Sound — Science STD 9 — Question

Name the physical state of matter which can be easily compressed.

Out of solids, liquids and gases:
In which medium sound travels slowest?

Name the principle which gives the magnitude of buoyant force acting on an object immersed in a liquid.

Which technique is used in a washing machine to squeeze out water from wet clothes while drying?

Name a non-metal:
Which is required for combustion.

What name is given to sound waves of frequencies higher than 20kHz?

What do we call this number which is characteristic of a particular element?

How much work is done by the gravitational force of earth acting on a satellite moving around it in a circular path? Give reason for your answer.

Which of the following are isotopes and which are isobars?
Argon, Deuterium, Calcium, Tritium, Protium.

How many times is a proton heavier than an electron?