ক) is always taken on a point of known elevation or can be computed
খ) is added to the known level to obtain the instrument height
গ) taken on an inverted staff is treated as negative
ঘ) all the above.
০১। A bearing of a line is also known as
ক) magnetic bearing
খ) true bearing
গ) azimuth
ঘ) reduced bearing
০২। A clinometer is used for
ক) measuring angle of slope
খ) correcting line of collimation
গ) setting out right angles
ঘ) defining natural features.
০৩। A dumpy level is set up with its eye-piece vertically over a peg A. The height from the top of peg A to the centre of the eye-piece is 1.540 m and the reading on peg B is 0.705 m. The level is then setup over B. The height of the eye-piece above peg B is 1.490 m and a reading on A is 2.195 m. The difference in level between A and B is
ক) 2.900 m
খ) 3.030 m
গ) 0.770 m
ঘ) 0.785 m
ঙ) 1.770 m.
০৪। A dumpy level was set up at mid-point between pegs A and B, 80 m apart and the staff readings were 1.32 and 1.56. When the level was set up at a point 10 m from A on BA produced, the staff readings obtained at A and B were 1.11 and 1.39. The correct staff reading from this set up at S should be
ক) 1.435
খ) 1.345
গ) 1.425
ঘ) none of these.
০৫। A dumpy level was set up at the midpoint between two pegs A and B, 50 m apart and the staff readings at A and B were 1.22 and 1.06. With the level set up a A, the readings at A and B were 1.55 and 1.37. The collimation error per 100 m length of sight is
ক) 0.02 m inclined upwards
খ) 0.04 m inclined downwards
গ) 0.04 m inclined upward
ঘ) none of these.
০৬। A lemniscate curve between the tangents will be transitional throughout if the polar deflection angle of its apex, is
ক)
খ)
গ)
ঘ)
ঙ)
০৭। A lemniscate curve will not be transitional throughout, if its deflection angle, is
ক) 45°
খ) 60°
গ) 90°
ঘ) 120°
ঙ) 180°
০৮। A lens or combination of lenses in which the following defect is completely eliminated is called aplanatic
ক) spherical aberration
খ) chromatic aberration
গ) coma
ঘ) astigmatism.
০৯। A level when set up 25 m from peg A and 50 m from peg B reads 2.847 on a staff held on A and 3.462 on a staff held on B, keeping bubble at its centre while reading. If the reduced levels of A and B are 283.665 m and 284.295 m respectively, the collimation error per 100 m is
ক) 0.015 m
খ) 0.030 m
গ) 0.045 m
ঘ) 0.060 m
১০। A relatively fixed point of known elevation above datum, is called
ক) bench mark
খ) datum point
গ) reduced level
ঘ) reference point.
১১। A sewer is laid from a manhole A to a manhole B, 250 m away along a gradient of 1 in 125. If the reduced level of the invert at A is 205.75 m and the height of the boning rod is 3 m, the reduced level of the sight rail at B, is
ক) 208.75 m
খ) 202.75 m
গ) 206.75 m
ঘ) 211.75 m
১২। A standard steel tape of length 30 m and cross-section 15 x 1.0 mm was standardised at 25°C and at 30 kg pull. While measuring a base line at the same temperature, the pull applied was 40 kg. If the modulus of elasticity of steel tape is 2.2 x 106 kg/cm2, the correction to be applied is
ক) - 0.000909 m
খ) + 0.0909 m
গ) 0.000909 m
ঘ) none of these
১৩। A tape of length l and weight W kg/m is suspended at its ends with a pull of P kg, the sag correction is
ক)
খ)
গ)
ঘ) .
১৪। A theodolite is said to be in perfect adjustment if
ক) rotation axis is vertical to the transit axis
খ) transit axis is perpendicular to line of collimation
গ) line of collimation sweeps out a vertical plane while the telescope is elevated or depressed
ঘ) all the above.
১৫। A transit is oriented by setting its vernier A to read the back azimuth of the preceding line. A back sight on the preceding transit station taken and transit is rotated about its vertical axis. The vernier A reads
ক) azimuth of the forward line
খ) bearing of the. forward line
গ) back bearing of the forward line
ঘ) equal to 360°-azimuth of the forward line.
১৬। A traverse deflection angle is
ক) less than 90°
খ) more than 90° but less than 180°
গ) the difference between the included angle and 180°
ঘ) the difference between 360° and the included angle.
১৭। A uniform slope was measured by the method of stepping. If the difference in level between two points is 1.8 m and the slope distance between them is 15 m, the error is approximately equal to
ক) cumulative, + 0.11 m
খ) compensating, ± 0.11 m
গ) cumulative, - 0.11 m
ঘ) none of these
১৮। A well conditioned triangle has no angle less than
ক) 20°
খ) 30°
গ) 45°
ঘ) 60°.
১৯। ABCD is a rectangular plot of land. If the bearing of the side AB is 75°, the bearing of DC is