Surveying and Levelling

311. The ratio of the angles subtended at the eye, by the virtual image and the object, is known as telescopes

  1. Resolving power
  2. Brightness
  3. Field of view
  4. Magnification

Correct answer: (D)
Magnification

312. The ratio of the distances at which a stated length can be distinguished by the telescope and the human eye, respectively, is called

  1. Brightness of telescope
  2. Magnification of telescope
  3. Resolving power of telescope
  4. None of these

Correct answer: (C)
Resolving power of telescope

313. The ratio of the length of long chord and the tangent length of a circular curve of radius R deflecting through angle Δ, is

  1. sin (Δ/2)
  2. cos (Δ/2)
  3. 2 sin (Δ/2)
  4. 2 cos (Δ/2)

Correct answer: (D)
2 cos (Δ/2)

314. The ratio of the radius and apex distance of a curve deflecting through Δ°, is

  1. sec (Δ/2)- 1
  2. 1 - sec (Δ/2)
  3. cos (Δ/2 - 1
  4. tan (Δ/2) - 1

Correct answer: (A)
sec (Δ/2)- 1

315. The real image of an object formed by the objective must lie

  1. In the plane of cross hairs
  2. At the centre of the telescope
  3. At the optical centre of the eye-piece
  4. Anywhere inside the telescope

Correct answer: (A)
In the plane of cross hairs

316. The reduced bearing of a line is N 87° W. Its whole circle bearing is

  1. 87°
  2. 273°
  3. 93°
  4. 3°

Correct answer: (B)
273°

317. The reduced level of a floor is 99.995 m, the staff reading on the floor is 1.505 m. If the inverted staff reading against the roof is 1.795 m, the floor level below the slab, is

  1. 3.290 m
  2. 3.300 m
  3. 3.275 m
  4. 2.790 m

Correct answer: (B)
3.300 m

318. The representation of general topography of a very flat terrain is possible only

  1. By drawing contours at large interval
  2. By drawing contours at small interval
  3. By giving spot levels at large interval
  4. By giving spot levels to salient features at close interval

Correct answer: (D)
By giving spot levels to salient features at close interval

319. The resection by two point problem as compared to three point problem

  1. Gives more accurate problem
  2. Takes less time
  3. Requires more labour
  4. None of the above

Correct answer: (C)
Requires more labour

320. The rise and fall method of reduction of levels, provides a check on

  1. Back sights
  2. Fore sights
  3. Intermediate sights
  4. All of these

Correct answer: (D)
All of these

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