राज्य में पॉलीथीन पर प्रतिबंध कब लगाया गया ? - When was polyethylene banned in the state? - Rajya Me Polythene Par Pratibandh Kab Lagaya Gaya ? UP GK in hindi, विज्ञान एवं सूचना प्रौद्योगिकी 2012 question answers in hindi pdf 2013 questions in hindi, Know About 2011 UP GK online test UP GK notes in hindi quiz book 2014