Human Eye and Colourful World — Science STD 10 — Question

Name the three allotropic forms of carbon.

What is the atomic number of carbon. Write its electronic configuration.

A beaker of concentrated hydrochloric acid has a pH of 1. What colour will full range universal indicator turn if it is added to this beaker? Is it a strong or a weak acid?

The power of a lens is +0.2D. Calculate its focal length.

"We need to manage our resources." List two reasons to justify this statement.

Mendel said that the characteristics or traits of organisms are carried from one generation to the next by internal factors which occur in pairs. What is the modern name for these factors?

In a human, how many chromosmes are present in:an egg which has just been produced by the ovary?

What name has been given to those organisms which break down the complex organic compounds present in dead animals and plants?

In the reactor of a nuclear power plant, name the material which is used:
As a moderator.

Which hormone:
Gives boys a deep voice?