Question
7 A meter long narrow tube closed at one end isheld horizontally, contains 38 cm long mercurycolumn which traps a 15 cm of air as shownWhat is the length of air column if the tube is heldvertically with open end at the top? \lbrack Atmosphericpressure is 76 cm of mercury\rbrack(1) 7.5 cm(3) 8 cm(2) 10 cm(4) 12 cm