Is Matter Around Us Pure? — Science STD 9 — Question

What is the SI unit of retardation?

What difference in the properties of common salt and sand would enable you to separate a mixture of these two substances?

When a ball is thrown vertically upwards, its velocity goes on decreasing. What happens to its potential energy as its velocity becomes zero?

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

Write the energy transformations which take place in an electric bulb (or electric lamp).

Name the property of any one of the components which can be used for separation the following mixture:
Salt and Camphor.

What is the numerical value of Avogadro number?

Give the names and symbols of five familiar substances which you think are elements.

Describe the energy changes which take place in a radio.

Name one metal and one non-metal which exist as liquids at room temperature.