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SSC CHSL Space & ISRO

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This page covers SSC CHSL Space & ISRO with complete concept notes, 29 graded practice MCQs, key points and exam-specific tips. Free to study.

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Concept Notes

Space & ISRO— Rules & Concept

Core ConceptRead this first — the foundation of the topic
Core Concept

ISRO (Indian Space Research Organisation) is India's national space agency established in 1969. It conducts satellite launches, space missions, and develops space technology for national development. Space questions cover satellites, rockets, missions, and basic space science

Launch Vehicles

PSLV (Polar Satellite Launch Vehicle) and GSLV (Geosynchronous Satellite Launch Vehicle) 2

Satellites

Communication, weather, navigation, and remote sensing satellites 3

Space Centers

Thumba (Kerala), Sriharikota (Andhra Pradesh), Bengaluru (Karnataka) 4

Major Missions

Chandrayaan (Moon), Mangalyaan (Mars), Gaganyaan (Human spaceflight)

Exam PatternsWhat examiners ask — read before attempting PYQs
1

ISRO mission names and years

2

Satellite types and purposes

3

Launch vehicle capabilities

4

Space centers and their locations

5

International space achievements

6

LEO (Low Earth Orbit): 3 hours or less

7

MEO (Medium Earth Orbit): 6-12 hours

8

GEO (Geostationary Orbit): 24 hours exactly

Worked ExampleSolve this step-by-step before moving on
1
Step 1

Apply 3-6-24 rule

2
Step 2

12 hours falls between 6-12 hours range

3
Step 3

This is Medium Earth Orbit (MEO) Answer: MEO satellite, commonly used for navigation systems like GPS Worked Example 2: ISRO Mission Timeline Question: Which came first - Chandrayaan-1 or Mangalyaan?

1
Step 1

Recall mission years using mnemonic 'Chan-Man' (2008-2013)

2
Step 2

Chandrayaan-1 launched in 2008

3
Step 3

Mangalyaan launched in 2013

4
Step 4

Time gap = 5 years Answer: Chandrayaan-1 came 5 years before Mangalyaan Exam Shortcut - ISRO Success Mnemonic: Use 'CHAMP' for major ISRO achievements: C - Chandrayaan (Moon mission, 2008) H - Heavy satellites (GSLV capability) A - Aryabhatta (First Indian satellite, 1975) M - Mangalyaan (Mars mission, 2013) P - PSLV (Workhorse rocket) Launch Vehicle Memory Trick: PSLV = Polar = Lighter satellites (up to 1750 kg to Sun-synchronous orbit) GSLV = Geosynchronous = Heavier satellites (up to 5000 kg to GTO) Space Center Location Trick: Thumb-a (Kerala) = Where it all began (first rocket launch) Srihari-kota = Satellite launching (both start with 'S') Bengal-uru = Brain center (ISRO headquarters)

Exam TrapsCommon mistakes students make — avoid these

#1: Students confuse PSLV and GSLV capabilities. Remember: PSLV is the 'workhorse' for lighter satellites and polar orbits. GSLV handles heavy communication satellites for geostationary orbits.

Many students pick GSLV for all satellite launches - this is wrong. PSLV has higher success rate and launches most satellites. Critical Exam Tips: 1. Focus on recent missions (last 5 years) - high probability questions 2.

Remember exact years for Chandrayaan, Mangalyaan, and Gaganyaan 3. Know the difference between rockets (PSLV/GSLV) and satellites (INSAT/IRS series) 4. Practice satellite orbit classification using the 3-6-24 rule International Space Facts: NASA (USA), Roscosmos (Russia), ESA (Europe), CNSA (China) are major space agencies.

International Space Station orbits Earth every 90 minutes. Moon is 384,400 km from Earth. Mars mission window opens every 26 months due to orbital mechanics.

