विश्व स्तर पर प्रतिवर्ष 'विश्व हिंदी दिवस' किस दिन मनाया जाता है?

On which date is National Startup Day observed in India?

Martyrs' Day (Shaheed Diwas) is observed in India on 30th January to commemorate the death anniversary of which leader?

Indian Newspaper Day is observed every year on which date to mark the launch of India's first printed newspaper, Hickey's Bengal Gazette?