Density & Solubility — Homi Bhabha Class 6 Chemistry MCQs with Solutions
Free Homi Bhabha Class 6 Chemistry Density & Solubility MCQs with step-by-step solutions (10 questions). Part of Properties of Matter & Changes Around Us. Practise online on Prepizo — no login needed.
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Questions with solutions
Q1 — Density & Solubility · easy · theory
A substance that dissolves fully in water is said to be …
A. Soluble in water ✓ Correct
B. A magnet
C. Insoluble in water
D. A gas
Solution: A substance that dissolves in water is called soluble in water.
Q2 — Density & Solubility · easy · theory
Which of these dissolves in water?
A. Sand
B. Chalk powder
C. Cooking oil
D. Sugar ✓ Correct
Solution: Sugar dissolves fully in water, while sand, chalk powder and oil do not.
Q3 — Density & Solubility · easy · theory
Which of these does NOT dissolve in water?
A. Sugar
B. Glucose
C. Sand ✓ Correct
D. Salt
Solution: Sand is insoluble; it does not dissolve in water and settles at the bottom.
Q4 — Density & Solubility · easy · theory
When oil is poured into water, the oil floats on top because oil is …
A. A kind of metal
B. Heavier than water
C. The same weight as water
D. Lighter (less dense) than water ✓ Correct
Solution: Oil is less dense (lighter) than water, so it floats on top of the water.
Q5 — Density & Solubility · medium · theory
An object will float in water if it is …
A. Made of iron
B. More dense than water
C. Less dense than water ✓ Correct
D. Very big in size
Solution: An object less dense than water floats, while one more dense than water sinks.
Q6 — Density & Solubility · medium · numerical
A block has a mass of 20 g and a volume of 10 cm³. What is its density? (density = mass ÷ volume)
A. 0.5 g/cm³
B. 2 g/cm³ ✓ Correct
C. 10 g/cm³
D. 200 g/cm³
Solution: Density = mass ÷ volume = 20 ÷ 10 = 2 g/cm³.
Q7 — Density & Solubility · medium · theory
When salt is fully dissolved in water, the clear mixture that forms is called a …
A. Solid
B. Magnet
C. Solution ✓ Correct
D. Gas
Solution: Salt dissolved in water gives a clear mixture called a solution.
Q8 — Density & Solubility · medium · theory
Which of these will sink when dropped into a glass of water?
A. A plastic ball
B. A piece of thermocol
C. An iron nail ✓ Correct
D. A dry cork
Solution: An iron nail is denser than water, so it sinks; the others are less dense and float.
Q9 — Density & Solubility · hard · numerical
A stone has a mass of 50 g and a volume of 25 cm³. Water has a density of 1 g/cm³. Will the stone float or sink?
A. It floats, because its density is 0.5 g/cm³
B. It floats, because its density is 2 g/cm³
C. It sinks, because its density (2 g/cm³) is more than water ✓ Correct
D. It stays in the middle of the water
Solution: Density = 50 ÷ 25 = 2 g/cm³, which is more than water’s 1 g/cm³, so the stone sinks.
Q10 — Density & Solubility · hard · theory
Sugar dissolves faster in a glass of hot water than in cold water. This is because …
A. Cold water already has sugar in it
B. Sugar dissolves faster in warmer water ✓ Correct
C. Sugar cannot dissolve in cold water at all
D. Hot water is much heavier
Solution: Warming the water makes sugar dissolve faster than it does in cold water.