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Class 9 Science Chapter 2 Is Matter Around Us Pure Quiz 4
Welcome to Quiz 4 of Class 9 Science Chapter 2 – Is Matter Around Us Pure! In this quiz, we’ll continue to build upon everything you’ve learned in the previous quizzes about matter and its composition. This time, we will focus on testing your deeper understanding and your ability to apply the knowledge gained in Quizzes 1, 2, and 3.
Throughout Chapter 2, we’ve explored how matter is classified into pure substances like elements and compounds, and mixtures, which can be either homogeneous or heterogeneous. This quiz will push you further, challenging your grasp on these concepts and offering a chance to solidify your foundation in chemistry.
Let’s dive into Quiz 4 and see how well you’ve understood the various forms of matter. It’s the perfect way to review your progress, enhance your learning, and build more confidence in the subject!
Class 9 Science Chapter 2 Is Matter Around Us Pure Quiz 4 Rules
- Time Limit: You have 15 minutes to complete the quiz. Be sure to manage your time effectively.
- Multiple Choices: Each question provides several answer options. Pick the one that seems correct based on your knowledge.
- Single Correct Answer: Every question has only one correct answer. Choose the best option you think is right.
- No Negative Marking: There’s no penalty for wrong answers, so feel free to take a guess if you’re unsure. You won’t lose any points for incorrect answers.
Class 9 Science Chapter 2 Is Matter Around Us Pure Quiz 4 Structure
- Total Questions: 10
- Topics Covered: This quiz focuses on the key concepts from Chapter 2, “Is Matter Around Us Pure.” It includes questions on the classification of matter, the difference between pure substances and mixtures, methods of separation, and the distinction between homogeneous and heterogeneous mixtures.
Good luck! Use your knowledge to answer confidently and continue strengthening your understanding of matter.
Class 9 Chemistry Chapter 2 Is Matter Around Us Pure Quiz Questions
Question 1: Milk is a type of
a) True solution
b) Colloid
c) Suspension
d) Saturated solution
Answer:
The correct answer is b) Colloid.
Milk is a colloidal solution where fat and protein particles are dissolved in water. The particles are not visible to the naked eye but can scatter light, which makes milk a heterogeneous mixture despite appearing homogeneous.
Question 2: What is the size of particles of blood?
a) Smaller than 1 nm
b) 1 nm to 100 nm
c) 100 nm to 500 nm
d) Greater than 500 nm
Answer:
The correct answer is b) 1 nm to 100 nm.
Blood is a colloidal solution where the particles range in size between 1 nm and 100 nm. These particles, such as blood cells, nutrients, and minerals, are dissolved in plasma and scatter light.
Question 3: Which of the following is not an example of a liquid solution?
a) Solution of ethanol and water
b) Solution of glucose in water
c) Oxygen dissolved in water
d) Solution of chloroform dissolved in nitrogen gas
Answer:
The correct answer is d) Solution of chloroform dissolved in nitrogen gas.
A liquid solution has a liquid solvent. Chloroform dissolved in nitrogen gas forms a gaseous solution, not a liquid solution.
Question 4: Which of the following is an example of a solid-solid colloid?
a) Cheese
b) Clouds
c) Milk of magnesia
d) Coloured gemstone
Answer:
The correct answer is d) Coloured gemstone.
A solid-solid colloid is a mixture where both the dispersed phase and the dispersing medium are solid. Coloured gemstones are an example of this.
Question 5: Camphor in nitrogen gas is an example of
a) Solid in gas solution
b) Liquid in gas solution
c) Gas in solid solution
d) Gas in liquid solution
Answer:
The correct answer is a) Solid in gas solution.
In this solution, camphor is a solid solute that dissolves in nitrogen gas, forming a solid in gas solution.
Question 6: Which of the following is not true about colloidal solutions?
a) Blood is a colloidal solution
b) The components of a colloidal solution can be separated by centrifugation
c) The components of a colloidal solution can be separated by filtration
d) Their particles do not settle down when left undisturbed
Answer:
The correct answer is c) The components of a colloidal solution can be separated by filtration.
Colloidal particles are too small to be separated by filtration, but they can be separated by centrifugation.
Question 7: The scattering of light by colloidal particles is known as
a) Tyndall effect
b) Reflection
c) Refraction
d) None of the above
Answer:
The correct answer is a) Tyndall effect.
The Tyndall effect occurs when light is scattered by colloidal particles that are large enough to cause this phenomenon.
Question 8: Why does air in a room show the Tyndall effect?
a) Because air in the room behaves as a true solution
b) Because air in the room behaves as a saturated solution
c) Because air in the room behaves as a suspension
d) Because air in the room behaves as a colloidal solution
Answer:
The correct answer is d) Because air in the room behaves as a colloidal solution.
Air contains dust particles and smoke that scatter light, making it act like a colloidal solution and display the Tyndall effect.
Question 9: On the basis of physical states of solute and solvent particles, solutions are divided into how many categories?
a) 1
b) 2
c) 3
d) 4
Answer:
The correct answer is c) 3.
Solutions are classified into three categories based on the physical states of solute and solvent: solid solutions, liquid solutions, and gaseous solutions.
Question 10: The scattering of light by colloidal particles is known as
a) Tyndall effect
b) Reflection
c) Refraction
d) None of the above
Answer:
The correct answer is a) Tyndall effect.
When colloidal particles scatter light, this is called the Tyndall effect.
