Question

q10. an object with a density of 0.4 grams/ml will float in water.(hint: density of water is 1 gram/ml)
true
false
q11. if you mix hot water and cold water, which water floats on top?
hot water
cold water
neither

Explanation:

Step1: Recall density - float rule

Objects with density less than water float.

Step2: Compare densities

Given object density is 0.4 g/mL, water density is 1 g/mL. Since 0.4 < 1, it floats. So Q10 is True.

Step3: Recall density - temperature relationship

Hot water is less dense than cold water. Less - dense substances float on more - dense ones. So hot water floats on cold water in Q11.

Answer:

Q10. A. True
Q11. A. Hot water