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QUESTION: 1

During levelling if back sight is more than foresight

Solution:

QUESTION: 2

In reciprocal levelling, the error which is not completely eliminated, is due to

Solution:

QUESTION: 3

Match List-I with List-ll and select the correct answer using the codes given below the lists:

List-I

A. Reciprocal levelling

B. Trigonometrical levelling

C. Hypsometry

D. Profile levelling

List-ll

1. Involves measuring of horizontal distances and vertical angles in field

2. Involves the principle of boiling point of water variation with altitude

3. Involves observing elevations of a number of points along the centre line and their distance along it

4. Involves the principle of two peg test

Solution:

QUESTION: 4

The RL, of the point A which is on the floor is 100 m and back sight reading on A is 2.455 m. If the foresight reading on the point B which is one the ceiling is 2.745 m, the RL of point B will be

Solution:

Since the staff at the elevated point B on the ceiling is held vertically inverted

RL of B = RL of A + B.S.on A + FS on B

= 100 + 2.455 + 2.745 = 105.20 m

QUESTION: 5

The following consecutive readings were taken with a dumpy level:

0.635, 1.525, 2.395, 0.605, 0.805, 0.125

The instrument was shifted after the third and fifth readings. The readings 2.395 and 0.635 respectively represents

Solution:

QUESTION: 6

A level was set up at a point A and distance to the staff station B was 100 m. The net combined correction due to curvature and refraction as applied to the staff reading is

Solution:

Net combined correction

= -0.0673 d^{2}. metres where d is in kms

QUESTION: 7

An observer standing on the deck of a ship just sees the top of a lighthouse which is 30 m above the sea level. If the height of the observer’s eye is 10 m above the sea level, then the distance of the observer from the lighthouse will be nearly

Solution:

QUESTION: 8

If the staff intercept on a staff located at 100 m from the level for five division deviation of the bubble is 0.050 m and if the length of one division of the bubble is 2 mm, then the radius of curvature of the bubble tube is

Solution:

The radius of curvature of bubble is given by,

QUESTION: 9

Two points A and B are 1530 m apart across a river. The reciprocal levels measured are

The true difference in level between A and B would be

Solution:

True difference in levels,

Error in collimation adjustment

When the level is at A, the reading on the staff at A is correct. While reading on the staff at B is incorrect. When the level is at B, the reading on the staff at B is correct while reading on the staff at A is incorrect.

Correct readings are

QUESTION: 10

If the observed staff reading at a station is 800.925 m the correction due to refraction is 0.115 m and correction due to curvature is 0.805. Then the correct staff reading will be

Solution:

True staff reading = obs. staff reading - curve corr. + refr. corr.

= 800.925 - 0.805 + 0.115

= 800.235 m

### Levelling Staff, Surveying and Levelling

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