Surveying (Part-3) (General Engineering) (SSC JE)

Total Questions: 50

31. A scale is to be divided to read into Metre, Decimeter and centimeter. Which type of the following scales is suited best for this purpose? [RRB S.S.E. 02.09.2015 (Shift-III) ]

Correct Answer: (d) Diagonal Scale and Vernier Scale
Solution:

The scale in which three successive dimension can be measured at a time is called a diagonal scale.
The diagonal scale works on the principle of a similar triangle. This scale can read up to three dimensions. i.e. 10m, 1 m, 0.10 m.

32. Which of the following is not a permanent adjustment in theodolite : [RRB S.S.E. 02.09.2015 (Shift-III) ]

Correct Answer: (d) Elimination of parallax
Solution:

Elimination of parallax is not a permanent adjustment.
Permanent adjustment of theodolite:-
• Adjustment of plate level:- To make the axis of plate bubble perpendicular to the vertical axis when the bubble is central.
• Adjustment, line of sight:- The line of sight should coincide with optical axis of the telescope.
• Adjustment of horizontal axis:- Horizontal axis should be perpendicular to the vertical axis spire test is done.

33. The reference points on which a day's work is closed and from where levelling is continued the next day are called as : [RRB S.S.E. 02.09.2015 (Shift-III) ]

Correct Answer: (a) Temporary benchmarks
Solution:

The reference points on which a day's work is closed from where levelling is continued the next day are called temporary Bench Mark.

34. A one metre distance is to be measured in decimeter, centimeter and millimeter units. Which type of scale do you suggest? [RRB JE 29.08.2015 (Shift-I) ]

Correct Answer: (c) diagonal scale
Solution:

Diagonal scale – On a diagonal scale, it is possible to measure three dimensions such as meters, decimeters and centimeters, units, tenths and hundreds, yards, feet and inches etc. A short length is divided into a number of parts by using the principle of similar triangles in which like sides are proportional.

35. Which of the following tape is least affected by temperature changes and is highly precise– [RRB JE 29.08.2015 (Shift-I) ]

Correct Answer: (d) Invar tape
Solution:

Invar tape– These types of tapes are used for the highest precession work (es) for the measurement on basic lines.
• Invar is on alloy containing 36% Nickel and 64% steel.
• Invar is most accurate because of low thermal of material used in tape.

36. Very small parts of a wrist watch are to be represented on drawings. Which type of scale do you suggest? [RRB JE 29.08.2015 (Shift-II) ]

Correct Answer: (c) enlarging scales
Solution:

Enlarging scale means that the drawing is drawn with the bigger dimensions in comparison to actual dimensions of the object.

A representative fraction of 1 : 02 means 5 : 1, i.e. the drawing is five times bigger than the actual object; hence the scale is enlarging scale.

37. What is the magnetic declination at a place if the magnetic bearing of the sun at noon is 184⁰ ? [RRB JE 29.08.2015 (Shift-II) ]

Correct Answer: (a) 40⁰ W
Solution:

38. The point at which both foresight and back sight are taken during the course of levelling is called as : [RRB S.S.E. 03.09.2015 (Shift-I) ]

Correct Answer: (d) Change point
Solution:

In leveling, a point at which two readings are taken on the staff. One before moving the instrument to new position, and one after setting the instrument at the new position.

39. Which of the following is not true for the direct and indirect methods of contouring? [RRB S.S.E. 03.09.2015 (Shift-I) ]

Correct Answer: (d) Indirect method is relatively more expensive
Solution:

Indirect methods (For undulated ground, hilly areas)– Usually the indirect methods of contouring are preferred as they are less tedious and less time consuming.

• Indirect method is relatively not more expensive.
Direct methods– It is very accurate method but is very tedious and time consuming.

40. In surveying, the triangles having angles smaller than 30 degree are called as [RRB S.S.E. 03.09.2015 (Shift-III) ]

Correct Answer: (c) Ill-conditioned triangles
Solution:

A triangle in which an angle of the triangle is less than 30º or greater than 120º is known as ill conditioned triangle.