Question

A mercury barometer reads `75cm` in vertical position . If the tube is inclined by `60^(@)` to the vertical, the length of the mercury in the tube will be
A. 37.5 cm
B. 75cm
C. 112.5cm
D. 150cm

Answer 1

Correct Answer - D
`cos 60^(@) = h/l`

or, `l = (h)/(cos 60^(@)) = (75)/(1//2) cm = 150cm`.
The vertical height of mercury level in a barometer does not change.