17 अगस्त 2026 को निम्न में से किस देश का 81 स्वतंत्रता दिवस मनाया गया?

Which of the following has developed a portable optical sensing device named ‘E-Eye’ to detect toxic substances in water? 

How many Indian peacekeepers deployed in South Sudan were awarded the UN Medal under the United Nations mission?

Who was Raja Sen, who passed away at the age of 71?

Who among the following will be awarded the prestigious NASI Young Scientist Platinum Jubilee Award 2026 for contributions to Earth Sciences?