Chapter Exam

Chapter 2 PHYSICAL SCIENCE : Is Matter Around Us Pure? — Online MCQ Test

Q: What is a pure substance?

Answer: A. A substance made of only one kind of particles — A pure substance consists of only one kind of particles and has fixed composition. Elements and compounds are pure substances.

Q: Which of the following is a homogeneous mixture?

Answer: B. Salt in water — Salt dissolved in water forms a solution, which is a homogeneous mixture with uniform composition throughout.

Q: A solution is formed when a solute is dissolved in a:

Answer: B. Solvent — In a solution, the substance that gets dissolved is called the solute and the medium in which it dissolves is the solvent.

Q: A mixture contains common salt, sand, and water. Which sequence is correct to separate all components?

Answer: B. Filtration followed by evaporation — First filter to remove sand, then evaporate the filtrate to obtain salt from the salt solution.

SCIENCE · CLASS 9th · Andhra State Board

Practice Chapter 2 PHYSICAL SCIENCE : Is Matter Around Us Pure? with a free chapter-wise online MCQ test for Andhra State Board CLASS 9th SCIENCE. This chapter covers: This chapter details mixtures solutions suspensions colloids elements compounds and separation techniques for heterogeneous and homogeneous mixtures.. AI-generated questions from basic to board-exam level, with instant results and explanations.

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Chapter 2 PHYSICAL SCIENCE : Is Matter Around Us Pure? — Important Questions & Answers (FAQ)

Frequently asked questions from Andhra State Board CLASS 9th SCIENCE — Chapter 2 PHYSICAL SCIENCE : Is Matter Around Us Pure?, with answers and explanations. These are sample questions; the exam has its own separate question set.

What is a pure substance?

A. A substance made of only one kind of particles ✓
B. A substance made of two or more kinds of particles
C. A substance that can be separated by filtration
D. A substance that is always a liquid

Answer: A. A substance made of only one kind of particles
A pure substance consists of only one kind of particles and has fixed composition. Elements and compounds are pure substances.

Which of the following is a homogeneous mixture?

A. Sand in water
B. Salt in water ✓
C. Oil and water
D. Mud in water

Answer: B. Salt in water
Salt dissolved in water forms a solution, which is a homogeneous mixture with uniform composition throughout.

A solution is formed when a solute is dissolved in a:

A. Gas only
B. Solvent ✓
C. Precipitate
D. Residue

Answer: B. Solvent
In a solution, the substance that gets dissolved is called the solute and the medium in which it dissolves is the solvent.

A mixture contains common salt, sand, and water. Which sequence is correct to separate all components?

A. Evaporation followed by filtration
B. Filtration followed by evaporation ✓
C. Sublimation followed by decantation
D. Chromatography followed by distillation

Answer: B. Filtration followed by evaporation
First filter to remove sand, then evaporate the filtrate to obtain salt from the salt solution.

Which of the following statements about a true solution is correct?

A. It scatters light strongly
B. Its solute particles can be seen with the naked eye
C. It is transparent and does not show Tyndall effect ✓
D. It can be separated easily by ordinary filtration

Answer: C. It is transparent and does not show Tyndall effect
True solutions are homogeneous, transparent, and do not scatter light enough to show the Tyndall effect.

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