GATE CE format:nat PYQs & Answers — Page 34

Questions 331–340 of 495. Imported answers require independent review unless marked reviewed.

Topic practice 495 questionsPage 34 of 50

Surface Overflow Rate (SOR) of a primary settling tank (discrete settling) is 2000 litre/m

per day. Kinematic viscosity of water in the tank is 1.01×10

/s. Specific gravity of the settling particles is 2.64. Acceleration due to gravity is 9.81 m/s

. The minimum diameter (in μm, round off to one decimal place) of the particles that will be removed with 80% efficiency in the tank, is _____.

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The ion product of water (pK_w) is 14. If a rain water sample has a pH of 5.6, the concentration of OH⁻ in the same (in 10⁻⁹ mol/litre, round off to one decimal place), is ________.

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A gaseous chemical has a concentration of 41.6 μmol/m

in air at 1 atm pressure and temperature 293 K. The universal gas constant

is 82.05×10

atm)/(mol K). Assuming that ideal gas law is valid, the concentration of the gaseous chemical (in ppm, round off to one decimal place), is _____.

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A waste to energy plant burns dry solid waste of composition: Carbon = 35%, Oxygen = 26%, Hydrogen = 10%, Sulphur = 6%, Nitrogen = 3% and Inerts = 20%. Burning rate is 1000 tonnes/d. Oxygen in air by weight is 23%. Assume complete conversion of Carbon to CO₂, Hydrogen to H₂O, Sulphur to SO₂ and Nitrogen to NO₂.

Given Atomic weights: H = 1, C = 12, N = 14, O = 16, S = 32

The stoichiometric (theoretical) amount of air (in tonnes/d, round off to the nearest integer) required for complete burning of this waste, is ________.

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A stream with a flow rate of 5 m

/s is having an ultimate BOD of 30 mg/litre. A wastewater discharge of 0.20 m

/s having BOD

of 500 mg/litre joins the stream at a location and instantaneously gets mixed up completely. The cross-sectional area of the stream is 40 m

which remains constant. BOD exertion rate constant is 0.3 per day (logarithm base e). The BOD (in mg/litre, round off to two decimal places) remaining at 3 km downstream from the mixing location, is _____.

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A sample of water contains an organic compound C₈H₁₆O₈ at a concentration of 10⁻³ mol/litre. Given that the atomic weight of C = 12 g/mol, H = 1 g/mol, and O = 16 g/mol, the theoretical oxygen demand of water (in g of O₂ per litre, round off to two decimal places), is ________.

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The lengths and bearings of a traverse PQRS are:

Segment	Length (m)	Bearing
PQ	40	80°
QR	50	10°
RS	30	210°

The length of line segment SP (in m, round off to two decimal places), is _____.

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A theodolite is set up at station A. The RL of instrument axis is 212.250 m. The angle of elevation to the top of a 4 m long staff, held vertical at station B, is 7°. The horizontal distance between stations A and B is 400 m. Neglecting the errors due to curvature of earth and refraction, the RL (in m, round off to three decimal places) of station B is ________.

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For a given loading on a rectangular plain concrete beam with an overall depth of 500

, the compressive strain and tensile strain developed at the extreme fibers are of the same magnitude of

. The curvature in the beam cross-section (in

, round off to 3 decimal places), is ________.

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A completely mixed dilute suspension of sand particles having diameters 0.25, 0.35, 0.40, 0.45 and 0.50

are filled in a transparent glass column of diameter 10

and height 2.50

. The suspension is allowed to settle without any disturbance. It is observed that all particles of diameter 0.35

settle to the bottom of the column in 30

. For the same period of 30

the percentage removal (round off to integer value) of particles of diameters 0.45 and 0.50

from the suspension is ________.

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GATE CE format:nat PYQs

Question 52

Question 52

Question 53

Question 53

Question 54

Question 54

Question 55

Question 55

Question 19

Question 20