Civil Engineering Gate 2021 Set-1 Questions with Answer

Ques 1 GATE 2021 SET-1

A secondary clarifier handles a total flow of 9600 m³/d from the aeration tank of a conventional activated-sludge treatment system. The concentration of solids in the flow from the aeration tank is 3000 mg/L. The clarifier is required to thicken the solids to 12000 mg/L and hence it is to be designed for a solid flux of 3.2 kg/m²-h. The surface area of the designed clarifier for thickening (in m³, in integer) is _______.

Ques 2 GATE 2021 SET-1

Spot speeds of vehicles observed at a point on a highway are 40, 55, 60, 65 and 80 km/h. The space-mean speed (in km/h, round off to two decimal places) of the observed vehicles is _______.

Ques 3 GATE 2021 SET-1

The longitudinal section of a runway provides the following data:

Ques 4 GATE 2021 SET-1

Traversing is carried out for a closed traverse PQRS. The internal angles at vertices P, Q, R and S are measured as 92°, 68°, 123°, and 77°, respectively. If fore bearing of line PQ is 27°, fore bearing of line RS (in degrees, in integer) is _______.

Ques 5 GATE 2021 SET-1

Getting to the top is _______ than staying on top.

Ques 6 GATE 2021 SET-1

The mirror image of the above text about the X-axis is

A

B

C

D

Ques 7 GATE 2021 SET-1

In a company, 35% of the employees drink coffee, 40% of the employees drink tea and 10% of the employees drink both tea and coffee. What % of employees drink neither tea nor coffee?

Ques 8 GATE 2021 SET-1

Ques 9 GATE 2021 SET-1

Four persons P, Q, R and S are to be seated in a row, all facing the same direction, but not necessarily in the same order. P and R cannot sit adjacent to each other. S should be seated to the right of Q. The number of distinct seating arrangements possible is:

Ques 10 GATE 2021 SET-1

Statement: Either P marries Q or X marries Y.
Among the options below, the logical NEGATION of the above statement is:

Ques 11 GATE 2021 SET-1

Consider two rectangular sheets, Sheet M and Sheet N of dimensions 6 cm × 4 cm each.
Folding operation 1: The sheet is folded into half by joining the short edges of the current shape.
Folding operation 2: The sheet is folded into half by joining the long edges of the current shape.
Folding operation 1 is carried out on Sheet M three times.
Folding operation 2 is carried out on Sheet N three times.

Ques 12 GATE 2021 SET-1

Five line segments of equal lengths, PR, PS, QS, QT and RT are used to form a star as shown in the figure above.

Ques 13 GATE 2021 SET-1

A function, λ, is defined by