States Of Matter(4th Grade > Science ) Questions and Answers

Question 1. Solids always have a rigid structure.
  1.    True
  2.    False
  3.    solution
  4.    molecule
Explanation:-
Answer: Option B. -> False
:
B
Solid can be rigid or compressible. Some solids like sponge or rubber are not rigid and can be easily deformed or stretched.
Question 2. Liquid water + _____ → Water vapour.
  1.    Liquid
  2.    Heat
  3.    Ice
  4.    Dry ice
Explanation:-
Answer: Option B. -> Heat
:
B
When heat is supplied to liquid water it converts to water vapour (gaseous state).
Question 3. Which state of matter is the easiest to compress?
  1.    Plasma
  2.    Gas
  3.    Liquid
  4.    Solid
Explanation:-
Answer: Option B. -> Gas
:
B
Gas particles are loosely packed and have large spaces between them. This means they can be compressed easily.
Question 4. The freezing point of water is ______.
  1.    −100∘C
  2.    100∘C
  3.    −10∘C
  4.    0∘C
Explanation:-
Answer: Option D. -> 0∘C
:
D
The temperature at which a liquid converts to a solid is called its freezing point.
The freezing point of water is 0∘C.
Question 5. Matter occupies space.
  1.    True
  2.    False
Explanation:-
Answer: Option A. -> True
:
A
Matter is anything which has mass and occupies space. It can be felt and sensed by our five senses.
Question 6. Gases have 
  1.    definite shape
  2.    definite size
  3.    indefinite shape
  4.    definite volume
Explanation:-
Answer: Option C. -> indefinite shape
:
C
Gases have indefinite shape and size. Particles of gases move around freely and have very weak forces of attraction between them.
Question 7. __________ is a physical process through which a solid is converted into a liquid.
  1.    Freezing
  2.    Cooling
  3.    Melting
  4.    Condensation
Explanation:-
Answer: Option C. -> Melting
:
C
Melting is a physical process through which a solid is converted into a liquid. When a solid is heated, the distance betweenthe particles increases, forces of attraction decreases. Eventually, the solid converts to liquid.
Question 8. A solution in which no more solute can be dissolved in the given amount of solvent is called as a/an ______ solution.
  1.    unsaturated
  2.    hard
  3.    weak
  4.    saturated
Explanation:-
Answer: Option D. -> saturated
:
D
A saturated solution is a solutionin which no more solute can be dissolvedin solvent withoutheating the solution.
Question 9. When water is kept below its freezing point it turns into 
  1.    liquid
  2.    ice
  3.    steam
  4.    water vapour
Explanation:-
Answer: Option B. -> ice
:
B
When water is below its freezing point, water particles come closer. Their interparticle forces of attraction increases and theyform a rigid structure called ice.
Question 10. Ice + ____ → Liquid water
  1.    Ice
  2.    Heat
  3.    Salt
  4.    Sugar
Explanation:-
Answer: Option B. -> Heat
:
B
When heat is supplied to ice, it converts to liquid water. The process of convertingsolid into liquid by applying heatis known as melting.
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