part - 3
Q48. Pick up the correct statement from the following:
A. The full supply level of a canal should be above ground level
B. According to Lacey, regime conditions require a particular slope for a given discharge and silt factor
C. In case the ground slope is less than the required bed slope, the silt factor must be reduced by permitting the entry of coarse silt
D. All the above
✅ Answer: D) All the above
💡 Explanation: All the statements are valid under canal design principles.
Q49. If d₁ is the depth of cutting and d₂ is the height of the bank from bed level, the horizontal distance between bed and bank is:
A. x = r₁d₁
B. x = r₂d₂
C. x = d₁/r₁
D. x = d₂/r₂
✅ Answer: B) x = r₂d₂
Q50. According to Kennedy, silt transporting power is proportional to:
A. V₀¹/²
B. V₀³/²
C. V₀⁵/²
D. V₀⁷/²
✅ Answer: C) V₀⁵/²
Q51. Regime conditions in a channel may occur if:
A. Discharge is constant
B. Channel flows uniformly in incoherent alluvium
C. Silt grade and charge are constant
D. All the above
✅ Answer: D) All the above
Q52. A river is said to be:
A. Aggrading type
B. Degrading type
C. Meandering type
D. All the above
✅ Answer: D) All the above
Q53. The ratio of rate of change of discharge of an outlet and parent channel is called:
A. Efficiency
B. Sensitivity
C. Flexibility
D. Modular limit
✅ Answer: C) Flexibility
Q54. The width of a dowla is generally kept between:
A. 10–20 cm
B. 20–30 cm
C. 30–60 cm
D. 60–90 cm
✅ Answer: C) 30–60 cm
Q55. Pick up the correct statement:
A. Water table follows ground surface
B. Static water level indicates water table
C. Hydrostatic pressure at water table is zero
D. All the above
✅ Answer: D) All the above
Q56. Lacey's equation for calculating flood discharge:
A. V = 10.8R¹/²S¹/²
B. V = 10.8R²/³S¹/²
C. V = 10.8R²/³S¹/³
D. V = 10.8R¹/³S²/³
✅ Answer: C) V = 10.8R²/³S¹/³
Q57. Deficit of sediments in flowing water causes:
A. Meandering type
B. Aggrading type
C. Degrading type
D. Sub-critical type
✅ Answer: C) Degrading type
Q58. Side slopes generally kept for canals in loam soil are:
A. 1:1 in cutting and 1.5:1 in filling
B. 1.5:1 in cutting and 2:1 in filling
C. Neither A nor B
D. Both A and B
✅ Answer: D) Both A and B
Q59. Critical gradient according to Khosla's creep theory:
A. 0
B. 0.25
C. 0.50
D. 1.00
✅ Answer: D) 1.00
Q60. Combined losses due to evaporation and seepage:
A. (1/50)(B+d)²/³
B. (1/100)(B+d)²/³
C. (1/150)(B+d)²/³
D. (1/200)(B+d)²/³
✅ Answer: D) (1/200)(B+d)²/³


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