Which death anniversary of India’s second President, Dr. Sarvepalli Radhakrishnan, was observed on April 17, 2026?

 What rank has India been assigned globally in terms of patent filings for the fiscal year 2025-26? 

Biju Patnaik was the former Chief Minister of which state, whose 29th death anniversary was observed on April 17, 2026?

What is the name of India’s first dedicated nuclear missile tracking and ocean surveillance ship deployed in the Arabian Sea? 

In which of the following states has the Indian Army’s Trishakti Corps launched ‘Operation Himsetu’?