Hello, welcome to repells.com here in this post we will cover ISRO CSE Interview questions and also share ISRO CSE Interview experience.Hope this will help/guide you for you next ISRO Interview.Before going directly into Interview questions we will see some pre-ISRO exam things.
ABOUT ISRO RECRUITMENT 2024
The Indian Space Research Organization, commonly abbreviated as ISRO, is engaged in research and development for the development of space science, technology and applications. ISRO 2024 recruitment taken place for various streams from BE/B. Technologies such as electronics, mechanics, computer science and electronics Autonomous bodies.
Recruitment: Indian Space Research Organization Recruitment Board conducts annual recruitment audits to recruit scientists/engineers based on vacancies. Other major positions are also filled based on the candidate’s performance in the selection test.
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Different Space Centres and other Departments
- Vikram Sarabhai Space Centre (VSSC)
- Liquid Propulsion Systems Centre (LPSC)
- Satish Dhawan Space Centre (SDSC) SHAR
- ISRO Satellite Centre (ISAC)
- ISRO Propulsion Complex (IPRC)
- Space Applications Centre (SAC)
- National Remote Sensing Centre (NRSC)
- Development and Educational Communication Unit (DECU)
- Indian Institute of Remote Sensing (IIRS)
- Master Control Facility (MCF)
- Department of Space and ISRO HQ
- Antrix Corporation Limited
- ISRO Telemetry, Tracking and Command Network (ISTRAC)
- ISRO Inertial Systems Unit (IISU)
- Laboratory for Electro-Optics Systems (LEOS)
ISRO EXAM PATTERN(SCIENTIST/ENGINEER)
| Type of Questions | Objective type |
| Medium | English |
| Total questions | 80 |
| Mode | Offline |
| Duration | 90 Minutes |
| Total Marks | 240 |
| Marking Scheme | 3 marks for each question |
| Negative Marking | -1 for wrong answers |
NOTE:FOR PREPARING ,GATE SYLLABUS IS ENOUGH
Now as we have discussed enough about ISRO recruitment and ISRO Exam pattern we will move ahead and share ISRO INTERVIEW QUESTIONS and some important ISRO INTERVIEW EXPERIENCE
ISRO CSE Interview Experience
EXCERPTS FROM STUDENT 1
Interview Experience :
Date of interview- 10th – March -2021
Venue- NRSC Guest House Conference Hall, Balanagar, Hyderabad.
Time- 8:30 AM.
In the big reception hall, everyone was asked to sit and wait for their turn. At appx. 8:30 AM, they verified the documents and covid report. Document verification was done. At 8:45 am they called me inside of another waiting room. I was waiting outside of interview hall.
My interview was started at approx 9:00 am :
As I entered the room there was a big table with big screen, and panel head (PH) was on the screen. then panel head asked me to sit.
ISRO CSE Interview Questions
PH : (smiling) Devendhar right….?
Me : Yes sir
PH: You from Hyderabad (Telangana) ?
Me: Yes sir
PH: How are you? and is everything fine ?
Me : Im fine sir, thank you.
PH: How is the covid situation in your town?
Me: Now situtation is improving in my town sir and day by day becoming normal.
PH: I hope you and your family is safe ?
Me: yes sir, thank you.
PH: okay. Tell me about your academic background ?
Me: Introduced myself.
PH: Which programming languages you are comfortable?
Me: C, Java
PH: What is OOPs?
Me: Answered
PH: What is Polymorphism ?
Me: Answered
PH: What is overloading and overriding ?
Me: Answered (but could not defined in proper way)
Then he asked one of the panel members to continue…
P1 : what are your favourite subjects ?
Me: Data structures, Algorithms, Database and management system, Operating system.
P1: What are the functions of OS?
Me: Answered
P1: What are IPC Mechanisms?
Me: Answered (I mentioned only few)
P1: Any other IPC mechanisms than what you told ?
Me: Answered
P1: What are various process states ?
P1: What is pre-emption?
P1: What are synchronization mechanisms ?
I answered all of them, then he moved to C
P1: What is Declaration and Definition of a variable? difference between them ?
P1: What is Postfix and Prefix?
P1: What is Structure and Union? Difference ?
I answered all of them, then he moved to Computer Networks
P1: LAN vs WAN ?
P1: What is Ethernet ?
P1: What is CSMA/CD and explain in detail?
P1: What is firewall and Why we use it?
P1: What is Denial of service attack ?
I answered and all of them, then he moved to Software Engineering
P1: What is SDLC and what are the phases ?
Me: I gave definition, bt he asked me explanation of each phase. Then I explained the each phase.
P1: What is whitebox testing and blackbox testing ?
Me: First, I gave definitions bt bt he asked me to explain. I explained.
Then he asked one of the panel members to continue…
P2: Are you comfortable with compiler ?
Me: yes ma’am (with doubtful face bcz I didnt mentioned in fav subjects)
P2: Why compiler ?
P2: What are the steps in designing the compiler?
P2: What is interpreter and compiler? differences?
Me: Answered all
P2: Is compiler platform dependent ?
Me: I said yes
P2: If I compiled one program in one machine and can I run it on another machine or Do I need to compile again?
Me: Yes ma’am, need to compile again
P2: are you sure ?
Me: Yes ma’am
P2: really ??
Me: We can use cross compiler also ma’am.
P2: Ok… I’m done with you.
Then Panel head asked one of the panel members to continue…
P3: you did project in Deep learning right ??
Me: Yes, ma’am
P3: What is neural networks ?
P3: What are different types of neural network connections ?
P3: Different types of learning algorithms?
P3: Which one is used in your project ?
P3: What is the benifit of Reinforcement learning ?
P3: What is Activation function ?
