Ch-1 Matter In Our Surroundings

Question 1

What is the main focus of Chapter 1 in NCERT Class 9 Science?

Answer 1

The main focus is on Matter in Our Surroundings.

Question 2

True or False: Matter is anything that has mass and occupies space.

Answer 2

True

Question 3

Fill in the blank: The three states of matter are _____, _____, and _____.

Answer 3

solid, liquid, gas

Question 4

What property distinguishes solids from liquids?

Answer 4

Solids have a definite shape and volume.

Question 5

Which state of matter has a fixed volume but takes the shape of its container?

Answer 5

Liquid

Question 6

What is the term for the process of a solid turning into a gas without becoming a liquid?

Answer 6

Sublimation

Question 7

What is the main characteristic of gases?

Answer 7

Gases have neither a definite shape nor a definite volume.

Question 8

Multiple Choice: Which of the following is NOT a state of matter? A) Solid B) Liquid C) Plasma D) Gel

Answer 8

D) Gel

Question 9

What happens to the particles in a solid when it is heated?

Answer 9

The particles gain energy and vibrate more, which can lead to melting.

Question 10

True or False: All substances can exist in all three states of matter.

Answer 10

False

Question 11

What is the process called when a liquid turns into a gas?

Answer 11

Evaporation

Question 12

Fill in the blank: The temperature at which a solid becomes a liquid is called its _____ point.

Answer 12

melting

Question 13

What do we call the change of state from gas to liquid?

Answer 13

Condensation

Question 14

Multiple Choice: Which state of matter has particles that are tightly packed? A) Gas B) Liquid C) Solid D) Plasma

Answer 14

C) Solid

Question 15

What is the term for the amount of space an object occupies?

Answer 15

Volume

Question 16

True or False: Plasma is a state of matter found only in laboratories.

Answer 16

False

Question 17

What is the change of state from liquid to solid called?

Answer 17

Freezing

Question 18

Fill in the blank: In gases, the intermolecular forces are _____ compared to solids and liquids.

Answer 18

weak

Question 19

What is the process of changing a gas directly into a solid called?

Answer 19

Deposition

Question 20

Multiple Choice: Which of the following has the highest energy? A) Solid B) Liquid C) Gas D) None of the above

Answer 20

C) Gas

Question 21

What is the main factor that affects the state of matter?

Answer 21

Temperature and pressure

Question 22

True or False: The volume of a gas is fixed.

Answer 22

False

Question 23

What happens to the particle movement in a substance as it is heated?

Answer 23

The particle movement increases.

Question 24

Fill in the blank: Matter is classified into pure substances and _____ substances.

Answer 24

mixtures

Question 25

What do we call a mixture that has a uniform composition?

Answer 25

Homogeneous mixture

Question 26

Multiple Choice: Which of the following is a characteristic of liquids? A) Definite shape B) Definite volume C) Compressible D) None of the above

Answer 26

B) Definite volume

Question 27

True or False: All gases are compressible.

Answer 27

True

Question 28

What is a common example of sublimation?

Answer 28

Dry ice turning into carbon dioxide gas.

Question 29

Fill in the blank: The process of a liquid becoming a solid is known as _____ .

Answer 29

freezing

Question 30

What is the term for the mixture of two or more substances that can be separated by physical means?

Answer 30

Mixture

Question 31

Multiple Choice: Which state of matter has the least energy? A) Solid B) Liquid C) Gas D) Plasma

Answer 31

A) Solid

Question 32

What is the boiling point of water at sea level?

Answer 32

100 degrees Celsius

Question 33

True or False: Solids can flow like liquids.

Answer 33

False

Question 34

What is the term for the amount of matter in an object?

Answer 34

Mass

Question 35

Fill in the blank: The state of matter that takes both the shape and volume of its container is _____.

Answer 35

gas