GATE CE 2020 Paper 2 — page 16

Questions 46–48 of 65. Imported answers require review unless explicitly marked reviewed.

Crops are grown in a field having soil, which has field capacity of 30% and permanent wilting point of 13%. The effective depth of root zone is 80 cm. Irrigation water is supplied when the average soil moisture drops to 20%. Consider density of the soil as 1500 kg/m³ and density of water as 1000 kg/m³. If the daily consumptive use of water for the crops is 2 mm, the frequency of irrigating the crops (in days), is

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Alkalinity of water, in equivalent/litre (eq/litre), is given by

Where, represents concentration in mol/litre. For a water sample, the concentrations of HCO₃⁻ = 2×10⁻³ mol/litre, CO₃²⁻ = 3.0 × 10⁻⁴ mol/litre and the pH of water = 9.0. The atomic weights are: Ca = 40; C = 12; and O = 16. If the concentration of OH⁻ and H⁺ are NEGLECTED, the alkalinity of the water sample (in mg/litre as CaCO₃), is

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130.4

100.0

50.0

65.2

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A theodolite was set up at a station P. The angle of depression to a vane 2 m above the foot of a staff held at another station Q was 45°. The horizontal distance between stations P and Q is 20 m. The staff reading at a benchmark S of RL 433.050 m is 2.905 m. Neglecting the errors due to curvature and refraction, the RL of the station Q (in m, is

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413.050

413.955

431.050

435.955

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2020 · Paper 2

Question 36

Question 37

Question 38