400+ TOP ISRO Interview Questions and Answers

ISRO Interview Questions for freshers and experienced :-

1. What Is The Full Form Of ISRO ?

ISRO Stands for Indian Space Research Organisation

2. Who Is Considered As The “founding Father” Of Indian Space Programme?

Dr Vikram A Sarabhai is considered as the founding father of space programmes in India.

3. When Was Isro Formed?

ISRO was formed on August 15, 1969.

4. When Was Department Of Space Constituted?

Department of Space (DOS) and the Space Commission were set up in 1972. ISRO was brought under DOS on June 1, 1972.

5. What Is The Main Objective Of Isro?

The prime objective of ISRO is to develop space technology and its application to various national needs.

ISRO Interview Questions
ISRO Questions

6. How These Objectives Are Met?

ISRO has established two major space systems, INSAT for communication, television broadcasting and meteorological services, and Indian Remote Sensing Satellites (IRS) system for resources monitoring and management. ISRO has developed two satellite launch vehicles, PSLV and GSLV, to place INSAT and IRS satellites in the required orbits.

7. Where The Satellites Are Made?

Satellites are made at ISRO Satellite Centre (ISAC), Bangalore.

8. Where The Rockets / Launch Vehicles Are Made?

Rockets / Launch Vehicles are made at Vikram Sarabhai Space Centre (VSSC), Thiruvanathapuram.

9. From Where Are The Rockets Launched?

ISRO’s Launch facility is located at SDSC SHAR from where Launch Vehicles and Sounding Rockets are launched. Sounding rockets are also launched from TERLS at Thiruvananthapuram.

10. How Can I Order For Satellite Data?

You can get data from National Remote Sensing Centre (NRSC), Hyderabad.

11. Where The Space Programme Began In India?

Indian Space Programme began at Thumba Equatorial Rocket Launching Station (TERLS) located at Thumba near Thiruvanathapuram.

12. Why Was Thumba Selected For Being Rocket Launching Station?

The geomagnetic equator of the earth passes over Thumba.

13. What Is A Sounding Rocket?

A sounding rocket is a rocket, which is intended for assessing the physical parameters of the upper atmosphere.

14. What Does The Letter ‘rh’ And The Numerals On An Indian Sounding Rocket Signify?

RH stands for ‘Rohini’ sounding rocket and the numeral indicate the diameter of the rocket in mm.

15. When Was The First Rocket Launched In India? Which Was The Rocket?

The first rocket, a Nike-Apache, procured from the US, was launched on November 21, 1963.

16. When Did India Begin Developing Its Own Rockets?

India’s first indigenous sounding rocket, RH-75, was launched on November 20, 1967.

17. What Is The Expansion Of Vssc And When It Was Formed?

Space Science and Technology Centre (SSTC) was renamed as Vikram Sarabhai Space Centre (VSSC) in 1972 in honor of Dr Vikram Sarabahi who met with his untimely demise on December 30, 1971.

18. How Many Centres Are There In Isro?

There are six major Centres and several other Units, Agencies, Facilities and Laboratories spread across the country.

19. Where Are These Centres Located?

Vikram Sarabhai Space Centre (VSSC), Thiruvananthapuram; ISRO Satellite Centre (ISAC), Bangalore; Satish Dhawan Space Centre (SDSC – SHAR) at Sriharikota; Liquid Propulsion Systems Centre (LPSC) at Thiruvananthapuram, Bangalore and Mahendragiri, Space Application Centre (SAC), Ahmedabad and National Remote Sensing Centre (NRSC), Hyderabad.

20. What Is The Major Function Of These Centres?

Launch Vehicles are build at VSSC, Thiruvananthapuram; Satellites are designed and developed at ISAC, Bangalore; Integration and launching of satellites and launch vehicles are carried out from SDSC, Shriharikota; Development of liquid stages including cryogenic stage is carried out at LPSC, Sensors for Communication and Remote Sensing satellites and application aspects of the space technology are taken up at SAC, Ahmedabad and Remote Sensing satellite data reception processing and dissemination by NRSC, Hyderabad.

21. Which Is The First Launch Vehicle Of India?

Satellite Launch Vehicle-3 (SLV-3) is the first launch vehicle of India..

22. When Was It Launched?

The first successful launch of SLV-3 took place on July 18, 1980 from SDSC SHAR.

23. What Are The Other Launch Vehicles Developed By India?

Apart from SLV-3, India developed Augmented Satellite Launch Vehicle (ASLV), Polar Satellite Launch Vehicle (PSLV) and Geosynchronous Satellite Launch Vehicle (GSLV).

24. How Satellites Are Broadly Classified?

Satellites are broadly classified into two, viz., Communication satellites and Remote Sensing satellites.

25. What Is A Communication Satellite?

A communication satellite usually operates from the Geosynchronous orbit catering to requirements in communication, television broadcasting, meteorology, disaster warning etc.

ISRO Questions and Answers Pdf ::

26. What Is A Remote Sensing Satellite?

A Remote Sensing satellite is intended for natural resource monitoring and management and operates from a Sun Synchronous Polar Orbit (SSPO).

