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Civil Engineering :: Surveying

  1. The normal longitudinal overlap is generally kept

  2. A.

     50 %

    B.

     60 %

    C.

     70 %

    D.

     75 %


  3. The difference of parallax for a given difference in elevation is independent of

  4. A.

     Focal length of the camera

    B.

     Overall size of the photo graphs

    C.

     Percentage of overlap

    D.

     All the above


  5. If the focal length of the object glass is 25 cm and the distance from object glass to the trunnion axis is 15 cm, the additive constant is

  6. A.

     0.1

    B.

     0.4

    C.

     0.6

    D.

     1.33


  7. Latitude of a place is the angular distance from

  8. A.

     Greenwich to the place

    B.

     Equator to the poles

    C.

     Equator to the nearer pole

    D.

     None of these


  9. If α, H, A and δ be the altitude, hour angle, azimuth and declination of a circumpolar star at its elongation, in latitude λ, the following relation holds good

  10. A.

     cos H = tan λ/tan δ

    B.

     sin α = sin λ/sin δ

    C.

     sin A = cos δ/cos λ

    D.

     All the above


  11. The latitude (λ) of a place and the altitude (α) of the pole are related by

  12. A.

     λ = α

    B.

     λ = 90° - α

    C.

     λ = α - 90°

    D.

     λ = 180° - α


  13. The foot of the perpendicular on the picture plane through the optical centre of the camera lens, is known as

  14. A.

     Isocenter

    B.

     Principal point

    C.

     Perspective centre

    D.

     Plumb line


  15. Pick up the incorrect statement from the following. High oblique photographs

  16. A.

     May have tilt up to 30°

    B.

     May include the image of the horizon

    C.

     May not include the image of the horizon

    D.

     None of these


  17. Parallax bar measures

  18. A.

     Parallax

    B.

     Height

    C.

     Parallax difference

    D.

     Height difference


  19. Homologous points are

  20. A.

     Opposite corners of a photograph

    B.

     Nodal points of the camera lens

    C.

     Corresponding points on the ground and photograph

    D.

     Plumb points of stereo pair of photographs