Litmus paper, long known as a low-tech method of testing substances for acidity, might have a new use as a cheap, quick way to test for E. coli, according to researchers at McMaster University in ...

Download UP Lekhpal previous year paper PDFs with solutions. Check subject-wise papers, exam pattern, and the benefits of solving past papers.

News that millions of students who took the PARCC exams on computers tended to score worse than those who took the tests on paper raises an important question: Do the computer-based exams that are ...