MCQ Surveying 2

31.The lines of earth's magnetic field run from ?

• south to north 
• north to south 
• east to west 
• west to east.

32.The theodolite is an instrument used for measuring very accurately ?

• horizontal angles only 
• vertical angles only 
• horizontal and vertical angles 
• linear measurements.

33.In the surveying telescopes, cross hairs are fitted in ?

• centre of the telescope 
• optical centre of eye piece 
• front of the eye piece 
• front of the objective.

34.When the image formed by the objective is not situated in the plane of cross-hairs, ?

• the cross-hairs should be adjusted 
• the eye-piece should be focussed 
• the objective should be focussed 
• the parallex should be removed.

35.For removing the parallex, ?

• the eye-piece should be focussed for distinct vision of cross-haris 
• the image of the object should be brought in the plane of cross-hairs 
• either (a) or (b) 
• both (a) and (b).

36.The representative fraction 1/2500 means that the scale is ?

• 1 cm = 0.25 m 
• 1 cm = 2.5 m 
• 1 cm = 25 m 
• 1 cm = 250 m.

37.The ratio of the focal length of the objective to that of an eye-piece of a telescope is called its ?

• definition 
• brightness 
• sensitivity 
• magnification.

38.An angle measured clockwise from the proceeding survey line to the following survey line is called ?

• direct angle 
• vertical angle 
• horizontal angle 
• deflection angle.

39.If a chain is used at a temperature ............. the temperature at which it was calibrated, the error in measured length is negative. ?

• equal to 
• lower than 
• higher than known 

40.The obstacle, which obstructs chaining but not vision, is ?

• river 
• hill 
• rising ground 
• all of these.

41.The degree of the curve is the angle subtended by a chord of ?

• 15 m 
• 20 m 
• 25 m 
• 30 m 

42.The lines passing through points at which the magnetic declination is equal at a given time are called ?

• isogonic lines 
• agonic lines 
• isoclinic lines 
• none of these.

43.The process of turning the telescope of a theodolite over its supporting axis through 180° in a vertical plane, is called ?

• transiting 
• reversing 
• plunging 
• any one of these.

44.The capacity of a telescope of producing a sharp image is called its ?

• definition 
• brightness 
• sensitivity 
• magnification.

45.The power of a telescope to form distinguishable images of objects separated by small angular distance is called its ?

• definition 
• brightness 
• sensitivity 
• resolving power.

46.A deflection angle in a traverse is equal to the ?

• difference between the included angle and 180° 
• difference between 360° and the included angle 
• sum of the included angle and 180° 
• none of the above.

47.In locating the details of inaccessible objects visible atleast from transit stations, the method used is ?

• by angles and distances from the same station 
• by angle from one station and distance from the other station 
• by distances from two different stations 
• none of the above.

48.A staff reading taken on a point whose elevation is to be determined as on a change called ?

• fore sight reading 
• back sight reading 
• intermediate sight 
• none of these.

49.The plane table surveying is ?

• most suitable for preparing small-scale maps 
• particularly advantageous in magnetic areas 
• less costly than a theodolite survey 
• all of the above.

50.Which of the following statement is correct ?

• The error in measured length due to bad ranging is compensating error. 
• If the chain used in measuring a distance is too short, the error is positive error. 
• The error in measured length due to careless holding of chain is cumulative error. 
• When the pull applied while measuring with a tape, is more than the standard tape, the error in measured length is positive.