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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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SSC CGL Tier I - 09 September 2024 - Shift 1

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Civil Engineering (SSC JE)

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Question 1 · Civil Engineering (SSC JE) · Environmental Engineering

The standard BOD test is conducted at

A. 27 °C for 3 days B. 20 °C for 5 days C. 37 °C for 5 days D. 20 °C for 10 days

Answer and explanation

Correct answer: B

Standard BOD5 is the oxygen consumed by microorganisms in 5 days at 20 °C.

Question 2 · Civil Engineering (SSC JE) · Environmental Engineering

Hardness of water caused by the bicarbonates of calcium and magnesium is called

A. temporary hardness B. residual hardness C. total alkalinity D. permanent hardness

Answer and explanation

Correct answer: A

Boiling converts the bicarbonates into insoluble carbonates, which precipitate, so this hardness is called temporary.

Question 3 · Civil Engineering (SSC JE) · Environmental Engineering

As per BIS drinking water standards, the acceptable pH range is

A. 4.0 to 7.0 B. 8.5 to 10.5 C. 6.5 to 8.5 D. 5.0 to 6.0

Answer and explanation

Correct answer: C

IS 10500 specifies a pH of 6.5 to 8.5 for drinking water.

Question 4 · Civil Engineering (SSC JE) · Environmental Engineering

According to Stokes’ law, the settling velocity of a spherical particle in water is proportional to

A. its diameter B. the cube of its diameter C. the square root of its diameter D. the square of its diameter

Answer and explanation

Correct answer: D

v = g(ρs − ρ)d² / 18μ, so velocity varies with d².

Question 5 · Civil Engineering (SSC JE) · Environmental Engineering

The activated sludge process is a

A. biological aerobic treatment process B. chemical precipitation process C. anaerobic digestion process D. physical screening process

Answer and explanation

Correct answer: A

Microorganisms in an aerated tank oxidise organic matter. Part of the settled sludge is returned to the tank to keep the biomass high.

Question 6 · Civil Engineering (SSC JE) · Environmental Engineering

Which gas is mainly responsible for acid rain?

A. Carbon monoxide B. Methane C. Argon D. Sulphur dioxide

Answer and explanation

Correct answer: D

SO2 and nitrogen oxides combine with water vapour in the air and form sulphuric and nitric acids.

Question 7 · Civil Engineering (SSC JE) · Environmental Engineering

In the arithmetic increase method of population forecasting, the population after n decades is

A. P (1 + r)ⁿ B. P − n x̄ C. P + n x̄, where x̄ is the average increase per decade D. P × n x̄

Answer and explanation

Correct answer: C

The method assumes a constant numerical increase per decade, so Pn = P0 + n x̄.

Question 8 · Civil Engineering (SSC JE) · Environmental Engineering

The main gas produced during anaerobic digestion of sewage sludge is

A. oxygen B. chlorine C. nitrogen D. methane

Answer and explanation

Correct answer: D

Anaerobic digestion yields biogas of roughly 60 to 70 percent methane and 30 to 40 percent carbon dioxide.

Question 9 · Civil Engineering (SSC JE) · Environmental Engineering

A town of 50 000 people has a water demand of 135 litres per capita per day. The average daily demand is

A. 0.675 million litres B. 5.0 million litres C. 67.5 million litres D. 6.75 million litres

Answer and explanation

Correct answer: D

50 000 × 135 = 6 750 000 litres per day.

Question 10 · Civil Engineering (SSC JE) · Environmental Engineering

A sedimentation tank receives 1800 m³/day and has a plan area of 60 m². The surface overflow rate is

A. 0.033 m³/m²/day B. 3 m³/m²/day C. 30 m³/m²/day D. 108 m³/m²/day

Answer and explanation

Correct answer: C

Overflow rate = Q/A = 1800 / 60 = 30 m³/m²/day.

Question 11 · Civil Engineering (SSC JE) · Environmental Engineering

Beyond the breakpoint of chlorination, additional chlorine added to water appears as

A. combined residual chlorine B. chloramines C. chlorides D. free residual chlorine

Answer and explanation

Correct answer: D

Up to the breakpoint chlorine is consumed by reactions with ammonia and organic matter. After it, the added chlorine stays as free chlorine.

Question 12 · Civil Engineering (SSC JE) · Environmental Engineering

In water treatment, alum reacts with the alkalinity of water to form

A. free chlorine B. sodium chloride C. calcium carbonate scale D. aluminium hydroxide floc

Answer and explanation

Correct answer: D

Al₂(SO₄)₃ + 3Ca(HCO₃)₂ → 2Al(OH)₃ + 3CaSO₄ + 6CO₂. The gelatinous floc traps suspended particles.

