Atmospheric pressure at a place is $66 c m$ of mercury. This place is

1250 m

above sea level

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1250 m

below sea level

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125 m

above sea level

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at the sea level

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Solution

The correct option is A $1250 m$ above sea level
Atmospheric pressure at the place is equivalent to that of $66 c m$ of mercury.
We know that atmospheric pressure at the sea level is equivalent to that of $76 c m$ of mercury.
So, pressure at that place is less by $(76 - 66) = 10 c m$ of mercury.
We know that atmospheric pressure decreases by $1 c m$ for every $125 m$ increase in altitude.
So, the concerned place is $(125 \times 10) m = 1250 m$ above the sea level.

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Atmospheric pressure at a place is 66cm of mercury. This place is

Atmospheric pressure at a place is $66 c m$ of mercury. This place is