Surveying and Levelling

21. ABCD is a rectangular plot of land. If the bearing of the side AB is 75°, the bearing of DC is

1. 75°
2. 255°
3. 105°
4. 285°

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22. ABCD is a regular parallelogram plot of land whose angle BAD is 60°. If the bearing of the line AB is 30°, the bearing of CD, is

1. 90°
2. 120°
3. 210°
4. 270°

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23. Accidental or compensating errors of length 'L' are proportional to

1. L
2. √L
3. ∛L
4. L/∛L

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24. Accuracy of elevation of various points obtained from contour map is limited to

1. ½ of the contour interval
2. ¼ th of the contour interval
3. ⅓ rd of the contour interval
4. ⅕ th of the contour interval

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25. Accuracy of 'fix' by two point problem, is

1. Bad
2. Good
3. Not reliable
4. Unique

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26. Accurate measurement of deflection angles with a transit not properly adjusted may be made by

1. Setting the Vernier A at zero at back station and then plunging the telescope
2. Setting the Vernier A at zero at back station and turning the instrument to the forward station
3. Taking two back sights one with the telescope normal and the other with telescope inverted
4. None of these

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27. After fixing the plane table to the tripod, the main operations which are needed at each plane table station are
(i) Levelling
(ii) Orientation
(iii) Centering
The correct sequence of these operations is

1. (i), (ii), (iii)
2. (i), (iii), (ii)
3. (iii), (i), (ii)
4. (ii), (iii), (i)

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28. An angle of 45° with a chain line may be set out with

1. Optical square
2. Open cross staff
3. French cross staff
4. Prismatic square

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29. An angle of deflection right, may be directly obtained by setting the instrument to read

1. Zero on back station
2. 180° on back station
3. 90°
4. 270° on back station

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30. An ideal transition curve is

1. Cubic parabola
2. Cubic spiral
3. Clothoid spiral
4. True spiral

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