The following 20 Multiple Choice Questions (MCQ) are based on
Chapter 9: The Amazing World of Solutes, Solvents, and Solutions from the NCERT Class 8
Science textbook Curiosity. Each question has four options - select the
best answer and click to check.
Instructions: Read each question carefully. Choose the most
appropriate option from (a), (b), (c), or (d). Click
Show Answer to reveal the correct answer with explanation.
Multiple Choice Questions
1A solution is a:
(a) Uniform mixture
(b) Pure element
(c) Non-uniform mixture only
(d) Single particle
(a) is correct
Its components are distributed uniformly at the scale of observation.
2In salt water, salt is the:
(a) Solvent
(b) Solution container
(c) Residue only
(d) Solute
(d) is correct
The solute is the substance that dissolves.
3In salt water, water is the:
(a) Crystal
(b) Gas
(c) Solvent
(d) Solute
(c) is correct
The solvent is the component that dissolves the solute and is usually present in larger amount.
4When two liquids form a solution, the component in larger amount is generally called the:
(a) Impurity
(b) Solvent
(c) Solute
(d) Precipitate
(b) is correct
For miscible liquids, relative amount is commonly used to identify solvent and solute.
5A saturated solution is one that:
(a) Cannot dissolve more solute at the given temperature
(b) Contains no solute
(c) Is always dilute
(d) Can dissolve unlimited solute
(a) is correct
It has reached the solubility limit under the stated conditions.
6An unsaturated solution:
(a) Must contain undissolved solid
(b) Has no solvent
(c) Is a pure compound
(d) Can dissolve more solute at that temperature
(d) is correct
Its dissolved amount is below the maximum possible.
7Solubility is the maximum amount of solute that dissolves in:
(a) No liquid
(b) Only one drop of water
(c) A specified amount of solvent at a specified temperature
(d) Any solvent at any temperature
(c) is correct
Both solvent quantity and temperature are needed when reporting solubility.
8For many solid solutes in water, solubility generally:
(a) Depends only on colour
(b) Increases when temperature rises
(c) Becomes zero on heating
(d) Never changes
(b) is correct
Heating often allows a larger mass of a solid to dissolve, though the amount varies by substance.
9If excess sugar remains at the bottom of tea, one way to dissolve more may be to:
(a) Warm the tea and stir
(b) Add sand
(c) Cool it strongly
(d) Remove all solvent
(a) is correct
Higher temperature and agitation can help when the solubility has not otherwise been exceeded.
10The solubility of gases in water generally:
(a) Always increases on heating
(b) Is independent of temperature
(c) Becomes infinite
(d) Decreases as temperature increases
(d) is correct
Warm liquids usually retain less dissolved gas.
11Why does a cold carbonated drink lose fizz after warming?
(a) Water becomes a solid
(b) Pressure inside becomes irrelevant
(c) Carbon dioxide becomes less soluble and escapes
(d) It produces more dissolved gas
(c) is correct
Gas solubility falls with increasing temperature.
12Increasing pressure above a liquid generally makes a gas:
(a) Lose mass
(b) More soluble
(c) Less soluble in every case
(d) Turn into a solid solute
(b) is correct
Greater gas pressure promotes dissolution, as used in bottling carbonated drinks.
13Density is defined as:
(a) Mass per unit volume
(b) Volume per unit mass
(c) Force per unit area
(d) Distance per unit time
(a) is correct
Density compares how much mass occupies a given volume.
14The SI unit of density is:
(a) N/m2
(b) m/s
(c) J/s
(d) kg/m3
(d) is correct
Using SI mass and volume gives kilograms per cubic metre.
15An object has mass 200 g and volume 100 cm3. Its density is:
(a) 100 g/cm3
(b) 20000 g/cm3
(c) 2 g/cm3
(d) 0.5 g/cm3
(c) is correct
Density = 200/100 = 2 g/cm3.
16An object less dense than water will generally:
(a) Dissolve completely
(b) Float
(c) Sink to the bottom
(d) Lose its mass
(b) is correct
It can displace enough water for buoyancy to balance its weight before complete immersion.
17An object denser than water will generally:
(a) Sink
(b) Float higher
(c) Have zero weight
(d) Become a gas
(a) is correct
When fully immersed, its weight exceeds the buoyant force supplied by the displaced water.
18The volume of an irregular stone can be found using:
(a) A ruler alone for every shape
(b) A thermometer
(c) A spring only
(d) Water displacement
(d) is correct
The rise in water level equals the volume of the submerged stone.
19Most substances expand when heated, so their density generally:
(a) Remains exactly constant
(b) Becomes zero
(c) Decreases
(d) Increases without limit
(c) is correct
Mass stays nearly constant while volume increases.
20Pressure has its greatest effect on the density of:
(a) Light
(b) Gases
(c) Solids
(d) Liquids and solids equally in all cases
(b) is correct
Large interparticle spaces make gases much more compressible than solids or liquids.
What is covered in CBSE Class 8 Science Chapter 9 The Amazing World of Solutes, Solvents, and Solutions?
This chapter covers all key topics from The Amazing World of Solutes, Solvents, and Solutions as per CBSE 2026-27 syllabus.
Is this MCQ Test useful for CBSE board exams?
Yes, designed for CBSE Class 8 board exam preparation covering the complete syllabus.
Are these CBSE Class 8 Science MCQ Test updated for 2026-27?
Yes, all content at eBookPublisher is updated as per the latest 2026-27 CBSE syllabus.
How many chapters are in CBSE Class 8 Science?
All chapters of CBSE Class 8 Science are covered at eBookPublisher with free MCQ Test for each chapter.
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