Surveying problems
- 1. Pick up the correct statement from the following :
Options- A. the apparent error on reversal is twice the actual error
- B. the correction may be made equal to half the observed discrepancy.
- C. the good results may be obtained from a defective instrument by reversing and taking the mean of two erroneous results
- D. all the above. Discuss
Correct Answer: all the above.
- 2. In chain surveying tie lines are primarily provided
Options- A. to check the accuracy of the survey
- B. to take offsets for detail survey
- C. to avoid long offsets from chain lines
- D. to increase the number of chain lines. Discuss
Correct Answer: to avoid long offsets from chain lines
- 3. The probable error of the adjusted bearing at the middle is
Options- A.
rn - B.
rn - C.
rn - D.
rn.
Discuss
Correct Answer:
rn - 4. The real image of an object formed by the objective, must lie
Options- A. in the plane of cross hairs
- B. at the centre of the telescope
- C. at the optical centre of the eye-piece
- D. anywhere inside the telescope. Discuss
Correct Answer: in the plane of cross hairs
- 5. If ? is the vertical angle of an inclined sight, ? is the angle of tilt of the staff, the error
Options- A.
- B.
- C.
- D. none of these. Discuss
Correct Answer:
- 6. If R is the radius of the main curve, ? the angle of deflection, S the shift and L the length of the transition curve, then, total tangent length of the curve, is
Options- A. (R - S) tan ?/2 - L/2
- B. (R + S) tan ?/2 - L/2
- C. (R + S) tan ?/2 + L/2
- D. (R - S) tan ?/2 + L/2
- E. (R - S) cos ?/2 + L/2 Discuss
Correct Answer: (R + S) tan ?/2 + L/2
- 7. While viewing through a level telescope and moving the eye slightly, a relative movement occurs between the image of the levelling staff and the cross hairs. The instrument is
Options- A. correctly focussed
- B. not correctly focussed
- C. said to have parallax
- D. free from parallax. Discuss
Correct Answer: said to have parallax
- 8. Accuracy of 'fix' by two point problem, is
Options- A. bad
- B. good
- C. not reliable
- D. unique. Discuss
Correct Answer: not reliable
- 9. One of the tacheometric constants is additive, the other constant, is
Options- A. subtractive constant
- B. multiplying constant
- C. dividing constant
- D. indicative constant. Discuss
Correct Answer: multiplying constant
- 10. One of the Lehmann's rules of plane tabling, is
Options- A. location of the instrument station is always distant from each of the three rays from the known points in proportion to their distances
- B. when looking in the direction of each of the given points, the instrument station will be on the right side of one and left side of the other ray
- C. when the instrument station is outside the circumscribing circle its location is always on the opposite side of the ray to the most distant point as the inter-section of the other two rays
- D. none of these. Discuss
Correct Answer: location of the instrument station is always distant from each of the three rays from the known points in proportion to their distances
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