Science and Technology 10 most important questions for Board exam March 2018.

(i) Give the IUPAC name of the following compounds.

(a) CH3CH2CH2OH

(b) HCOOH

(c) CH3– CH = CH – CH3

(ii) How many pairs of chromosomes are there in human beings?

(iii) Elements in the same group show same valency. Give scientific reason.

(iv)  What is a spectrum? Why do we get a spectrum of seven colours when white light is dispersed by a prism?

(v) Explain the process of fertilisation, development and birth in human beings.

(vi) Which mode of reproduction gives rise to variation? Give the importance of variation in survival of species.

(vii) State four most common electrical appliances based on heating effect of electric current. Why do we use finely heated platinum wire in surgery?

(viii) What major harms are done to human beings due to air pollution?

(ix) Metal A has electronic configuration (2, 8, 1) and metal B has (2, 8, 8, 2). Which is more reactive? Why? Identify these metals. 

(x) Define Heredity. Give two examples.