Surveying in Civil Engineering Practice Tests - Set 18 - ObjectiveBooks

# Practice Test: Question Set - 18

1. The distance between steps for measuring downhill to obtain better accuracy
(A) Decreases with decrease of slope
(B) Increases with increase of slope
(C) Decreases with increase of slope
(D) Decreases with decrease of weight of the chain

2. The boundary of water of a still lake represents
(A) Level surface
(B) Horizontal surface
(C) Contour line
(D) A concave surface

3. The 10 mm markings on a levelling staff placed at 20 m are separated by

4. The sensitiveness of a level tube decreases if
(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

5. The orthographical projection of a traverse leg upon the reference meridian, is known as
(A) Departure of leg
(B) Latitude to the leg
(C) Co-ordinate of the leg
(D) Bearing of the leg

6. The distances AC and BC are measured from two fixed points A and B whose distance AB is known. The point C is plotted by intersection. This method is generally adopted in
(A) Chain surveying
(B) Traverse method of surveys
(C) Triangulation
(D) None of these

7. The defect of a lens whereby rays of white light proceeding from a point get dispersed into their components and conveyed to various foci, forming a blurred and coloured image is known as
(A) Chromatic aberration
(B) Spherical aberration
(C) Astigmatism
(D) Coma

8. A uniform slope was measured by the method of stepping. If the difference in level between two points is 1.8 m and the slope distance between them is 15 m, the error is approximately equal to
(A) Cumulative, + 0.11 m
(B) Compensating, ± 0.11 m
(C) Cumulative, - 0.11 m
(D) None of these

9. Systematic errors are those errors
(A) Which cannot be recognised
(B) Whose character is understood
(C) Whose effects are cumulative and can be eliminated
(D) None of these

10. A dumpy level was set up at mid-point between pegs A and B, 80 m apart and the staff readings were 1.32 and 1.56. When the level was set up at a point 10 m from A on BA produced, the staff readings obtained at A and B were 1.11 and 1.39. The correct staff reading from this set up at S should be
(A) 1.435
(B) 1.345
(C) 1.425
(D) None of these

11. A transit is oriented by setting its vernier A to read the back azimuth of the preceding line. A back sight on the preceding transit station taken and transit is rotated about its vertical axis. The vernier A reads
(A) Azimuth of the forward line
(B) Bearing of the forward line
(C) Back bearing of the forward line
(D) Equal to 360°-azimuth of the forward line

12. Two hill tops ‘A’ and ‘B’ 20 km apart are intervened by a third top ‘C’. If the top most contour of the three hill tops are of the same value, state whether the line of sight AB
(A) Passes clear of hill top C
(B) Passes below the hill top C
(C) Grazes the hill top C
(D) None of these

13. The bearings of two traverse legs AB and BC are N52° 45' E and N34° 30' E respectively. The deflection angle is
(A) 18° 15' E
(B) 18° 15' N
(C) 18° 15' W
(D) 18° 15' L

14. In a theodolite
(A) The telescope axis is perpendicular to transit axis
(B) The axis of rotation is perpendicular to transit axis
(C) The telescope axis, the transit axis and the rotation axis pass through the centre of theodolite
(D) All the above

15. For taking offsets with an optical square on the right hand side of the chain line, it is held
(A) By right hand upside down
(B) By left hand upright
(C) By right hand upright
(D) By left hand upside down

Show and hide multiple DIV using JavaScript View All Answers