34. The following statements are true about colloids EXCEPT.

a. It has the ability to scatter light.
b. The particles move in a haphazard zigzag motion.
c. It appears to be clear in a glass.
d. It has the ability to hold other substances

35. Jonathan wants to separate stones, insects and other unwanted materials in his mixture of grains and com. What technique of separating mixture is appropriate

a. Winnowing
b. physical manipulation
c. filtering
d. magnetism

36. Which of the following mixtures can be separated by handpicking?

a. Sliced fruits
b. nails and water
c. vinegar and oil
d. muddy water

37. Which of the following statements BEST describe sifting or sieving?

a. Sifting/sieving uses a screen material which allows smaller particles to pass through and leaving the larger particles as residue on the screen.
b. Sifting/sieving uses a hand which allows smaller particles to pass through and leaving the larger particles as residue on the screen.
c. Sifting/sieving uses a screen material which allows larger particles to pass through and leaving the smaller particles as residue on the screen.
d. None of the above​