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Civil Engineering Objective Questions { Advanced Surveying }

92. Rotation of the camera at exposure about horizontal axis normal to the line of flight, is known as
A. swing
B. tilt
C. tip
D. none of these.

93. Rotation of the camera at exposure about the line of flight, is known as
A. tilt
B. tip
C. swing
D. none of these.

94. The rate of change of parallax dp I dh with respect to change in h, may be expressed as
A. fBI(H - h)
B. fB1(11 - h)2
C. fBI(H + h)
D. fBl(H + h)2.

95. Pick up the correct statement from the following :
A. The measured stereoscopic base of photographs is obtained by dividing the air base in metres by the mean scale of the photograph
B. The difference between the absolute parallax of two points depends upon the difference in their elevations
C. The line joining the principal point of a photograph and the transferred principal point of the adjoining photograph, is called stereoscopic base
D. all the above.

96. The difference of parallax for a given difference in elevation is independent of
A. focal length of the camera
B. overall size of the photo graphs
C. percentage of overlap
D. all the above.

97. The parallax equation Ap - H - h is applicable to entire overlap of the photographs only if parallax is measured
A. normal to base line
B. parallel to base line
C. both (a) and (b)
D. neither (a) nor (b).

98. Assuming human normal vision distance 25 cm, smallest measurable angle 20", and introcular distance 6.5 cm, the smallest depth to be discerned is
A. 0.1 mm
B. 0.5 mm
C. 1.00 mm
D. 1.1 mm.

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