Pick up the correct statement from the following : in astronomical telescope, th

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Question
Pick up the correct statement from the following :
Options
A. in astronomical telescope, the rays from the object after refraction at the objective are brought to a focus before entering the eyepiece to produce a real inverted image in front of the eye piece
B. in Galileo's telescope, the rays from the object get refracted at the objective and are intercepted by the eyepiece before a real image is formed
C. a line passing through the optical centre of the objective traversing through the eyepiece, is called line of sight
D. the line of sight which passes through the intersection of cross-lines marked on a diaphragm fixed in front of the eyepiece in a plane at right-angles to the axis, is called the line of collimation
E. all the above.

Correct Answer

all the above.

Surveying problems

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1. Deviation of the actual road gradient from the proposed contou'r gradient up hill side, involves
Options
A. embankment on the centre line
B. excavation on the centre line
C. earth work on the centre line
D. none of these.

2. 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
Options
A. 0.02 m inclined upwards
B. 0.04 m inclined downwards
C. 0.04 m inclined upward
D. none of these.

3. The conventional sign shown in below figure represents a
Options
A. bridge carrying railway below road
B. bridge carrying road below railway
C. bridge carrying road and railway at the same level
D. a level crossing.

4. In levelling operation
Options
A. if second reading is more than first, it represents a rise
B. if first reading is more than second, it represents a rise
C. if first reading is less than second, it represents a fall
D. if second reading is less than first, it represents a fall
E. both (b) and (c).

5. Geodetic surveying is undertaken
Options
A. for production of accurate maps of wide areas
B. for developing the science of geodesy
C. making use of most accurate instruments and methods of observation
D. for determination of accurate positions on the earth's surface of system of control points
E. all the above.

9. The branch of surveying in which both horizontal and vertical positions of a point, are determined by making instrumental observations, is known
Options
A. tacheometry
B. tachemetry
C. telemetry
D. all the above.

10. The latitude of a traverse leg is obtained by multiplying its length by
Options
A. tangent of its reduced bearing
B. sign of its reduced bearing
C. cosine of its reduced bearing
D. cosecant of its reduced bearing.

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