The DAV Class 5 Science Solutions and DAV Class 5 Science Chapter 8 Question Answer – Properties of Water are essential study tools for DAV public school students in Class 5.
DAV Class 5 Science Chapter 8 Question Answer – Properties of Water
DAV Class 5 Science Ch 8 Question Answer – Properties of Water
Something To Know
A. Fill in the blanks.
Question 1.
A substance which dissolves completely in a liquid is said to be ______ in it.
Answer:
soluble
Question 2.
Answer:
solute
Question 3.
Mustard oil is ______ in water.
Answer:
insoluble
Question 4.
Aquatic animals breathe the ______ gas dissolved in water.
Answer:
oxygen
Question 5.
Change of a liquid into its vapour form is called ______
Answer:
vapourisation
Question 6.
Condensation is the process of change of vapours into ______
Answer:
liquid.
B. Write True or False for the following statements.
1. Sugar and salt are soluble in water.
2. Hair oil is insoluble in water.
3. Pebbles float on water.
4. Sand sinks in water.
5. Water vapours can be changed into liquid water by heating.
Answer:
1. Sugar and salt are soluble in water. (True)
2. Hair oil is insoluble in water. (True)
3. Pebbles float on water. (False)
4. Sand sinks in water. (True)
5. Water vapours can be changed into liquid water by heating. (False)
C. Tick ( ✓) the correct option.
1. In a solution of sugar and water
(a) water is the solute
(b) sugar is the solvent
(c) both water and sugar are solutes
(d) water is the solvent
Answer:
(d) water is the solvent
2. When sand is mixed with water, it
(a) dissolves and floats on water
(b) does dissolve but floats on water
(c) does not dissolve but sinks in water
(d) dissolves and sinks in water
Answer:
(c) does not dissolve but sinks in water
3. Wet clothes get dried due to
(a) water cycle
(b) evaporation
(c) respiration
(d) condensation
Answer:
(b) evaporation
4. Mixture of sugar, salt and lemon juice in water is a
(a) solution
(b) solvent
(c) solute
(d) floating mixture
Answer:
(a) solution.
D. Answer the following Questions in brief.
Question 1.
Define a solution.
Answer:
A mixture in which one substance is completely dissolved in another substance is called a solution.
Question 2.
What is a solvent?
Answer:
A medium in which a substance is dissolved is called a solvent.
Question 3.
Name two substances that are soluble in water.
Answer:
Salt and sugar
Question 4.
Name two substances that are insoluble in water.
Answer:
Sand and chalk
Question 5.
Write the names of four substances that float on water.
Answer:
Cork, wood, paper, rubber
Question 6.
Name the three forms of water.
Answer:
Ice, water and vapour
E. Answer the following Questions.
Question 1.
Give two examples each of:
(a) liquids which dissolve in water.
Answer:
Vinegar and lemon juice
(b) liquids which are insoluble in water.
Answer:
Kerosene oil and mustard oil
(c) solids which float on water.
Answer:
Cork and wood
(d) solids which sink in water.
Answer:
Iron and stone
Question 2.
What do we understand by the terms ‘evaporation’ and ‘condensation’?
Answer:
Conversion of liquid into vapour at all temperatures is called evaporation. Conversion of vapour into liquid is called condensation.
Question 3.
How are clouds formed?
Answer:
Water from oceans, seas, rivers and lakes keep on changing into vapour because of heat from the sun. The vapour rises up in the sky. When the water vapour goes very high in the sky, it forms clouds because of condensation.
Question 4.
How does rain water get impure?
Answer:
Raindrops are the purest form of water. But while reaching the earth, impurities get mixed with raindrops. Thus, rainwater gets impure.
Question 5.
Draw a diagram showing the water cycle.
Answer:
Value Based Questions
Question 1.
In the solution prepared by Anant, name the solutes and the solvent.
Answer:
Sugar, salt and lemon juice are solutes; while water is the solvent.
Question 2.
If the glass tumbler, containing the cold lemonade, is kept on the table for some time, what change will be observed?
