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GATE 2023 ES question paper with official answer key

The complete GATE 2023 Environmental Science and Engineering (ES) paper: 65 questions for 100 marks, with the official answer to every question. Try each question first, then open its answer, or practise the whole paper free with a 3-hour timer and your score.

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GATE 2023 ES paper at a glance

Questions
65
Total marks
100
General Aptitude
10 questions · 15 marks
ES subject
55 questions · 85 marks
Question types
37 MCQ · 3 MSQ · 25 NAT
Duration
3 hours

In GATE, each MCQ carries 1 or 2 marks; a wrong MCQ answer costs one-third of its marks (−1/3 for a 1-mark and −2/3 for a 2-mark question). MSQ (multiple select) and NAT (numerical answer) questions have no negative marking.

All 65 questions

Each question is shown exactly as in the official paper. Tap “Show answer” to check yourself.

Q.1 · General Aptitude · 1 mark · MCQ

GATE 2023 ES question 1
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Answer: D

Q.2 · General Aptitude · 1 mark · MCQ

GATE 2023 ES question 2
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Answer: B

Q.3 · General Aptitude · 1 mark · MCQ

GATE 2023 ES question 3
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Answer: A

Q.4 · General Aptitude · 1 mark · MCQ

GATE 2023 ES question 4
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Answer: B

Q.5 · General Aptitude · 1 mark · MCQ

GATE 2023 ES question 5
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Answer: C

Q.6 · General Aptitude · 2 marks · MCQ

GATE 2023 ES question 6
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Answer: D

Q.7 · General Aptitude · 2 marks · MCQ

GATE 2023 ES question 7
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Answer: B

Q.8 · General Aptitude · 2 marks · MCQ

GATE 2023 ES question 8
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Answer: D

Q.9 · General Aptitude · 2 marks · MCQ

GATE 2023 ES question 9
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Answer: A

Q.10 · General Aptitude · 2 marks · MCQ

GATE 2023 ES question 10
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Answer: B

Q.11 · ES · 1 mark · MCQ

GATE 2023 ES question 11
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Answer: B

Q.12 · ES · 1 mark · MCQ

GATE 2023 ES question 12
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Answer: A

Q.13 · ES · 1 mark · MCQ

GATE 2023 ES question 13
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Answer: D

Q.14 · ES · 1 mark · MCQ

GATE 2023 ES question 14
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Answer: B

Q.15 · ES · 1 mark · MCQ

GATE 2023 ES question 15
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Answer: A

Q.16 · ES · 1 mark · MCQ

GATE 2023 ES question 16
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Answer: A

Q.17 · ES · 1 mark · MCQ

GATE 2023 ES question 17
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Answer: A

Q.18 · ES · 1 mark · MCQ

GATE 2023 ES question 18
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Answer: A

Q.19 · ES · 1 mark · MCQ

GATE 2023 ES question 19
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Answer: C

Q.20 · ES · 1 mark · MCQ

GATE 2023 ES question 20
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Answer: B

Q.21 · ES · 1 mark · MCQ

GATE 2023 ES question 21
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Answer: A

Q.22 · ES · 1 mark · MCQ

GATE 2023 ES question 22
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Answer: A

Q.23 · ES · 1 mark · MCQ

GATE 2023 ES question 23
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Answer: A

Q.24 · ES · 1 mark · MCQ

GATE 2023 ES question 24
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Answer: A

Q.25 · ES · 1 mark · MCQ

GATE 2023 ES question 25
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Answer: B

Q.26 · ES · 1 mark · MCQ

GATE 2023 ES question 26
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Answer: B

Q.27 · ES · 1 mark · MCQ

GATE 2023 ES question 27
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Answer: C

Q.28 · ES · 1 mark · MCQ

GATE 2023 ES question 28
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Answer: D

Q.29 · ES · 1 mark · MCQ

GATE 2023 ES question 29
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Answer: D

Q.30 · ES · 1 mark · NAT

GATE 2023 ES question 30
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Answer: 0.06 to 0.066

Q.31 · ES · 1 mark · NAT

GATE 2023 ES question 31
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Answer: 1.35 to 1.4

Q.32 · ES · 1 mark · NAT

GATE 2023 ES question 32
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Answer: 0.65 to 0.75

Q.33 · ES · 1 mark · NAT

GATE 2023 ES question 33
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Answer: 1

Q.34 · ES · 1 mark · NAT

GATE 2023 ES question 34
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Answer: 220 to 225

Q.35 · ES · 1 mark · NAT

GATE 2023 ES question 35
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Answer: 24 to 26

Q.36 · ES · 2 marks · MCQ

GATE 2023 ES question 36
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Answer: A

Q.37 · ES · 2 marks · MCQ

GATE 2023 ES question 37
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Answer: D

Q.38 · ES · 2 marks · MCQ

GATE 2023 ES question 38
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Answer: D

Q.39 · ES · 2 marks · MCQ

GATE 2023 ES question 39
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Answer: A

