Engineering Survey

161) Correction for slope is

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h²/2L

162) Indirect ranging is adopted when the two ends of chain line are

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mutually invisible

163) A chain is made up of mild steel or galvanised iron wire of diameter

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5 mm

164) A freely floating needle slightly gets inclined to the horizontal anywhere except on the equator. It is called

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dip

165) The variation of magnetic declination within a day is called

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diurnal variation

166) Isogonic lines are the lines having the same

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declination

167) A levelling station is a place where

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the level staff is held

168) Pick up the odd statement

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focus the objective towards a white or bright background for the clear visibility of cross hairs

169) The telescope of a Dumpy level

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is rigidly fixed to the levelling head

170) An example for instrumental error in levelling is

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collimation error

Subject Notes

Objective Box

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