Before going into MCQ questions of Class 9th Chapter 1, Lets have a look at some of the important points covered in the chapter. These points will help students to do a quick revision of the chapter and will also help in solving the questions.
- Everything in the universe is made of matter.
- Matter occupies space and has mass.
- Matter is made up of tiny particles.
- Particles of matter have spaces between them.
- Particles of matter are continuously moving.
- Particles of matter attract each other.
- Matter exists in three states: solid, liquid, and gas.
- Solids have a definite shape and volume.
- Liquids have a definite volume but no definite shape.
- Gases have neither a definite shape nor volume.
- Matter changes state with temperature and pressure changes.
- The melting point of ice is 0°C (273 K).
- The boiling point of water is 100°C (373 K).
- Kelvin is the SI unit of temperature (0°C = 273 K).
- SI units: mass (kg), length (m), volume (m³), pressure (Pa).
30 MCQ Questions for Class 9 Science: Chapter 1 Matter in Our Surroundings
Question 1. What is the boiling point of water?
a) 0°C
b) 100°C
c) 373 K
d) Both b) and c)
Answer:
d) Both b) and c)
Question 2. Which of the following is a physical change?
a) Burning of paper
b) Rusting of iron
c) Melting of ice
d) Cooking of food
Answer:
c) Melting of ice — Melting of ice is a physical change.
Question 3. The process of a solid changing directly to gas is called:
a) Condensation
b) Evaporation
c) Sublimation
d) Deposition
Answer:
c) Sublimation — The process of a solid changing directly to gas is called sublimation.
Question 4. Which of these is not a characteristic of particles of matter?
a) They are very small.
b) They attract each other.
c) They are stationary.
d) They have spaces between them.
Answer:
c) They are stationary
Question 5. What happens to the kinetic energy of particles when the temperature increases?
a) It decreases
b) It remains constant
c) It increases
d) It first increases then decreases
Answer:
c) It increases — The kinetic energy of particles increases when the temperature increases.
Question 6. Which of these substances has the highest density?
a) Water
b) Air
c) Honey
d) Iron
Answer:
d) Iron — Iron has the highest density among the given options.
Question 7. Evaporation of a liquid leads to which of the following effects?
a) Increase in temperature
b) Decrease in temperature
c) No change in temperature
d) Fluctuation in temperature
Answer:
b) Decrease in temperature — Evaporation of a liquid leads to a decrease in temperature.
Question 8. What is the main factor that affects the rate of evaporation?
a) Pressure
b) Volume
c) Temperature
d) Density
Answer:
c) Temperature
Question 9. The melting point of ice is:
a) 100°C
b) 0°C
c) 273 K
d) Both b) and c)
Answer:
d) Both b) and c) — The melting point of ice is 0°C or 273 K.
Question 10. Which of the following is an example of a gaseous state?
a) Sugar
b) Sand
c) Oxygen
d) Ice
Answer:
c) Oxygen
Question 11. At what temperature in the Celsius scale does water boil?
a) 0°C
b) 100°C
c) 373°C
d) 273°C
Answer:
b) 100°C
Question 12. Which process is responsible for the formation of clouds?
a) Sublimation
b) Condensation
c) Evaporation
d) Deposition
Answer:
b) Condensation
Question 13. What is the physical state of water at 25°C?
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer:
b) Liquid
Question 14. What is the SI unit of temperature?
a) Celsius
b) Fahrenheit
c) Kelvin
d) Rankine
Answer:
c) Kelvin
Question 15. What property of particles of matter is affected by an increase in temperature?
a) Color
b) Size
c) Kinetic energy
d) Weight
Answer:
c) Kinetic energy
Question 16. What happens to the kinetic energy of particles when a substance changes from solid to liquid?
a) Decreases
b) Increases
c) Remains the same
d) Becomes zero
Answer:
b) Increases
Question 17. Diffusion is fastest in which state of matter?
a) Solids
b) Liquids
c) Gases
d) Plasma
Answer:
c) Gases
Question 18. What happens to the intermolecular space when a solid melts into a liquid?
a) Increases
b) Decreases
c) Remains the same
d) Becomes zero
Answer:
a) Increases
Question 19. What is the process called when a gas changes directly to a solid?
a) Sublimation
b) Deposition
c) Condensation
d) Evaporation
Answer:
b) Deposition
Question 20. What is latent heat?
a) Heat required to change the temperature of a substance
b) Heat required to change the state of a substance without changing its temperature
c) Heat lost when a substance cools down
d) Heat gained when a substance heats up
Answer:
b) Heat required to change the state of a substance without changing its temperature
Question 21. In the Kelvin scale, the freezing point of water is __________ K.
Fill in the blank.
Answer:
273
Question 22. When a solid turns into a gas upon heating, the process is known as __________.
Fill in the blank.
Answer:
Sublimation
Question 23. __________ is the process where a liquid changes into a gas at a temperature below its boiling point.
Fill in the blank.
Answer:
Evaporation
Question 24. The __________ energy of particles increases with a rise in temperature.
Fill in the blank.
