The Amazing World of Solutes, Solvents, and Solutions Class 8 MCQ Questions Science Chapter 9

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Class 8 The Amazing World of Solutes, Solvents, and Solutions MCQ with Answers

MCQ on The Amazing World of Solutes, Solvents, and Solutions Class 8

Class 8 Science Chapter 9 The Amazing World of Solutes, Solvents, and Solutions MCQ Questions with Answers

Question 1.
What determines whether a solution is considered dilute or concentrated?
(a) The temperature of the solvent.
(b) The amount of solute present in a fixed quantity of solution.
(c) The type of solute.
(d) The pressure applied to the solution.
Answer:
(b) The amount of solute present in a fixed quantity of solution.

Question 2.
Which gas in air is considered as the solvent in the air gaseous solution?
(a) Oxygen
(b) Carbon dioxide
(c) Argon
(d) Nitrogen
Answer:
(d) Nitrogen

Question 3.
Which of the following objects will most likely float in water?
(a) Iron nail
(b) Stone
(c) Wooden stick
(d) Metal coin
Answer:
(c) Wooden stick

Question 4.
As temperature increases, what happens to the density of most substances?
(a) It increases
(b) It stays constant
(c) It decreases
(d) It becomes zero
Answer:
(c) It decreases

Question 5.
Which layer of the Earth is the lightest in terms of density?
(a) Crust
(b) Upper mantle
(c) Outer core
(d) Lower mantle
Answer:
(a) Crust

The Amazing World of Solutes, Solvents, and Solutions Class 8 Assertion-Reason Type Questions

Directions (Q. No. 1 to 5): Each question below consists of an Assertion (A) and a Reason (R).
Use the following key to choose the appropriate answer.
(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.

Question 1.
Assertion (A): Husk particles sink and rice grains float in water.
Reason (R): Husk is less dense than water, while rice is denser than water.
Answer:
(d) A is false but R is true

Question 2.
Assertion (A): Volume should be measured in a single step using an appropriate measuring cylinder.
Reason (R): Measuring volume in more than one step can reduce accuracy.
Answer:
(a) Both A and R are true and R is the correct explanation of A

Question 3.
Assertion (A): Materials become more compact as we move towards the centre of the Earth.
Reason (R): The decreasing pressure and temperature inside the Earth cause the particles of matter to move closer together.
Answer:
(c) A is true but R is false

Question 4.
Assertion (A): Water is heaviest at 4°C.
Reason (R): The density of water is maximum at 4°C.
Answer:
(a) Both A and R are true and R is the correct explanation of A

Question 5.
Assertion (A): The volume of smaller objects is expressed in cubic decimetres (dm³) or cubic centimetres (cm³)
Reason (R): One cubic centimetre is also written as one cc.
Answer:
(b) Both A and R are true but R is not the correct explanation of A

The Amazing World of Solutes, Solvents, and Solutions Class 8 Fill in the blanks

Question 1.
A ……….. is a substance in which solute dissolves.
Answer:
solvent

Question 2.
The SI unit of mass is …………
Answer:
kilogram (kg)

Question 3.
……….. is the curved surface formed by a liquid inside the measuring cylinder.
Answer:
Meniscus

Question 4.
Hot air rises up as it is less ……….. than the cool air around it.
Answer:
dense

Question 5.
……….. is the outermost layer of the Earth.
Answer:
Crust

The Amazing World of Solutes, Solvents, and Solutions Class 8 True or False

Question 1.
Dilute and concentrated are relative terms.
Answer:
True

Question 2.
The SI unit of volume is cubic metre (m³)
Answer:
True

Question 3.
The density of a substance depends on its shape or size.
Answer:
False

Question 4.
The solubility of oxygen decreases in warm water as compared to cold water.
Answer:
True

Question 5.
A mixture of gases in water is a non-uniform mixture.
Answer:
False

Question 6.
The inner core of the Earth has the lowest density.
Answer:
False

The Amazing World of Solutes, Solvents, and Solutions Class 8 Match the following

Question 1.

Column A	Column B
(i) Measuring cylinder	(a) Curved surface of a liquid
(ii) Air	(b) Measures the mass of objects
(iii) Digital weighing balance	(c) A uniform gaseous solution
(iv) Meniscus	(d) Measures the volume of liquids

Answer:

Column A	Column B
(i) Measuring cylinder	(d) Measures the volume of liquids
(ii) Air	(c) A uniform gaseous solution
(iii) Digital weighing balance	(b) Measures the mass of objects
(iv) Meniscus	(a) Curved surface of a liquid

Question 2.

Column A	Column B
(i) Solute	(a) Less solute in solution
(ii) Solvent	(b) No more solute dissolves
(iii) Saturated solution	(c) Salt in water
(iv) Dilute solution	(d) Nitrogen in air

Answer:

Column A	Column B
(i) Solute	(c) Salt in water
(ii) Solvent	(d) Nitrogen in air
(iii) Saturated solution	(b) No more solute dissolves
(iv) Dilute solution	(a) Less solute in solution