Civil Engineering Gate Yearwise 

Civil Engineering GATE 2023 Set-1 Questions with Answer

Ques 14 Environmental Engineering

The composition and energy content of a representative solid waste sample are given in the table. If the moisture content of the waste is 26%, the energy content of the solid waste on a dry-weight basis is _______ MJ/kg (round off to one decimal place).


a is the correct answer.


Ques 15 Environmental Engineering

A flocculator tank has a volume of 2800 m3. The temperature of water in the tank is 15°C and the average velocity gradient maintained in the tank is 100/s. The temperature of water is reduced to 5°C. but all other operating conditions including the power input are maintained as the same. The decrease in the average velocity gradient (in %) due to the reduction in water temperature is _______ (round off to nearest integer).
[Consider dynamic viscosity of water at 15°C and 5°C as 1.139x10-3 N-s/m2 and 1.518x10-3 N-s/m2, respectively]


a is the correct answer.


Ques 16 Environmental Engineering

The wastewater inflow to an activated sludge plant is 0.5 m3/s, and the plant is to be operated with a food to microorganism ratio of 0.2 mg/mg-d. The concentration of influent biodegradable organic matter of the wastewater to the plant (after primary settling) is 150 mg/L, and the mixed liquor volatile suspended solids concentration to be maintained in the plant is 2000 mg/L. Assuming complete removal of biodegradable organic matter in the tank, the volume of aeration tank (in m3, in integer) required for the plant is _______.


a is the correct answer.


Ques 17 Fluid Mechanics

A jet of water having a velocity of 20 m/s strikes a series of plates fixed radially on a wheel revolving in the same direction as the jet at 15 m/s. What is the percentage efficiency of the plates? (round off to one decimal place)

(A) 37.5
(B) 66.7
(C) 50.0
(D) 88.9

A

37.5

B

66.7

C

50.0

D

88.9



Ques 18 Fluid Mechanics

A hydraulic jump occurs in a 1.0 m wide horizontal, frictionless, rectangular channel, with a pre-jump depth of 0.2 m and a post-jump depth of 1.0 m. The value of g may be taken as 10 m/s2. The values of the specific force at the pre-jump and post-jump sections are the same and are equal to _______ (in m3, rounded off to two decimal places).


a is the correct answer.


Ques 19 General Aptitude

"I have not yet decided what I will do this evening; I _______ visit a friend."

A

mite

B

would

C

might

D

didn't



Ques 20 General Aptitude

Eject: Insert:: Advance: _______
(By word meaning)

A

Advent

B

Progress

C

Retreat

D

Loan



Ques 21 General Aptitude

In the given figure, PQRSTV is a regular hexagon with each side of length 5 cm. A circle is drawn with its centre at V such that it passes through P. What is the area (in cm2) of the shaded region? (The diagram is representative)

A

25π⁄3

B

20π⁄3

C

6π

D

7π



Ques 22 General Aptitude

A duck named Donald Duck says "All ducks always lie."
Based only on the information above, which one of the following statements can be logically inferred with certainty?

A

Donald Duck always lies.

B

Donald Duck always tells the truth.

C

Donald Duck's statement is true.

D

Donald Duck's statement is false.



Ques 23 General Aptitude

A line of symmetry is defined as a line that divides a figure into two parts in a way such that each part is a mirror image of the other part about that line.
The figure below consists of 20 unit squares arranged as shown. In addition to the given black squares, upto 5 more may be coloured black. Which one among the following options depicts the minimum number of boxes that must be coloured black to achieve two lines of symmetry? (The figure is representative)

A

c, d, i

B

c, d, i, f, g

C

c, i

D

d



Ques 24 General Aptitude

Based only on the truth of the statement 'Some humans are intelligent', which one of the following options can be logically inferred with certainty?

A

No human is intelligent.

B

All humans are intelligent.

C

Some non-humans are intelligent.

D

Some intelligent beings are humans.



Ques 25 General Aptitude

Which one of the options can be inferred about the mean, median, and mode for the given probability distribution (i.e. probability mass function), P(x), of a variable x?

A

mean = median ≠ mode

B

mean = median = mode

C

mean ≠ median = mode

D

mean ≠ mode = median



Ques 26 General Aptitude

The James Webb telescope, recently launched in space, is giving humankind unprecedented access to the depths of time by imaging very old stars formed almost 13 billion years ago. Astrophysicists and cosmologists believe that this odyssey in space may even shed light on the existence of dark matter. Dark matter is supposed to interact only via the gravitational interaction and not through the electromagnetic-, the weak- or the strong-interaction. This may justify the epithet "dark" in dark matter.
Based on the above paragraph, which one of the following statements is FALSE?

A

No other telescope has captured images of stars older than those captured by the James Webb telescope.

B

People other than astrophysicists and cosmologists may also believe in the existence of dark matter.

C

The James Webb telescope could be of use in the research on dark matter.

D

If dark matter was known to interact via the strong-interaction, then the epithet "dark" would be justified.



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