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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?

Evangelista Torricelli (B) Signup and view all the answers

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

The air pressure is lesser (D) Signup and view all the answers

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

High density (A) Signup and view all the answers

What is the purpose of an 'aneroid barometer'?

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

How does an aneroid barometer work?

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

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

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

How does atmospheric pressure help in drinking through a straw?

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

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

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

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

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

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

The water level stays the same (C) Signup and view all the answers

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

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

What is a limitation of using a mercury barometer?

It can easily get contaminated (B) Signup and view all the answers

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

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

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

Valve v1 opens (A) Signup and view all the answers

How does water rise from the well into the cylinder?

By opening valve v2 and closing valve v1 (B) Signup and view all the answers