Question
Which technology was used to discover a lost Mayan city
in the Mexican jungle?Solution
Discovery of Lost Mayan City Using LiDAR -      Location: Mexican jungle -      Discovery: Lost Mayan city revealed beneath dense vegetation -      Technology Used: LiDAR (Light Detection and Ranging) , which penetrated the jungle canopy to reveal ancient structures What is LiDAR?                -      Definition: A remote sensing method using light pulses to measure distances and create 3D surface models -      Accuracy: Can achieve up to 10 cm vertical accuracy (US Geological Survey) - Components: -      Laser: Emits rapid pulses toward the ground -      Scanner: Collects reflected light to measure distance -      GPS Receiver: Provides precise geographic location for each data point How Does LiDAR Work? - Process: -      Laser pulses are directed at surfaces (trees, buildings, ground) -      Light reflects back to the sensor -      The time for reflection is measured to calculate the distance -      GPS adds exact location data to each point, ensuring geographical accuracy Applications of LiDAR -      Forestry: Measures tree height and density -      Urban Planning: Maps infrastructure -      Archaeology: Reveals hidden sites (e.g., Mayan city) -      Environmental Science: Flood modeling and landscape change assessment Advantages of LiDAR -      Speed: Quickly covers large areas -      Accessibility: No need for physical ground access; ideal for dense or hard-to-reach areas -      Accuracy: Provides high-resolution terrain data useful for various scientific fields Limitations of LiDAR -      Cost: Expensive to deploy and operate -      Skill Requirement: Requires skilled operators and specialized equipment -      Weather Sensitivity: Heavy rain or fog can reduce data quality
(106 + 14)/15 = ?/5
- Which of the following expressions are equal?
'A' = 81 ÷ 9 × 6 - 27
'B' = (3/2) × (40/3) + 30 ÷ 6
'C' = (40 + 12 - 22) ÷ 6 × 5 - The value of 15 3  + 14 3  – 18 3  is equal to:
30% of 8/5 × 5/7 × 2870 =?
What will come in the place of question mark (?) in the given expression?
? = 60% of 48% of (20 × 350) + 180
24 × ?2 – 11 × 4 = 1900
110 ÷ 5.5 + (?)3 ÷ 12 = 20(2/3)
540240 ÷ 24 ÷ 25 =?
√ (573 – 819 + 775) = ? ÷ 3
1300% of 2341 + 1200% of 6321 = ?