38. Which type of survey cannot be done in dense wooded areas?
(A) Chain survey (B) Compass survey
(C) Plane table survey (D) Theodolite survey

39. The three points problem may be solved by
(A) Tracing paper method (B) Bessel's method
(C) Trial and Error method (D) All of the above

40. What is the term that is normal to plumb line at all points?
(A) Level surface (B) Datum surface
(C) Horizontal surface (D) Vertical surface

41. What is the benchmarks established between the G.T.S. benchmarks by the state PWD | `
is known as

(A) Arbitrary benchmark (B) Permanent benchmark
(C) Temporary benchmark (D) G.T.S. benchmark

42. Which level is used for precise levelling work?
(A) Auto level (B) Dumpy level
(C) Wye level (D) Tilting level

43. In which staff consist of three parts and one slides into another?
(A) Telescopic staff (B) Invar staff
(C) Target staff (D) Folding staff

44. What is the smallest graduated division in levelling staff?
(A) 0.5 m (8) .05 11
(൭) 005 71 (D) 0.0005m

45. Which method of contour is suitable for small and undulating area?
(A) By levelling method (B) By cross section
(C) By tacheometric method (D) By square method

46. Which method is not included in the interpolation of contours?
(A) Estimation (B) Arithmetical calculation
(C) Cross section (D) Graphical

47. Combined correction for curvature and refraction is
(A) 0.6723 D2 (B) 0.0673D2
(C) 0.0112D2 )6( 011202

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