Practice Test 4

India's space programme has achieved remarkable milestones over the past six decades that have placed the nation firmly among the world's leading spacefaring nations. The Indian Space Research Organisation, commonly known as ISRO, was established in 1969 under the visionary leadership of Dr Vikram Sarabhai with the objective of harnessing space technology for national development rather than for military or prestige purposes. Over the following decades, it developed indigenous launch vehicles, communication satellites, earth observation platforms, and deep space exploration missions with a fraction of the budget routinely spent by other major space agencies, earning worldwide admiration for the cost-effectiveness of its engineering approach. The successful launch of Chandrayaan-1 in October 2008 confirmed the presence of water molecules on the lunar surface through the Moon Mineralogy Mapper instrument provided by the American space agency, a discovery of global scientific significance that fundamentally changed our understanding of Earth's natural satellite. The Mars Orbiter Mission, popularly known as Mangalyaan, was launched in November 2013 and successfully entered Martian orbit in September 2014, making India the first Asian nation to accomplish this feat and the first country in the world to succeed in its maiden attempt at an interplanetary mission. The achievement was accomplished at a total project cost equivalent to the production budget of several Hollywood science fiction films, demonstrating India's unique mastery of frugal and innovative engineering that delivers world-class results within stringent financial constraints. The PSLV rocket, the workhorse of ISRO's launch vehicle fleet, has established a remarkable record of consecutive successes and has been used to launch satellites for numerous foreign customers including from the United States, Europe, and Southeast Asia, generating foreign exchange revenue and burnishing India's reputation as a reliable commercial launch provider. The GSLV Mark III, now renamed the LVM3, has demonstrated the capability to place heavier communication satellites into geostationary orbit, reducing India's dependence on foreign launch vehicles for high-capacity spacecraft. Chandrayaan-3, launched in July 2023 on the LVM3 rocket, made a historic soft landing on the southern polar region of the Moon on twenty-third August 2023, an area of particular scientific interest because of the potential presence of water ice in permanently shadowed craters. The successful landing made India the fourth country in history to achieve a soft landing on the Moon and the first to reach its south polar region, ahead of competing missions from other spacefaring nations. The mission's Pragyan rover traversed the lunar surface in the days following landing, gathering valuable data on soil composition, surface temperature, and subsurface structure that will inform future exploration efforts and contribute to the global scientific understanding of the Moon. Aditya-L1, launched in September 2023, is India's first dedicated solar observatory mission, positioned at the L1 Lagrange point between Earth and the Sun to study solar wind, coronal mass ejections, and other solar phenomena that affect space weather around Earth.