Surveying General Knowledge Objective Questions - Set 20 - ObjectiveBooks

# Practice Test: Question Set - 20

1. A lens or combination of lenses in which the following defect is completely eliminated is called aplanatic
(A) Spherical aberration
(B) Chromatic aberration
(C) Coma
(D) Astigmatism

2. Pick up the method of surveying in which field observations and plotting proceed simultaneously from the following
(A) Chain surveying
(B) Compass surveying
(C) Plan table surveying
(D) Tacheometric surveying

3. For orientation of a plane table with three points AB and C, Bessel's drill is
(A) Align b through a and draw a ray towards c, align a through b and draw a ray towards c, finally align c through the point of intersection of the previously drawn rays
(B) Align c through a and draw a ray towards b, align a through c and draw a ray towards b, finally align b through the point of intersection of the previously drawn rays
(C) Align c through b and draw a ray towards a, align b through c and draw a ray towards a, finally align a, through the point of intersection of the previously, drawn rays
(D) In the first two steps any two of the points may be used and a ray drawn towards the third point, which is sighted through the point of intersection of previously drawn rays in the final step.

4. Probable accidental error in precise levelling as recommended by International Geodetic Association should not exceed (where k is in kilometers.)
(A) ± 0.1 √k mm
(B) ± 0.5 √k mm
(C) ± 1 √k mm
(D) ± 5 √k mm

5. In a telescope the object glass of focal length 14 cm, is located at 20 cm from the diaphragm. The focussing lens is midway between them when a staff 16.50 m away is focussed. The focal length of the focussing lens, is
(A) 5.24 cm
(B) 6.24 cm
(C) 7.24 cm
(D) 8.24 cm

6. The main principle of surveying is to work
(A) From part to the whole
(B) From whole to the part
(C) From higher level to the lower level
(D) From lower level to higher level

7. If Δ is the angle of deflection of the curve, T1 and T2 are its points of tangencies, the angle between the tangent at T1 and long chord T1 T2 will be
(A) Δ/4
(B) Δ/3
(C) Δ/2
(D) Δ

8. The rise and fall method of reduction of levels, provides a check on
(A) Back sights
(B) Fore sights
(C) Intermediate sights
(D) All of these

9. The surface of zero elevation around the earth, which is slightly irregular and curved, is known as
(A) Mean sea level
(B) Geoid surface
(C) Level surface
(D) Horizontal surface

10. If the rate of gain of radial acceleration is 0.3 m per sec3 and full centrifugal ratio is developed. On the curve the ratio of the length of the transition curve of same radius on road and railway, is
(A) 2.828
(B) 3.828
(C) 1.828
(D) 0.828

11. The apparent error on reversal is
(A) Equal to the actual error
(B) Twice the actual error
(C) Thrice the actual error
(D) None of these

12. If the long chord and tangent length of a circular curve of radius R are equal the angle of deflection, is
(A) 30°
(B) 60°
(C) 90°
(D) 120°

13. In precision theodolite traverse if included angles are read twice and the mean reading accepted using both verniers having a least count of 30". Assuming the instrument to be in perfect adjustment, linear measurements correct to 6 mm per 30 metre tape duly corrected for temperature, slope and sag, the angular error of closure not to exceed (where n is the number of traverse legs)
(A) 50" √n
(B) 30" √n
(C) 60" √n
(D) None of these

14. The diaphragm of a stadia theodolite is fitted with two additional
(A) Horizontal hairs
(B) Vertical hairs
(C) Horizontal and two vertical hairs
(D) None of these

15. Magnetic bearing of a survey line at any place
(A) Remains constant
(B) Changes systematically
(C) Varies differently in different months of the year
(D) Is always greater than true bearing

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