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

What is meant by atmospheric pressure?

What is the value of atmospheric pressure?

Name the instrument used to measure atmospheric pressure.

What does a falling barometer indicate?

How does the atmospheric pressure change with altitude?

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

What is the purpose of a barometer? State two major defects of a simple barometer.

Why do not we feel uneasy even under enormous pressure of the atmosphere above as?

How is the reading of a barometer affected when it is taken to: A mine

How is the reading of a barometer affected when it is taken to: A hill

A solid weighs 2.10 N in air. It has a relative density of 8.4. How much will the body weigh if placed: In water

A solid weighs 2.10 N in air. It has a relative density of 8.4. How much will the body weigh if placed: In a liquid of relative density 1.2

Name an instrument based on this principle. State two uses of the instrument that you describe.

State the principle of floatation. What can you say about the average density of a ship floating on water?

Explain the following:

An egg sinks in fresh water but floats in a strong solution of salt.

Explain the following:

A hydrometer is made heavy near the bottom.

Explain the following:

Icebergs floating in the sea are very dangerous for ships.

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