Civil Engineering Gate Yearwise 

Civil Engineering GATE 2021 Set-2 Questions with Answer

Ques 53 Civil

A rectangular open channel of 6 m width is carrying a discharge of 20 m3/s. Consider the acceleration due to gravity as 9.81 m/s2 and assume water as incompressible and inviscid. The depth of flow in the channel at which the specific energy of the flowing water is minimum for the given discharge will then be

A

0.82 m

B

1.04 m

C

2.56 m

D

3.18 m



Ques 54 Civil

Read the statements given below.
(i) Value of the wind profile exponent for the 'very unstable' atmosphere is smaller than the wind profile exponent for the 'neutral' atmosphere.
(ii) Downwind concentration of air pollutants due to an elevated point source will be inversely proportional to the wind speed.
(iii) Value of the wind profile exponent for the 'neutral' atmosphere is smaller than the wind profile exponent for the 'very unstable' atmosphere.
(iv) Downwind concentration of air pollutants due to an elevated point source will be directly proportional to the wind speed. Select the correct option.

A

(i) is False and (iii) is True

B

(i) is True and (iv) is True

C

(ii) is False and (iii) is False

D

(iii) is False and (iv) is False



Ques 55 Civil

A water filtration unit is made of uniform-size sand particles of 0.4 mm diameter with a shape factor of 0.84 and specific gravity of 2.55. The depth of the filter bed is 0.70 m and the porosity is 0.35. The filter bed is to be expanded to a porosity of 0.65 by hydraulic backwash. If the terminal settling velocity of sand particles during backwash is 4.5 cm/s, the required backwash velocity is

A

5.79 × 10-3 m/s

B

6.35 × 10-3 m/s

C

0.69 cm/s

D

0.75 cm/s



Ques 56 Civil

For a given traverse, latitudes and departures are calculated and it is found that sum of latitudes is equal to +2.1 m and the sum of departures is equal to -2.8 m. The length and bearing of the closing error, respectively, are

A

3.50 m and 53°7'48''NW

B

2.45 m and 53°7'48''NW

C

0.35 m and 53.13°SE

D

3.50 m and 53.13°SE



Ques 57 Civil

From laboratory investigations, the liquid limit, plastic limit, natural moisture content and flow index of a soil specimen are obtained as 60%, 27%, 32% and 27, respectively. The corresponding toughness index and liquidity index of the soil specimen, respectively, are

A

0.15 and 1.22

B

0.19 and 6.60

C

1.22 and 0.15

D

6.60 and 0.19



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