Q. Which of the below was the first mission to achieve soft landing on Mars?
Answer:
Mars 3
Notes: The Soviet Union initiated Mars exploration with the Mars 1M series of uncrewed spacecraft in 1960 for flyby missions. In 1971, the USSR's Mars 3 became the first to achieve a soft landing. NASA's Mariner 4, launched in 1964, was the first successful flyby, while Mariner 9, also in 1971, was the first to enter Martian orbit. India's Mars Orbiter Mission was the first to successfully achieve Mars orbit insertion on its first attempt.