Chargaff analyzed the composition of DNA from various sources. Mention what were his implications from all his experiments.

What made Hill to perform his experiment?

What were the total number of varieties of garden pea that Mendel had to study to start his experiments?

Pure water can be obtained from various sources, but it always contains hydrogen and oxygen, combined in a ratio of 1:8 by weight. This is an example of ________

In what way is diffraction from each slit related to the interference pattern in a double-slit experiment ?

What will be the colour of the sky as seen from the earth if there were no atmosphere?

At what distance a watch maker must hold his lens from the watch?

Answer the following questions : What were the conclusions drawn from the alpha particle experiment performed by Rutherford ?

A 1.5 m tall boy is standing at some distance from a 30 m tall building. The angle of elevation from his syes to the top of the building increases from his eyes to the top of the building increases from 30^@ to 60^@ as he walks towards the building. Find the distance he walked towards the building.

To hear the echo distinctly,will the distance from the source of sound to the reflecting surface be same at all temperatures? Explain your answer.

It is said that elemental composition of living organisms and that of in animate objects (like earth's crust) are similar in the sense that all the majorelements are present in both. Then what would be the difference between these two groups? Choose a correct answer from among the following: