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Civil Engineering :: Surveying

  1. An imaginary line lying throughout on the surface of the earth and preserving a constant inclination to the horizontal, is called

  2. A.
    contour line
    B.

    contour gradient

    C.
    level line
    D.
    line of gentle scope.

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  3.  

    An angles of 45° with a chain line may be set out with

  4. A.

    optical square

    B.

    open cross staff

    C.
    Fench cross staff
    D.
    prismatic square.

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  5. Pick up the correct statement from the following :

  6. A.

    spherical aberration may be reduced by diminishing the aperture

    B.

    spherical aberration may be minimised by replacing the single lens by a combination of the lenses.

    C.

    in telescope objectives, a combination of convex lens and concave lens is used.

    D.

    in eyepieces, two plano-convex lenses placed at a certain distance apart are used

    E.

    all the above.

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  7. The imaginary line passing through the intersection of cross hairs and the optical centre of the objective, is known as

  8. A.

    line of sight

    B.

    line of collimation

    C.

    axis of the telescope

    D.

    none of these.

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  9. 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

  10. A.

    1.435

    B.

    1.345

    C.

    1.425

    D.

    none of these.

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  11. The bearing of C from A is N 30° E and from B, 50 metres east of A, is N 60° W. The departure of C from A is

  12. A.

    50 m

    B.

     50 \(\sqrt3{}\) m

    C.

    25 \(\sqrt3{}\) m

    D.
    25 m

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  13.  

    Pick up the correct statement from the following :

  14. A.

    it is difficult to eliminate an error completely at first trial

    B.

    instability of the instrument makes it almost impossible to adjust it satisfactorily

    C.

    adjustment screws must be left bearing firmly but should never be forced

    D.

    all the above.

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  15. The rise and fall method of reduction of levels, provides a check on

  16. A.

    back sights

    B.

    fore sights

    C.

    intermediate sights

    D.

    all of these.

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  17. In tangential tacheometry, an ordinary level staff is used

  18. A.
    leaning towards the instrument for inclined sights upward
    B.

    leaning away from the instrument for inclined sights downwards

    C.
    vertical in all cases
    D.

    none of these.

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  19. The instrument which is used in plane tabling for obtaining horizontal and vertical distances directly without resorting to chaining, is known as

  20. A.

    Plane alidade

    B.

    telescopic alidade

    C.

    clinometer

    D.
    tacheometer.

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