Question

A barometer kept in a stationary elevator reads 76 cm. If the elevator starts accelerating up the reading will be

• A. Zero
• B. Equal to 76 cm
• C. More than 76 cm
• D. Less than 76 cm

Answer 1

Answer: (D)

Less than 76 cm

Answer 2

$h = \frac { P } { \rho g }$ ∴$h \propto \frac { 1 } { g }$. If lift moves upward with some acceleration then effective g increases. So the value of h decreases i.e. reading will be less than 76 cm