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English SSC CGL Tier I papers. Free 60-minute mocks, 100 questions, 200 marks; +2 correct and −0.5 incorrect. Source: SSC response sheets preserved by SSC Portal. The marked archived keys have not been independently revalidated against final SSC keys; worked explanations are pending review. A/B/C/D correspond to source options 1/2/3/4.

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Question 1 · Civil Engineering (SSC JE) · Hydrology and Irrigation
A tipping bucket rain gauge is
Choose your answer for question 1
Answer and explanation

Correct answer: B

The bucket tips after collecting a fixed depth of rain and each tip is recorded, which gives the rainfall intensity with time.

Question 2 · Civil Engineering (SSC JE) · Hydrology and Irrigation
Duty of water is the area irrigated per unit of
Choose your answer for question 2
Answer and explanation

Correct answer: D

Duty is expressed in hectares per cumec of discharge during the base period.

Question 3 · Civil Engineering (SSC JE) · Hydrology and Irrigation
The relation between delta Δ (metres), base period B (days) and duty D (hectares per cumec) is
Choose your answer for question 3
Answer and explanation

Correct answer: A

One cumec for B days gives 86 400 B m³, which spread over D hectares (10 000 D m²) gives a depth of 8.64 B/D metres.

Question 4 · Civil Engineering (SSC JE) · Hydrology and Irrigation
Which of the following is a rabi crop?
Choose your answer for question 4
Answer and explanation

Correct answer: A

Rabi crops such as wheat, gram and mustard are sown in October–November and harvested in March–April.

Question 5 · Civil Engineering (SSC JE) · Hydrology and Irrigation
A gravity dam resists the forces acting on it mainly by
Choose your answer for question 5
Answer and explanation

Correct answer: B

The dam is stable because its weight and the shape of its section provide enough resistance against sliding and overturning.

Question 6 · Civil Engineering (SSC JE) · Hydrology and Irrigation
In Lacey’s regime theory, the silt factor f is given by (d = mean particle size in mm)
Choose your answer for question 6
Answer and explanation

Correct answer: B

Lacey’s silt factor is f = 1.76 √d with d in mm.

Question 7 · Civil Engineering (SSC JE) · Hydrology and Irrigation
The main difference between a weir and a barrage is that a barrage
Choose your answer for question 7
Answer and explanation

Correct answer: C

A barrage controls the water level mainly with gates on a low crest, while a weir holds the level with a high solid crest.

Question 8 · Civil Engineering (SSC JE) · Hydrology and Irrigation
A hydrograph is a graph showing
Choose your answer for question 8
Answer and explanation

Correct answer: C

A hydrograph plots stream discharge as a function of time at a particular section.

Question 9 · Civil Engineering (SSC JE) · Hydrology and Irrigation
A crop has a duty of 1000 hectares per cumec over a base period of 100 days. The delta is
Choose your answer for question 9
Answer and explanation

Correct answer: D

Δ = 8.64 B/D = 8.64 × 100 / 1000 = 0.864 m.

Question 10 · Civil Engineering (SSC JE) · Hydrology and Irrigation
Water application efficiency is the ratio of
Choose your answer for question 10
Answer and explanation

Correct answer: B

It shows how well water given to a field is retained for use by the crop, as opposed to deep percolation and runoff.

Question 11 · Civil Engineering (SSC JE) · Hydrology and Irrigation
The main purpose of lining an irrigation canal is to
Choose your answer for question 11
Answer and explanation

Correct answer: B

Lining reduces seepage, waterlogging and weed growth, and permits higher velocities and smaller sections.

Question 12 · Civil Engineering (SSC JE) · Hydrology and Irrigation
A structure that carries canal water over a natural drainage is called
Choose your answer for question 12
Answer and explanation

Correct answer: A

In an aqueduct the canal is over the drainage. In a super passage the drainage flows over the canal.

Question 13 · Civil Engineering (SSC JE) · Hydrology and Irrigation
A unit hydrograph represents the direct runoff hydrograph resulting from
Choose your answer for question 13
Answer and explanation

Correct answer: D

Direct runoff from a storm of the same duration is found by scaling and adding the ordinates of the unit hydrograph.

Question 14 · Civil Engineering (SSC JE) · Hydrology and Irrigation
In the rational formula Q = CiA/360, with Q in m³/s and i in mm/h, the catchment area A is in
Choose your answer for question 14
Answer and explanation

Correct answer: C

Check: 1 mm/h over 1 ha = 10 m³/h = 1/360 m³/s. So A in hectares gives the factor 360.

Question 15 · Civil Engineering (SSC JE) · Hydrology and Irrigation
The storage in a reservoir below the minimum pool level, which cannot be drawn on for supply, is called
Choose your answer for question 15
Answer and explanation

Correct answer: D

Dead storage collects the silt and allows for the sill level of the lowest outlet.

Question 16 · Civil Engineering (SSC JE) · Hydrology and Irrigation
The consumptive use of water by a crop is the sum of
Choose your answer for question 16
Answer and explanation

Correct answer: A

Consumptive use (evapotranspiration) covers water lost through the soil surface and through the plant leaves, plus the small amount stored in plant tissue.

Question 17 · Civil Engineering (SSC JE) · Hydrology and Irrigation
A crop has a base period of 100 days and a duty of 1500 hectares per cumec. Its delta (Δ = 8.64B/D) is
Choose your answer for question 17
Answer and explanation

Correct answer: A

Δ = 8.64 B/D, with B in days, D in ha/cumec and Δ in metres. Δ = 8.64 × 100/1500 = 0.576 m.

Question 18 · Civil Engineering (SSC JE) · Hydrology and Irrigation
A canal has to irrigate 5000 hectares of a crop whose duty at the field is 1500 hectares per cumec. The discharge required at the field is
Choose your answer for question 18
Answer and explanation

Correct answer: D

Q = Area / Duty = 5000/1500 = 3.333 cumec.

Question 19 · Civil Engineering (SSC JE) · Hydrology and Irrigation
In a storm of 4 hours, the total rainfall was 8 cm and the direct runoff was 3 cm. The Φ-index is
Choose your answer for question 19
Answer and explanation

Correct answer: B

Φ-index = (P − R)/t = (8 − 3)/4 = 1.25 cm/h.

Question 20 · Civil Engineering (SSC JE) · Hydrology and Irrigation
A canal is to be designed by Lacey’s theory in a bed material of mean particle size 0.23 mm. The silt factor f = 1.76√d is
Choose your answer for question 20
Answer and explanation

Correct answer: C

f = 1.76 × √0.23 = 0.844.

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