Here you can find multiple-choice questions (MCQs) for Class 9 science Chapter 2 Is Matter Around Us Pure along with explanations. These MCQs are specifically designed for students studying in Class 9 and follow the CBSE board curriculum. They align with the latest syllabus provided for Class 9 science. By attempting these MCQs, students can efficiently revise the concepts discussed in the chapter and effectively prepare for their Class 9 Annual examinations.
Previously –Â Matter in Our Surroundings Class 9 MCQ
Check chapter-wise science class 9 MCQ – Class 9 Science MCQ
Is Matter Around Us Pure Class 9 Science MCQ
Q.1. Which of the following is an example of a mixture?
a) Pure water
b) Table salt
c) Lemonade
d) Iron filings
Answer
Explanation 💡Â
Lemonade is a mixture as it is made by combining lemon juice, water, and sugar.
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Q.2. What is a solution?
a) A homogeneous mixture of two or more substances
b) A mixture that can be easily separated by filtration
c) A substance made up of only one type of atom
d) A compound made up of two or more elements
Answer
Explanation 💡Â
A solution is a mixture in which the particles of solute are uniformly distributed throughout the solvent.
Q.3. Which of the following is an example of a suspension?
a) Vinegar
b) Air
c) Saltwater
d) Orange juice with pulp
Answer
Explanation 💡Â
Orange juice with pulp is a suspension as the pulp particles are not dissolved but remain suspended in the liquid.
Q.4. What are the properties of a colloid?
a) Fine particles that do not settle down
b) Particles that settle down quickly
c) Particles that dissolve completely in the solvent
d) Homogeneous mixture of two or more substances
Answer
Explanation 💡Â
Colloids have particles that are larger than those in a solution but smaller than those in a suspension. These particles do not settle down and remain dispersed throughout the mixture.
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Q.5. What is a physical change?
a) A change in which new substances are formed
b) A change in which no new substances are formed
c) A change that cannot be reversed
d) A change that requires an input of energy
Answer
Explanation 💡Â
In a physical change, the state or appearance of a substance is altered, but no new substances are formed. The original substance can be recovered through physical means.
Q.6. What are elements?
a) Substances made up of two or more types of atoms chemically combined
b) Pure substances made up of only one type of atom
c) Homogeneous mixtures of two or more substances
d) Heterogeneous mixtures of two or more substances
Answer
Explanation 💡Â
Elements are pure substances that cannot be broken down into simpler substances by chemical means. They are composed of only one type of atom.
Q.7. Which of the following is an example of a compound?
a) Gold
b) Oxygen gas (O2)
c) Carbon
d) Water (H2O)
Answer
Explanation 💡Â
Water is a compound as it is made up of two different elements, hydrogen (H) and oxygen (O), chemically combined.
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Q.8. What is the concentration of a solution?
a) The total mass of solute dissolved in a given volume of solvent
b) The ratio of solute to solvent in a solution
c) The ability of a solution to dissolve more solute
d) The ability of a solution to conduct electricity
Answer
Explanation 💡Â
Concentration refers to the amount of solute present in a given amount of solvent. It is usually expressed as a ratio or percentage.
Q.9. How can you differentiate between a solution and a suspension?
a) By observing whether the mixture is homogeneous or heterogeneous
b) By testing the electrical conductivity of the mixture
c) By measuring the density of the mixture
d) By determining the boiling point of the mixture
Answer
Explanation 💡Â
A solution is a homogeneous mixture where the particles of solute are evenly distributed throughout the solvent. A suspension is a heterogeneous mixture where the particles of the solute are not completely dissolved and can be seen suspended in the solvent.
Q.10.What is a mixture?
a) A substance made up of only one type of atom
b) A compound made up of two or more elements
c) A homogeneous combination of two or more substances
d) A physical combination of two or more substances
Answer
Explanation 💡Â
A mixture is a physical combination of two or more substances that can be separated by physical means. The substances in a mixture retain their individual properties.
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