Which of India’s indigenously built nuclear-powered ballistic missile submarines is the INS Aridhaman?

Which of the following has become the world’s youngest officially rated chess player? 

Which of the following organizations celebrated its 68th founding anniversary on December 4, 2025? 

Where is the headquarters of UNICEF located, whose 79th anniversary was celebrated on December 11, 2025?

With which of the following countries has India signed the RELOS Logistics Support Agreement?