MCQs
1. What are the three main states of matter?
a) Solid, Liquid, Energy
b) Solid, Gas, Plasma
c) Solid, Liquid, Gas
d) Liquid, Plasma, Gas
Answer: c) Solid, Liquid, Gas
2. Which state of matter has a fixed shape?
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer: a) Solid
3. Which state of matter flows and takes the shape of its container?
a) Solid
b) Liquid
c) Gas
d) None of the above
Answer: b) Liquid
4. In which state of matter are particles packed closely together?
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer: a) Solid
5. What happens to most solids when heated?
a) They shrink
b) They melt
c) They evaporate
d) They freeze
Answer: b) They melt
6. Which state of matter has no fixed shape and no fixed volume?
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer: c) Gas
7. Ice changing into water is an example of:
a) Freezing
b) Melting
c) Evaporation
d) Condensation
Answer: b) Melting
8. Water turning into steam is called:
a) Freezing
b) Melting
c) Evaporation
d) Condensation
Answer: c) Evaporation
9. Which of these is an example of a solid?
a) Milk
b) Oxygen
c) Brick
d) Water
Answer: c) Brick
10. What do you call the process of water vapor turning back into liquid water?
a) Condensation
b) Evaporation
c) Freezing
d) Melting
Answer: a) Condensation
11. What is the process of changing a gas into a solid called?
a) Sublimation
b) Freezing
c) Deposition
d) Melting
Answer: c) Deposition
12. Which of the following is NOT a property of gases?
a) They flow
b) They have a fixed shape
c) They spread easily
d) They have no fixed volume
Answer: b) They have a fixed shape
13. What happens to the particles of matter when heated?
a) They move slower
b) They stay in place
c) They move faster
d) They stop moving
Answer: c) They move faster
14. Which state of matter has the most energy?
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer: d) Plasma
15. What is the term for the change from a solid directly to a gas?
a) Sublimation
b) Melting
c) Freezing
d) Condensation
Answer: a) Sublimation
16. Which of these objects is an example of a liquid?
a) Stone
b) Juice
c) Balloon
d) Ice
Answer: b) Juice
17. What is the boiling point of water at sea level?
a) 0°C
b) 50°C
c) 100°C
d) 200°C
Answer: c) 100°C
18. What is the freezing point of water?
a) 0°C
b) 50°C
c) 100°C
d) -10°C
Answer: a) 0°C
19. Which of these gases is necessary for humans to breathe?
a) Oxygen
b) Nitrogen
c) Carbon dioxide
d) Helium
Answer: a) Oxygen
20. Clouds are made of:
a) Ice cubes
b) Water vapor
c) Dust only
d) Liquid water droplets
Answer: d) Liquid water droplets
21. Which of the following is an example of matter?
a) Sound
b) Air
c) Light
d) Heat
Answer: b) Air
22. What happens to water when it freezes?
a) It becomes a gas
b) It becomes a solid
c) It evaporates
d) It expands
Answer: b) It becomes a solid
23. Which state of matter is compressible?
a) Solid
b) Liquid
c) Gas
d) All of these
Answer: c) Gas
24. What is dry ice made of?
a) Water
b) Solid carbon dioxide
c) Nitrogen
d) Ice and salt
Answer: b) Solid carbon dioxide
25. When a solid changes into a liquid, the process is called:
a) Freezing
b) Melting
c) Boiling
d) Evaporation
Answer: b) Melting
26. Which state of matter expands the most when heated?
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer: c) Gas
27. What keeps a solid in its shape?
a) The fixed arrangement of its particles
b) The high energy of its particles
c) Its ability to flow
d) Its temperature
Answer: a) The fixed arrangement of its particles
28. Which state of matter can fill the entire space of a container?
a) Solid
b) Liquid
c) Gas
d) None of these
Answer: c) Gas
29. What process changes a liquid to a solid?
a) Melting
b) Freezing
c) Boiling
d) Evaporation
Answer: b) Freezing
30. Which of these is not a property of liquids?
a) Definite shape
b) Can flow
c) Takes the shape of the container
d) Has a fixed volume
Answer: a) Definite shape
31. Which gas is used to fill balloons to make them float?
a) Oxygen
b) Helium
c) Nitrogen
d) Carbon dioxide
Answer: b) Helium
32. When ice melts, it becomes:
a) Water vapor
b) Liquid water
c) A gas
d) A solid
Answer: b) Liquid water
33. Which state of matter cannot be poured?
a) Solid
b) Liquid
c) Gas
d) None of these
Answer: a) Solid
34. What is the process called when water boils and changes into steam?
a) Freezing
b) Melting
c) Evaporation
d) Condensation
Answer: c) Evaporation
35. Which of these is an example of a gas?
a) Stone
b) Water
c) Air
d) Ice
Answer: c) Air
36. What is the scientific term for water in its gas form?
a) Water vapor
b) Dew
c) Ice
d) Liquid water
Answer: a) Water vapor
37. What is the process of changing from a liquid to a gas called?
a) Evaporation
b) Freezing
c) Condensation
d) Sublimation
Answer: a) Evaporation
38. Which of these materials is the best example of a solid?
a) Juice
b) Brick
c) Steam
d) Oil
Answer: b) Brick
39. Which state of matter has particles that are farthest apart?
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer: c) Gas
40. What happens when a gas is cooled?
a) It becomes a solid
b) It becomes a liquid
c) It expands
d) It disappears
Answer: b) It becomes a liquid
41. When you leave a wet cloth to dry, the water disappears. What is this process called?
a) Freezing
b) Condensation
c) Evaporation
d) Melting
Answer: c) Evaporation
42. Which of these is the hardest to compress?
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer: a) Solid
43. Steam is an example of:
a) A solid
b) A liquid
c) A gas
d) A mixture
Answer: c) A gas
44. What is the process called when a gas changes to a liquid?
a) Freezing
b) Condensation
c) Melting
d) Sublimation
Answer: b) Condensation
45. What is the main component of air?
a) Oxygen
b) Hydrogen
c) Nitrogen
d) Carbon dioxide
Answer: c) Nitrogen
46. Which state of matter is usually the lightest?
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer: c) Gas
47. Water droplets forming on the outside of a cold glass is an example of:
a) Evaporation
b) Condensation
c) Freezing
d) Sublimation
Answer: b) Condensation
48. Which of these is an example of sublimation?
a) Ice melting
b) Dry ice turning into gas
c) Water boiling
d) Snow melting
Answer: b) Dry ice turning into gas
49. Which of the following expands the least when heated?
a) Solid
b) Liquid
c) Gas
d) Plasma
Answer: a) Solid
50. What happens when a liquid is cooled?
a) It turns into gas
b) It turns into a solid
c) It evaporates
d) It stays as a liquid
Answer: b) It turns into a solid
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