Exam: UPSSSC-JE
Topic: Irrigation & Hydrology
Each question carries 1 mark
Negative marking: 1/3 mark
Time: 10 Minutes
Q1. The relation between duty ‘D’ in hect/m³/sec. delta ‘Δ’ in m and base period ‘B’ in days is
(a) Δ = 8.64 D/B
(b) B = 8.64 Δ/D
(c) D = 8.64 Δ/B
(d) Δ = 8.64 B/D
L1Difficulty 2
QTags Irrigation Engineering
QCereator Ashwani Jain
Q2. The optimum depth of kor watering for wheat crop, is
(a) 13.5 cm
(b) 17.5 cm
(c) 19.5 cm
(d) 2.5 cm
L1Difficulty 3
QTags Irrigation Engineering
QCereator Ashwani Jain
Q3. Lacey’s silt factor for medium silt whose average gain size is 0.25 mm, is likely to be:
(a) 0.66
(b) 0.77
(c) 0.88
(d) 0.99
L1Difficulty 4
QTags Irrigation Engineering
QCereator Ashwani Jain
Q4. A canal which is aligned at right angles to the contour is called
(a) Branch canal
(b) Contour canal
(c) Side slope canal
(d) Water shed canal
L1Difficulty 3
QTags Irrigation Engineering
QCereator Ashwani Jain
Q5. The elementary profile of a dam is
(a) a square
(b) a right angle triangle
(c) an arc of a circle
(d) parabolic
L1Difficulty 2
QTags Irrigation Engineering
QCereator Ashwani Jain
Q6. Double mass curve technique is followed to
(a) check the consistency of rain gauge record
(b) find the average rainfall over a number of year
(c) find the number of rain gauge required
(d) estimate the missing precipitation values
L1Difficulty 2
QTags Irrigation Engineering
QCereator Ashwani Jain
Q7. Lysimeter is used for measuring
(a) Infiltration
(b) Evaporation
(c) Vapour pressure
(d) Evapo-transpiration
L1Difficulty 1
QTags Irrigation Engineering
QCereator Ashwani Jain
Q8. Standard rain gauge adopted in India is :
(a) None of the above
(b) Tipping bucket type
(c) Weighing bucket type
(d) Natural syphon type
L1Difficulty 3
QTags Irrigation Engineering
QCereator Ashwani Jain
Q9. Unit Hydrograph Theory was enunciated by
(a) Merrill Bernard
(b) W.W. Horner
(c) Le-Roy K. Shermen
(d) Robert E-Horten
L1Difficulty 2
QTags Irrigation Engineering
QCereator Ashwani Jain
Q10. The plot between rainfall intensity and time is called
(a) Mass curve
(b) Hyetograph
(c) Isohyetal
(d) Hydrograph
L1Difficulty 2
QTags Irrigation Engineering
QCereator Ashwani Jain
SOLUTIONS
S1. Ans.(d)
Sol. Relation between Duty (in hect./m³/sec or ha/cumecs) and Delta (in m.) is given by
B= Base period (in days)
S2. Ans.(a)
Sol.
| Crop | Kor depth (in cm.) |
| Wheat | 13.5 |
| Sugarcane | 16.5 |
| Rice | 19.0 |
S3. Ans.(c)
Sol. Given, dmm = 0.25 mm
Lacey’s silt factor (f) = 1.76
= 1.76
= 0.88
S4. Ans.(c)
Sol. Side slope canal aligned at right angles to the contour.
S5. Ans.(b)
Sol. The elementary profile of a gravity dam is right angle triangle.
S6. Ans.(a)
Sol. Double mass curve technique is followed to check the consistency of rain gauge record. It is used to correct the inconsistency of precipitation records.
S7. Ans.(d)
Sol. Lysimeter is used to measure evapo-transpiration.
S8. Ans.(d)
Sol. Natural syphon rain gauge is adopted in India. It is similar to weighing bucket rain gauge. It is recording type of rain gauge.
S9. Ans.(c)
Sol. A unit hydrograph is direct runoff hydrograph resulting from a runoff depth of 1cm or 1 inch or 1 mm etc. This theory is given by Le-Roy K.Sherman in 1932.
S10. Ans.(b)
Sol. Hyetograph is a plot between rainfall intensity with time.
