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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 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
The SI unit of kinematic viscosity is
Choose your answer for question 1
Answer and explanation

Correct answer: D

ν = μ/ρ, so its unit is m²/s. N·s/m² is the unit of dynamic viscosity.

Question 2 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
A difference of 100 mm of mercury (density 13 600 kg/m³) corresponds to a pressure difference of about
Choose your answer for question 2
Answer and explanation

Correct answer: A

Δp = ρgh = 13 600 × 9.81 × 0.1 = 13 342 Pa ≈ 13.3 kPa.

Question 3 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
A Pitot tube is used to measure
Choose your answer for question 3
Answer and explanation

Correct answer: D

It senses the stagnation pressure, and with the static pressure gives the velocity head.

Question 4 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
The Reynolds number is the ratio of
Choose your answer for question 4
Answer and explanation

Correct answer: B

Re = ρVD/μ. It decides whether flow is laminar or turbulent.

Question 5 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
Cavitation in a pump occurs when the pressure at some point in the liquid falls below
Choose your answer for question 5
Answer and explanation

Correct answer: C

Vapour bubbles form and later collapse violently on reaching higher pressure, causing noise, vibration and pitting.

Question 6 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
A Kaplan turbine is
Choose your answer for question 6
Answer and explanation

Correct answer: D

The Kaplan runner has adjustable blades and suits large discharges at low heads.

Question 7 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
The overall efficiency of a centrifugal pump is the product of
Choose your answer for question 7
Answer and explanation

Correct answer: D

η = ηh × ηm × ηv, covering the losses in the flow passages, the bearings and the leakage.

Question 8 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
An air vessel is fitted to a reciprocating pump to
Choose your answer for question 8
Answer and explanation

Correct answer: C

The vessel absorbs surges of flow, so a steadier stream flows in the pipe and the pump can run at higher speed.

Question 9 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
In a hydraulic press, the small piston has an area of 10 cm² and the large piston 500 cm². A force of 200 N on the small piston produces a force on the large piston of
Choose your answer for question 9
Answer and explanation

Correct answer: B

Pressure is the same on both pistons: F2 = F1 × (A2/A1) = 200 × 50 = 10 000 N.

Question 10 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
In the Buckingham π theorem, if there are n variables and m fundamental dimensions, the number of dimensionless groups is
Choose your answer for question 10
Answer and explanation

Correct answer: B

The variables are reduced to (n − m) independent dimensionless π terms.

Question 11 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
Separation of the boundary layer from a surface takes place because of
Choose your answer for question 11
Answer and explanation

Correct answer: D

When the pressure rises in the flow direction, the fluid near the wall loses momentum and the flow reverses.

Question 12 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
The draft tube of a reaction turbine
Choose your answer for question 12
Answer and explanation

Correct answer: A

A gradually widening tube recovers energy and keeps the runner exit pressure below atmospheric, adding to the effective head.

Question 13 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
Air of density 1.2 kg/m³ flows at 10 m/s through a duct of area 0.01 m². The mass flow rate is
Choose your answer for question 13
Answer and explanation

Correct answer: A

ṁ = ρAV = 1.2 × 0.01 × 10 = 0.12 kg/s.

Question 14 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
The flow of a gas is supersonic when the Mach number is
Choose your answer for question 14
Answer and explanation

Correct answer: B

Mach number M = V/c, where c is the speed of sound. M = 1 is sonic flow.

Question 15 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
A Pitot-static tube in air (ρ = 1.2 kg/m³) reads a pressure difference of 1.8 kPa between the stagnation and static pressures. The air velocity is
Choose your answer for question 15
Answer and explanation

Correct answer: A

v = √(2Δp/ρ) = √(2 × 1800 / 1.2) = √3000 = 54.8 m/s.

Question 16 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
In fully developed laminar flow in a circular pipe, the maximum velocity is
Choose your answer for question 16
Answer and explanation

Correct answer: A

The parabolic profile has umax = 2 × the average velocity.

Question 17 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
For laminar flow in a pipe at a Reynolds number of 1600, the Darcy friction factor is
Choose your answer for question 17
Answer and explanation

Correct answer: D

f = 64/Re = 64/1600 = 0.04.

Question 18 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
A pump delivers 0.05 m³/s of water against a head of 20 m with an overall efficiency of 70 percent. The input power is about
Choose your answer for question 18
Answer and explanation

Correct answer: C

Hydraulic power = ρgQH = 9810 × 0.05 × 20 = 9.81 kW. Input = 9.81/0.7 = 14.0 kW.

Question 19 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
The specific speed of a hydraulic turbine, in terms of the speed N, power P and head H, is
Choose your answer for question 19
Answer and explanation

Correct answer: D

For turbines Ns = N√P / H^(5/4). The expression N√Q / H^(3/4) is the specific speed of a pump.

Question 20 · Mechanical Engineering (SSC JE) · Fluid Mechanics and Machines
If the speed of a centrifugal pump is doubled, the head produced (by the affinity laws) becomes
Choose your answer for question 20
Answer and explanation

Correct answer: D

H ∝ N² D², so doubling N makes H four times, Q twice and power eight times.

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