I answered all of them
P3: How you say it converges and when you stop ?
Me: answered (but could not explain in proper way)
Then the Panel head said that we are done with your interview and asked me to leave.
My interview lasted for around 30 – 35 minutes.
ISRO CSE Interview Experience
EXCERPTS FROM STUDENT 2
The interview process of ISRO was online this time.
I was asked to introduce myself and asked to tell my work exp , educational background and favorite subject. I introduced and told my favorite subject as OS,TOC,DS,Algo,COA. My preferred programming language was asked and i told Python and C.
I am not remembering the proper order of questions , and might have missed some questions also. Please dont mind it.I was told first TOC would be asked.
ISRO CSE Interview Questions
TOC ISRO INTERVIEW QUESTIONS
1) What is language
I was stuck for one second. But explained “A language is a subset of sigma star”.
2)What is Sigma
Answered.
3)Define DFA
Explained the five tuple form.
4) If NFA and Epsilon NFA exist , why go for DFA.?
I told NFA and Epsilon NFA is easier to construct than DFA. Also we have algorithm to convert NFA to DFA.
5)What is recursive language?
Expalined it using Total Turing Machine concept. I guess this was a game changer. I thank Kiran Kumar Pasupuleti sir for the teaching the TTM concept.
6)What is recursive enumerable language?
Answered.
7)What is NP hard?
Answered
8)What is NP Complete?
Answered.
9)What is halting problem of Turing Machine?
Answered.
10)What is decidable language?
Answered.
11) What is A^n B^n C^n?
I told it is CSG. But he was expecting the machine which accept it. I told its LBA.
DS ISRO INTERVIEW QUESTIONS
12)What is tree?
An acyclic graph which is connected.
13)What is forest?
Answered.
14)How to make a stack using queue?
Answered
15)What is Binary Search tree?
16)What is AVL Tree?
17)What is threaded binary tree?.
I said i dont know about it.
OS ISRO INTERVIEW QUESTIONS
18)Paging vs Segmentation?
19)What is Disk Scheduling algo?
I explained the FCFS, SSTF,SCAN, Elevator.
20)How can we avoid starvation.
I replied “increasing the priority of process”.
ALGORITHM ISRO INTERVIEW QUESTIONS
22)Give example of Divide and Conquer, Greedy and Dynamic Programming algorithm
23)What is difference between Divide and Conquer , Dyamic Programming
25)What is inplace sorting algorithm and Not inplace sorting algorithm.
C PROGRAMMING ISRO INTERVIEW QUESTIONS
26)What is macros
27)What is inline function
COA ISRO INTERVIEW QUESTIONS
28)What is pipelining?
29)What are hazards
30)What is locality of reference?
31)What is write back cache?
32)What is write through cache?
CN ISRO INTERVIEW QUESTIONS
33)What are the layers of ISO/OSI?
34)Compare TCP and UDP?
35)In which port HTTP runs.
36)Example of UDP using Application layer protocol.
MACHINE LEARNING ISRO INTERVIEW QUESTIONS 
37)What is Machine learning vs deep learning.
Expalined that ML need hand crafted features but DL extract features automatically. Explained some DL and ML algorithms
38)What is underfitting and overfitting.
39)What is k-crossfold validation
40)What is corelation vs covariance
(I replied i dont remember sir)
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S/w Engg ISRO INTERVIEW QUESTIONS
41)Different stages of SDLC.
(Told me to just name them only)
42)What are different examples of testing.
43)What is regression testing
44)Good features of a s/w
They gave me hints. But I was not able to answer it
COMPILER ISRO INTERVIEW QUESTIONS 
46)Different stages of compiler.
I replied saying pre-processing, compilation. But he helped me saying that “not this. there are some stages during a compilation”. I understood my blunder. I replied with all the stages.
47)What are the different examples of Code optimization.
I answered with some examples. But it was not completely correct.
DBMS ISRO INTERVIEW QUESTIONS
This was the last question. But since i did not prepare dbms i politely replied “I cannot recollect sir”.
He said “OK . Thanks sandeep. Interview is over”
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HOW TO PREPARE FOR ISRO CSE INTERVIEW?
- Read previous interview experiences and go through Isro interview Questions.
- Revise GATE syllabus thoroughly once, you can use your GATE notes. Now focus will be on assertion-reason rather solving numerical questions. Why threading when multiprocessing is already there ? How will you design a firewall to stop a set of IP addresses ? What is the need of pipelining ? What other kinds of Databases are available ? Can you list some compiler optimizations and why they are used ? which algorithm will you prefer when people are submitting forms on ISRO website and we need to sort them based on name ? How priority queues are implemented ? What is CPU clock speed and what factors affect CPU clock speed ? Write a program to find whether two rectangles are overlapping or not ?
- Pick 4-5 favorite subjects and do extra revision. I used GeeksforGeeks articles during my preparations. They are effective also they are written in a very practical and comparative aspect.
- Try to retain basic pseudo codes in mind, like bakery algorithm, Peterson solution, congestion control alogrithm, Longest common subsequence etc.
- Try to touch those topics also which you have ignored partially or completely during GATE, because they ask question on them also.Like, what is CISC architecture, Symmetric and asymmetric multiprocessing, What are inodes and how free space are managed, etc.
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SUMMARY OF ISRO CSE INTERVIEW QUESTIONS /ISRO INTERVIEW EXPERIENCE
Here in this post we cover ISRO RECRUITMENT PROCESS,ISRO EXAM PATTERN PATTERN and shared some students ISRO CSE INTERVIEW EXPERIENCE and ISRO CSE INTERVIEW QUESTIONS and finally some brief guidance on how to prepare for your next ISRO interview .
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