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Civil Engineering :: Surveying

  1. A lens or combination of lenses in which the following defect is completely eliminated is called aplanatic

  2. A.

    spherical aberrationon

    B.

    chromatic aberration

    C.

    coma

    D.

    astigmatism.


  3. While setting a plane table at a station it was found that the error in centering was 30 cm away from the ray of length 40 m drawn from the station. If the scale of the plan is 1 cm = 2 cm, the displacement of the end of the ray in plan from the true position will be

  4. A.

    0.02 cm

    B.

    0.15 cm

    C.
    02 cm
    D.

    0.1 cm


  5. 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)

  6. A.

    50" 

    B.

    30"\(\sqrt{n}\)

    C.
    60"\(\sqrt{n}\)

  7. Straight, parallel and widely spaced contours represent

  8. A.
    a steep surface
    B.

    a flat surface

    C.

    an inclined plane surface

    D.

    curved surface.


  9. The theodolites used for making tacheometric observations by optical wedge system, are

  10. A.

    provided with stadia hairs in front of eye piece

    B.

    not provided with stadia hairs at all

    C.

    fitted with a glass wedge inside the telescope

    D.

    fitted with a glass wedge in front of telescope.


  11. Resolving power of a telescope depends on

  12. A.

    the diameter of the aperture

    B.

    the pupil aperture of the eye

    C.

    the diameter of the object glass

    D.

    all the above.


  13. If 50 m point of a 100 m tape is 50 cm off line, and 50 m sections are straight, an error is generated equal to

  14. A.

    \(\frac { 1 } { 10,000 } \)

    B.

    \(\frac { 1 } { 15,000 } \)

    C.

    \(\frac { 1 } { 20,000 } \)

    D.

    \(\frac { 1 } { 25,000 } \)


  15.  

    Pick up the correct statement from the following :

  16. A.

    with both handles in his left hand, the chain man throws out the chain with his right hand and the second chain man assists him to free it from knots

    B.

    the follower of the chaining operation should be more experienced than the leader

    C.

    at the end of the tenth chain length, the two chain men meet and the ten arrows are handed over to the leader

    D.

    all the above.


  17.  

    If Δ is the angle of deflection of a simple curve of radius R, the distance between the mid-point of the curve and long chord, is

  18. A.

    R [ 1- sin \(\frac { Δ} { 2 } \) ]

    B.

    R [ 1+ sin \(\frac { Δ} { 2 } \) ]

    C.

    R [ 1 + cos \(\frac { Δ} { 2 } \) ]

    D.

     R [ 1- cos \(\frac { Δ} { 2 } \)]


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

  20. A.

    \(\frac { 1 } { 1000 }\)  radian 

    B.

    \(\frac { 1 } { 1500 }\) radian 

    C.

    \(\frac { 1 } { 2000 }\)  radian 

    D.

    \(\frac { 1 } { 2500 }\) radian