Engineering :: Surveying

@ : Home > Civil Engineering > Surveying

121.

When the cross-hairs are not clearly visible,

A.	the cross-hairs should be adjusted	B.	the eye-piece should be focussed
C.	the objective should be focussed	D.	the parallex should be removed

122.

For removing the parallex,

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

123.

The capacity of telescope of producing a sharp image is called its

A.	definition	B.	brightness
C.	sensitivity	D.	magnification

124.

The brightness of the image

A.	is directly proportional to	B.	is inversely proportional to
C.	varies directly as the square of	D.	varies inversely as the square of

125.

The image produced by the telescope will be dull, if it has

dull

bright

126.

If the definition of a telescope is poor, it will produce a clear and district image.

True

False

127.

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

A.	definition	B.	brightness
C.	sensitivity	D.	magnification

128.

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

A.	definition	B.	brightness
C.	sensitivity	D.	resolving power

129.

The magnification of a telescope is the ratio of the angle subtended at the eye by the virtual image of the object to that subtended by the object.

Correct

Incorrect

130.

The angle of field of the telescope

A.	is independent of the size of the object galss	B.	increases as the size of the eye piece increases
C.	decreases as the distance between eye piece and object increases	D.	all of the above