While viewing through a level telescope and moving the eye slightly, a relative movement occurs between the image of the levelling staff and the cross hairs. The instrument is
Options
A. correctly focussed
B. not correctly focussed
C. said to have parallax
D. free from parallax.
Correct Answer
said to have parallax
More questions
1. A soil not fully consolidated under the existing over-burden pressure, is called
4. Offsets are measured with an accuracy of 1 in 40. If the point on the paper from both sources of error (due to angular and measurement errors) is not to exceed 0.05 cm on a scale of 1 cm = 20 m, the maximum length of offset should be limited to
Correct Answer: a confined bed of impervious material between acquifers
6. A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The mechanical advantage of the lifting machine is