Answer:
After some time, the cold lemonade will not remain cold. Its temperature will be same as that of room temperature. We will be also able to see small droplets of water outside the tumbler due to condensation.
Question 3.
State the values displayed by Anant.
Answer:
Anant washes his hand, before helping
his mother. This shows his concern for cleanliness. He has a helping attitude towards his mother.
Question 4.
Share your experiences, of having helped someone, with your friends.
Answer:
Once my mother was not feeling well. I decided to help her in cooking. She gave instructions to chop vegetables, to prepare rice and vegetable curry. I followed all those instructions and made a good meal. My mother appreciated what I did. I felt deeply satisfied.
Something To Do
Question 1.
The window panes of a closed car, with people sitting inside, often get foggy in winter. Find out the reason for this observation.
Answer:
When people are sitting inside, the temperature inside the car is more than the temperature outside the car. When people breathe out, some water vapour also comes out from their lungs. This water vapour gets condensed because of low temperature outside the car. The condensed vapour makes the glass panes foggy.
Question 2.
Perform the following experiments and discuss the observations in the class with your teacher. Also, draw your own conclusion about the properties of water. (NOTE: Refer to experiments I and II in the textbook on page 85).
Answer:
Explanation for Experiment I: After dissolving a particular amount of sugar, no more sugar can be dissolved in water. This happens because there is no room for more sugar. Such a solution is called a concentrated solution. When water is heated, it can dissolve more sugar. This shows that with increase in temperature solubility of a solute increases.
Explanation for Experiment II: Eraser, wood shaving, ice cube, cooking oil and cork float on water, but chalk piece, marble and a five rupee coin sink in water. All the materials except ice cube are insoluble in water.
3. Fill the boxes with suitable words on the basis of the clues given below:
Across:
2. A sweet substance that is soluble in water.
4. A liQuestion uid that is soluble in water.
Down:
1. These sink in water
3. A grey substance that does not dissolve in water and sinks in it.
Answer:
DAV Class 5 Science Chapter 8 Solutions – Properties of Water
I. Multiple Choice Questions
1. Which of the following is soluble in water?
(a) Sand
(b) Stone
(c) Salt
(d) Clay
Answer:
(c) Salt
2. Which of the following is insoluble in water?
(a) Sugar
(b) Lemon juice
(c) Vinegar
(d) Mustard oil
Answer:
(d) Mustard oil
3. Clothes dry because of which process?
(a) Evaporation
(b) Condensation
(c) Freezing
(d) Melting
Answer:
(a) Evaporation
4. Which is the universal solvent?
(a) Vinegar
(b) Water
(c) Kerosene oil
(d) Mustard oil
Answer:
(b) Water
II. Fill in The Blanks
Question 1.
______ can dissolve most of the substances in it.
Answer:
water
Question 2.
Stone does not float but ______ in water.
Answer:
sink
Question 3.
Cork does not sink but ______ on water.
Answer:
float
Question 4.
Oil is ______ in water, but vinegar is soluble in water.
Answer:
insoluble.
III. Define the Following
Question 1.
Solution
Answer:
A mixture of solute and solvent is called solution.
Question 2.
Solvent
Answer:
A medium in which another substance is dissolved is called a solvent.
Question 3.
Solute
Answer:
A substance which gets dissolved in a medium to form a solution is called a solute.
Question 4.
Evaporation
Answer:
Change of water into vapour at normal temperature is called evaporation.
Question 5.
Condensation
Answer:
Change of vapour into liquid is called condensation.
IV. Answer the Following Questions in Brief
Question 1.
What is the difference between a solute and a solvent in the same mixture?
Answer:
In a given mixture, the quantity of solvent is the maximum but the quantity of solute is always less than that of solvent.
Question 2.
What do you understand by physical states of water?
Answer:
Water is found in all the three physical states in nature. Ice is the solid form of water, normal water is in liquid form and water vapour is the gaseous form of water.
Question 3.
Explain water cycle.
Answer:
The cyclic process of evaporation and condensation of water is called water cycle. Water cycle maintains the flow of water on the earth.