ISR
ISRO Scientist Mock Test Series 2026 (Tier 1 & Tier 2)
Last updated on Oct 11, 2026
22 Total Tests
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ISRO Scientist guide
What is ISRO Scientist?
ISRO (Indian Space Research Organisation) recruits Scientist/Engineer 'SC' through its Centralised Recruitment Board (ISRO ICRB) for its space centres and units including VSSC, ISAC, URSC, SAC, NRSC, LPSC, SDSC SHAR, ISTRAC and others. Branches include Electronics, Mechanical, Computer Science, Electrical, Civil and Chemical Engineering.
An ISRO Scientist/Engineer 'SC' is a gazetted, Group A central government officer working on India's space programme β satellite design, rocket development, remote sensing, communication systems, propulsion and mission operations. ISRO has launched over 100 spacecraft and numerous launch vehicles since 1969, making it one of the world's leading space agencies.
Selection is through a two-stage process: a written test (objective, 80 questions, 300 marks, 90 minutes) focused on core engineering subjects plus General Science, Mathematics and soft skills, followed by an interview for shortlisted candidates. The interview carries significant weight in final selection β often 50-60% of the total evaluation.
ISRO Scientist/Engineer 'SC' salary starts at Pay Level 10 (βΉ56,100 basic) β the same as IAS/IPS officers β with Central Government DA and allowances. ISRO pays an additional Project Allowance at some centres and provides subsidised housing, canteen, transport, medical (CGHS) and LTC. In-hand salary is approximately βΉ75,000-βΉ90,000 per month for a new joiner.
ISRO notifications are irregular β published when vacancy requirements arise at ISRO centres. Notifications appear on the ISRO website (isro.gov.in) and ISRO ICRB. Shortlisted candidates are posted to specific ISRO centres based on merit and available vacancies. ISRO also hires through dedicated recruitment for its space science and research programmes separately.
Conducted byISRO ICRB (ISRO Centralised Recruitment Board)
PostScientist/Engineer SC (Group A, Gazetted)
EligibilityB.E./B.Tech or equivalent in relevant branch with 65% or 6.84 CGPA
Age limitUp to 35 years (general); relaxations for SC/ST/OBC/PwBD
Written test80 objective questions, 300 marks, 90 minutes
Negative markingAs per current ISRO notification β typically 1 mark per wrong in recent tests
InterviewTechnical interview for shortlisted candidates
Pay levelLevel 10 (βΉ56,100ββΉ1,77,500 basic)
In-hand salary~βΉ75,000ββΉ90,000 per month
Official websiteisro.gov.in
How it works
ISRO Scientist selection process
1
Written test
Objective CBT: 80 questions, 300 marks, 90 minutes. Tests core engineering subjects (your branch), General Science, Mathematics and soft skills (25 questions). Core subject questions: Approximately 55 questions from branch subjects. Negative marking applies β check the current notification for exact deduction. Shortlist for interview based on written test merit.
2
Technical interview
Conducted at a designated ISRO centre. Tests in-depth technical knowledge of your engineering branch, awareness of ISRO missions and space science, problem-solving ability and communication skills. The interview panel typically includes senior ISRO scientists. Final selection is heavily based on interview performance.
3
Medical examination
Standard central government medical applicable for Group A posts. Conducted at a government hospital. Checks general fitness and absence of conditions incompatible with scientific work.
β
Posting
Selected candidates are posted to specific ISRO centres (VSSC Thiruvananthapuram, URSC Bengaluru, SAC Ahmedabad, NRSC Hyderabad, SDSC SHAR Sriharikota etc.) based on merit, branch, vacancy and centre requirements.
Exam pattern
ISRO Scientist exam pattern
A written test on core branch subjects followed by an interview. The interview carries significant weight in final selection, so depth of understanding matters as much as the written score.
Syllabus
ISRO Scientist syllabus: subjects & topics
Electronics/ECE Branch
Electronic Devices & CircuitsAnalog & Digital CircuitsSignals & SystemsControl SystemsCommunicationsMicroprocessorsAntenna & Wave PropagationDigital Signal Processing
Computer Science Branch
Data Structures & AlgorithmsOperating SystemsComputer NetworksDBMSSoftware EngineeringTheory of ComputationDigital LogicProgramming (C/C++/Python)
Mechanical Engineering Branch
Engineering MechanicsStrength of MaterialsThermodynamicsFluid MechanicsHeat TransferMachine DesignManufacturing ProcessesTheory of Machines
General Aptitude & Science
Mathematics (Calculus, Linear Algebra, Probability)General ScienceCurrent Affairs (Space & Science)Analytical ReasoningEnglish Communication Skills
Strategy
How to prepare for ISRO Scientist
01ISRO interview matters as much as written β prepare both equally
Many candidates prepare only for the written test and are caught off-guard in the technical interview. ISRO interview panels ask deep technical questions on your branch subjects, ISRO missions (Chandrayaan, Mangalyaan, Gaganyaan, Aditya-L1) and space science fundamentals. Prepare a comprehensive technical interview guide alongside your written preparation.
