The construction of optical square is based, on the principle of optical reflect

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Question
The construction of optical square is based, on the principle of optical
Options
A. reflection
B. refraction
C. double refraction
D. double reflection.

Correct Answer

double reflection.

Surveying problems

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2. The tangent to the liquid surface in a level tube, is parallel to the axis of the level tube at
Options
A. every point of the bubble
B. either end of the bubble
C. the mid-point of the bubble
D. no where.

3. In case of reduction of levels by the height of instrument method,
Options
A. ? B.S. - ? F.S. = difference in R.L.S of the first station and last station
B. ? (R.L. + I + F.S.) - first R.L = ? (H.I. + No. of R.L.s.)
C. both (a) and (b) above
D. neither (a) nor (b).

4. A traverse deflection angle is
Options
A. less than 90�
B. more than 90� but less than 180�
C. the difference between the included angle and 180�
D. the difference between 360� and the included angle.

5. The Random errors tend to accumulate proportionally to
Options
A. numbers of operations involved
B. reciprocal of operations involved
C. square root of the number of operation involved
D. cube root of the number of operation involved.

6. Pick up the correct statement from the following :
Options
A. if the image of the object does not fall on the plane of the cross-lines, parallax exists
B. parallax has nothing to do with the eyepiece
C. the eyepiece is adjusted for clear vision of the cross hairs
D. all the above.

7. If ? is the angle between the polar ray and the tangent at the point of commencement of a lemniscate curve, the equation of the curve, is
Options
A. l = ksin ?
B. l = ksin 2?
C. l = ksin 3?
D. l = ktan 2?
E. l = kcos 2?

8. The formula for the horizontal distances for inclined sights, on staff held normalis
s cos ? + (f + d) cos ? � h sin ?
Options
A. minus sign is used for angle of depression
B. plus sign is used for angle of depression
C. minus sign is used for angle of elevation
D. non of these.

9. Grid lines are parallel to
Options
A. magnetic meridian of the central point of the grid
B. line representing the central true meridian of the grid
C. geographical equator
D. none of these.

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