Flint glass has slightly the greater refracting power than crown glass has rough

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Question
Flint glass
Options
A. has slightly the greater refracting power than crown glass
B. has roughly double refracting power than that of crown
C. and crown glass proportions yield the required focal length and neutralise the dispersion produced by the convex lens at the emergence from the concave
D. all the above.

Correct Answer

all the above.

Surveying problems

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1. Accuracy of elevation of various points obtained from contour map is limited to
Options
A. of the contour interval
B. th of the contour interval
C. rd of the contour interval
D. th of the contour interval.

2. The method of finding out the difference in elevation between two points for eliminating the effect of curvature and refraction, is
Options
A. reciprocal levelling
B. precise levelling
C. differential levelling
D. flying levelling

5. 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.

7. Angles to a given pivot station observed from a number of traverse stations when plotted, the lines to the pivot station intersect at a common point
Options
A. angular measurements are correct and not the linear measurements
B. linear measurements are correct and not the angular measurements
C. angular and linear measurements are correct and not the plotting of traverse
D. angular and linear measurements and also plotting of the traverse are correct.

8. For preparation of a contour plan for a route survey
Options
A. method of squares is used
B. method of trace contour is used
C. method of cross profile is used
D. indirect method of contouring is used.

9. Reduced bearing of a line is an angle between
Options
A. north line and given line measured clockwise
B. north line and given line measured anticlockwise
C. east or west and the given line
D. given line and the part of the meridian whether N end or S end, lying adjacent to it.

10. Magnetic bearing of a survey line at any place
Options
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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