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

Can you say that salt is a liquid on the basis of change in its shape? Justify your answer. Take a sponge. Observe its shape.

Let ** be the binary operation on the set {1,2,3,4,5} defined a"*" b = H.C.F of a and b Is the operation ** same as the operation ** defined in Exercise 4 above ? Justify your answer .

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

Is ** defined on the set {1,2,3,4,5} by a"*"b = L.C.M. of a and b a binary operation ? Justify your answer.

What is the work done by the force of gravity on a satellite moving round the earth? Justify your answer.