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Civil Engineering Objective Questions { Surveying }



288.  Pick up the correct statement from the following :
A. in astronomical telescope, the rays from the object after refraction at the objective are brought o a focus before
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 .entering the eyepiece to produce a real inverted image in front of the eye piece
D. all the above.
Discussion
289.  Pick up the correct statement from the following :
A. the diaphragm is placed between eyepiece and the objective but nearer to the former
B. the diaphragm is placed between the eyepiece and objective but nearer to the later
C. the outer component of the objective is a double-convex lens of crown glass
D. all the above.
Discussion
290.  In an internal focusing telescope
A. the objective is at a fixed distance from the diaphragm
B. the focusing is done by the sliding of a divergent lens.
C. the focusing divergent lens is situated at about the middle of the tube
D. all the above,
Discussion
291.  The minimum range for sliding the focusing lens in the internal focusing telescope for focusing at all distances beyond 4 m is
A. 5 mm
B. 10 mm
C. 15 mm
D. 20 mm.
Discussion
292.  Pick up the correct specification of Ramsden eyepiece from the following :
A. it consists of two equal piano convex lenses
B. the curved surfaces of piano-convex lenses face each other
C. the two lenses are separated by a distance equal to 2/3 of the focal length of either lens.
D. all the above.
Discussion
293.  Pick up the correct statement from the following :
A. if the image of the object does not fall on the plane of the cross-lines, parallax exists
B. parallax has nothing to do with the eyepiece
C. the eyepiece is adjusted for clear vision of the cross hairs
D. all the above.
Discussion
294.  The 10 mm markings on a levelling staff placed at 20 m are separated by ?
A. 1000 radian
B. 1500 radian
C. 2000 radian
D. 2500 radian
Discussion

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