SENAPREP
Atmosphere & Climate Questions
Chapter: Geography | Total Available: 38 Real Questions
. AccordingtotheIndianMeteorologicalDepartment, which of the following is/are thefeature/features of cloudburst?
1. Heavy precipitation in short period of timein a limited geographical area
2. It occurs generally during monsoon periodand triggers flash flood and landslidesSelect the correct answer using the code givenbelow.
Correct Answer
📖 Core Anchor Concept
Cloudburst is a meteorological event characterized by intense rainfall in a short duration, significantly exceeding ordinary rain, and typically occurs in a localized area.📜 Detailed Breakdown & Chronology
- Heavy Precipitation: Defined as rainfall exceeding 100 mm/h, generally occurring over a small geographical area of 20-30 square kilometers.
- Seasonal Occurrence: Primarily observed during the monsoon season, when the moisture-laden clouds drift over a mountainous region, leading to sudden downpours.
- Impact: Such rainfall can trigger flash floods and landslides, especially in hilly areas, posing significant risks to life and property.
🔍 Option Analysis
- Option A (1 only): Incomplete, as it neglects the significance of the monsoon period.
- Option B (2 only): Incomplete, as it fails to mention the intensity of precipitation characteristic.
- Option D (Neither 1 nor 2): Incorrect, as both statements are true regarding cloudbursts.
⚡ Memory Hook (Mnemonic)
For cloudburst features, remember "Heavy during Monsoon":- H: Heavy rain
- M: Monsoon season
- T: Triggers floods
6. Visual Suggestion
6. Visual Suggestion
A diagram illustrating the process of cloud formation leading to cloudburst, showing moisture-laden clouds, geographical features (like mountains), and arrows indicating the direction of rain. Include annotations for flash floods and landslides to better comprehend the impact.
📖 Factual Verification & Reference
Verified against Meteorological studies and guidelines, including the Indian Meteorological Department publications.
Where is the Coriolis effect the largest?
Correct Answer
📖 Core Anchor Concept
The Coriolis effect describes the apparent deflection of moving objects caused by Earth’s rotation and is strongest at the poles where latitude reaches 90°.
📜 Detailed Breakdown & Chronology
The Coriolis effect varies with latitude, reaching zero at the Equator (0°) and increasing toward the poles:
- At the Equator: No Coriolis effect.
- At \(30^\circ\) latitude: Moderate Coriolis effect.
- At \(90^\circ\) latitude (North and South Pole): Maximum Coriolis effect.
This phenomenon is crucial for understanding wind patterns, ocean currents, and weather systems on a global scale.
🔍 Option Analysis
- A: At the Equator - The effect is negligible.
- B: At the Tropic of Capricorn and Cancer - The effect is present but lower than at the poles.
- D: At \(45^\circ\) latitude in each hemisphere - While the effect is significant, it is not maximum.
⚡ Chronology Trick / Polity Mnemonic
Remember: "Coriolis is Capped at the Corners" to recall that the effect peaks at the poles.
Verified against standard meteorological texts and Earth's physical geography references.
What happens when the sunlight travels through the Earth’s atmosphere ?
1. Correct Answer
Option A is correct. Sunlight scattering leads to blue light being scattered more than red light.
📖 Core Concept
Sunlight passing through Earth's atmosphere is subject to scattering, which depends on the wavelength of light, resulting in distinct sky colors.
💡 3. Explanation
❌ 4. Option Analysis
- •Option B: Incorrect as red light with a longer wavelength scatters less.
- •Option C: Incorrect because different wavelengths scatter at different intensities, they are not equal.
- •Option D: Incorrect since blue light is indeed scattered more than red, contradicting this statement.
NDA Speed-Run / Mnemonic Shortcut
Remember "Blue Scatters": Short wavelengths scatter more in the atmosphere, making the sky appear blue.
5. Key Takeaways
Blue light is scattered more than red light, resulting in a blue sky.
Which one of the following latitudes will experience a minimum angle of the Sun’s rays when it is Summer Solstice in the NorthernHemisphere?
1. Correct Answer
Option D is correct. The Tropic of Capricorn experiences the minimum angle of the Sun's rays during the Summer Solstice in the Northern Hemisphere.
📖 Short Explanation
On the Summer Solstice, the Sun is directly overhead at the Tropic of Cancer, so locations further south, like the Tropic of Capricorn, receive sunlight at more oblique angles, experiencing the most indirect rays.
💡 3. Why Correct Answer is Correct
❌ 4. Why Other Options are Wrong
- •Option A: The Arctic Circle experiences 24 hours of daylight, making it impossible for the Sun's rays to be at their minimum angle.
- •Option B: The Equator receives relatively consistent sunlight year-round and doesn’t experience a significant minimum angle during the solstice.
