(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Physics

Explain how is the height of mercury column in tube of a simple barometer, a measure of the atmospheric pressure.

What is a barometer? 

Illustrate with the help of a labelled diagram of a simple barometer that the atmospheric pressure at a place is 76 cm of Hg.

Why is the barometric height used as unit to express the atmospheric pressure?

What is meant by the statement 'the atmospheric pressure at a place is 76 cm of Hg'? State its value in Pa.

How will you show that there is vacuum above the surface of mercury in a barometer? What name is given to this vacuum?

How is the barometric height of a simple barometer affected if  Its tube is pushed down into the trough of mercury?

How is the barometric height of a simple barometer affected if  Its tube is slightly tilted from vertical?

How is the barometric height of a simple barometer affected if A drop of liquid is inserted inside the tube?

State two uses of a barometer.

Give two reasons for use of mercury as a barometric liquid.

Give two reasons why water is not a suitable barometric liquid.

Mention two demerits of a simple barometer and state how they are removed in a Fortin barometer .

Draw a simple labelled diagram of a Fortin barometer and state how it is used to measure the atmospheric pressure.

What is an aneroid barometer? Draw a neat and labelled diagram to explain its construction and working.

State two advantages of an aneroid barometer over a simple barometer.

How is the reading of a barometer affected when it is taken to (i) a mine, and (ii) a hill?

How does the atmospheric pressure change with altitude? Draw an approximate graph to show this variation.

State two factors which affect the atmospheric pressure as we go up.

Why does a fountain pen leak at high altitude?