Comprehension
When we hear the name SPACE, only one organization comes to mind: the Indian Space Research Organization (ISRO). The Indian Space Research Organization (ISRO), located in Bengaluru, is the country’s first space agency. ISRO was founded in 1969 with the goal of developing and utilizing space technology for national development while also conducting planetary exploration and space science research. The space research operations began in India in the early 1960s, at a time when satellite applications were still in the experimental stages in the United States. Dr. Vikram Sarabhai, the founding father of India’s space programme, rapidly recognized the benefits of space technologies after the live transmission of the Tokyo Olympic Games across the Pacific by the American satellite ‘Syncom-3’ demonstrated the power of communication satellites. The ISRO has launched various spacecrafts like the Chandrayaan, Astrosat, Microsat, GSAT etc. The Government of India has also approved a regional spaceborne navigation system, which will consist of seven satellites. Out of these, four of them will be placed in geosynchronous inclined orbit of 29° relative to the equatorial plane. Such an arrangement would mean all seven satellites would have continuous radio visibility with Indian control stations.
Question: 1

Name the first dedicated mission launched by ISRO for studying the celestial sources in X-ray, optical and UV spectral bands simultaneously.

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ISRO’s astronomy missions: - Astrosat → multi-wavelength space observatory - Chandrayaan → lunar exploration - Gaganyaan → human spaceflight
Updated On: Jul 10, 2026
  • Amazonia
  • Astrosat
  • Gaganyaan–1
  • Lunar Polar Exploration Mission
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The Correct Option is B

Approach Solution - 1

Astrosat is India’s first dedicated multi-wavelength space observatory. Launched by ISRO in 2015, it observes celestial objects across X-ray, ultraviolet (UV), and optical spectral bands simultaneously, providing valuable data for astrophysical research.
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Approach Solution -2

Elimination approach:
Amazonia is a Brazilian earth-observation satellite, not an ISRO mission. Gaganyaan-1 is India's planned human spaceflight test vehicle, meant for crewed missions rather than astronomical observation. The Lunar Polar Exploration Mission (LUPEX) is a joint ISRO-JAXA mission aimed at the Moon's south pole, not a multi-wavelength observatory. Ruling these out leaves Astrosat, ISRO's 2015 space telescope built specifically to observe X-ray, optical, and UV sources at the same time.
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Approach Solution -3

The question asks for ISRO's first mission built to study X-ray, optical and UV sources at the same time. Look at what each option actually is.

  1. Amazonia: a series of Brazilian earth-observation satellites run by Brazil's space agency INPE to track deforestation and land use. It has no connection to ISRO and carries no astronomy instruments.
  2. Astrosat: ISRO's own multi-wavelength space observatory, launched in 2015 on a PSLV rocket. It carries five separate payloads that together cover the X-ray, ultraviolet and optical bands, letting scientists study one celestial source across all three at once. This matches every part of the question.
  3. Gaganyaan-1: the uncrewed test flight of ISRO's human spaceflight programme, meant to check the safety of the crew module before astronauts fly. It is a human spaceflight test, not an astronomy observatory.
  4. Lunar Polar Exploration Mission: also called LUPEX, a joint ISRO-JAXA mission planned to land near the Moon's south pole and study water ice there. It targets the Moon's surface, not distant celestial sources across several wavelength bands.

Only Astrosat is an ISRO observatory built to observe X-ray, optical and UV sources together, while the other three fail on either the "ISRO" part or the "multi-band astronomy" part.

The correct answer is Astrosat.

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Question: 2

APPLE, the first communication satellite of ISRO, was launched from:

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APPLE = ISRO’s 1st communication satellite → launched on Ariane → from Kourou.
Updated On: Jul 10, 2026
  • Satish Dhawan Space Centre, Sriharikota
  • TERLS, Thiruvananthapuram
  • Kourou, French Guiana
  • SSLV Launching Station, Tamil Nadu
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The Correct Option is C

Approach Solution - 1

ISRO’s first experimental communication satellite APPLE was launched in 1981 by the Ariane launch vehicle from Kourou, French Guiana.
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Approach Solution -2

Elimination approach:
Satish Dhawan Space Centre (Sriharikota) and the SSLV launch station in Tamil Nadu are Indian sites used for later, indigenously launched satellites, while TERLS at Thiruvananthapuram was used only for early sounding rocket launches. In 1981, India did not yet have a rocket capable of placing a satellite like APPLE into orbit, so it had to be launched aboard the European Ariane rocket. This points to Kourou, French Guiana, the European Space Agency's launch site.
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Approach Solution -3

The question asks where APPLE, ISRO's first communication satellite, was launched from. Look at what each site was actually used for around 1981.

  1. Satish Dhawan Space Centre, Sriharikota: India's main satellite launch site, but it was built up for indigenous PSLV and GSLV launches from the 1990s onward, well after 1981.
  2. TERLS, Thiruvananthapuram: the Thumba Equatorial Rocket Launching Station, India's earliest launch facility, but it was only ever used for small sounding rockets studying the upper atmosphere, never for putting a satellite into orbit.
  3. Kourou, French Guiana: the European Space Agency's spaceport, used to launch the Ariane rocket. Since India had no orbital launch vehicle of its own in 1981, APPLE had to fly on a foreign rocket from here.
  4. SSLV Launching Station, Tamil Nadu: home to ISRO's Small Satellite Launch Vehicle programme, which only began flights decades later, in the 2020s, so it could not have hosted a 1981 launch.

