The opposition demand for a JPC probe into 2G spectrum scam continued to rock both houses of Parliament for the 20th working day in a row today. The Lok Sabha and the Rajya Sabha were adjourned for an hour after the two houses assembled for the day following uproar over the issue. While the Rajya Sabha was adjourned till noon within minutes after it met for the day, the Lok Sabha was adjourned after welcoming the visiting Mongolian Parliamentary delegation led by its Chairman Damdingiin Demberel.