Atoms and Molecules — Science STD 9 — Question

What do you mean by immediate cause of disease?

State any two properties for believing that aluminium is a metal.

Name the nitrogenous fertilizers.

Name the process associated with the following:
Fine beam of light entering through a small hole in a dark room, illuminates the particles in its paths.

Name the largest cell.

State which of the following situations are possible and give an example for each of these:
an object with a constant acceleration but with zero velocity.

State whether distance is a scalar or a vector quantity.

Name the physical quantity obtained by dividing ‘Distance travelled’ by ‘Time taken’ to travel that distance.

In the following questions, a statement of Assertion is given by the corresponding statement of Reason. Of the statements, mark the correct answer as:
Assertion: In crop rotation, two or more crops are grown together on same land.
Reason: It ensures maximum utilisation of nutrients supplied.

Name the process you would use to separate a mixture of anthracene and copper sulphate?