9option 4 frm wat i ve understood
q to construct a barometer a tube of length 1 m is filled completely with mercury n is inverted in a mercury cup .the barometer reading on a particular day is 76 cm suppose a 1 m tube is filled with mercury up to 76 cm n then closed with a cork n cork is removed .height of mercury column in tube over the surface in cup ll be
1.zero
2 76 cm
3 >76 cm
4<76 cm
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UP 0 DOWN 0 0 1
