Chapter 2 PHYSICAL SCIENCE : Is Matter Around Us Pure? — Online MCQ Test
SCIENCE · CLASS 9th · Andhra State Board
Practice Chapter 2 PHYSICAL SCIENCE : Is Matter Around Us Pure? with a free chapter-wise online MCQ test.
This chapter covers: This chapter details mixtures solutions suspensions colloids elements compounds and separation techniques for heterogeneous and homogeneous mixtures..
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Chapter 2 PHYSICAL SCIENCE : Is Matter Around Us Pure? — Important Questions & Answers
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.
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.
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.
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.
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.
True solutions are homogeneous, transparent, and do not scatter light enough to show the Tyndall effect.