Indian Space Research Organisation (ISRO) has officially released the ISRO Scientist/Engineer Answer Key 2025 for candidates who appeared in the recruitment examination held in October 2025. This long-awaited release brings immense relief and excitement to thousands of aspirants who dream of working with India’s prestigious space agency.The answer key is now available on ISRO’s official website, enabling candidates to check their responses, estimate their probable scores, and prepare for the next phase of selection. In this comprehensive guide, we will walk you through everything you need to know — from how to download the answer key, how to raise objections, expected cut-offs, and key details about the ISRO Scientist/Engineer recruitment process.
Overview of ISRO Scientist/Engineer Recruitment 2025
The ISRO Scientist/Engineer recruitment is one of the most sought-after engineering exams in India. Every year, ISRO conducts examinations for various engineering disciplines to recruit talented engineers for its research and development projects.
Here’s a quick overview of the 2025 recruitment drive:
- Organization Name: Indian Space Research Organisation (ISRO)
- Post Name: Scientist/Engineer ‘SC’
- Departments: Electronics, Mechanical, and Computer Science
- Exam Conducted By: ISRO Centralised Recruitment Board (ICRB)
- Exam Date: 26 October 2025
- Answer Key Release Date: November 2025
- Mode of Exam: Offline (OMR-based)
- Official Website: www.isro.gov.in
The exam aimed to fill a significant number of vacancies for various ISRO centres across India, providing candidates a golden opportunity to contribute to the nation’s space missions.
ISRO Scientist/Engineer Answer Key 2025: Latest Update
ISRO has released the provisional answer key for the Scientist/Engineer written examination. This key allows candidates to verify their answers and calculate their expected scores before the results are officially announced.The answer key includes question-wise correct answers for all disciplines — Mechanical, Electronics, and Computer Science. It is available in a downloadable PDF format for each branch.Candidates can also submit objections if they find any discrepancy in the provisional answer key within the stipulated time period announced by ISRO.
Importance of the ISRO Answer Key 2025
The release of the answer key serves multiple important purposes for candidates:
- Transparency: The answer key ensures complete transparency in the evaluation process.
- Self-Evaluation: Candidates can analyze their performance and predict their chances of qualifying for the next stage.
- Score Estimation: It helps in calculating approximate marks before the result is declared.
- Error Rectification: If any errors are found, candidates can challenge the answer key and request corrections.
- Confidence Building: Checking answers against the key allows candidates to understand their strengths and weaknesses for future exams.
How to Download ISRO Scientist/Engineer Answer Key 2025
Downloading the answer key is a simple and straightforward process. Follow the steps below carefully:
- Visit the official ISRO website (www.isro.gov.in).
- Go to the “Careers” or “ICRB Recruitment” section on the homepage.
- Look for the notification titled “Scientist/Engineer Answer Key 2025”.
- Select your respective branch/discipline — Electronics, Mechanical, or Computer Science.
- Click on the download link to open the PDF file.
- Save the answer key on your device and print it for easy reference.
After downloading the answer key, candidates should also compare their answers with the official ones to calculate their tentative score.
How to Calculate Your Score Using the Answer Key
To estimate your score accurately, you must be aware of the marking scheme followed by ISRO for the Scientist/Engineer exam.
Here’s how you can calculate it:
- Each correct answer: +3 marks
- Each wrong answer: −1 mark (negative marking)
- Unanswered question: 0 marks
Formula to Calculate Expected Score:
(Number of Correct Answers × 3) − (Number of Incorrect Answers × 1)
By using this formula, you can determine your total marks and compare them with the previous year’s expected cut-off to assess your performance.
Raising Objections Against the Provisional Answer Key
If you find any question in the provisional key that appears incorrect, ISRO allows you to challenge or raise objections within a specific period.
Here are the key points to note:
- Mode of Objection: Online through ISRO’s official recruitment portal.
- Time Limit: Candidates usually have 3–5 days after the release of the provisional key to raise objections.
- Evidence Required: Provide valid proof, such as standard textbooks or research papers, to support your objection.
- Objection Fee: A nominal fee (refundable if the challenge is accepted) may be charged per question.
- Final Answer Key: After reviewing objections, ISRO releases the final answer key, which will be used for result evaluation.
It is strongly advised that candidates review the provisional answer key thoroughly before submitting objections to ensure accuracy and proper justification.
ISRO Scientist/Engineer Cut-Off 2025 (Expected)
Although the official cut-off marks will be announced later, candidates can analyze previous years’ trends to get a rough idea of what to expect this year.
