The Fundamental Unit of Life — Science STD 9 — Question

Name the laws involved in the following situation:
a body of mass 5kg can be accelerated more easily by a force than another body of mass 50kg under similar conditions.

State whether the following statement is true or false:
Unbalanced forces acting on a body change its shape.

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

Mention at least one point that is common to living organisms and machines.

Work out the formulae for the following compounds:
Sodium oxide.

Give one example of a radioactive isotope which is used as a fuel in the reactors of nuclear power plants.

Give one example of diffusion of gases in a liquid.

Which of the following will show “Tyndall effect”?

1. Salt solution.
2. Milk.
3. Copper sulphate solution.
4. Starch solution.

Name one common substance which can be easily changed from one state to another by heating or cooling.