Which of the following will show the "Tyndall effect"?

What is meant by concentration of a solution?

Colloidal solution appears to be homogeneous but actually it is heterogeneous. Give justification for this statement.

During an experiment, students were asked to prepare a $10\%$ (mass/mass) solution of sugar in water. Ramesh dissolved $10\,g$ of sugar in $100\,g$ of water, while Sarika prepared it by dissolving $10\,g$ of sugar in water to make $100\,g$ of the solution.
$(a)$ Are the two solutions of the same concentration?
$(b)$ Compare the mass percentage of the two solutions.

You are given two samples of water labelled as $A$ and $B$. Sample $A$ boils at $100\,^{\circ}C$ and sample $B$ boils at $102\,^{\circ}C$. Which sample of water will not freeze at $0\,^{\circ}C$? Comment.

How much water should be added to $15 \, g$ of salt to obtain a $15 \%$ salt solution (in $, g$)?