1. Which of the following is not a method of levelling?
a) Barometric levelling
b) Trigonometric levelling
c) Spirit levelling
d) Traverse levelling
Explanation: Three principal methods are used for determining a difference in elevation, namely, barometric levelling, trigonometric levelling and spirit levelling. Traversing is that type of surveying in which a number of connected survey lines form the framework.
2. Which of the following methods of levelling makes use of the phenomenon that difference in elevation between two points is proportional to the difference in atmospheric pressures at these points?
a) Barometric levelling
b) Trigonometric levelling
c) Spirit levelling
d) Traverse levelling
Explanation: A barometric levelling makes use of the phenomenon that difference in elevation between two points is proportional to the difference in atmospheric pressures at these points. A barometer, therefore, may be used and the readings observed at different points would yield a measure of the relative elevations of those points.
3. At a given point, the atmospheric pressure doesn’t remain constant in the course of the day, even in the course of an hour.
a) True
b) False
Explanation: At a given point, the atmospheric pressure doesn’t remain constant in the course of the day, even in the course of an hour. Therefore, barometric levelling relatively inaccurate.
4. Which process of levelling in which the elevations of points are computed from the vertical angles and horizontal distances measured in the field?
a) Barometric levelling
b) Trigonometric levelling
c) Spirit levelling
d) Traverse levelling
Explanation: Trigonometric levelling is also called indirect levelling. It is the process of levelling in which the elevations of points are computed from the vertical angles and horizontal distances measured in the field.
5. Which of the following methods of levelling is a modified form of stadia levelling?
a) Barometric levelling
b) Trigonometric levelling
c) Spirit levelling
d) Traversing
Explanation: Trigonometric levelling is the process of levelling in which any triangle can be computed from proper trigonometric relations. In a modified form called stadia levelling.
6. Surveyor’s telescope is an adaptation of Kepler’s telescope.
a) True
b) False
Explanation: The surveyors telescope is an adaptation of Kepler’s telescope. It employs two convex lenses. The one nearest to the object is called the objective and the other near the eye is called eyepiece.
7. The optical principles of the surveying telescope are based on the fact that all parallel rays of light reaching a convex lens are bent when they leave it in such a manner that they intersect at a common point, called the focus.
a) True
b) False
Explanation: The optical principles of the surveying telescope are based on the fact that all parallel rays of light reaching a convex lens are bent when they leave it in such a manner that they intersect at a common point, called the focus and that all the rays passing through another point called the optical centre pass through the geometric centre of lens without bending.
8. In surveyor’s telescope, the convex lens nearest to the object is called ______________
a) Eye piece
b) Objective
c) Diaphragm
d) Surveyor lens
Explanation: The surveyor’s telescope is an adaptation of Kepler’s telescope. It employs two convex lenses. The one nearest to the object is called the objective and the other near the eye is called eyepiece.
9. In surveyor’s telescope, the convex lens nearest to the eye is called ____________
a) Eye piece
b) Objective
c) Diaphragm
d) Surveyor lens
Explanation: The surveyor’s telescope is an adaptation of Kepler’s telescope. It employs two convex lenses. The one nearest to the object is called the objective and the other near the eye is called eyepiece.
10. The object glass provides a virtual inverted image in front of the eyepiece which in turn magnifies the image to produce a real erect image in surveyors telescope.
a) True
b) False
Explanation: The object glass provides a real inverted image in front of the eyepiece which, in turn, magnifies the image to produce an inverted virtual image.