is greater than R. L. of first point is same as R.L. of first point is smaller than R.L. of first point cannot be determined from the given data

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increase decrease not change either 'a' or 'b'

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error due to horizontal axis not being perpendicular to the vertical axis index error i.e. error due to imperfect adjustrnent of the vertical circle vernier error due to non-parallelism of the- axis of telescope level and line of collimation none of the above

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In tertiary triangulation, the length of the sides is in the range of 10 to 25 The length of the base line in primary triangulation is 8 to 12 km. Both a & b The triangulation station at which astronomical observations are made for azimuths are called Laplace stations.

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the middle station is the nearest the middle station is close to the great circle either of the extreme stations is the nearest the middle station is farther than the other two stations

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1: 25,000 1: 50,000 1: 2,50,000 1: 5,00,000

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90° 120° 210° 270°

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Axis of the plate level is perpendicular to the vertical axis. The line of collimation is at right angles to the vertical axis. The axis of the altitude level is parallel to the line of collimation when it is horizontal and the vertical circle reads zero. All of the above

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A curved surface every element of which is perpendicular to the spheroidal shape of the earth. A horizontal surface every element of which is normal to plumb line. A curved surface which is perpendicular to the direction of gravity at every point. A plane surface which is perpendicular at all points to the direction of gravity.

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± 0.45 m ± 0.06 m ± 0.54 m ± 0.36 m

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