81. Which of the following errors cannot be eliminated by taking both face observations ?
82. Which of the following errors can be eliminated by taking mean of bot face observations ?
83. The scale of a vertical photograph of focal length ‘f’ taken from height of ‘H’ metres above M.S.L., at a point of reduced level ‘h’, is
84. Perspective centre relates to
85. Circumpolar stars
86. The rise and fall method of levelling provides a complete check on
87. Invar tapes used for measuring base lines, is made of nickel-iron alloy containing nickel
88. In direct method of contouring, the process of locating or identifying points lying on a contour is called
89. If altitude bubble is provided both on index frame as well as on telescope of a theodolite, then the instrument is levelled with reference to
i) altitude bubble on index frame
ii) altitude bubble on index frame if it is to be used as a level
iii) altitude bubble on telescope
iv) altitude bubble on telescope if it is to be used as a level
The correct answer is
i) altitude bubble on index frame
ii) altitude bubble on index frame if it is to be used as a level
iii) altitude bubble on telescope
iv) altitude bubble on telescope if it is to be used as a level
The correct answer is
90. In the cross-section method of indirect contouring, the spacing of cross-sections depends upon
i) contour interval
ii) scale of plan
iii) characteristics of ground
The correct answer is
i) contour interval
ii) scale of plan
iii) characteristics of ground
The correct answer is
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