Which of the following errors cannot be eliminated by taking both face observations ?
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Which of the following errors can be eliminated by taking mean of bot face observations ?
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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
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Perspective centre relates to
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Circumpolar stars
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The rise and fall method of levelling provides a complete check on
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Invar tapes used for measuring base lines, is made of nickel-iron alloy containing nickel
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In direct method of contouring, the process of locating or identifying points lying on a contour is called
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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
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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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Height of instrument method of levelling is
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The slotted template method
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When a star is between the pole and the horizon, the relationship between latitude (λ), zenith distance (z) and declination δ, is
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The length of a parallel of λ latitude between two meridians is equal to difference in longitudes multiplied by
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The hour angle of the heavenly body for Greenwich meridian equals the hour angle of the body for any other meridian + longitude:
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Which of the following is not used in measuring perpendicular offsets ?
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The nearest star is so far away from the earth that the directions to it from two diametrically opposite points on the earth differs less than
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Right ascension of a heavenly body is its equatorial angular distance measured
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and are the angles subtended by a point of elevation h at their air station with respective plumb points. Photo scale and focal length of the lens being ‘S’ and ‘f’ respectively. Parallax displacement of the point due to relief, is
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Q100
Open questionThe method of surveying by triangulation was first introduced by the Dutchman Snell in
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