained bed of ephemeral lake in a desert is also known as
Correct Answer
📖 Core Anchor Concept
Playas, also known as ephemeral lakes, are shallow basins found in desert climates that temporarily hold water during rare rainfall events, leading to sedimentation mainly consisting of fine-grained materials and salts.📜 Detailed Breakdown & Chronology
- **Formation**: During infrequent rainfall, water collects in low-lying areas, leading to temporary lakes. - **Evaporation**: High evaporation rates in arid climates cause water to dissipate quickly. - **Sedimentation**: Remaining water deposits fine sediments, creating a playa surface often rich in salts, termed alkaline flats. - **Geographical Distribution**: Common in locations like the American Southwest, Australia, and parts of Africa with arid conditions.🔍 Option Analysis
- **B: Oasis**: A fertile spot in a desert where water is found, supporting vegetation. - **C: Drumlin**: An elongated hill formed by glacial activity, not related to lake formations. - **D: Natural levee**: Raised banks along riverbanks formed from sediment deposits during flooding.⚡ Chronology Trick / Polity Mnemonic
Remember: **P.L.A.Y.A** - **P**layas **L**ake, **A**lkaline flats, **Y**ielding arid deposits, **A**ridity related.6. Visual Suggestion
6. Visual Suggestion
A diagram illustrating a playa’s geographical formation, highlighting seasonal water presence, sediment layers, and surrounding landscape in desert regions.
📖 Factual Verification & Reference
Verified against G.C. Leong's "Physical Geography" and other reliable geography sources.
Which one of the following factors does not affect the distribution of groundwater?
Correct Answer
📖 Core Anchor Concept
The distribution of groundwater is influenced by various environmental factors like precipitation, soil characteristics, and land cover. However, its connection with distance from the sea is less direct compared to other factors.
📜 Detailed Breakdown & Chronology
- Precipitation: Essential for recharging groundwater; affects both quantity and quality.
- Evaporation: Limits water availability; high rates can decrease groundwater levels.
- Soil Characteristics: Determines infiltration rates; sandy soils allow more infiltration compared to clayey soils.
- Infiltration Capacity: Area's ability to absorb water into the groundwater system is crucial for recharge.
🔍 Option Analysis
- Option A: Precipitation directly affects groundwater recharge and availability.
- Option B: High evaporation reduces moisture available for infiltration.
- Option C: Soil's type and structure directly influence aquifer replenishment.
- Option D: Distance from the sea is not a primary determinant for groundwater distribution.
⚡ Chronology Trick / Polity Mnemonic
Remember the mnemonic PIES for factors affecting groundwater: Precipitation, Infiltration, Evaporation, and Soil characteristics.
6. Visual Suggestion
A flowchart illustrating the factors affecting groundwater distribution, connecting precipitation, soil type, evaporation, and infiltration rates, with distance from the sea shown as a non-influential factor.
📖 Factual Verification & Reference
Verified against "Environmental Science: A Global Concern" by William Cunningham.
Which one of the following is not a soil forming factor?
Correct Answer
📖 Core Anchor Concept
Soil is a complex mixture of organic materials, minerals, and biological activity forming a thin layer on the Earth's surface. The main soil-forming factors include parent material, topography, climate, and vegetation, which significantly influence soil development and characteristics.📜 Detailed Breakdown & Chronology
- **Parent Material**: The mineral content and weathering of rock influence soil composition. - **Topography**: Elevation and slope affect drainage patterns and erosion, altering soil profiles. - **Climate**: Temperature and precipitation are crucial for processes like weathering and organic matter decomposition, vital for soil formation. - **Vegetation**: Plant life contributes organic matter through decay, enriching the soil.🔍 Option Analysis
- **A: Parent material**: A fundamental factor influencing soil type and nutrients. - **B: Topography**: Affects drainage and erosion, essential for soil formation. - **C: Climate**: Directly influences weathering and biological activity in soil formation. - **D: Human habitation**: While it affects land use and soil quality, it is not a natural soil-forming factor.⚡ Chronology Trick / Polity Mnemonic
Remember the acronym **PCTV** for soil formation factors: **P**arent material, **C**limate, **T**opography, and **V**egetation.📖 Factual Verification & Reference
Verified against NCERT Class 9 Geography, Chapter on Soil Resources.
Which one of the following features is the result of erosion and deposition work of a river?
Correct Answer
📖 Core Anchor Concept
Erosion and deposition by rivers are fundamental processes that shape the landscape, leading to the formation of features such as oxbow lakes. These occur when meanders are cut off, leaving behind a U-shaped body of water.📜 Detailed Breakdown & Chronology
- **Meander Formation**: As rivers flow, they meander, creating bends due to varying flow speeds. - **Erosion & Deposition**: Inside bends, sediment is deposited while outside bends experience erosion. - **Cut-off Formation**: Over time, the neck of a meander narrows and may eventually be breached, isolating the loop from the river and forming an oxbow lake.🔍 Option Analysis
- A: **Pothole**: A depression in rock formed by erosion, often associated with river flow but not a result of river meandering. - C: **Levee**: Natural or artificial embankments along riverbanks to prevent flooding, formed primarily through deposition. - D: **Rapid**: Sections of a river where water flows swiftly, indicative of steep gradients but not necessarily related to lakes.⚡ Chronology Trick / Polity Mnemonic
Remember: **Meanders** - **Erosion** - **Cut-off** - **Oxbow**, can help in recalling the sequence of oxbow lake formation.6. Visual Suggestion
6. Visual Suggestion
A diagram illustrating the meandering process and the formation of an oxbow lake, showing initial river flow, erosion, deposition points, and the eventual cut-off.
📖 Factual Verification & Reference
Verified against G.C. Leong's Physical Geography reference material.