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

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?

Why does nose start bleeding on high mountains?

What is an altimeter? State its principle. How is its scale calibrated?

What do the following indicate in a barometer regarding weather : gradual fall in the mercury level

What do the following indicate in a barometer regarding weather : sudden fall in the mercury level

What do the following indicate in a barometer regarding weather : Gradual rise in the mercury level?

The unit torr is related to the barometric height as :

The normal atmospheric pressure is : 

The atmospheric pressure at earth's surface is P₁ and inside mine is P₂. They are related as : 

At sea level, the atmospheric pressure is 1.04 x 10⁵ Pa. Assuming g = 10 m s^-2 and density of air to be uniform and equal to 1.3 kg m^-3, find the height of the atmosphere.

At sea level, the atmospheric pressure is 76 cm of Hg. If air pressure falls by 10 mm of Hg per 120m of ascent, what is the height of a hill where the barometer reads 70 cm Hg. State the assumption made by you.

Convert 1 mm of Hg into pascal. Take density of Hg = 13.6 x 10³ kg m^-3 and g = 9.8 m s^-2 .

At a given place, a mercury barometer records a pressure of 0.70 m of Hg. What would be the height of water column if mercury in barometer is replaced by water? Take density of mercury to be  = 13.6 × 10³ kg m^-3.

State the principle of floatation.