- •Option C: The Tropic of Cancer, being directly under the Sun during the solstice, receives sunlight at the maximum angle, not the minimum.
NDA Speed-Run / Mnemonic Shortcut
Remember the Tropics: Cancer for maximum Sun (June) and Capricorn for minimal Sun (December), switched by hemispheres.
5. Key Learning Point
During solstices, opposite tropics experience maximum and minimum Sun angles respectively due to Earth's tilt.
6. Visual Suggestion
Visualize the Earth with two tropics and the Equator. Show the Sun overhead at Tropic of Cancer and the reduced angle at Tropic of Capricorn during the Summer Solstice.
Which of the following statements withreference to Coriolis force is/are correct?
1. Coriolis force acts perpendicular to the pressure gradient force.
2. At the equator, the Coriolis force is zero and the wind blows perpendicular to the isobars.
Select the answer using the code given below:
1. Correct Answer
Option C is correct. Both statements are true regarding the Coriolis force.
📖 Short Explanation
The Coriolis force influences the movement of winds due to Earth's rotation. It acts perpendicularly to the pressure gradient and is zero at the equator.
💡 3. Why Correct Answer is Correct
The Coriolis force is a result of Earth's rotation, causing moving objects to deviate to the right in the Northern Hemisphere and to the left in the Southern Hemisphere. It influences the direction of the wind by acting perpendicular to the pressure gradient force. Thus, statement 1 is correct.
At the equator, the Coriolis force is effectively zero, resulting in winds not being deflected and generally flowing perpendicular to the isobars, making statement 2 also correct.
❌ 4. Why Other Options are Wrong
- •Option A: Statement 1 is correct, but selecting “1 only” ignores the validity of statement 2, which is also correct.
- •Option B: It correctly identifies statement 2 but does not take into account the correctness of statement 1.
- •Option D: Choosing “neither” suggests both statements are false, which is incorrect as both are true.
NDA Speed-Run / Mnemonic Shortcut
Remember, Coriolis force is zero at the equator, winds are not deflected and thus, equatorial winds blow perpendicular to isobars.
5. Key Learning Point
The Coriolis force's impact on wind direction is significant, particularly its zero influence at the equator.
6. Visual Suggestion
Create a diagram showing the Earth with arrows representing wind directions at different latitudes, indicating the Coriolis effect deflection directions and zero deflection at the equator.
Which of the following statements with reference to sleet is/are correct?
1. Sleet is frozen rain drops and refrozenmelted snow-water.
2. It occurs when a layer of air with the temperature below freezing point over liesa warm layer near the ground surface.
Select the answer using the code given below:
1. Correct Answer
Option A is correct. Sleet is frozen raindrops and refrozen melted snow-water.
📖 Short Explanation
Sleet is a type of precipitation formed by frozen raindrops and refrozen melted snow-water, occurring under specific atmospheric conditions.
💡 3. Why Correct Answer is Correct
❌ 4. Why Other Options are Wrong
- •Option B: Statement 2 is incorrect because sleet requires a subfreezing layer near the surface, not above a warm layer.
- •Option C: While statement 1 is correct, statement 2 is not, making this choice incorrect.
- •Option D: This is incorrect because statement 1 is actually correct.
NDA Speed-Run / Mnemonic Shortcut
Remember "Sleet Slides When Freezing Meets," highlighting how sleet is formed as precipitation moves from a warm layer to a colder, freezing layer before reaching the ground.
5. Key Learning Point
The formation of sleet requires raindrops to pass through a subfreezing layer near the surface, causing them to freeze or refreeze.
6. Visual Suggestion
A cross-sectional diagram depicting the atmospheric layers: showing a layer of air above the freezing point overlaying a subfreezing layer near the ground, highlighting the path of raindrops as they freeze in different layers.
Humid subtropical climate is NOT experienced in which one among the following regions?
1. Correct Answer
Option D is correct. Humid subtropical climate is not experienced in South Argentina.
📖 Short Explanation
The humid subtropical climate, denoted as Cfa/Cwa in the Köppen climate classification, is typically associated with hot, humid summers and mild winters. It is found along the eastern coasts of continents between 25° and 40° latitudes.
💡 3. Why Correct Answer is Correct
❌ 4. Why Other Options are Wrong
- •Option A: Coastal South Africa experiences a humid subtropical climate with warm, humid summers and mild winters.
- •Option B: The East Coast of Australia experiences humid subtropical conditions, featuring hot, moist summers, aligning perfectly with the climate description.
- •Option C: South Japan is characterized by a humid subtropical climate, marked by hot summers and moderate winters.
NDA Speed-Run / Mnemonic Shortcut
Remember that humid subtropical climates are found at latitudes between 25° and 40° on the eastern sides of continents; if the location is outside this range or not on an east coast, it likely doesn't fit.