Key Points to Remember

  • ISRO established in 1969, headquarters in Bengaluru
  • PSLV for polar orbits, GSLV for geostationary orbits - don't confuse
  • Satellite orbit formula: LEO<3hrs, MEO 6-12hrs, GEO=24hrs exactly
  • Chandrayaan-1 (2008), Mangalyaan (2013), Gaganyaan (upcoming human mission)
  • Aryabhatta was India's first satellite launched in 1975
  • Thumba (Kerala) - first rocket launch center in India
  • Sriharikota (Andhra Pradesh) - main satellite launch center
  • PSLV success rate over 95%, called India's workhorse rocket
  • Mars mission windows occur every 26 months due to orbital alignment
  • International Space Station completes orbit in 90 minutes

Exam-Specific Tips

  • ISRO was established on 15 August 1969
  • Aryabhatta, India's first satellite, was launched on 19 April 1975
  • Chandrayaan-1 was launched on 22 October 2008
  • Mangalyaan (Mars Orbiter Mission) was launched on 5 November 2013
  • PSLV first successful flight was on 15 October 1994
  • Thumba Equatorial Rocket Launching Station is located in Kerala
  • Satish Dhawan Space Centre is located in Sriharikota, Andhra Pradesh
  • Gaganyaan is India's first crewed spaceflight program planned for 2024-25
Practice MCQs

Space & ISRO — Practice Questions

29graded MCQs · easy to hard · full solution & trap analysis · showing 20 of 29

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Practice 1easy

Which of the following is NOT a major achievement of ISRO?

Practice 2easy

What is the name of India's lunar exploration mission that successfully landed on the Moon's south polar region in August 2023?

Practice 3easy

Which Indian space agency is responsible for the Chandrayaan and Mangalyaan missions?

Practice 4easy

In which year did ISRO successfully launch Chandrayaan-3, achieving a soft landing on the Moon's south polar region?

Practice 5easy

What is the name of India's primary satellite launch vehicle used to place satellites into orbit?

Practice 6easy

Which planet was the target of ISRO's Mangalyaan (Mars Orbiter Mission) launched in 2013?

Practice 7easy

Which rocket is used by ISRO to launch satellites into Geostationary Transfer Orbit (GTO)?

Practice 8easy

In which year did ISRO successfully test the Reusable Launch Vehicle (RLV) technology with the Hypersonic Flight Experiment (HEX)?

Practice 9easy

What is the primary objective of India's Mangalyaan (Mars Orbiter Mission)?

Practice 10easy

Which Indian space agency is responsible for India's space programme and satellite launches?

Practice 11medium

In which year did ISRO successfully launch the Mangalyaan (Mars Orbiter Mission), making India the first nation to reach Mars on its maiden attempt?

Practice 12medium

Which ISRO mission successfully demonstrated the soft landing on the Moon's south polar region in August 2023?

Practice 13medium

The Aditya-L1 mission, launched by ISRO in September 2023, is designed to study which celestial body?

Practice 14medium

What is the primary purpose of the Gaganyaan programme launched by ISRO?

Practice 15medium

The Mangalyaan mission, also known as the Mars Orbiter Mission (MOM), was launched by ISRO in which year?

Practice 16medium

Which Indian space agency successfully deployed the Chandrayaan-3 mission, achieving a soft landing on the lunar south pole in August 2023?

Practice 17medium

The Chandrayaan-1 mission, India's first lunar orbiter, was launched in which year and by which space agency?

Practice 18medium

Which of the following is the correct full form of GSLV, the launch vehicle developed by ISRO?

Practice 19hard

Which ISRO satellite series is primarily designed for Earth observation and remote sensing, and includes satellites like Resourcesat and Cartosat?

Practice 20hard

What is the orbital period of the Indian Regional Navigation Satellite System (NavIC/IRNSS) satellites?

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60-Second Revision — Space & ISRO

  • Remember: ISRO founded 1969, first satellite Aryabhatta 1975
  • Formula: LEO<3hrs, MEO 6-12hrs, GEO=24hrs for satellite classification
  • Trap: Don't confuse PSLV (polar, lighter) with GSLV (geostationary, heavier)
  • Key years: Chandrayaan 2008, Mangalyaan 2013, Gaganyaan upcoming
  • Locations: Thumba (first launch), Sriharikota (main center), Bengaluru (HQ)
  • Remember: Mars windows every 26 months, ISS orbits in 90 minutes
  • Focus: Recent missions get more questions than historical facts
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