Here are the expected cut-off marks (category-wise) based on analysis and exam difficulty:
| Branch | General | OBC | SC | ST | EWS |
|---|---|---|---|---|---|
| Electronics | 165–175 | 155–165 | 140–150 | 130–140 | 155–165 |
| Mechanical | 170–180 | 160–170 | 145–155 | 135–145 | 160–170 |
| Computer Science | 160–170 | 150–160 | 135–145 | 125–135 | 150–160 |
These numbers are indicative and may vary depending on factors such as exam difficulty, number of candidates, and vacancies.
ISRO Scientist/Engineer Selection Process
The ISRO Scientist/Engineer recruitment process involves the following stages:
- Written Test: Objective-type exam to assess technical knowledge and problem-solving ability.
- Interview: Candidates shortlisted based on written test performance are invited for a personal interview.
- Final Merit List: Prepared based on combined scores of written exam and interview.
- Document Verification: Final stage to verify educational qualifications and eligibility criteria.
The written test carries high weightage, and thus, analyzing the answer key accurately is essential to predict your chances of selection.
What Happens After the Answer Key Release
After the release of the provisional answer key, ISRO follows these steps:
- Objection Window: Candidates raise objections (if any) within the given time.
- Review of Objections: ISRO experts analyze and verify the objections submitted.
- Final Answer Key: A revised version is released after necessary corrections.
- Result Declaration: Based on the final answer key, results are compiled and published on the ISRO website.
- Interview Call: Qualified candidates are called for the interview round.
Tips for Candidates After Answer Key Release
While waiting for the results, candidates can use this time productively:
- Analyze Mistakes: Identify topics or concepts where you went wrong.
- Prepare for Interviews: Start brushing up on fundamentals, projects, and ISRO-related developments.
- Stay Updated: Regularly check ISRO’s official website for result announcements.
- Document Readiness: Keep your certificates and identity proofs ready for verification.
- Backup Planning: Explore other government or PSU exams with similar eligibility to stay prepared.
Common Mistakes to Avoid While Checking the Answer Key
Many candidates make simple yet critical mistakes while analyzing the answer key. Avoid the following errors:
- Forgetting to account for negative marking.
- Comparing the wrong set of questions or discipline-wise answer key.
- Ignoring updated notifications about corrections or revised answer keys.
- Submitting objections without credible proof.
- Depending on unofficial answer keys from unreliable sources.
Always rely on the official ISRO website for accurate and verified information.
When Will ISRO Scientist/Engineer Result 2025 Be Announced?
The final result is expected a few weeks after the release of the final answer key. Typically, ISRO declares results 3–4 weeks after closing the objection window.Once declared, candidates can check their results and download the scorecard by logging into the ISRO recruitment portal using their credentials.
Important Links – ISRO Scientist/Engineer Answer Key 2025
For your convenience, here are all the important official links related to the ISRO Scientist/Engineer Recruitment 2025. Candidates are advised to visit only the official ISRO website and verified portals for updates, downloads, and notifications.
| Description | Links |
|---|---|
| Answer Key (Released on 04-11-2025) | Click Here |
| Apply Online | Click Here |
| Notification | Click Here |
| Official Website | Click Here |
Frequently Asked Questions
When was the ISRO Scientist/Engineer exam conducted?
The exam was conducted on 26 October 2025 across multiple centres in India.
When was the ISRO Scientist/Engineer Answer Key 2025 released?
The provisional answer key was released in November 2025 on the official ISRO website.
Can I raise objections to the answer key?
Yes, candidates can raise objections within the given time frame by submitting valid proof through the official portal.
What is the marking scheme for ISRO Scientist/Engineer exam?
Candidates receive +3 marks for each correct answer and −1 mark for every incorrect answer.
When will the final result be declared?
The result is expected to be announced shortly after the publication of the final answer key, tentatively by late November or December 2025.
Conclusion
ISRO Scientist/Engineer Answer Key 2025 marks a crucial stage in the recruitment process, giving candidates an opportunity to evaluate their performance and predict their selection chances. By following the official procedure, downloading the answer key, and analyzing it carefully, aspirants can make informed decisions about the next steps.Keep an eye on ISRO’s official website for updates regarding the final answer key, result declaration, and interview schedule. For all the passionate engineers aiming to join India’s leading space agency, this is the moment to stay positive, proactive, and prepared.
