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Class 9 Science Chapter 1 Matter in Our Surrounding Quiz 4
Welcome to Quiz 4 on Matter in Our Surroundings. In this quiz for class 9 Science chapter 1 Matter in Our Surrounding, we’ll dive deeper into the fascinating world of matter. If you’ve been with us for Quizzes 1, 2, and 3, you already have a solid foundation of what matter is and its different forms. Now, we’re going to build on that knowledge and explore even more exciting details.
In this chapter, we’ll focus on understanding the nature and behavior of matter in more depth. Matter is all around us; it makes up everything we see, touch, and interact with. From the air we breathe to the water we drink, and the objects we use every day, matter is everywhere. Understanding matter is crucial because it forms the basis for many other scientific topics you’ll study later.
By taking this quiz, you’ll test and strengthen your understanding of matter. We’ll look at how matter behaves, its different states, and why these properties are important. This knowledge will not only help you grasp the basics but also prepare you for more complex scientific concepts in the future.
So, get ready to put your knowledge to the test, have some fun, and discover more about the amazing world of matter. Let’s get started!
Quiz Rules
- Time Duration: You will have 15 minutes to complete this quiz.
- Answer Options: Each question will provide multiple-choice answers.
- Single Correct Choice: Only one answer is correct for each question.
- No Penalty: There is no negative marking for incorrect answers, so feel free to attempt all questions.
Quiz Structure
- Total Number of Questions: 10
- Topics Covered: This quiz will assess your understanding of the key concepts from Chapter 4 Matter in Our Surroundings. You will explore advanced details about the nature and behavior of matter, including its properties, different states, and the effects of physical factors like temperature and pressure. The questions will challenge you to apply and deepen your knowledge from the previous quizzes and expand your grasp of how matter interacts in various conditions.
Class 9 Chemistry Chapter 1 Matter in Our Surrounding Quiz Questions
Question 1: What is the temperature of water in kelvin at 0°C?
a) 274
b) 273
c) 277
d) 275
Answer:
The correct answer is b) 273.
To convert Celsius to Kelvin, we use the formula: K = °C + 273. So for water at 0°C: 0 + 273 = 273 K.
Question 2: Why do we get the smell of perfume even when we are sitting several meters away?
a) Particles of matter are constant.
b) Particles of matter are always in continuous motion.
c) Particles of matter are attracting each other.
d) Particles of matter collide with each other.
Answer:
The correct answer is b) Particles of matter are always in continuous motion.
When we spray perfume, its gaseous molecules disperse in the air with continuous movement, allowing us to smell it even from a distance.
Question 3: Which of the following has the least density?
a) Chalk
b) Air
c) Water
d) Cotton
Answer:
The correct answer is b) Air.
The density of air is the least among the given options, as density is defined as mass per unit volume.
Question 4: The density of gases is
a) Maximum
b) Minimum
c) Medium
d) None of these
Answer:
The correct answer is b) Minimum.
The order of density is: solids > liquids > gases, with gases having the minimum density.
Question 5: The type of interaction when polar molecules are very close together is ____?
a) Dipole-Dipole
b) London dispersion
c) Ion-dipole
d) All
Answer:
The correct answer is a) Dipole-Dipole.
Dipole-dipole interactions occur when polar molecules are very close, typically at low temperatures.
Question 6: The melting point of four substances is given in brackets. The attraction forces in a solid are more in the case of
a) Ice (273 K)
b) NaF (1270 K)
c) Phosphorus (317 K)
d) Naphthalein (353 K)
Answer:
The correct answer is b) NaF (1270 K).
NaF has the highest melting point, indicating the strongest ionic bonds and highest lattice energy among the options.
Question 7: The molecular interactions responsible for hydrogen bonding in HF are
a) Ion-induced dipole
b) Dipole-dipole
c) Ion-dipole
d) Dipole-induced dipole
Answer:
The correct answer is b) Dipole-dipole.
Hydrogen bonds form through dipole-dipole interactions between highly electronegative atoms like fluorine and hydrogen.
Question 8: The molecular interactions responsible for hydrogen bonding are
a) Ion-induced dipole
b) Dipole-dipole
c) Dipole-induced dipole
d) Ion-dipole
Answer:
The correct answer is b) Dipole-dipole.
Hydrogen bonding occurs between a highly electronegative atom (like fluorine) and a hydrogen atom via dipole-dipole interactions.
Question 9: The relative strength of interionic/intermolecular forces in decreasing order is:
a) Ion-dipole > dipole-dipole > ion-ion
b) Dipole-dipole > ion-dipole > ion-ion
c) Ion-ion > ion-dipole > dipole-dipole
d) Ion-dipole > ion-ion > dipole-dipole
Answer:
The correct answer is c) Ion-ion > ion-dipole > dipole-dipole.
Ion-ion interactions are the strongest, followed by ion-dipole, and dipole-dipole interactions are the weakest among the options.
Question 10: The predominant intermolecular forces present in ethyl acetate, a liquid, are:
a) London dispersion, dipole-dipole and hydrogen bonding
b) Dipole-dipole and hydrogen bonding
c) Hydrogen bonding and London dispersion
d) London dispersion and dipole-dipole
Answer:
The correct answer is d) London dispersion and dipole-dipole.
The relative order of intermolecular forces is: Dipole-dipole > dipole-induced dipole > London dispersion forces. In ethyl acetate, dipole-dipole interactions are the primary forces, while London dispersion forces are secondary.
