Heredity and Evolution — Science STD 10 — Question

Which of the two is scattered more easily: light of shorter wavelengths or light of longer wavelengths?

Name any two defects of vision which can be corrected by using spectacles.

Name the substance whose build up in the muscles during vigorous physical exercise may cause cramps.

When you smell a favourite food your mouth begins to water (that is, you secrete saliva). Write down what the following are examples of:
The cells in your nasal passages which perceive the smell.

Which of the following produces more heat (per unit mass) on burning?
Coal or LPG

Translate the following statements into chemical equations and then balance the equations:
Aluminium metal replaces iron from ferric oxide, FeO , giving aluminium oxide and iron.

What type of chemical reactions take place when:
Silver bromide is exposed to sunlight?

Name the hardest natural substance known.

A ray of light passes from air into a block of glass. Does it bend towards the normal or away from it?