5. Key Learning Point
Humid subtropical climates are associated with the eastern coastlines of continents at specific latitudes, marked by hot summers and mild winters.
6. Visual Suggestion
A world map highlighting regions between 25° and 40° latitudes on the eastern coasts. Annotate regions experiencing humid subtropical climates like parts of the USA (including southeastern states), Brazil, eastern Australia, and China while contrasting with Patagonia in Argentina.
Consider the following statements with reference to structure of the Earth’s atmosphere:
1. Thickness of the troposphere is greatest at the equator
2. The air temperature of the tropopause is highest above the poles
3. The temperature in troposphere decreases at the rate of 1°F for every 165 m of height
Which of the statements given above is/arecorrect?
Correct Answer
📖 Core Anchor Concept
The troposphere is the lowest layer of the Earth's atmosphere, where most weather occurs, and it is characterized by a temperature decrease with height. Its thickness varies with latitude, being greatest near the equator.
📜 Detailed Breakdown & Chronology
- Statement 1: Correct. The troposphere's thickness increases due to intense solar heating at the equator, reaching about 18 km compared to 8 km above the poles.
- Statement 2: Incorrect. The tropopause is coldest over polar regions, with temperatures dropping significantly, while it is warmer at lower latitudes.
- Statement 3: Incorrect. The average temperature lapse rate in the troposphere is approximately 6.5°C per 1000m, which equates to about 1°F per 300m, not 165 m.
🔍 Option Analysis
Options (b), (c), and (d) include incorrect combinations as they rely on the false claims made in statements 2 and 3.
⚡ Chronology Trick / Polity Mnemonic
Remember: "Equator = Thick Troposphere" (higher temperature, thicker layer).
📖 Factual Verification & Reference
Verified against NCERT Class 11 Geography, Chapter 6 (Climate).
Which of the following are the factors that cause variation in the amount of insolation onthe Earth?
1. Rotation of the earth on its axis
2. Length of the day
3. Distribution of land and water on the earth
Select the answer using the code given below:
Correct Answer
📖 Core Anchor Concept
The variation in insolation on Earth is influenced by several interconnected factors, namely:
📜 Detailed Breakdown & Chronology
- Rotation of the Earth: The diurnal rotation of the Earth on its axis leads to alternating day and night, influencing solar exposure to different regions.
- Length of the Day: Variations in the length of day, particularly across different seasons, affect the duration of sunlight received, thereby impacting insolation levels.
- Distribution of Land and Water: Land and water absorb and release heat at different rates, affecting local climates and heat distribution more broadly.
🔍 Option Analysis
- Option A (1 only): Incomplete, as it ignores other significant factors.
- Option B (1 and 2 only): Also incomplete; it overlooks land-water distribution.
- Option C (2 and 3 only): Excludes the critical effect of Earth's rotation.
⚡ Chronology Trick / Polity Mnemonic
To remember the three factors: Relative Duration and Land-Water Distribution (RDL). This mnemonic encapsulates rotation, length of the day, and land-water distribution.
📖 Factual Verification & Reference
Verified against NCERT Class XI Geography, Chapter on Climatology.
Consider the following conditions favourable for the formation and intensification of TropicalStorms:
1. Presence of the Coriolis force
2. Upper divergence above the sea level system
3. High variations in the vertical wind speed
Which of the conditions given above is/arecorrect?
Correct Answer
📖 Core Anchor Concept
Tropical storms require specific atmospheric conditions for development and intensification, primarily involving the Coriolis force and upper-level divergence.
📜 Detailed Breakdown & Chronology
- 1. Presence of the Coriolis Force: This force results from the Earth's rotation and is essential for imparting rotational motion to storms, making it a fundamental requirement for the formation of tropical storms, particularly in the tropics.
- 2. Upper Divergence: This occurs when air spreads out above a low-pressure system, allowing surface air to rise. This reduction in pressure at the surface triggers further storm development by facilitating continuous updrafts.
- 3. High Variations in Vertical Wind Speed: Contrary to favorable conditions, significant wind shear can inhibit storm formation by disrupting the organized structure of the storm, thus making this condition unfavorable.
🔍 Option Analysis
- A: 1 only - Incorrect; ignores the importance of upper divergence.
- B: 2 only - Incorrect; overlooks the necessity of the Coriolis force.
- D: 2 and 3 - Incorrect; includes an unfavorable condition that disrupts storm formation.
⚡ Chronology Trick / Polity Mnemonic
Remember: "Coriolis Creates, Divergence Drives." This mnemonic can help recall the importance of both the Coriolis effect and upper-level divergence in storm dynamics.
📖 Factual Verification & Reference
Verified against standard climatology texts focusing on tropical meteorology and ECMWF (European Centre for Medium-Range Weather Forecasts).