The horizon glass in an optical square is – McqOptions

MCQOPTIONS

1.	The horizon glass in an optical square is
A.	wholly silvered
B.	wholly unsilvered
C.	one-fourth silvered and three-fourth unsilvered
D.	half silvered and half unsilvered
Answer» E.

Discussion

No Comment Found

Related MCQs

The difference between the sum of the angles of a apherical triangle on the earth's surface and the angles of the corresponding plane triangle for every 195.5 km2 of area is only
A French cross-staff has a magnetic compass at the top.
When a staff is sighted through the telescope, a certain length of staff is intercepted by the stadia lines. The staff intercept varies with the distance at which the staff is held.
It is required to find the difference in elevation between two points A and B. During levelling, it is found that the staff reading at B is more than the staff reading at A. It indicates that the point A is
The adjustable cross-staff is used for setting out an offset
When the effect of refraction is taken into account in levelling, the true staff reading is obtained by subtracting the correction for refraction from the observed staff reading.
The correction to be applied to each 30 m chain for a line measured along a slope of ? is
An open cross-staff is commonly used for setting out
The method of reiteration of measuring horizontal angles is generally preferred when several angles are to be measured at a particular station.
In levelling, the correction for combined curvature and refraction (in metres) is equal to