The bearings of the lines AB and BC are 146� 30' and 68� 30'. The included angle

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Question
The bearings of the lines AB and BC are 146� 30' and 68� 30'. The included angle ABC is
Options
A. 102�
B. 78�
C. 45�
D. none of these.

Correct Answer

102�

Surveying problems

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1. Offsets are measured with an accuracy of 1 in 40. If the point on the paper from both sources of error (due to angular and measurement errors) is not to exceed 0.05 cm on a scale of 1 cm = 20 m, the maximum length of offset should be limited to
Options
A. 14.14
B. 28.28 m
C. 200 m
D. none of these.

2. True meridians are generally preferred to magnetic meridians because
Options
A. these converge to a point
B. these change due to change in time
C. these remain constant.
D. None of these.

3. If f₁ and f₂ are the distances from the optical centre of a convex lens of focal length f to conjugate two points P₁ and P₂ respectively, the following relationship holds good
Options
A. f = f₁ + f₂
B. f = (f₁ + f₂)
C.
D. none of these.

4. The limiting length of an offset does not depend upon
Options
A. accuracy of the work
B. method of setting out perpendiculars
C. scale of plotting
D. indefinite features to be surveyed.

5. The sensitiveness of a level tube decreases if
Options
A. radius of curvature of its inner surface is increased
B. diameter of the tube is increased
C. length of the vapour bubble is increased
D. both viscosity and surface tension are increased.

6. For the construction of highway (or railway)
Options
A. longitudinal sections are required
B. cross sections are required
C. both longitudinal and cross sections are required
D. none of these.

9. The accuracy of measurement in chain surveying, does not depend upon
Options
A. length of the offset
B. scale of the plotting
C. importance of the features
D. general layout of the chain lines.

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