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Class 9 Science Chapter 1 Matter in Our Surrounding Quiz 5
Welcome to Quiz 5 on Matter in Our Surroundings! In this Class 9 Science Chapter 1 Matter in Our Surrounding quiz 5, we are going to explore even more about the world of matter. We’ve already covered a lot of ground in Quizzes 1, 2, 3, and 4, and now it’s time to build on that knowledge and dive deeper into new details.
Matter is everything around us—it’s what makes up all the objects and substances we encounter every day. This chapter is really important because it helps us understand the basic nature and behavior of matter. Knowing this foundation will make it easier for you to grasp more complex scientific topics in the future.
In this quiz, we’ll review and expand on what you’ve learned so far. We’ll take a closer look at the different states of matter, how they change, and how matter behaves in different conditions. This deeper understanding will help you connect the dots and see how matter interacts with the world around us.
So, get ready to test your knowledge, think critically, and reinforce everything you’ve learned about matter. It’s going to be an exciting journey into the amazing world of science!
Matter in Our Surroundings Quiz 5: Rules and Structure
Rules
- Time Limit: You have 15 minutes to complete this quiz. Make sure to manage your time effectively.
- Multiple Choices: Each question provides several answer options. Choose the one you believe is correct.
- Single Correct Answer: Each question has only one correct answer. Select the best option based on your knowledge.
- No Negative Marking: There is no penalty for incorrect answers. You will not lose points for choosing an incorrect option.
Structure
- Total Questions: 10
- Covered Topics: This quiz tests your understanding of the core concepts from Chapter 1 of Class 9 Science, “Matter in Our Surroundings.” It includes questions about the states of matter (solid, liquid, gas), their physical properties, the particulate nature of matter, the spaces between particles, and the forces of attraction among them.
Good luck, and use your knowledge of matter to answer the questions.
Class 9 Chemistry Chapter 1 Matter in Our Surrounding Quiz Questions
Question 1: Statement I Rate of chemical reactions depend upon the physical state. Statement II Chemical properties of a substance do not change with Physical state.
a) Both Statement I and Statement II are correct and Statement II is the correct explanation of Statement I.
b) Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I.
c) Statement I is correct but Statement II is incorrect
d) Statement I is incorrect but Statement II is correct.
Answer:
The correct answer is b) Both Statement I and Statement II are correct but Statement II is not the correct explanation of Statement I.
Rate of chemical reactions depend upon the physical state, but chemical properties of a substance do not change with physical state.
Question 2: Thermal energy of a substance is defined as the
I. sum of kinetic energy of the particles.
II. average kinetic energy of the particles.
Select the correct option.
a) Only I
b) Only II
c) Both I and II
d) Neither I nor II
Answer:
The correct answer is b) Only II.
Thermal energy is the measure of average kinetic energy of the particles of matter and is responsible for the movement of particles.
Question 3: Which of the following factors determine the state of a substance?
I. The nature of intermolecular forces of the particles.
II. Molecular interaction between the particles.
III. Thermal energy of the particles.
The correct option is
a) I and II
b) Only III
c) I, II and III
d) Only I
Answer:
The correct answer is c) I, II and III.
The state of a substance is determined by the nature of intermolecular interactions (i.e., intermolecular forces) and thermal energy of the particles.
Question 4: For the gaseous state which of the following is incorrect?
a) Thermal energy = Molecular attraction
b) Thermal energy >> Molecular attraction
c) Thermal energy << Molecular attraction
d) Molecular force >> Attraction in liquid
Answer:
The correct answer is a) Thermal energy = Molecular attraction.
If thermal energy equals molecular attraction, the gas will immediately liquefy. For the gaseous state, molecular force is greater than the attraction in liquids.
Question 5: Is it true that doctors advise to put strips of wet cloth on the forehead of a person having a high temperature?
a) True
b) False
Answer:
The correct answer is a) True.
When wet cloth strips are placed on the forehead of a person with a high fever, the cloth absorbs heat from the forehead, and the evaporation of water helps to reduce body temperature.
Question 6: The property of gas that helps aquatic plants and animals to survive in water is:
a) Vaporization
b) Sublimation
c) Diffusion
d) None
Answer:
The correct answer is c) Diffusion.
Diffusion of respiratory gases like oxygen and carbon dioxide helps aquatic plants and animals breathe in water.
Question 7: In which of the following conditions, the distance between the molecules of hydrogen gas would increase?
a) Increasing pressure on hydrogen contained in a closed container.
b) Some hydrogen gas leaking out of the container.
c) Increasing the volume of the container of hydrogen gas.
d) Adding more hydrogen gas to the container without increasing the volume of the container.
Answer:
The correct answer is c) b and c.
The distance between hydrogen gas molecules increases when some hydrogen gas leaks out of the container or by increasing the volume of the container.
Question 8: Which one of the following is an ideal gas?
a) Hydrogen
b) Nitrogen
c) CO2
d) None of these
Answer:
The correct answer is d) None of these.
No gas perfectly acts as an ideal gas under all conditions. Hydrogen, nitrogen, and CO2 do not fully satisfy all gas laws at all conditions.
Question 9: When an ideal gas undergoes unrestricted expansion
a) cooling occurs because the molecules lie above inversion temperature
b) no cooling occurs as no attractive interactions exist among molecules
c) cooling occurs as molecules collide with each other with loss of energy
d) cooling does not occur as these do work equal to loss in kinetic energy
Answer:
The correct answer is b) no cooling occurs as no attractive interactions exist among molecules.
For an ideal gas undergoing unrestricted expansion, no cooling occurs because there are no attractive interactions between the molecules.
Question 10: The gases become denser at
a) low pressure
b) low temperature
c) high pressure
d) (b) as well as (c)
Answer:
The correct answer is c) high pressure.
Gases become denser at high pressure.