Question 13 · Civil Engineering (SSC JE) · Environmental Engineering

The main purpose of a trap in a house drainage system is to

A. increase the flow velocity B. trap rainwater for reuse C. filter the sewage D. prevent foul gases from entering the building

Answer and explanation

Correct answer: D

A water seal in the trap stops sewer gas from coming back through the fixture.

Question 14 · Civil Engineering (SSC JE) · Environmental Engineering

The CPCB ambient noise standard for a residential area during the day is

A. 45 dB(A) B. 75 dB(A) C. 90 dB(A) D. 55 dB(A)

Answer and explanation

Correct answer: D

The standard limit is 55 dB(A) in the day and 45 dB(A) at night for residential zones.

Question 15 · Civil Engineering (SSC JE) · Environmental Engineering

Composting of solid waste is

A. burning of waste at high temperature B. burial of waste in a landfill without air C. aerobic biological decomposition of organic matter into humus D. separation of metals using magnets

Answer and explanation

Correct answer: C

Microorganisms decompose the organic fraction in the presence of oxygen, producing a stable compost.

Question 16 · Civil Engineering (SSC JE) · Environmental Engineering

An electrostatic precipitator is used for removing

A. particulate matter from flue gases B. ozone from the atmosphere C. carbon monoxide from exhaust D. sulphur dioxide from air

Answer and explanation

Correct answer: A

It charges dust particles and collects them on oppositely charged plates. It is not effective on gases.

Question 17 · Civil Engineering (SSC JE) · Environmental Engineering

A rooftop of 200 m² receives an annual rainfall of 1000 mm. With a runoff coefficient of 0.7, the volume of water that can be harvested in a year is

A. 140 m³ B. 140000 m³ C. 70 m³ D. 200 m³

Answer and explanation

Correct answer: A

Volume = area × rainfall × C = 200 × 1 × 0.7 = 140 m³.

Question 18 · Civil Engineering (SSC JE) · Environmental Engineering

A rapid sand filter system must treat 3000 m³/day at a filtration rate of 4 m³/m²/hour. The total filter area required is

A. 62.5 m² B. 31.3 m² C. 500 m² D. 750 m²

Answer and explanation

Correct answer: B

Area = Q / rate = 3000 / (4 × 24) = 31.3 m².

Question 19 · Civil Engineering (SSC JE) · Environmental Engineering

A rooftop of 100 m² receives an annual rainfall of 400 mm. With a runoff coefficient of 0.7, the volume of water that can be harvested in a year is

A. 40 m³ B. 112 m³ C. 28000 m³ D. 28 m³

Answer and explanation

Correct answer: D

Volume = area × rainfall × C = 100 × 0.4 × 0.7 = 28 m³.

Question 20 · Civil Engineering (SSC JE) · Environmental Engineering

A rapid sand filter system must treat 3000 m³/day at a filtration rate of 6 m³/m²/hour. The total filter area required is

A. 500 m² B. 41.7 m² C. 20.8 m² D. 750 m²

Answer and explanation

Correct answer: C

Area = Q / rate = 3000 / (6 × 24) = 20.8 m².

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SSC · Environmental Engineering practice

Previous-year papers · timed practice

SSC CGL Tier I - 09 September 2024 - Shift 1

SSC CGL Tier I - 09 September 2024 - Shift 2

SSC CGL Tier I - 09 September 2024 - Shift 3

SSC CGL Tier I - 10 September 2024 - Shift 1

SSC CGL Tier I - 10 September 2024 - Shift 2

SSC CGL Tier I - 10 September 2024 - Shift 3

SSC CGL Tier I - 11 September 2024 - Shift 1

SSC CGL Tier I - 11 September 2024 - Shift 2

SSC CGL Tier I - 11 September 2024 - Shift 3

SSC CGL Tier I - 12 September 2024 - Shift 1

SSC CGL Tier I - 12 September 2024 - Shift 2

SSC CGL Tier I - 12 September 2024 - Shift 3

SSC CGL Tier I - 13 September 2024 - Shift 1

SSC CGL Tier I - 13 September 2024 - Shift 2

SSC CGL Tier I - 13 September 2024 - Shift 3

SSC CGL Tier I - 17 September 2024 - Shift 1

SSC CGL Tier I - 17 September 2024 - Shift 2

SSC CGL Tier I - 17 September 2024 - Shift 3

SSC CGL Tier I - 18 September 2024 - Shift 1

SSC CGL Tier I - 18 September 2024 - Shift 2

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