27. What Is Nnrms?

NNRMS is the acronym for National Natural Resources Management System. NNRMS is an integrated resources management system aimed at optimal utilisation of the natural resources of the country by proper and systematic inventory of resource availability using Remote Sensing data in conjunction with conventional techniques.

28. Which Is The First Indian Satellite?

Aryabhata is the first Indian satellite

29. From Where Was It Launched?

It was launched from the former Soviet Union on April 19, 1975.

30. Which Is The Heaviest Satellite Launched By India From Indian Soil?

INSAT-4CR weighing 2130 kg and launched by GSLV-F04 on September 2, 2007 is the heaviest satellite launched from India.

31. How Many Launches Of Launch Vehicles Were Carried Out So Far?

38 launch vehicle missions were carried from India so far (till March 2013).

32. How Many Satellites Have Been Launched By India?

68 + 35 (foreign) satellites were put into orbit so far (till March 2013).

33. Which Is The First Operational Launch Vehicle Of India?

PSLV is the first operational launch vehicle of India. It had so far three developmental flights and nineteen operational flights – 21 continuously successful flights.

34. What Is Chandrayaan-1?

Chandrayaan-1 is a scientific investigation – by spacecraft – of the Moon. The name Chandrayaan means “Chandra- Moon, Yaan-vehicle”, –in Indian languages (Sanskrit and Hindi) , – the lunar spacecraft. Chandrayaan-1 is the first Indian planetary science and exploration mission.

35. When, And From Where, Chandrayaan-1 Was Launched?

Chandrayaan-1 was launched on October 22, 2008 from Satish Dhawan Space Centre at Sriharikota (SHAR), India.

36. How Long Chandrayaan-1 Was Operational?

Chandrayaan-1 was operational for 312 days till August 28, 2009.

37. What Are Chandrayaan’s Scientific Goals?

The Chandrayaan-1 mission is aimed at high-resolution Remote Sensing of the Lunar surface in visible, near Infrared, low energy X-rays and high-energy X-ray regions. Specific scientific goals are: To prepare a three-dimensional atlas (with a high spatial and altitude resolution of 5-10 m) of both near and far side of the moon. To conduct chemical and mineralogical mapping of the entire lunar surface for distribution of mineral and chemical elements such as Magnesium, Aluminium, Silicon, Calcium, Iron and Titanium as well as high atomic number elements such as Radon, Uranium & Thorium with high spatial resolution. By simultaneous photo geological and chemical mapping, we will be able to identify different geological units, which will test the hypothesis for the origin and early evolutionary history of the moon and help in determining the nature of the lunar crust.

38. What Are The Scientific Instruments Onboard Chandrayaan-1?

There are eleven scientific instruments onboard Chandrayaan-1 spacecraft. Five of them are Indian and other six are from ESA (3), NASA (2) and Bulgarian Academy of Sciences (1) selected through ISRO Announcement of Opportunity (AO). Two of the ESA instruments have Indian collaboration.

39. What Is The Temperature On The Moon?

The moon undergoes extremes in temperature the side of the Moon receiving sunlight becomes scorching hot at about 130 ºC, and freezing cold at -180 ºC during night.

40. Is There Any Life On Moon?

So far none of the lunar missions have detected any signature of presence of life on the Moon.

41. Why Do We See Only One Side Of The Moon?

As the Moon orbits, it always presents the same side towards the Earth. This is so because Earth’s gravity has slowed the Moon’s rotation so that it just matches the time it takes to go around the Earth. So the Moon takes the same amount of time to revolve around the Earth as it takes to rotate around its spin axis.

42. What Is The Total Budget For Realising Chandrayaan-1 Mission?

The budgetary estimate for realising the proposed Indian lunar mission Chandrayaan-1 stands at Rs. 386.00 crores (about $76 million). This includes Rs. 53.00 crores (about $11 million) for Payload development, Rs. 83.00 crores (about $17 million) for Spacecraft Bus, Rs. 100.00 crores ($20 million) towards establishment of Deep Space Network, Rs. 100.00 crores ($20 million) for PSLV launch vehicle and Rs. 50.00 crores ($10 million) for scientific data centre, external network support and programme management expenses.

43. What Is Antrix?

Antrix is the commercial wing of ISRO, a single window agency for marketing Indian space capabilities both products and services to the world.