Answer:
Kinetic
Question 25. __________ is the process where gas changes into a liquid.
Fill in the blank.
Answer:
Condensation
Question 26. Diffusion is slower in liquids than in gases. (True/False)
True / False
Answer:
True
Question 27. Water vapor is considered a gas. (True/False)
True / False
Answer:
True
Question 28. Solids have a definite volume but no definite shape. (True/False)
True / False
Answer:
False
Question 29. The boiling point of water is the same as its evaporation point. (True/False)
True / False
Answer:
True
Question 30. At room temperature, the physical state of water is liquid. (True/False)
True / False
Answer:
True
Question on Match the Columns
Unmatched Columns – Questions
| Column A | Column B |
|---|---|
| (i) Kinetic Energy of Particles | (a) Diffusion in liquids |
| (ii) Behavior in Solids | (b) Takes the shape of the container |
| (iii) Characteristics of Liquids | (c) Particles vibrate at fixed positions |
| (iv) Sublimation Process | (d) Increases with temperature |
| (v) Gaseous State | (e) Direct change from solid to gas |
| (vi) Evaporation | (f) Particles move freely and rapidly |
Matched Columns – Answer
| Column A | Column B |
|---|---|
| (i) Kinetic Energy of Particles | (d) Increases with temperature |
| (ii) Behavior in Solids | (c) Particles vibrate at fixed positions |
| (iii) Characteristics of Liquids | (b) Takes the shape of the container |
| (iv) Sublimation Process | (e) Direct change from solid to gas |
| (v) Gaseous State | (f) Particles move freely and rapidly |
| (vi) Evaporation | (a) Diffusion in liquids |
MCQ questions from Exemplar Problems
Question 1. Which one of the following sets of phenomena would increase on raising the temperature?
a) Diffusion, evaporation, compression of gases
b) Evaporation, compression of gases, solubility
c) Evaporation, diffusion, expansion of gases
d) Evaporation, solubility, diffusion, compression of gases
Answer:
c) Evaporation, diffusion, expansion of gases — These increase with higher temperature (compression does not).
Question 2. Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. Help her to identify the correct set of conditions.
a) Low temperature, low pressure
b) High temperature, low pressure
c) Low temperature, high pressure
d) High temperature, high pressure
Answer:
c) Low temperature, high pressure — Cooling and compressing helps gases liquefy.
Question 3. The property to flow is unique to fluids. Which one of the following statements is correct?
a) Only gases behave like fluids
b) Gases and solids behave like fluids
c) Gases and liquids behave like fluids
d) Only liquids are fluids
Answer:
c) Gases and liquids behave like fluids — Both can flow.
Question 4. During summer, water kept in an earthen pot becomes cool because of the phenomenon of
a) diffusion
b) transpiration
c) osmosis
d) evaporation
Answer:
d) evaporation — Water seeps out and evaporates, taking heat away (cooling effect).
Question 5. A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents a correct arrangement?
a) Water, air, wind
b) Air, sugar, oil
c) Oxygen, water, sugar
d) Salt, juice, air
Answer:
c) Oxygen, water, sugar — Gas (least) < liquid < solid (most).
Question 6. On converting 25°C, 38°C and 66°C to kelvin scale, the correct sequence of temperature will be
a) 298 K, 311 K and 339 K
b) 298 K, 300 K and 338 K
c) 273 K, 278 K and 543 K
d) 298 K, 310 K and 338 K
Answer:
a) 298 K, 311 K and 339 K — Add 273 to each °C value.
Question 7. Choose the correct statement of the following
a) Conversion of solid into vapours without passing through the liquid state is called sublimation.
b) Conversion of vapours into solid without passing through the liquid state is called vapourisation.
c) Conversion of vapours into solid without passing through the liquid state is called freezing.
d) Conversion of solid into liquid is called sublimation.
Answer:
a) Conversion of solid into vapours without passing through the liquid state is called sublimation.
Question 8. The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C respectively. Which one of the following correctly represents their boiling points in kelvin scale?
a) 306 K, 329 K, 391 K
b) 308 K, 329 K, 392 K
c) 308 K, 329 K, 391 K
d) 329 K, 392 K, 308 K
Answer:
c) 308 K, 329 K, 391 K — 35+273=308, 56+273=329, 118+273=391.
Question 9. Which condition out of the following will increase the evaporation of water?
a) Increase in temperature of water
b) Decrease in temperature of water
c) Less exposed surface area of water
d) Adding common salt to water
Answer:
a) Increase in temperature of water — Higher temperature increases evaporation rate.
Question 10. In which of the following conditions, the distance between the molecules of hydrogen gas would increase?
(i) Increasing pressure on hydrogen contained in a closed container
(ii) Some hydrogen gas leaking out of the container
(iii) Increasing the volume of the container of hydrogen gas
(iv) Adding more hydrogen gas to the container without increasing the volume of the container
a) (i) and (iii)
b) (i) and (iv)
c) (ii) and (iii)
d) (ii) and (iv)
Answer:
c) (ii) and (iii) — Less gas (leak) or more volume increases spacing between molecules.
