ISRO Interview Questions & Answers 2026
ISRO interview preparation for Scientist/Engineer SC posts and IPRC/SHAR roles covering technical and HR questions for fresher and experienced engineers.
Quick Overview — ISRO Interviews 2026
- Total questions covered: 7+ across all rounds
- Interview rounds: Written Test → Technical Interview → HR/Personality Test
- Question types: HR, Technical, Domain
- Difficulty: SC (Entry), SD, SE, SF
ISRO Interview Process
The typical ISRO interview process consists of 3 rounds. Understanding each round helps you prepare strategically.
How to Prepare for ISRO Interview
Follow this structured preparation plan to maximize your chances at ISRO.
Week 1-2: Fundamentals
Review core concepts for your role. For technical roles, practice DSA (LeetCode medium). For non-tech, review domain fundamentals and ISRO's business model.
Week 3: Company Research
Study ISRO's products, recent news, culture values, and competitors. Prepare your "Why ISRO?" answer with specific examples.
Week 4: Mock Practice
Do 3-5 mock interviews using our AI Interview Gyani tool. Practice explaining your projects and past experiences using the STAR method.
Final Days: Review & Rest
Review these 7+ questions and answers. Prepare 5-6 questions to ask the interviewer. Get proper rest the night before.
Top ISRO Interview Questions with Expert Answers
HR Questions(2 questions)
Q1. Why do you want to join ISRO?
EasyView Expert Answer
Mention ISRO's vision of using space technology for national development, scientific contributions (Chandrayaan, Mangalyaan, Gaganyaan), engineering challenges in cutting-edge domains, opportunity to work on indigenous technology, and serving the nation. Reference specific recent missions like Chandrayaan-3 success or Aditya-L1 solar mission.
Q2. What domain interests you - propulsion, avionics, structures, or thermal?
EasyView Expert Answer
Pick one based on your background. Explain interest with examples: propulsion - cryogenic engine challenges, avionics - flight computers and guidance, structures - composite materials and dynamic analysis, thermal - heat shield design for re-entry. Mention specific projects/papers studied. ISRO assigns based on this discussion.
Technical Questions(4 questions)
Q1. Explain orbital mechanics basics
HardView Expert Answer
Kepler's laws govern orbital motion: 1) elliptical orbits with central body at focus, 2) equal areas in equal times, 3) T^2 proportional to a^3. Key parameters: semi-major axis, eccentricity, inclination, RAAN, argument of perigee, true anomaly. Hohmann transfer for fuel-efficient orbit changes. Critical for ISRO mission planning.
Q2. What is the difference between PSLV and GSLV?
MediumView Expert Answer
PSLV (Polar Satellite Launch Vehicle): 4-stage, lifts up to 1750kg to SSPO, India's workhorse with 50+ successful launches. GSLV (Geosynchronous Satellite Launch Vehicle): 3-stage with cryogenic upper stage, lifts 2500kg to GTO. GSLV Mark III (now LVM3) lifts 4000kg to GTO, used for Chandrayaan-3. Different missions, different rockets.
Q3. Explain the principle of rocket propulsion
HardView Expert Answer
Newton's third law: action-reaction. Hot gases expelled at high velocity from nozzle generates equal and opposite thrust. Tsiolkovsky equation: delta-v = Isp * g * ln(m_initial/m_final). Higher specific impulse (Isp) = more efficient. Cryogenic engines (LH2/LOX) have highest Isp (~450s) but complex; solid propellants (~280s) simpler.
Q4. Explain the working of a satellite communication system
HardView Expert Answer
Components: satellite (transponder, antenna, solar panels), uplink Earth station (transmits to satellite at high frequency), downlink (satellite retransmits at lower frequency to receivers). Frequencies: C-band (4-8 GHz), Ku-band (12-18 GHz), Ka-band (26-40 GHz). Higher band = higher data rate but more rain attenuation. ISRO operates GSAT series.
Domain Questions(1 questions)
Q1. What are recent ISRO achievements?
MediumView Expert Answer
Chandrayaan-3 (Aug 2023): first soft landing near lunar south pole. Aditya-L1 (Sep 2023): first solar observatory at L1 point. XPoSat (Jan 2024): X-ray polarimetry mission. Gaganyaan: India's first crewed mission planned. Bhartiya Antariksha Station: planned by 2035. PSLV C58 mission successes. Knowledge of these is critical for ISRO interviews.
Pro Tips from Past ISRO Candidates
Use the STAR method consistently
Structure every behavioral answer as Situation → Task → Action → Result. Interviewers are trained to evaluate STAR responses.
Ask thoughtful questions at the end
Ask about ISRO's upcoming projects, team culture, or growth trajectory. Never ask about salary/benefits in the first round.
Research recent company news
Mention ISRO's recent product launches, earnings, or industry moves in your answers. It shows genuine interest.
Prepare your 'Why this company?' answer
Don't give generic answers. Be specific: 'I admire ISRO's [specific project/initiative] because...' with personal connection.
Follow up with a thank-you email
Send a brief, personalized thank-you within 24 hours referencing specific discussion points. It sets you apart from 90% of candidates.
Common Mistakes to Avoid
Practice These Questions with AI
Get instant feedback on your answers with our AI-powered mock interview tool. Practice ISRO interview questions with real-time evaluation and scoring. Used by 50K+ candidates.
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