Test Your Knowledge: Class 8 The Amazing World of Solutes, Solvents, and Solutions MCQs with Solutions
Multiple Choice Questions:
(Choose the correct option and answer is given below each)
1. What is formed when sugar and salt dissolve in water?
A) Non-uniform mixture
B) Suspension
C) Solution
D) Compound
Answer: C) Solution
2. In a solution of salt and water, salt is the —
A) Solvent
B) Solute
C) Gas
D) Concentrate
Answer: B) Solute
3. The liquid that dissolves a solute is called —
A) Mixture
B) Solubility
C) Solvent
D) Solution
Answer: C) Solvent
4. Which of the following is a gaseous solution?
A) Carbon dioxide in water
B) Air
C) Smoke
D) Mist
Answer: B) Air
5. When a solute stops dissolving and settles at the bottom, the solution is —
A) Dilute
B) Unsaturated
C) Saturated
D) Concentrated
Answer: C) Saturated
6. The maximum amount of solute that dissolves in a fixed quantity of solvent is called —
A) Density
B) Concentration
C) Solubility
D) Volume
Answer: C) Solubility
7. What happens to solubility of most solids when temperature increases?
A) Decreases
B) Remains same
C) Increases
D) Becomes zero
Answer: C) Increases
8. What happens to the solubility of gases when temperature increases?
A) Increases
B) Decreases
C) Remains constant
D) Changes to solid
Answer: B) Decreases
9. Which of the following helps aquatic life survive in water?
A) Carbon dioxide
B) Dissolved oxygen
C) Dissolved hydrogen
D) Dissolved nitrogen
Answer: B) Dissolved oxygen
10. Density is defined as —
A) Mass × Volume
B) Volume / Mass
C) Mass / Volume
D) Force × Area
Answer: C) Mass / Volume
More MCQs:
11. SI unit of density is —
A) g/cm³
B) kg/m³
C) g/mL
D) kg/L
Answer: B) kg/m³
12. Which instrument is used to measure mass of an object?
A) Thermometer
B) Balance
C) Barometer
D) Calorimeter
Answer: B) Balance
13. The instrument used to measure volume of a liquid is —
A) Weighing machine
B) Measuring cylinder
C) Beaker
D) Thermometer
Answer: B) Measuring cylinder
14. What shape does the surface of water form in a measuring cylinder?
A) Flat surface
B) Meniscus
C) Concave mirror
D) Convex line
Answer: B) Meniscus
15. The relative density of aluminium with respect to water is —
A) 1.0
B) 2.7
C) 0.5
D) 3.5
Answer: B) 2.7
16. What happens to density when temperature increases?
A) Increases
B) Decreases
C) No change
D) Doubles
Answer: B) Decreases
17. Why does ice float on water?
A) Ice is denser than water
B) Ice is lighter than water
C) Ice dissolves in water
D) Ice has no density
Answer: B) Ice is lighter than water
18. Hot air rises because it is —
A) Denser
B) Less dense
C) Colder
D) Heavier
Answer: B) Less dense
19. In which solution can more solute still dissolve?
A) Saturated
B) Supersaturated
C) Unsaturated
D) Concentrated
Answer: C) Unsaturated
20. What will happen to density if pressure increases on a gas?
A) Decreases
B) Increases
C) Remains constant
D) Becomes zero
Answer: B) Increases
Fill in the Blanks:
21. A uniform mixture of solute and solvent is called a __________.
A) Compound B) Solution C) Suspension D) Solid
Answer: B) Solution
22. In salt solution, water is the __________.
A) Solute B) Solvent C) Solid D) Gas
Answer: B) Solvent
23. The amount of matter in an object is called its __________.
A) Volume B) Mass C) Density D) Weight
Answer: B) Mass
24. The space occupied by an object is its __________.
A) Weight B) Volume C) Area D) Pressure
Answer: B) Volume
25. Density = __________ / Volume.
A) Weight B) Force C) Mass D) Energy
Answer: C) Mass
26. Solubility of solids generally __________ with increase in temperature.
A) Decreases B) Increases C) Stops D) Vanishes
Answer: B) Increases
27. Solubility of gases __________ with increase in temperature.
A) Increases B) Decreases C) Doubles D) Stays same
Answer: B) Decreases
28. The unit of density in SI system is __________.
A) g/mL B) g/cm³ C) kg/m³ D) kg/cm³
Answer: C) kg/m³
29. When water turns into ice, its density __________.
A) Increases B) Decreases C) Remains same D) Doubles
Answer: B) Decreases
30. Ice floats on water because it is __________ than water.
A) Denser B) Lighter C) Heavier D) Solid
Answer: B) Lighter
True or False:
31. Solute is the liquid part of a solution. — False
32. Air is a mixture of gases and is a type of solution. — True
33. A saturated solution can dissolve more solute. — False
34. Density depends on both mass and volume. — True
35. The solubility of gases increases with increase in temperature. — False
36. Water acts as a good solvent. — True
37. Density of a substance increases when temperature decreases. — True
38. Measuring cylinder is used to find mass. — False
39. Ice floats on water because its density is less than that of water. — True
40. Pressure has no effect on gases. — False
Assertion–Reason Questions:
41. Assertion (A): Ice floats on water.
Reason (R): Ice is denser than liquid water.
A) Both A and R are true, and R is the correct explanation of A.
B) Both A and R are true, but R is not the correct explanation of A.
C) A is true, but R is false.
D) A is false, but R is true.
Answer: C) A is true, but R is false.
42. Assertion (A): Density of a gas increases on increasing pressure.
Reason (R): Increasing pressure brings gas particles closer, reducing volume.
A) Both A and R are true, and R is the correct explanation of A.
B) Both A and R are true, but R is not the correct explanation of A.
C) A is true, but R is false.
D) A is false, but R is true.
Answer: A) Both A and R are true, and R is the correct explanation of A.
To Learn more Click Below:
MCQs:
Chapter 1- Exploring the Investigative World of Science – CLICK HERE
Chapter 2- The Invisible Living World: Beyond Our Naked Eye – CLICK HERE
Chapter 3- Health: The Ultimate Treasure – CLICK HERE
Chapter 4-Electricity: Magnetic and Heating Effects – CLICK HERE
Chapter 5- Exploring Forces – CLICK HERE
Chapter 6- Pressure, Winds, Storms, and Cyclones – CLICK HERE