Legal Metrology • Civil Engineering Paper-II
The reading of differential manometer of a venturi meter, placed at 45° to the horizontal is 11 cm. If the venturi meter is turned to horizontal position, the manometer reading will be
A)
Zero cm
B)
an
C)
1 cm
D)
11√2 cm
Based on established principles in Mechanical Engineering, the correct and most clinically/technically appropriate choice is 'Zero cm' (Option A).
Legal Metrology • Civil Engineering Paper-II
Water distribution systems are sized to meet the
A)
Maximum hourly demand
B)
Average hourly demand
C)
Maximum daily demand and fire demand
D)
Average daily demand and fire demand
In the context of Civil Engineering, the most appropriate and technically accurate answer is 'Maximum hourly demand' (Option A).
Legal Metrology • Civil Engineering Paper-II
The number of revolutions of a current meter in 50 seconds were found to be 12 and 30 corresponding to the velocities of 0.25 and 0.46 m/s respectively. What velocity (in m/s) would be indicated by 50 revolutions of that current meter in one minute?
A)
0.42
B)
0.50
C)
0.60
D)
0.73
In the context of Civil Engineering, the most appropriate and technically accurate answer is '0.50' (Option B).
Legal Metrology • Civil Engineering Paper-II
A lake has a maximum depth of 60 m. If the mean atmospheric pressure in the lake region is 91 kPa and the unit weight of the lake water is 9790 N/m³, the absolute pressure (in kPa, round off to two decimal places) at the maximum depth of the lake is
A)
690.4
B)
658.4
C)
678.4
D)
688.4
Absolute pressure = atmospheric pressure + γh = 91 + (9790×60)/1000 = 678.4 kPa.
Legal Metrology • Civil Engineering Paper-II
The necessary and sufficient condition for a surface to be called as a ‘free surface’ is
A)
no stress should be acting on it
B)
tensile stress acting on it must be zero
C)
shear stress acting on it must be zero
D)
no point on it should be under any stress
In the context of Mechanical Engineering, the most appropriate and technically accurate answer is 'no stress should be acting on it' (Option A).
Legal Metrology • Civil Engineering Paper-II
A catchment may be idealised as a rectangle. There are three rain gauges located inside the catchment at arbitrary locations. The average precipitation over the catchment is estimated by two methods: (i) Arithmetic mean (P₁), and (ii) Thiessen polygon (P₂). Which one of the following statements is correct?
A)
P₁ is always smaller than P₂
B)
P₁ is always equal to P₂
C)
There are no definite relationships between P₁ and P₂
D)
P₁ is always greater than P₂
In the context of Civil Engineering, the most appropriate and technically accurate answer is 'P₁ is always greater than P₂' (Option D).
Legal Metrology • Civil Engineering Paper-II
In a catchment, there are four rain-gauge stations, P, Q, R and S. Normal annual precipitation values at these stations are 780 mm, 850 mm, 920 mm and 980 mm, respectively. In the year 2013, stations Q, R and S were operative but P was not. Using the normal ratio method, the precipitation at station P for the year 2013 has been estimated as 860 mm. If the observed precipitation at stations Q and R for the year 2013 were 930 mm and 1010 mm, respectively; what was the observed precipitation (in mm) at station S for that year?
A)
1023.43 mm
B)
1093.43 mm
C)
1043.43 mm
D)
1103.43 mm
In the context of Civil Engineering, the most appropriate and technically accurate answer is '1093.43 mm' (Option B).
Legal Metrology • Civil Engineering Paper-II
A vertical triangular plane area, submerged in water, with one side in the free surface, vertex downward and latitude ‘h’ has the pressure centre below the free surface by
A)
h/4
B)
h/3
C)
2h/3
D)
h/2
For a triangular vertical area with its base at the surface, the centre of pressure lies at 2h/3 below the surface.
Legal Metrology • Civil Engineering Paper-II
A two-hour duration storm event with uniform excess rainfall of 3 cm occurred on a watershed. Considering a constant base flow of 10 m³/s, the peak flow ordinate (in m³/s) of one-hour unit hydrograph for the watershed is
A)
12.66 m³/s
B)
11.66 m³/s
C)
9.66 m/s
D)
10.66 m³/s
In the context of Civil Engineering, the most appropriate and technically accurate answer is '12.66 m³/s' (Option A).
