high school science notes

The capillaries lining the alveoli have impure blood which has low concentration of oxygen. So, the oxygen from the air easily diffuses into the blood through the thin barrier of the alveolus wall. Similarly since the concentration of carbon dioxide is quite high in the blood, the g..

Summary - The grouping of elements with similar properties together and the separation of elements with dissimilar properties is known as classification of elements. The table, which classifies elements on the basis of their properties, is called the periodic table. The earliest classification was ..

Nipermag is an alloy of iron, nickel, aluminium and titanium and Alnico is an alloy of nickel, cobalt, iron and aluminiu..

It is interesting to note that atoms of a given atomic number can have different number of neutron..

Question: State the characteristics of a musical note on which its pitch, loudness and quality depend. Answer: The pitch of a musical sound depends on the frequency of the wave. The higher the frequency higher the pitch. The loudness of a musical note depends on its ..

Coal is formed in nature by the 'carbonisation' of wood. Conversion of wood to coal under the influence of high temperature, high pressure, and in the absence of air is termed carbonisatio..

Buffaloes are reared in large numbers in India. There are more than ten different breeds of buffaloes in India. Of them, the high milk yielding breeds a..

Question: Write a short note on the fertility of soil. Answer: The capacity of the soil to sustain the plant life with required nutrients is called the fertility of the soil. The fertility of soil reduces mainly due to soil erosion. When a crop is grown on the same land repeat..

Metals have high density and are very heavy. Iridium and osmium have the highest densities where as lithium has the lowest densit..

Question: State Newland's 'Law of Octaves'. Answer: When elements are arranged in ascending order of their atomic weights, every eighth element had similar physical and chemical properties and resembled the first element just like the eighth note of an octave of music resembles..