02Follow ISRO missions and space news actively
ISRO interviews frequently ask about: recent ISRO launches, satellites in orbit (INSAT, RESOURCESAT, CARTOSAT, PSLV/GSLV/LVM missions), Gaganyaan programme, India's lunar/Mars missions, space science acronyms (VSSC, URSC, ISAC) and the role of each ISRO centre. Follow ISRO's official website and news updates.
03GATE preparation is strongly complementary
ISRO written test covers most of the same core engineering topics as GATE. Candidates who have prepared for GATE in their branch find ISRO written preparation significantly easier. If targeting ISRO, aim for GATE first and use that preparation as your ISRO written base.
04Focus on 65% qualification marks from your B.Tech
ISRO requires 65% marks or a CGPA of 6.84 in your B.E./B.Tech. This is non-negotiable β candidates below this are automatically disqualified. If you are in your final year, ensure your aggregate is on track.
05Apply as soon as notification is released
ISRO receives massive applications relative to vacancies (sometimes 1,000+ applications per seat). The notification window is typically short (2-3 weeks). Monitor isro.gov.in weekly and apply immediately when a notification is released in your branch.
FAQs
ISRO Scientist: frequently asked questions
Is there negative marking in the ISRO exam?
Yes, in recent ISRO written tests negative marking has applied for wrong answers. The exact deduction scheme (e.g., -1 for every wrong out of 4 marks, or -0.25 per mark) is specified in each individual notification. Always read the latest notification carefully.
Does ISRO use GATE scores for recruitment?
No. ISRO conducts its own centralised written test and does not use GATE scores for Scientist/Engineer SC recruitment (unlike BARC which uses GATE). However, having a good GATE score indicates you have covered the relevant core subjects thoroughly.
Can final-year students apply to ISRO?
Yes. Final-year B.E./B.Tech students are generally eligible, provided they complete the degree by the date specified in the notification. You must have at least 65% marks or equivalent CGPA through your current semesters.
What is the Scientist/Engineer SC salary at ISRO?
Pay Level 10 (βΉ56,100 basic) β same as IAS entry level. With Central Government DA + HRA + transport + project allowances, in-hand salary is approximately βΉ75,000-βΉ90,000 per month. ISRO centres provide subsidised housing, canteen, transport and CGHS medical.
What centres can I be posted to in ISRO?
Major ISRO centres: VSSC (Vikram Sarabhai Space Centre, Thiruvananthapuram) β launch vehicles, URSC/ISAC (UR Rao Satellite Centre, Bengaluru) β satellites, SAC (Space Applications Centre, Ahmedabad) β remote sensing, NRSC (National Remote Sensing Centre, Hyderabad) β earth observation, SDSC SHAR (Sriharikota) β launch facility, ISTRAC (Bengaluru) β tracking & command. Posting is based on centre requirements and merit.
How often does ISRO release recruitment notifications?
ISRO notifications are irregular β they depend on project requirements and vacancies at various centres. There is typically one major recruitment each year, but smaller notifications for specific centres or projects can appear at any time. Set up email alerts on isro.gov.in.
What engineering branches does ISRO recruit?
Main branches: Electronics/ECE, Mechanical, Computer Science, Electrical, Civil and Chemical Engineering. Branch availability varies by notification cycle based on centre requirements.
Is the ISRO Scientist job a government job?
Yes. ISRO is a government research organisation under the Department of Space (DOS), Government of India. ISRO Scientist/Engineer 'SC' is a central government Group A gazetted post with full government benefits including pension, CGHS, LTC and government accommodation.
What is the career progression at ISRO?
ISRO follows a structured Scientists' Pay Scale: Scientist/Engineer SC (Level 10) β Scientist/Engineer SD (Level 11) β Scientist/Engineer SE (Level 12) β Scientist/Engineer SG (Level 13) β Outstanding Scientist (Level 14) β Distinguished Scientist (Level 15). Progression is based on performance review, ACR and promotion board clearance.
What work does an ISRO Scientist/Engineer do?
Work depends on centre and discipline. Electronics engineers may work on satellite communication payloads, radar systems or avionics. Mechanical engineers may work on cryogenic engines, thermal systems or structural analysis. Computer scientists may work on mission operations software, onboard software or AI applications for earth observation data. The work is project-based and collaborative.
Also in Engineering
The exam pattern, eligibility and other details are based on the latest notifications available and can change from one cycle to the next. Always confirm in the official notification on isro.gov.in before you apply.
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