Class 9 Chemistry Chapter 1 MCQ: Matter in Our Surroundings MCQs
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Class 9 Chemistry Chapter 1 MCQ: Matter in Our Surroundings MCQs
1. What do you mean by condensation?
a) The process of changing from gas to solid
b) The process of changing from liquid to gas
c) The process of changing from gas to liquid
d) The process of changing from solid to gas
Correct Answer: c) The process of changing from gas to liquid
Explanation: Condensation is the process by which a gas changes into a liquid state.
2. What do you mean by vaporization?
a) The process of changing from gas to solid
b) The process of changing from liquid to gas
c) The process of changing from gas to liquid
d) The process of changing from solid to gas
Correct Answer: b) The process of changing from liquid to gas
Explanation: Vaporization is the process by which a liquid changes into a gas state.
3. Which of the following statements is incorrect about the state of matter?
a) Particles of matter are very close to each other in the solid state.
b) In the gaseous state, particles are very far apart.
c) In the liquid state, particles are arranged in a regular pattern.
d) The state of matter depends on the intermolecular forces between particles.
Correct Answer: c) In the liquid state, particles are arranged in a regular pattern.
Explanation: In the liquid state, particles are close to each other but do not have a regular arrangement.
4. A change of state of matter directly from solid to gas without changing into the liquid state is called:
a) Sublimation
b) Condensation
c) Melting
d) Vaporization
Correct Answer: a) Sublimation
Explanation: Sublimation is the process where a solid changes directly into a gas without passing through the liquid state.
5. Which of the following is not a property of gas?
a) Gases have no definite shape
b) Gases are highly compressible
c) Gases have a fixed volume
d) Gases fill the entire container they are in
Correct Answer: c) Gases have a fixed volume
Explanation: Gases do not have a fixed volume; they expand to fill the entire space available to them.
6. A change of state of matter directly from gas to liquid is called:
a) Evaporation
b) Condensation
c) Sublimation
d) Vaporization
Correct Answer: b) Condensation
Explanation: Condensation is the process by which a gas changes into a liquid state.
7. A form of matter that has no fixed shape but has a fixed volume. An example of this form of matter is:
a) Solid
b) Liquid
c) Gas
d) Plasma
Correct Answer: c) Gas
Explanation: Gases have no fixed shape but have a fixed volume.
8. A change of state of matter directly from liquid to gas is called:
a) Evaporation
b) Condensation
c) Sublimation
d) Vaporization
Correct Answer: a) Evaporation
Explanation: Evaporation is the process by which a liquid changes into a gas state.
9. Which of the following conditions is most favorable for converting gas into liquid?
a) Decreasing temperature and increasing pressure
b) Increasing temperature and decreasing pressure
c) Increasing temperature and increasing pressure
d) Decreasing temperature and decreasing pressure
Correct Answer: a) Decreasing temperature and increasing pressure
Explanation: Cooling the gas and increasing the pressure facilitate the conversion of gas into a liquid.
10. S.I. unit of temperature is –
a) Kelvin
b) Celsius
c) Fahrenheit
d) Joule
Correct Answer: a) Kelvin
Explanation: The International System of Units (SI) unit of temperature is Kelvin (K).
11. The amount of water vapor present in the air is called –
a) Humidity
b) Dew
c) Precipitation
d) Evaporation
Correct Answer: a) Humidity
Explanation: Humidity refers to the amount of water vapor present in the air.
12. What is the full form of CNG?
a) Compressed Natural Gas
b) Condensed Nitrogen Gas
c) Carbonated Natural Gas
d) Compressed Nitrogen Gas
Correct Answer: a) Compressed Natural Gas
Explanation: CNG stands for Compressed Natural Gas, which is used as a fuel for vehicles.
13. What is the full form of LPG?
a) Liquefied Petroleum Gas
b) Liquid Propane Gas
c) Low-Pressure Gas
d) Liquid Petroleum Gas
Correct Answer: a) Liquefied Petroleum Gas
Explanation: LPG stands for Liquefied Petroleum Gas, which is commonly used as a fuel in households.
14. What do you mean by melting point?
a) The temperature at which a solid changes into a liquid
b) The temperature at which a liquid changes into a gas
c) The temperature at which a gas changes into a liquid
d) The temperature at which a solid changes into a gas
Correct Answer: a) The temperature at which a solid changes into a liquid
Explanation: Melting point is the temperature at which a solid substance changes into a liquid state.
15. What do you mean by fusion?
a) The process of changing from gas to solid
b) The process of changing from liquid to gas
c) The process of changing from solid to gas
d) The process of changing from solid to liquid
Correct Answer: d) The process of changing from solid to liquid
Explanation: Fusion is the process of changing from a solid to a liquid state, also known as melting.
16. Which of the following is the smallest unit of matter?
a) Atom
b) Molecule
c) Element
d) Compound
Correct Answer: a) Atom
Explanation: Atoms are the smallest unit of matter that retains the properties of an element.
17. Which of the following is incorrect about plasma?
a) Plasma consists of positively charged ions and free electrons
b) It is the most common state of matter in the universe
c) Plasma does not conduct electricity
d) Plasma is often referred to as the fourth state of matter
Correct Answer: c) Plasma does not conduct electricity
Explanation: Plasma is an excellent conductor of electricity due to the presence of free electrons and ions.
18. The temperature at which a substance changes from a liquid to a gas is called:
a) Melting point
b) Boiling point
c) Freezing point
d) Sublimation point
Correct Answer: b) Boiling point
Explanation: The boiling point is the temperature at which the vapor pressure of the liquid equals the external pressure, resulting in the formation of bubbles throughout the liquid.
19. Under which of the following conditions can we boil water at room temperature?
a) Decreasing the pressure
b) Increasing the pressure
c) Decreasing the temperature
d) Increasing the temperature
Correct Answer: a) Decreasing the pressure
Explanation: Boiling point decreases with a decrease in pressure. Lowering the pressure allows water to boil at lower temperatures, even at room temperature.
20. Which of the following is an example of a physical change?
a) Burning wood
b) Rusting of iron
c) Melting of ice
d) Digestion of food
Correct Answer: c) Melting of ice
Explanation: Melting of ice is a physical change as it involves a change in state from solid to liquid without altering the chemical composition of water molecules.
21. Which of the following does not affect the rate of evaporation?
a) Surface area
b) Temperature
c) Humidity
d) Pressure
Correct Answer: d) Pressure
Explanation: Pressure does not significantly affect the rate of evaporation. The rate of evaporation is primarily influenced by surface area, temperature, and humidity.
22. The interconversion of states of matter is governed by:
a) Avogadro’s law
b) Gay-Lussac’s law
c) Boyle’s law
d) Kinetic theory of matter
Correct Answer: d) Kinetic theory of matter
Explanation: The kinetic theory of matter explains the behavior of particles in different states of matter and how they undergo interconversion under varying conditions.