Solids Worksheet Solutions - Class 5 Science - PDF FREE Download

Q1: Fill in the Blanks.
(i) Matter is made up of molecules that are very_____(large/small).
Ans: small 

(ii) In the case of solids, there is _____(no/some) space between molecules.  
Ans: no 

(iii) Copper sulphate crystals are _____ (solids/liquids).
Ans: solids

(iv) Solids and _____ (gases/liquids) have fixed volume.
Ans: liquids 

(v) Solute and _____ (gas/solvent) makes a solution.
Ans: solvent
Q2: Match the following.

Ans:
1 - (iii)

2 - (v)

3 - (iv)

4 - (ii)

5 - (i)

Q3: True or False.

(i) Air is a mixture of several gases such as nitrogen, oxygen, carbon dioxide, etc
Ans: True
Explanation: Air is made up of many gases mixed together, mainly nitrogen and oxygen, with small amounts of carbon dioxide and other gases.

(ii) Air contains dust particles and smoke.
Ans: True
Explanation: Small solid particles like dust and smoke float in air and are carried by it.

(iii) Oxygen is taken in by green plants to prepare food.
Ans: False
Explanation: Green plants take in carbon dioxide to make food by photosynthesis and release oxygen as a by-product.

(iv) Nitrogen in air controls the process of burning.
Ans: False
Explanation: Burning needs oxygen; nitrogen does not support burning and does not control it.

(v) Air has no weight.
Ans: False 
Explanation: Air has weight and exerts pressure; for example, a barometer shows changes in air pressure caused by the weight of air.

(vi) A gentle wind is called gale.
Ans: False 
Explanation: A gale is a very strong wind; a gentle wind is called a breeze.

(vii) The land breeze takes place during daytime.
Ans: False 
Explanation: A land breeze occurs at night when the land cools faster than the sea and air moves from land to sea.

(viii) Summer monsoon wind brings rain in India.
Ans: True
Explanation: Summer monsoon winds blow from the sea towards the land bringing moisture that causes heavy rainfall in India.

Q4: Short Answers Questions.

(i) Is the arrangement of all molecules in all states of matter the same?
Ans: No. In solids, the molecules are very tightly packed in an ordered arrangement. In liquids, the molecules are less closely packed and can move around each other. In gases, the molecules are far apart and move freely in all directions.

(ii) Name the state of matter in which molecules are very loosely packed.
Ans: In gases, the molecules are very loosely packed and move freely.

(iii) What is a solution? Give two examples.
Ans: A solution is a mixture in which one substance (solute) dissolves evenly in another (solvent) so that the mixture looks uniform. Example: sugar dissolved in water, salt dissolved in water.

(iv) What are soluble and insoluble substances in a liquid?
Ans: Substances that dissolve completely in a liquid to form a uniform mixture are called soluble. For example: salt and sugar are soluble in water. Substances that do not dissolve and remain separate are called insoluble. For example: oil, sand and chalk do not dissolve in water.

(v) Why is distilled water not suitable for drinking?
Ans: Distilled water is not suitable for regular drinking because it has no dissolved minerals such as calcium and magnesium that are normally present in drinking water.

(vi) Define filtration with the help of an example.
Ans: Filtration is the process of separating insoluble solid particles from a liquid by passing the mixture through a filter. Example: To remove sand from impure water, pour the water through filter paper placed in a funnel; the sand stays on the paper while clear water (filtrate) collects below.

(vii) What are the different properties of air?
Ans: The different properties of air are:

• Air occupies space.
• Air exerts pressure.
• Air is needed for burning.
• Air has weight.

Q5: Long Answers Questions. 
(i) Write three properties each of solids, liquids, and gases.
Ans: Three properties each of solids, liquids, and gases are:
Solids:

• Solids have a definite shape.
• Solids have a definite volume.
• Solids have a definite mass.

Liquids: 

• Liquids do not have a fixed shape; they take the shape of the container.
• Liquids have a definite volume.
• Liquids have a definite mass.

Gases: 

• Gases do not have a fixed shape or fixed volume.
• The molecules in gases are very loosely packed and move freely.
• Gases have mass and can exert pressure.

(ii) Write an activity to identify soluble and insoluble substances in water. 
Ans: Take two clear glasses of water. Put a spoonful of sugar into the first glass and stir until it mixes. Put a spoonful of sand into the second glass and stir. Observe after some time:
• The sugar will dissolve and the water will look clear - sugar is soluble in water.
• The sand will settle at the bottom and the water will remain cloudy - sand is insoluble in water.

(iii) Explain two methods to separate soluble substances.
Ans: We can separate a soluble substance from a liquid by the following methods:

• Boiling: Heat the solution so that the liquid evaporates. When all the liquid has evaporated, the dissolved solid remains behind. Example: Heating a sugar solution will leave sugar crystals after the water evaporates.
• Distillation: Heat the solution to boil the liquid, collect the vapour and condense it back into liquid. The collected liquid (distillate) is free of the dissolved substance. Distillation is used to obtain pure water (distilled water).

(iv) How is the sea and land breeze formed?
Ans: Sea breeze forms during the daytime. The land heats up faster than the sea, so the air above the land becomes warmer and rises. Cooler air from above the sea moves in to replace it, creating a breeze from sea to land called sea breeze.
A land breeze forms at night. The land cools faster than the sea, so the air above the sea stays warmer and rises. Cooler air from the land moves toward the sea to fill the space, creating a breeze from land to sea called land breeze.

(v) What are monsoon winds? How are they helpful to us?
Ans: Monsoon winds are seasonal winds that change direction with the seasons. In summer, moist winds blow from the sea towards the land and bring heavy rain. These rains are very important for agriculture and water supply, so monsoon winds are helpful because they provide the seasonal rainfall needed for crops and water resources.