What topics are covered on Page 2 of GATE 2026 Civil Engineering Set 2?

Page 2 contains Questions 14 to 26. It covers water chemistry and chlorination, anaerobic wastewater treatment, air pollution control, hydrostatic forces and centrifugal pumps, followed by General Aptitude questions on grammar, logarithms, logical reasoning, averages, quantitative aptitude and geometry.

What percentage of COD is converted into bacterial biomass in GATE 2026 Civil Set 2?

For the anaerobic wastewater treatment problem with a yield coefficient of 0.06 gram VSS per gram COD, the percentage of COD converted into bacterial biomass is 8 percent.

What is the particle concentration after the cyclone and electrostatic precipitator?

The concentration entering the cyclone is 10 mg per cubic metre. After an 80 percent efficient cyclone followed by a 50 percent efficient electrostatic precipitator, the final concentration is 1.00 mg per cubic metre.

What is the pump head in the GATE 2026 Civil centrifugal pump question?

For the centrifugal pump delivering water through the 2 km long, 250 mm diameter pipe against a static head of 35 m, the generated pump head is approximately 69 m.

Civil Engineering Gate 2026 Set-2 Questions with Answer

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Ques 14 GATE 2026 SET-2

The analysis of major cations and anions in a water sample collected from a city's water supply is given below. Ions present in minor concentrations are not given.

Anions	Concentration (mM)
Cl⁻	1.5
SO₄²⁻	0.5
HCO₃⁻	1.0
CO₃²⁻	0.01

Cations	Concentration (mM)
Na⁺	2
Ca²⁺	0.5
Mg²⁺	0.25
K⁺	0.02

HCl ⇌ H⁺ + Cl⁻, pK = −3
H₂SO₄²⁻ ⇌ 2H⁺ + SO₄²⁻, pK = −3
H₂CO₃ ⇌ H⁺ + HCO₃⁻, pK = 6.3
HCO₃⁻ ⇌ H⁺ + CO₃²⁻, pK = 10.3
HOCl ⇌ H⁺ + OCl⁻, pK = 7.5
HOCl (in %) present in the total free chlorine in the water is _____ (rounded off to the nearest integer).

(0) is the correct answer.

Ques 15 GATE 2026 SET-2

Anaerobic bacteria are being utilized for the destruction of biodegradable organic content of wastewater measured in terms of Chemical Oxygen Demand (COD). The yield coefficient (Y) is 0.06 gram Volatile Suspended Solids (VSS) per gram of COD. Bacterial biomass forms the sludge during the process. The proximate chemical formula of anaerobic bacteria is C₆H₇NO₂.
The COD (in %) converted into bacterial biomass is ______ (rounded off to the nearest integer).

(8) is the correct answer.

Ques 16 GATE 2026 SET-2

In an industry, a cyclone collector with 80 % efficiency is installed for air purification, followed by an electrostatic precipitator with 50 % efficiency. The concentration of particles entering the cyclone collector is 10 mg/m³.
The concentration (in mg/m³) of particles exiting the precipitator is __________ (rounded off to two decimal places).

(1.00) is the correct answer.

Ques 17 GATE 2026 SET-2

The cross section of a 0.5 m wide vertical gate holding water and oil is shown in the figure. The unit weights of water and oil are 10 kN/m³ and 7.5 kN/m³, respectively.

The horizontal hydrostatic force (in kN) acting on the vertical gate is _________ (rounded off to two decimal places).

(5.94) is the correct answer.

Ques 18 GATE 2026 SET-2

A centrifugal pump is delivering water from an underground tank to an overhead reservoir against a static head of 35 m through a 2 km long, 250 mm diameter pipe. The head-discharge characteristic of the pump is given by
H = 140 − 9000Q²
where H is the head (in m) generated by the pump and Q is the discharge (in m³/s) of the pump.
Neglecting all minor losses, the head (in m) generated by the pump is ______ (rounded off to the nearest integer).
Use: Darcy-Weisbach friction factor f = 0.04
Acceleration due to gravity = 9.81 m/s²
π = 3.14

(69) is the correct answer.

Ques 19 GATE 2026 SET-2

'The team ______ more than 300 runs in 20 overs ___________ rains. However, some players needed to improve their batting skills.'
Choose the option with the correct sequence of words to fill the blanks.

score; despite

scoring; instead of

scored; despite

scoring; in spite of

(d) is the correct answer.

Ques 20 GATE 2026 SET-2

If a positive real x satisfies the following equation
log₂ x + log_√2 x = 48,
then the value of x is _________________

2¹⁶

4¹⁶

2¹⁴

4¹⁴

(a) is the correct answer.

Ques 21 GATE 2026 SET-2

The next figure (indicated by '?') in the sequence is (figure-based pattern question)

(d) is the correct answer.

Ques 22 GATE 2026 SET-2

'All the mangoes in the basket are good.'
If the above statement is false, then which one of the following statements is necessarily true?

All the mangoes in the basket are not good.

No mango in the basket is good.

In the basket, some of the mangoes are good and some are not good.

There exists at least one mango in the basket that is not good.

(d) is the correct answer.

Ques 23 GATE 2026 SET-2

Consider the following statements about four numbers:
(S1) The average of the four numbers is 25
(S2) Each number is at most 40
(S3) Each number is at least 20
Choose the option that is necessarily correct.

(S1) and (S2) together imply (S3)

(S2) and (S3) together imply (S1)

(S1) and (S3) together imply (S2)

(S1) implies (S3)

Ques 24 GATE 2026 SET-2

'People are crowding around ___ pit into which ___ elephant has fallen. I have never seen an elephant looking more bewildered ___ miserable. Here it is in a most undignified position, thrust into a pit and made to look up ___ a vast, curiosity-stricken crowd.'
Choose the option with the correct sequence of words to fill the blanks.

an; a; at; and

a; an; and; at

and; a; an; at

at; a; an; and

(b) is the correct answer.

Ques 25 GATE 2026 SET-2

The table lists the unit selling price of five products P, Q, R, S, and T. On a particular day, 250 items were sold with the average selling price of Rs. 60. The following observations were made:
(i) The quantity of S sold was twice that of T.
(ii) The quantity of R sold was thrice that of T.
(iii) The quantity of Q sold was four times that of T.

What is the quantity of product P sold on that day?

(b) is the correct answer.

Ques 26 GATE 2026 SET-2

Consider a string P of length l that is laid out as a straight-line segment. Another string K is laid out as a semicircular arc with string P as its diameter, as represented in Figure (i). When both the strings are shortened by a length x they can be re-arranged such that the shortened string K forms a full circle with the shortened string P as its diameter, as represented in Figure (ii). The value of x/l is __________

(π−1)/2π

π/2(π−1)

π/(π−1)

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