Geography: Understanding Datum and Mean Sea Level
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Questions and Answers

What is the reference point with respect to which the levels of other points or planes are calculated?

  • Benchmarks
  • Vertical Line/Axis
  • Datum or datum surface (correct)
  • Mean Sea Level (MSL)
  • What is the average height of the sea for all stages of the tides?

  • Reduced Level (RL)
  • Benchmarks
  • Mean Sea Level (MSL) (correct)
  • Datum or datum surface
  • What is the level of a point taken as height above the datum surface?

  • Benchmarks
  • Datum or datum surface
  • Mean Sea Level (MSL)
  • Reduced Level (RL) (correct)
  • What is a relatively permanent reference point, the elevation of which is known with respect to Mean Sea Level (MSL)?

    <p>Benchmarks (A)</p> Signup and view all the answers

    What is the highest precision benchmark established by a national agency in India?

    <p>GTS Benchmark (D)</p> Signup and view all the answers

    Where is the elevation of all GTS benchmarks established with respect to Mean Sea Level (MSL) in India?

    <p>Karachi (B)</p> Signup and view all the answers

    What is the purpose of establishing benchmarks in levelling?

    <p>To determine the difference in elevations of neighbouring points (C)</p> Signup and view all the answers

    What is the characteristic of a temporary benchmark?

    <p>It is established at the end of the day's work (A)</p> Signup and view all the answers

    What is the function of the level tube in a levelling instrument?

    <p>To make the line of sight horizontal (A)</p> Signup and view all the answers

    What is the purpose of the metal shoe at the bottom of a levelling staff?

    <p>To resist wear and tear (B)</p> Signup and view all the answers

    What is the GTS benchmark used for?

    <p>To establish a permanent benchmark with reference to mean sea level (D)</p> Signup and view all the answers

    What does the foot of the metal shoe of a levelling staff represent?

    <p>The zero reading (A)</p> Signup and view all the answers

    What is the primary purpose of check lines?

    <p>To measure the accuracy of main station locations (C)</p> Signup and view all the answers

    What type of measurements are taken to locate ground features?

    <p>Offset measurements (C)</p> Signup and view all the answers

    What is the characteristic of a base line?

    <p>It is the longest line (D)</p> Signup and view all the answers

    What is the purpose of selecting secondary stations on main lines?

    <p>To locate interior details (B)</p> Signup and view all the answers

    What are the two methods used for setting perpendicular offsets?

    <p>Swinging and using cross staffs (B)</p> Signup and view all the answers

    What is the consideration for selecting station points?

    <p>It should be visible from at least two or more stations (D)</p> Signup and view all the answers

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