GATE 2021 Environmental Science (ES) Answer Key With Question Paper – Get Here

GATE 2021 Environmental Science (ES) Answer Key – Candidates can get the GATE Environmental Science answer key 2021 from this article. Using the answer key and the marking scheme candidates can calculate their probable score in the exam. Get complete details on GATE 2021 Environmental Science (ES) answer key here.

GATE 2021 Environmental Science (ES) Answer Key

  • Exam Date –  February 07, 2021
  • Time – 03:00 PM to 06:00 PM
  • Subject Paper –  Environmental Science (ES)
  • GATE 2021 Result Date: 22 March 2021

If you appeared for GATE 2021 ES paper, then submit your questions and we will provide you the answer key. Click on the button below to submit answers. All the best!

Check GATE 2021 ES memory based questions and answers below:

Q: Ionic strength related question

Q: Question based on sodium absorption ratio

Q: In noise pollution ans was 20 log(Prms/p0)

Q: Based on solubility question

Q: In Maths 2 question from limit

Q: When Chlorine will be effective. Options – Ph8, 12, 9 & 6

Q: Which among are primary pollutants – Co, So2, No2. Ozone

Q: Based on alkanity question

Q: Reduce, Reuse, Recycle, Energy Recovery

Q: p/q+q/p = 3, p2/q2+q2/p2 =?
Ans: 7

Q: Type 1 settling sedimentation tank

Q: Setting in Plain Sedimentation Tank – Options – Gravitational, Impaction, Interception
Ans: Gravitational

Q: O3 is not the primary pollutant

Q: Conc>30 Degree

Q: Ph = 6, where Cl2 most effective

Q: There were questions based on Kyoto Protocol, Basel Convention, Stockholm Convention

Q: There was a question based on Sodium Absorption Ratio

Q: There was a MPN related MSQ

Q: There was a question based on Microgram/m3 to ppmv

Q: F/M = 31

Q: Ph=2 for 10 mg per lit conc

You can also check: GATE answer keys for all 27 papers

GATE 2021 Environmental Science (ES) Answer Key Dates

The GATE Environmental Science answer key is expected to release a few days after the exam. Check all the important dates for the GATE 2021 exam from the table below.

EventsImportant Dates
GATE 2021 Exam Date06, 07, 13 and 14, Feb 2021
GATE 2021 Result Declaration22 Mar 2021
Last date to download GATE 2021 Scorecard31 May 2021

How to Calculate Score For GATE 2021 Exam?

Once the GATE answer key is available, candidates can calculate the scores for the exam. Check out the brief steps on how to calculate the GATE 2021 Scores below.

1st step: The foremost step is to get the answer key, response sheet and question paper from the website.

2nd step: Secondly, note down the correct and incorrect answers by comparing response sheet and answer key.

3rd step: At the end, add and deduct the marks as per the marking scheme. Also, refer to the formula available below.

GATE Scores = (No. of correct question x marks for correct answer) – (no. of incorrect questions x negative marking)

GATE Marking Scheme

QuestionsCorrect Answer MarksNegative Marking
Multiple Choice Questions (MCQ) and
Multiple Select Questions (MSQ)
+1 or +2 marks-1/3 for -1 mark question
-2/3 for -2 mark question
Numerical Answer Type (NAT)+1 or +2 marksNo Negative Marking

GATE Environmental Science (ES) Paper Cut Off

Candidates can compare their scores and cut-off marks to know the tentative nature of the selection. IIT Bombay publishes GATE 2021 Cut-off marks with the result. The final cut-off marks depend on various factors. The cut-ff marks are derived depending on the number of candidates appearing difficulty level, the performance of applicants and others.

GATE 2021 Question Paper

Aspirants can download the respective subject code GATE 2021 question paper from They need the GATE enrollment number and the password to log in and access the link. With the question paper, candidates will also get the direct link to download the GATE response sheet.

GATE 2021 Official Environmental Science (ES) Answer Key

The official answer key for GATE 2021 Environmental Science releases online at Candidates participating this year can download it from the website through login. So, they must keep the enrollment number and password to download GATE 2021 Official Environmental Science answer key. With the official answer key, applicants can also check the correct and authentic answer of GATE 2021 questions.

How to Download GATE 2021 Official ES Answer Key?

Refer to the steps below to know how to download the GATE 2021 Official answer key from the website.

1st step: The first step is to search the GATE 2021 official website,

2nd step: Hereafter, on reaching the official website homepage, click on GATE answer key button.

3rd step: In the next screen, enter the GATE enrollment number and password to login.  

4th step: Lastly, tap on the download button to get the GATE official answer key.

GATE 2021 Result

After the official answer key is out, IIT Bombay declares GATE 2021 result. Candidates have to visit the official website to access the GATE result, As the result releases in login, keep the enrolment number and password beforehand. Moreover, the result is out in the scorecard format with the names of qualifying candidates and their scores. The GATE result 2021 is prepared based on the final answer key for the examination.

About GATE 2021

The examinations for the Graduate Aptitude Test in Engineering (GATE) Exam takes place every year. It is conducted by the Indian Institute of Technology Bombay (IIT B). Earlier, GATE exam was organized by the IISc Bangalore and seven IITs. Aspirants can use the GATE scores to take participate in the PGU recruitment through GATE. They can also use to take admission in Master’s and PhD programs.


Q1. Is there negative marking in GATE exam?

Ans 1. Yes. 1/3rd marks allocated to each questions are deducted for every incorrect answer.

Q2. What is the official website to download GATE answer key?

Ans 2. Candidates can download GATE answer key from

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