Final answer:
Dr. APJ Abdul Kalam was involved in India's second nuclear test series, Operation Shakti, in 1998 which demonstrated India's nuclear capabilities.
Step-by-step explanation:
The second nuclear test that involved Dr. APJ Abdul Kalam was held in 1998. Dr. Kalam, who later became the President of India, played a pivotal role in India's nuclear weapons program. Specifically, the series of tests that constituted India's second nuclear tests, known as Operation Shakti, were conducted in May 1998. These tests were significant in that they demonstrated India's ability to develop thermonuclear weapons and were a major part of India's emergence as a nuclear power.