Sound — Science STD 9 — Question

Name the positively charged particle present in the atoms of all the elements.

Hybridisation involves crossing of genetically similar plants.

What kind of energy is possessedby the following?

A stretched rubber band.

Compare an electron, a proton and a neutron in respect of their relative masses and charges.

State whether the following statement is true or false:
Earth moves round the sun with uniform velocity.

During the downpour in a village, the rain water carried away excess of nitrogenous and other compounds present in the soil to a pond. How will they affect the growth of algae and phytoplankton in the pond?

An element X has a valency 1:
Write the chemical formula of its chloride.