States of Matter MCQs

21. The temperature at which liquid turns into gas is called:
A) Freezing point
B) Boiling point
C) Melting point
D) Sublimation point
Answer: B) Boiling point

22. Dry ice undergoes:
A) Melting
B) Sublimation
C) Condensation
D) Freezing
Answer: B) Sublimation

23. Which state is rigid?
A) Gas
B) Liquid
C) Solid
D) Plasma
Answer: C) Solid

24. Diffusion is fastest in:
A) Solid
B) Liquid
C) Gas
D) Plasma
Answer: C) Gas

25. Which state has fixed volume but changes shape?
A) Solid
B) Liquid
C) Gas
D) Plasma
Answer: B) Liquid

26. Liquids take the shape of:
A) Their own structure
B) Container
C) Solid shape
D) Gas shape
Answer: B) Container

27. Which process releases heat?
A) Melting
B) Evaporation
C) Freezing
D) Sublimation
Answer: C) Freezing

28. Which process absorbs heat?
A) Freezing
B) Condensation
C) Melting
D) Deposition
Answer: C) Melting

29. Which state has maximum intermolecular space?
A) Solid
B) Liquid
C) Gas
D) Plasma
Answer: C) Gas

30. Which of the following is an example of plasma?
A) Ice
B) Steam
C) Lightning
D) Water
Answer: C) Lightning