Explanation

• Astigmatism is a vision defect caused by irregular curvature of the cornea or lens.
• It leads to blurred or distorted vision.
• Corrected using cylindrical lenses that adjust light focus properly.
• These lenses focus light in one direction to fix uneven curvature.
• Common in people of all ages.

Last verified on 02-05-2026

Explanation

• Active Remote Sensing sensors emit their own energy and then record the reflection.
• RADAR is a classic active sensor.
• It works using radio waves, even in darkness or cloudy weather.

Active vs Passive Sensors:

• LiDAR (Active)
• Multiband Scanner (Passive)
• Multiframe Camera (Passive)
• Ordinary Camera (Passive)

Last verified on 02-05-2026

Explanation

• Regression is a statistical method used for prediction and forecasting.
• It shows the relationship between dependent (yield) and independent variables (rainfall, temperature, etc.).
• Commonly used in agriculture to predict crop production.
• Helps in decision-making and planning.

Last verified on 02-05-2026

Explanation

• The total area of pakistan 881,913 km².
• Pakistan is a country in South Asia.
• Pakistan world's second-largest Muslim population.

Additional information:

• Pakistan is the 33rd-largest country by area.
• The total cultivated area in Pakistan is 25%.
• The total forest area of Pakistan is estimated at 6.20 million hectares.
• The forest cover of Pakistan is 5.7%.
• In old books area of Pakistan is 796096 sq km.

Last verified on 02-05-2026

Explanation

• A Gore is the area between two successive meridians on a map or globe.
• It looks like a curved wedge-shaped strip.
• Commonly used in map projections and globe construction.
• Helps in dividing the Earth into longitudinal sections.

Last verified on 02-05-2026

Explanation

• A Transition Zone is an area where two geographical regions meet.
• Boundaries are not clearly defined.
• It shows mixed characteristics of both regions.
• Common in climate, vegetation, and cultural regions.
• Also called a zone of gradual change.

Last verified on 02-05-2026

Explanation

• A Planimeter is used to measure area on maps.
• It calculates the area of irregular shapes accurately.
• Commonly used in cartography and surveying.
• Useful for measuring land parcels, fields, and regions.
• Works by tracing the boundary of a shape.

Map Measurement Tools:

• Curvimeter → distance along curves
• Compass → direction
• Altimeter → height/altitude
• Scale → distance calculation

Last verified on 02-05-2026

Explanation

• An Erograph is a diagram used in agriculture.
• It shows the relationship between crops and their growing seasons.
• It represents sowing, growing, and harvesting periods in a year.
• Helps in understanding cropping patterns and agricultural planning.

Last verified on 01-05-2026

Explanation

• Lake Baikal is the world’s deepest freshwater lake.
• Its water flows out through the Angara River.
• The Angara River is a tributary of the Yenisei River.
• Therefore, Lake Baikal ultimately drains into the Yenisei system.
• It is often called an “inland sea” due to its huge size.

Last verified on 01-05-2026

Explanation

The Danube River flows through 7 European countries.

1. Germany
2. Austria
3. Slovakia
4. Hungary
5. Croatia
6. Serbia
7. Romania

It is the second-longest river in Europe after the Volga.

• It passes through major cities like Vienna, Budapest, and Belgrade.
• It ultimately drains into the Black Sea.

Last verified on 01-05-2026