Can you find the HCF of 1.2 and 0.12? Justify your answer.

Energy from various sources is considered to have been derived from the sun. Do you agree? Justify your answer.

Is the position of a star as seen by us its true position ? Justify your answer.

A silver spoon is kept immersed in an aqueous solution of copper sulphate. What change would you observe in the spoon and in the solution? Justify your answer.

The atomic numbers of two elements are 8 and 16 respectively. Write the electronic configuration of these two elements. Do you keep these two elements in the same group of the modern periodic table? Justify your answer. Find out which of these two elements is more electronegative. Give reason for your answer.

What can you say about the position of the points (5,4) (8,4) (3,4), (0,4), (-4,4), (-2,4)? Locate the points on a graph sheet. Justify your answer.

What is the workdone by the for coincide of gravity on a satellite round the earth? Justify your answer.

Every surd is an irrational, but every irrational need not be a surd. Justify your answer.

Are all the five bonds of PCl_(5) equivalent ? Justify your answer.