Only Kourou was actually capable of launching a satellite in 1981, so APPLE went up from there aboard an Ariane rocket.

The correct answer is Kourou, French Guiana.

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Question: 3

Name the spacecraft that has been successfully sent into space to probe the planets in the solar system.

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Mariner series → planetary probes. Mariner 10 → Venus + Mercury.
Updated On: Jul 10, 2026
  • Sputnik 19
  • Cosmos 482
  • Pioneer-E
  • Mariner 10
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The Correct Option is D

Approach Solution - 1

Mariner 10 was a NASA robotic spacecraft sent to probe planets in the solar system. It successfully performed flybys of Venus and Mercury, becoming the first mission to visit Mercury.
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Approach Solution -2

Elimination approach:
Sputnik 19 and Cosmos 482 were Soviet Venus-probe launches that failed to leave Earth orbit, so they never reached another planet. Pioneer-E was lost to a launch vehicle failure and never became operational. Only Mariner 10 actually reached its targets, flying past both Venus and Mercury and returning the first close-up images of Mercury.
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Approach Solution -3

The question asks for the spacecraft that was successfully sent to probe the planets of the solar system. Look at what actually happened to each named craft.

  1. Sputnik 19: a Soviet designation given to a failed Venus-probe launch that never left Earth orbit because of a rocket fault, so it never reached another planet.
  2. Cosmos 482: another Soviet Venus probe whose upper stage failed, stranding it in Earth orbit for decades.
  3. Pioneer-E: intended as a NASA solar-observing probe, but it was destroyed when its Delta rocket failed shortly after launch, so it never became operational.
  4. Mariner 10: reached and photographed both Venus and Mercury, using Venus's gravity to bend its path toward Mercury and becoming the first spacecraft to visit that planet.

Three of the four never even escaped Earth orbit or never flew at all, while Mariner 10 actually completed its planetary flybys.

The correct answer is Mariner 10.

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Question: 4

The first successful nuclear bomb test conducted by India in 1974 is called the:

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1974 → Smiling Buddha 1998 → Pokhran-II (Operation Shakti)
Updated On: Jul 10, 2026
  • Prithvi
  • Pokhran-II
  • Smiling Buddha
  • Surya
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The Correct Option is C

Approach Solution - 1

India’s first nuclear test, conducted on 18 May 1974 at Pokhran, was code-named Smiling Buddha. It marked India’s entry into the group of nuclear-capable nations.
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Approach Solution -2

Elimination approach:
Prithvi and Surya are names of Indian missile programmes, not nuclear tests, while Pokhran-II refers to India's second round of nuclear tests conducted in 1998, not 1974. Removing these leaves Smiling Buddha, the code name given to India's first nuclear test carried out on 18 May 1974.
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Approach Solution -3

The question asks for the code name of India's first nuclear test, conducted in 1974. Check what each option actually refers to.

  1. Prithvi: the name of an Indian short-range ballistic missile programme, not a nuclear test.
  2. Pokhran-II: the code name for India's second round of nuclear tests, carried out in 1998, not 1974.
  3. Smiling Buddha: the code name given to India's first underground nuclear test, conducted on 18 May 1974 at Pokhran.
  4. Surya: the name sometimes used for a long-range Indian missile concept, again a missile, not a nuclear test.

Two of the four names are missiles and one is the wrong nuclear test, leaving only the correct 1974 test.

The correct answer is Smiling Buddha.

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Question: 5

NaviC covers India and a region extending:

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NavIC coverage radius → 1,500 km beyond India’s borders.
Updated On: Jul 10, 2026
  • 1,500 km
  • 2,000 km
  • 7,000 km
  • 1,000 km
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The Correct Option is A

Approach Solution - 1

NavIC (Navigation with Indian Constellation) provides coverage over India and a region extending up to 1,500 km beyond the Indian landmass.
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Approach Solution -2

Elimination approach:
NavIC was designed as a regional system, not one with a coverage radius as large as 7,000 km, so that option can be ruled out. Values such as 2,000 km and 1,000 km do not match ISRO's stated design specification for the primary service area. The figure officially given for coverage beyond India's borders is 1,500 km.
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Approach Solution -3

The question asks how far NaviC's coverage extends beyond India. Check each figure against ISRO's stated design.

  1. 1,500 km: the figure ISRO has stated as NaviC's service-area extension beyond India's landmass.
  2. 2,000 km: larger than the stated design figure and does not match ISRO's published specification.
  3. 7,000 km: far too large for a regional system like NaviC, which was deliberately built with a limited service radius rather than global coverage.
  4. 1,000 km: smaller than the actual figure ISRO has specified for the primary service area.

Only one of the four figures matches the officially stated coverage extension.

The correct answer is 1,500 km.

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