Which of the following will show the Tyndall effect?

Correct answer: (d) More than one of the above

Explanation

The Tyndall effect is the scattering of light by colloidal particles, which makes a beam's path visible.

Milk and starch solution are colloids, so both show it. A dilute solution of NaCl is a true solution with particles too small to scatter light, so it does not. Two options are correct: "More than one of the above".