किस वर्ष टेलीविजन को आकाशवाणी से पृथक् कर 'दूरदर्शन' नामक स्वतंत्र संगठन के रूप में स्थापित किया गया?

In which year was Doordarshan separated from All India Radio to be established as an independent organization?

The motto 'Bahujan Hitaya, Bahujan Sukhaya' is inscribed on the emblem of which organization?

In which year was the 'Indian Broadcasting Service' renamed to 'All India Radio' (A.I.R.)?