Legal Metrology • Civil Engineering Paper-II
The following characteristics pertain to the sand filters used in water industry: I. Filtration rate is 1 to 4 m³/m²/day, II. Typical duration of operation in one run is 24 to 72 hours, III. Operating cost is low. Which of the above characteristics pertain to slow sand filters?
A)
I, II and III
B)
I and II
C)
II and III
D)
I and III
In the context of Civil Engineering, the most appropriate and technically accurate answer is 'II and III' (Option C).
Legal Metrology • Civil Engineering Paper-II
The stage-discharge relation in a river during the passage of flood is measured. If q₁ is the discharge at the stage when water surface is falling and q₂ is the discharge at the same stage when water surface is rising, then
A)
q₁ = q₂
B)
q₁ < q₂
C)
q₁ > q₂
D)
q₁ = q₂ constant for all stages
In the context of Civil Engineering, the most appropriate and technically accurate answer is 'q₁ = q₂ constant for all stages' (Option D).
Legal Metrology • Civil Engineering Paper-II
In deriving the equation for the hydraulic jump in the rectangular channel in terms of the conjugate depths and the initial Froude number,
A)
continuity equation and energy equation are used
B)
continuity equation and momentum equation are used
C)
equations of continuity, momentum and energy are used
D)
gradually varied flow equation is used
Based on established principles in Mechanical Engineering, the correct and most clinically/technically appropriate choice is 'equations of continuity, momentum and energy are used' (Option C).
Legal Metrology • Civil Engineering Paper-II
A body moving through still water at 6 m/sec produces a water velocity of 4 m/sec at a point 1m ahead. The difference in pressure between the nose and the point 1 m ahead would be
A)
2000 N/m²
B)
10000 N/m²
C)
19620 N/m²
D)
98100 N/m²
Option B correctly answers the question regarding Mechanical Engineering.
Legal Metrology • Civil Engineering Paper-II
The direct runoff hydrograph of a storm obtained from a catchment is triangular in shape and has a base period of 80 hours. The peak flow rate is 30 m³/s and catchment area is 86.4 km². The rainfall excess that has resulted the above hydrograph is
A)
5 cm
B)
8 cm
C)
10 cm
D)
16 cm
In the context of Civil Engineering, the most appropriate and technically accurate answer is '16 cm' (Option D).
Legal Metrology • Civil Engineering Paper-II
A 50 ml sample of industrial wastewater is taken into a silica crucible. The empty weight of the crucible is 54.352 g. The crucible with the sample is dried in a hot air oven at 104°C till a constant weight of 55.129 g. Thereafter, the crucible with the dried sample is fired at 600°C for 1 hr in a muffle furnace, and the weight of the crucible along with residue is determined as 54.783 g. The concentration of total volatile solids is
A)
15540 mg/l
B)
8620 mg/l
C)
6920 mg/l
D)
1700 mg/l
In the context of Civil Engineering, the most appropriate and technically accurate answer is '8620 mg/l' (Option B).
Legal Metrology • Civil Engineering Paper-II
An inflow hydrograph is routed through a reservoir to produce an outflow hydrograph. The peak flow of the inflow hydrograph is P₁ and the time of occurrence of the peak is t₁. The peak flow of the outflow hydrograph is P₂ and the time of occurrence of the peak is t₂. Which one of the following statements is correct?
A)
P₁ > P₂ and t₁ > t₂
B)
P₁ > P₂ and t₁ < t₂
C)
P₁ < P₂ and t₁ < t₂
D)
P₁ < P₂ and t₁ > t₂
In the context of Civil Engineering, the most appropriate and technically accurate answer is 'P₁ > P₂ and t₁ < t₂' (Option B).
Legal Metrology • Civil Engineering Paper-II
The intensity of rainfall and time interval of a typical storm are:
0-10 min: 0.7 mm/min
10-20 min: 1.8 mm/min
20-30 min: 2.2 mm/min
30-40 min: 1.5 mm/min
40-50 min: 1.2 mm/min
50-60 min: 1.3 mm/min
60-70 min: 0.9 mm/min
70-80 min: 0.4 mm/min
The maximum intensity of rainfall for 20 minutes duration of the storm is
A)
1.5 mm/minute
B)
1.85 mm/minute
C)
2.2 mm/minute
D)
3.7 mm/minute
In the context of Civil Engineering, the most appropriate and technically accurate answer is '1.5 mm/minute' (Option A).
