List of top Geophysics Questions on Surveying and Levelling

Given the following staff readings at two levels, determine the Reduced Level (RL) of B.

Given the bearing N30°W, determine the corresponding Whole Circle Bearing (WCB). \

The bacteria mainly responsible for crown corrosion in a sewer is ___________.

In the context of construction materials, which of the following statements is/are CORRECT?

Pick one or more CORRECT statement(s) from the choices given below, in the context of upstream and downstream cut-offs provided below the concrete apron of weirs/barrages constructed across alluvial rivers.

Free residual chlorine concentration in water was measured to be 2 mg/l (as Cl$_2$). The pH of water is 8.5. By using the chemical equation given below, the HOCl concentration (in $\mu$moles/l) in water is ___________ (round off to one decimal place).
\[ {HOCl} \rightleftharpoons {H}^+ + {OCl}^-, \quad pK = 7.50 \] Atomic weight: Cl = 35.5

A circular tube of thickness 10 mm and diameter 250 mm is welded to a flat plate using 5 mm fillet weld along the circumference. Assume Fe410 steel and shop welding.
As per IS 800:2007, the torque that can be resisted by the weld (in kN.m) is __________ (round off to one decimal place).

The figure shows a propped cantilever with uniform flexural rigidity $ EI $ (in N.m$^2$) and subjected to a moment $ M $ (in N.m). Consider forces and displacements in the upward direction as positive.
Find the upward reaction at the propped support B (in N) when this support settles by $ \Delta $ (in metres).

Match the following in Column I with Column II.

If the Fore Bearing of the lines AB and BC are 60° and 122°, respectively, then the interior angle $ \angle ABC $ (in degrees) is .......... (round off to the nearest integer).

If the horizontal distance between a staff point and the point of observation is $ d $, the error due to the curvature of the earth is proportional to

Organic fraction of municipal solid waste (OFMSW) with bulk density of 315 kg/m$^3$ and water content of 30% is mixed with municipal sludge of bulk density 700 kg/m$^3$ and water content of 70%, such that the water content of the mixture is 40%. The amount (in kg) of sludge to be mixed per kg of OFMSW (rounded off to 2 decimal places) and the density of the mixture (in kg/m$^3$) (rounded off to the nearest integer) are calculated. Which of the following options is/are true:

The maximum value of the function $ h(x) = -x^3 + 2x^2 $ in the interval $[-1, 1.5]$ is equal to ......... (rounded off to 1 decimal place).

In levelling between two points A and B on the opposite banks of a river, the readings are taken by setting the instrument both at A and B, as shown in the table. If the RL of A is 150.000 m, the RL of B (in m) is ....... (rounded off to 3 decimal places).

Free residual chlorine concentration in water was measured to be 2 mg/l (as Cl$_2$). The pH of water is 8.5. By using the chemical equation given below, the HOCl concentration (in $\mu$moles/l) in water is __________ (round off to one decimal place).
\[ {HOCl} \rightleftharpoons {H}^+ + {OCl}^-, \quad pK = 7.50 \] Atomic weight: Cl = 35.5

If the Fore Bearing of the lines AB and BC are 60° and 122°, respectively, then the interior angle $ \angle ABC $ (in degrees) is .......... (round off to the nearest integer).

The maximum value of the function $ h(x) = -x^3 + 2x^2 $ in the interval $[-1, 1.5]$ is equal to ......... (rounded off to 1 decimal place).

In levelling between two points A and B on the opposite banks of a river, the readings are taken by setting the instrument both at A and B, as shown in the table. If the RL of A is 150.000 m, the RL of B (in m) is ....... (rounded off to 3 decimal places).