Q.40 · ES · 2 marks · MCQ

GATE 2023 ES question 40
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Answer: D

Q.41 · ES · 2 marks · MCQ

GATE 2023 ES question 41
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Answer: A

Q.42 · ES · 2 marks · MCQ

GATE 2023 ES question 42
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Answer: B

Q.43 · ES · 2 marks · MCQ

GATE 2023 ES question 43
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Answer: C

Q.44 · ES · 2 marks · MSQ

GATE 2023 ES question 44
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Answer: C

Q.45 · ES · 2 marks · MSQ

GATE 2023 ES question 45
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Answer: A, B

Q.46 · ES · 2 marks · MSQ

GATE 2023 ES question 46
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Answer: A, B, D

Q.47 · ES · 2 marks · NAT

GATE 2023 ES question 47
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Answer: 7.7 to 7.8

Q.48 · ES · 2 marks · NAT

GATE 2023 ES question 48
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Answer: 50

Q.49 · ES · 2 marks · NAT

GATE 2023 ES question 49
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Answer: 1.9 to 2.1

Q.50 · ES · 2 marks · NAT

GATE 2023 ES question 50
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Answer: 9.1 to 9.7

Q.51 · ES · 2 marks · NAT

GATE 2023 ES question 51
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Answer: 20 to 22

Q.52 · ES · 2 marks · NAT

GATE 2023 ES question 52
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Answer: 1 to 1.2

Q.53 · ES · 2 marks · NAT

GATE 2023 ES question 53
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Answer: 162 to 166

Q.54 · ES · 2 marks · NAT

GATE 2023 ES question 54
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Answer: 1 to 1.15

Q.55 · ES · 2 marks · NAT

GATE 2023 ES question 55
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Answer: 0.4 to 0.44

Q.56 · ES · 2 marks · NAT

GATE 2023 ES question 56
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Answer: 0.23 to 0.245

Q.57 · ES · 2 marks · NAT

GATE 2023 ES question 57
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Answer: 1.9 to 2.2

Q.58 · ES · 2 marks · NAT

GATE 2023 ES question 58
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Answer: 54.4 to 54.8

Q.59 · ES · 2 marks · NAT

GATE 2023 ES question 59
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Answer: 95 to 100

Q.60 · ES · 2 marks · NAT

GATE 2023 ES question 60
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Answer: 165 to 168

Q.61 · ES · 2 marks · NAT

GATE 2023 ES question 61
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Answer: 1.75 to 1.95

Q.62 · ES · 2 marks · NAT

GATE 2023 ES question 62
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Answer: 19300 to 19400

Q.63 · ES · 2 marks · NAT

GATE 2023 ES question 63
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Answer: 1.7 to 1.8

Q.64 · ES · 2 marks · NAT

GATE 2023 ES question 64
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Answer: 0.022 to 0.024

Q.65 · ES · 2 marks · NAT

GATE 2023 ES question 65
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Answer: 7.1 to 7.3

GATE 2023 ES official answer key

From the official GATE answer key ↗. Numerical answers are accepted anywhere in the range shown.

Q.SectionTypeMarksAnswer
1GAMCQ1D
2GAMCQ1B
3GAMCQ1A
4GAMCQ1B
5GAMCQ1C
6GAMCQ2D
7GAMCQ2B
8GAMCQ2D
9GAMCQ2A
10GAMCQ2B
11ESMCQ1B
12ESMCQ1A
13ESMCQ1D
14ESMCQ1B
15ESMCQ1A
16ESMCQ1A
17ESMCQ1A
18ESMCQ1A
19ESMCQ1C
20ESMCQ1B
21ESMCQ1A
22ESMCQ1A
23ESMCQ1A
24ESMCQ1A
25ESMCQ1B
26ESMCQ1B
27ESMCQ1C
28ESMCQ1D
29ESMCQ1D
30ESNAT10.06 to 0.066
31ESNAT11.35 to 1.4
32ESNAT10.65 to 0.75
33ESNAT11
34ESNAT1220 to 225
35ESNAT124 to 26
36ESMCQ2A
37ESMCQ2D
38ESMCQ2D
39ESMCQ2A
40ESMCQ2D
41ESMCQ2A
42ESMCQ2B
43ESMCQ2C
44ESMSQ2C
45ESMSQ2A, B
46ESMSQ2A, B, D
47ESNAT27.7 to 7.8
48ESNAT250
49ESNAT21.9 to 2.1
50ESNAT29.1 to 9.7
51ESNAT220 to 22
52ESNAT21 to 1.2
53ESNAT2162 to 166
54ESNAT21 to 1.15
55ESNAT20.4 to 0.44
56ESNAT20.23 to 0.245
57ESNAT21.9 to 2.2
58ESNAT254.4 to 54.8
59ESNAT295 to 100
60ESNAT2165 to 168
61ESNAT21.75 to 1.95
62ESNAT219300 to 19400
63ESNAT21.7 to 1.8
64ESNAT20.022 to 0.024
65ESNAT27.1 to 7.3

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