Measurement of Atmospheric Pressure
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Questions and Answers

What happens to atmospheric pressure as altitude increases?

  • It increases
  • It fluctuates
  • It remains constant
  • It decreases (correct)

Why is mercury preferred as a barometric liquid in barometers?

  • It is a dull liquid
  • It wets glass easily
  • It has a high density (correct)
  • It has a low density

What property of mercury makes it easily visible in a barometer?

  • It wets glass easily
  • It is a shiny liquid (correct)
  • It is a dull liquid
  • It is not shiny

Who was the Italian scientist credited with first measuring atmospheric pressure using a barometer?

<p>Evangelista Torricelli (B)</p> Signup and view all the answers

Why does the mercury level in a barometer decrease when taken up a mountain?

<p>The air pressure is lesser (D)</p> Signup and view all the answers

What characteristic of mercury prevents it from wetting glass in a barometer?

<p>High density (A)</p> Signup and view all the answers

What is the purpose of an 'aneroid barometer'?

<p>To measure atmospheric pressure without using barometric liquid (C)</p> Signup and view all the answers

How does an aneroid barometer work?

<p>By balancing the internal fluid pressure with the external atmospheric pressure (B)</p> Signup and view all the answers

What is the role of the lift pump mentioned in the text?

<p>To lift water to a certain height without the use of electricity (D)</p> Signup and view all the answers

How does atmospheric pressure help in drinking through a straw?

<p>By creating low pressure inside the straw to suck up the liquid (C)</p> Signup and view all the answers

What happens when air is expelled out of a tin can due to heating according to the text?

<p>The can crushes under high atmospheric pressure (D)</p> Signup and view all the answers

What purpose does a syringe or perfume spray serve according to the text?

<p>To create low pressure for sucking up liquids (D)</p> Signup and view all the answers

What happens to the water level in the cylinder when valve v1 is closed?

<p>The water level stays the same (C)</p> Signup and view all the answers

Why does water rush above the piston when the pressure in the cylinder increases?

<p>Due to the weight of the water column in the tube (D)</p> Signup and view all the answers

What is a limitation of using a mercury barometer?

<p>It can easily get contaminated (B)</p> Signup and view all the answers

Why would it be impractical to use water as a barometric liquid?

<p>Because it requires a very large height of water (B)</p> Signup and view all the answers

What happens when the pressure inside the cylinder decreases during the piston's upward movement?

<p>Valve v1 opens (A)</p> Signup and view all the answers

How does water rise from the well into the cylinder?

<p>By opening valve v2 and closing valve v1 (B)</p> Signup and view all the answers

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