ISRO Interview Questions For Mechanical Engineering :-

    • Draw a thick cylinder. How will you classify thin and thick cylinders?
    • What if there is external pressure and no internal fluid?
    • Draw one cantilever with point load at one end. Tell me the deflection at free end.tell me the formula
    • Cut it in two pieces and tell me about shear forces at different points. Draw its shear force and bending moment diagram.
    • How will shear stress vary?
    • What is the relation between average and maximum shear stress?
    • What if beam is circular?
    • There is a rectangular beam hanging with a cable on a crane. The weight of beam is 10 tonnes. Angle b/w cables is 60 degree. What will be tension in the cable?
    • In projectile motion at what angle the range is maximum?
    • Write rigid body equation of motion?
    • If i give you perimeter= 12 m can you find the dimensions for maximum area?
    • Do you know what was ISRO last mission all about?
    • what is heat shield?
    • What is the difference between Centripetal and Centrifugal Force ?
    • Can they act on a body simultaneously ?
    • Tell me difference between Governor and Flywheel. Factors to be considered for designing flywheel, like mass, stiffness and other things.
    • How it stores energy, How angular velocity gets changed ?
    • What is product moment of Inertia?What is its significance ?
    • What is Nusselt no.? Give practical exam.
    • How can you join two objects without using Nut Bolt fixture?
    • Tell me basic definition of welding.
  • Draw a beam on board with both ends fixed. And show me what reactions will be there if u load it with UDL..!
  • Tell me is this beam determinate or indeterminate?
  • Do u know about dynamic loading and design? draw a graph and explain.
  • write down the 3 dimensional heat conditional equation.
  • for different boundary conditions how will the equation vary?
  • in internal heat generation , what is the temperature profile in slab? how did u get it?
  • What is humidity?
  • What is dehumidification?
  • What is the difference between paints and Coating?
  • What is cruising speed of an automobile?
  • Design a vessel to store a liquid of certain volume
  • If I want to put a cryogenic fluid into the vessel which shape should I choose.
  • Draw a “W” on board and if one end is fixed and a horizontal force is acting at other end then design the “W”.
  • Draw the Iron-Carbide diagram and what is significance of this diagram and why do we use this diagram?
  • From what %age of carbon, cast iron begins to develop?
  • What are the laws of thermodynamics? Explain all.
  • What is newton’s law of viscosity?
  • What are Newtonian fluids? what are different types of Non-Newtonian fluids?
  • Draw the shear stress – strain diagram for these fluids. Draw for an ideal fluid and perfect plastic fluid.
  • What is a perfect plastic fluid?
  • Write down the generalized 3-dimensional conduction heat transfer equation.
  • Derive the 2 dimensional transient heat conduction equation.
  • Design a vessel to store a liquid of certain volume.
  • Questions on stainless steel and its properties.
  • Types of springs. draw the spring with all the details.
  • Define free and solid lengths.
  • Dhat is spring index. range of spring index.
  • To a machine 50 mm diameter hole with close tolerance, which machining progression will you use?
  • Tell me the machine elements use for automobile suspension.
  • Type of springs used in clocks
  • Draw a V-shaped structure, fixed at its top(both ends). 45 degree is the angle between the two arms of the V…a load,W acting on it at its bottom..tell about its stiffness?
  • Draw a rotating shaft supported at its ends by bearing..Apply a concentrated load at the middle of the shaft(at its top)..Design it??
  • Drive Cp,Cv relation
  • Consider a Beam of Rectangular x-sec , you have strain gauge and material properties are known. how will you find force acting on it?
  • If you want to calculate stress in other directions also, how many strain gauges will be required?
  • Write the expression of strains in all 3-directions
  • Which angle of projection do we use and why in Engineering Drawing?
  • What does the dotted lines indicate in ED?
  • Derive Work done in Isothermal Process
  • You have gas turbine, how can you increase the speed of Rotation of Turbine – I told them we can use Governor
  • Derive the expression of speed variation in Porter governor.
  • Explain hydro dynamic and thermal boundary layer.
  • what are the factors affect the friction both for laminar and turbulent.
  • let’s assume hot fluid passing through a pipe. what are the modes of heat transfer across the pipe. Explain.
  • Critical thickness , significance prandtl number , lewis no. , Nussel No.
  • Why we should use Gear ?
  • what about Scooty gear mechanism ?
  • What is the shear stress and bending moment distribution in hollow rectangular beam.
  • What is stiffness?
  • Draw a spring and told me to explain how diameter of coil varies with stiffness.
  • Do you know the laws of thermodynamics? can you tell us a bit about them.
  • what is entropy?
  • Derive Cp – Cv=R.
  • What’s choked Flow?
  • what’s the velocity at the smallest cross section in the choked flow?
  • why doesn’t the mass flow increase even with decreasing back pressure?
  • What is newton’s law of viscosity?
  • What are the types of viscosity?
  • Do you know about stoke and poise?
  • Tell us a bit about fits and tolerances?
  • Which assembly type do we use? Why?
  • Will the hole and shaft always fit in interference fit?
  • what are composites and how are they different from alloys?
  • What are the different theories of failure?
  • What theory will you use for cast iron?
  • What are the different methods to join metals?

ISRO Interview Details :-

  1. Panel may consists of 5-10 senior scientists, IIT faculties etc.
  2. They may ask you to choose your top 3-5 favourite questions.
  3. They may mask ask questions from your favourite subjects or may not.
  4. You need to give full explanation of every question/topic asked.
  5. Be familiarized with Blackboard teaching as you may have explain on blackboard.
  6. They may ask you about your B.Tech final year project. But It completely depends on them.
  7. For M.Tech students prepare well the M.Tech thesis topic.
  8. Reach interview venue before time.
  9. Check all documents, a day in advance.
  10. Don’t forget to keep a pen with you in interview room.

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