This set of Surveying Multiple Choice Questions & Answers (MCQs) focuses on “Levelling – Stadia Method”.

1. Stadia method is based on the principle that ratio of perpendicular to the base is constant.
a) True
b) False

Explanation: In isosceles triangle ratio to the perpendicular to the base is constant. Thus, this method principle is used in stadia method.

2. In stadia method, diaphragm in tachometer is provided with there stadia hairs and stadia hair reading is taken by looking through a diaphragm.
a) True
b) False

Explanation: In stadia method, diaphragm in tachometer is provided with there stadia hairs and stadia hair reading is taken by looking through a telescope.

5. In the below figure, f1/f2 = _______

a) i/s
b) s/i
c) D/d
d) d/D

Explanation: From figure, aOA and bOB passing through optical center. So, ∆ aOb and ∆ AOB are similar triangles, then f1/f2= s/i.

6. From the following figure, D is?

a) kS+c
b) S + kc
c) k(S+c)
d) k S – c

Explanation: Horizontal distance between the axis and staff is D = f1 + d = f*s/i + (f+d) = k.s+c, Where, D=k. s+c is distance equation, c is additive constant of instrument, k is multiplying constant or stadia interval factor.
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7. In the following figure, D = k S + c, where k is additive constant.

a) True
b) False

Explanation: Horizontal distance between the axis and staff is D = f1 + d = f*s/i + (f+d) = k.s + c, Where, D=k. s+c is distance equation, c is additive constant of instrument, k is multiplying constant or stadia interval factor.

8. In the following figure, D = k S + c, where c is additive constant.

a) True
b) False

Explanation: Horizontal distance between the axis and staff is D = f1 + d = f*s/i + (f+d) = k.s + c, Where, D=k. s+c is distance equation, c is additive constant of instrument, k is multiplying constant or stadia interval factor.

9. In the following figure, D = ______

a) ks cosθ2 + ccosθ
b) ks cos2θ + ccosθ
c) ks cos2θ + ccos2θ
d) ks cos2θ + ccos2θ

Explanation: Considering Angle of Elevation (positive), Here, A’C’ = Scosθ, T1B = L = KA’C’ + C
= kscosθ +c, D = Lcosθ = (kscosθ+C)cosθ, D = kscosθ2 + ccosθ.

10. In the following figure, D = __________

a) D = 2S/(tanθ1 – tanθ2)
b) D = 3S/(tanθ1 – tanθ2)
c) D = S/2(tanθ1 – tanθ2)
d) D = S/(tanθ1 – tanθ2)

Explanation: Here, V+S = Dtanθ1, V = Dtanθ2, S = D(tanθ1 – tanθ2). Therefore, D = S/(tanθ1 – tanθ2).

Sanfoundry Global Education & Learning Series – Surveying.

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