Levelling Part 3

What is the another name of assumed bench mark?

• GTS bench mark
• Permanent bench mark
• Arbitrary Benchmark
• Temporary bench mark

The bench marks used in small levelling are

• GTS Benchmark
• Permanent Benchmark
• Arbitrary Benchmark
• Temporary Benchmark

During a fly levelling the plinth of a nearby building is selected as benchmark and its RL is assumed as +50.00. Then the selected BM is an example of

• GTS BM
• Temporary BM
• Arbitrary BM
• Permenent BM

The constant __________ between two consecutive contours is called contour interval

• Height
• Horizontal distance
• Difference of level
• Interval

The still water surface of a pond represent a __________ surface

• Horizontal
• Vertical
• Level
• Inclined

When viewed through a telescope the staff reading is seen :

• Incorrect
• Correct
• Inverted
• None of these

The advantage of reciprocal levelling is that

• It eliminates the error due to curvature and refraction
• It eliminates collimation error
• All of these
• None of these

The shortest distance between two places measured along the surface of the earth is :

• Length of the equator between their longitudes
• Length of the parallel between their longitudes
• Length of the arch of the great circle passing through them
• None of the above

When levelled, a level provides :

• Level line of sight
• Angular
• Horizontal line of sight
• None of these

An arbitrary surface with reference to which the elevation of points are measured and compared, is called :

• Level surface
• Horizontal surface
• Datum surface
• Vertical surface