Legal Metrology • Civil Engineering Paper-II
The parameters in Horton’s infiltration equation [f(t) = f_c + (f_0 - f_c)e⁻ᵏᵗ] are given as, f_0 = 16.2 cm/hour, f_c = 1.34 cm/hour and k = 4.182/hour. For assumed continuous ponding the cumulative infiltration at the end of 2 hours is
A)
2.68 cm
B)
1.50 cm
C)
1.34 cm
D)
4.18 cm
In the context of Civil Engineering, the most appropriate and technically accurate answer is '2.68 cm' (Option A).
Legal Metrology • Civil Engineering Paper-II
During a 3-hour storm event, it was observed that all abstractions other than infiltration are negligible. The rainfall was idealized as 3 one-hour storms of intensity 10 mm/hr, 20 mm/hr and 10 mm/hr respectively and the infiltration was idealized as a Horton curve, f = 6.8 + 8.7e⁻⁰.⁴ᵗ (f in mm/hr and t in hr). What is the effective rainfall?
A)
10.00 mm
B)
11.33 mm
C)
12.43 mm
D)
13.63 mm
In the context of Civil Engineering, the most appropriate and technically accurate answer is '10.00 mm' (Option A).
Legal Metrology • Civil Engineering Paper-II
A liquid of density ρ and dynamic viscosity μ flows steadily down an inclined plane in a thin sheet of constant thickness δ. Neglecting air friction the shear stress on the bottom surface due to the liquid flow is (where θ is the angle the plane makes with the horizontal)
A)
ρgδsinθ
B)
ρgδcosθ
C)
0.5ρgδsinθ
D)
ρgδ
In the context of Mechanical Engineering, the most appropriate and technically accurate answer is 'ρgδsinθ' (Option A).
Legal Metrology • Civil Engineering Paper-II
The present population of a community is 28000 with an average water consumption of 4200 m³/d. The existing water treatment plant has a design capacity of 6000 m³/d. It is expected that the population will increase to 44000 during the next 20 years. The number of years from now when the plant will reach its design capacity, assuming an arithmetic rate of population growth, will be
A)
5.5 years
B)
8.6 years
C)
15.0 years
D)
16.5 years
In the context of Civil Engineering, the most appropriate and technically accurate answer is '16.5 years' (Option D).
Legal Metrology • Civil Engineering Paper-II
The percentage error in the computed discharge over a triangular notch corresponding to an error of 1% in the measurement of the head over the notch would be
A)
1.0
B)
1.5
C)
2.0
D)
2.5
Based on established principles in Mechanical Engineering, the correct and most clinically/technically appropriate choice is '1.5' (Option B).
Legal Metrology • Civil Engineering Paper-II
Match List-I with List-II and select the correct answers
List-I: A. Rainfall intensity, B. Rainfall excess, C. Rainfall averaging, D. Mass curve
List-II: 1. Isohyets, 2. Cumulative rainfall, 3. Hyetograph, 4. Direct runoff hydrograph
A)
A-1, B-3, C-2, D-4
B)
A-3, B-4, C-1, D-2
C)
A-1, B-2, C-4, D-3
D)
A-3, B-4, C-2, D-1
In the context of Civil Engineering, the most appropriate and technically accurate answer is 'A-3, B-4, C-1, D-2' (Option B).
Legal Metrology • Civil Engineering Paper-II
Water flows in a rectangular channel at a depth of 1.20 m and a velocity of 2.4 m/s. A local rise in the bed of 0.60 m will cause
A)
the surface to rise
B)
the surface to fall
C)
a stationary jump to form
D)
a surge to travel upstream
Based on established principles in Mechanical Engineering, the correct and most clinically/technically appropriate choice is 'the surface to fall' (Option B).
Legal Metrology • Civil Engineering Paper-II
The Prandtl mixing length for turbulent flow through pipes is
A)
dependent on shear stress at the wall
B)
a universal constant
C)
zero at the pipe wall
D)
independent of radial distance from pipe axis
Based on established principles in Mechanical Engineering, the correct and most clinically/technically appropriate choice is 'a universal constant' (Option B).
