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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) · Fluid Mechanics and Hydraulics
The gauge pressure at a depth of 10 m in still water is approximately (g = 9.81 m/s²)
Choose your answer for question 1
Answer and explanation

Correct answer: C

p = ρgh = 1000 × 9.81 × 10 = 98 100 Pa = 98.1 kPa.

Question 2 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
Flow in a circular pipe is generally laminar when the Reynolds number is below about
Choose your answer for question 2
Answer and explanation

Correct answer: C

Flow is laminar for Re < 2000, transitional between about 2000 and 4000, and turbulent beyond that.

Question 3 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
Bernoulli’s equation for steady, incompressible, non-viscous flow is a statement of the conservation of
Choose your answer for question 3
Answer and explanation

Correct answer: A

The sum of pressure head, velocity head and datum head stays constant along a streamline, which expresses energy conservation.

Question 4 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
Water flows at 2 m/s in a pipe of 20 cm diameter that reduces to 10 cm diameter. The velocity in the smaller section is
Choose your answer for question 4
Answer and explanation

Correct answer: C

A1V1 = A2V2. Area is proportional to d², so V2 = 2 × (20/10)² = 8 m/s.

Question 5 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
The discharge over a right-angled triangular notch varies with the head H as
Choose your answer for question 5
Answer and explanation

Correct answer: D

For a V-notch Q = (8/15) Cd √(2g) tan(θ/2) H^(5/2). A rectangular notch varies as H^(3/2).

Question 6 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
A hydraulic jump occurs when the flow changes from
Choose your answer for question 6
Answer and explanation

Correct answer: C

A jump forms when a fast, shallow (supercritical) stream meets a slower, deeper (subcritical) one, with energy loss and a rise in depth.

Question 7 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
In Manning’s formula, the mean velocity of flow is proportional to the hydraulic radius R raised to the power
Choose your answer for question 7
Answer and explanation

Correct answer: A

Manning’s formula is V = (1/n) R^(2/3) S^(1/2).

Question 8 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
For the most economical rectangular channel section, the depth of flow is
Choose your answer for question 8
Answer and explanation

Correct answer: D

For a rectangle the best hydraulic section has b = 2y, and then R = y/2.

Question 9 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
A venturimeter is used to measure
Choose your answer for question 9
Answer and explanation

Correct answer: C

It uses the pressure drop between the inlet and the throat of a converging-diverging pipe section to find the discharge.

Question 10 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
The theoretical velocity of efflux from a small orifice under a constant head of 5 m (g = 9.81 m/s²) is
Choose your answer for question 10
Answer and explanation

Correct answer: C

Torricelli’s theorem gives v = √(2gh) = √(2 × 9.81 × 5) = √98.1 = 9.9 m/s.

Question 11 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
A vertical rectangular gate 2 m wide and 3 m deep has its top edge level with the free water surface. The total hydrostatic force on it is (γ = 9.81 kN/m³)
Choose your answer for question 11
Answer and explanation

Correct answer: C

F = γ A h̄ = 9.81 × (2 × 3) × 1.5 = 88.29 kN.

Question 12 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
The centre of pressure on a vertical rectangular plate with its top edge at the free surface lies below the surface at
Choose your answer for question 12
Answer and explanation

Correct answer: B

h* = h̄ + I/(A h̄) = d/2 + (bd³/12)/(bd × d/2) = d/2 + d/6 = 2d/3.

Question 13 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
A floating body is in stable equilibrium if its metacentre lies
Choose your answer for question 13
Answer and explanation

Correct answer: D

A positive metacentric height (GM > 0) gives a restoring couple when the body is tilted.

Question 14 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
Water flows at 2 m/s through a 100 mm diameter pipe 100 m long with a friction factor f = 0.02. The head loss by the Darcy-Weisbach equation is about
Choose your answer for question 14
Answer and explanation

Correct answer: B

hf = f L V² / (2 g d) = 0.02 × 100 × 4 / (2 × 9.81 × 0.1) = 8 / 1.962 ≈ 4.08 m.

Question 15 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
The hydraulic grade line represents the sum of
Choose your answer for question 15
Answer and explanation

Correct answer: A

The HGL is the piezometric level. The energy grade line is higher than it by the velocity head V²/2g.

Question 16 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
A centrifugal pump must be primed before starting in order to
Choose your answer for question 16
Answer and explanation

Correct answer: D

A pump full of air cannot create enough suction to lift water, since air is far lighter than water.

Question 17 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
A Pelton wheel is an impulse turbine most suitable for
Choose your answer for question 17
Answer and explanation

Correct answer: D

Water jets strike the buckets at atmospheric pressure, which suits mountain sites with a high head.

Question 18 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
For a Newtonian fluid, the shear stress is proportional to
Choose your answer for question 18
Answer and explanation

Correct answer: A

Newton’s law of viscosity is τ = μ du/dy, where μ is the dynamic viscosity.

Question 19 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
Flow in a circular pipe has a Reynolds number of 33614. The flow is
Choose your answer for question 19
Answer and explanation

Correct answer: A

Flow in a pipe is laminar for Re < 2000, turbulent for Re > 4000, and in the transition range between them. 33614 falls in the turbulent range.

Question 20 · Civil Engineering (SSC JE) · Fluid Mechanics and Hydraulics
A block of density 900 kg/m³ floats in water. The fraction of its volume submerged is
Choose your answer for question 20
Answer and explanation

Correct answer: C

Submerged fraction = ρbody/ρfluid = 900/1000 = 0.9.

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