RBSE Solutions for Class 5 EVS Chapter Chapter 13 Let's Play with Water

Rajasthan Board RBSE Solutions for Class 5 EVS Chapter 13 Let's Play with Water Textbook Exercise Questions and Answers.

RBSE Class 5 EVS Solutions Chapter 13 Let's Play with Water

RBSE Class 5 EVS Let's Play with Water Textbook Questions and Answers

Do the Following Activity

Question 1. 
Take three glasses and fill them upto half with water. In first glass, add half a tea spoonful of salt, in the second glass, add half a teaspoonful of Sugar, in the third glass, add half a teaspoonful of chalk powder and stir. Then wait for some time. When the water gets stable, observe all the glasses carefully. What do you see? Make the table given below in your notebook and write down your observations.

Substances	Soluble in water
Salt	Yes	No
Sugar
Chalk Powder

Answer:

Substances	Soluble in water
Salt	Yes	No
Sugar	Yes Yes -	- - No
Chalk Powder

 

Fast Slow Dissolution

Question 
While drinking milk you must have seen many times that sugar settles down at the bottom of the glass. Why does it happen?
Answer: 
Sugar dissolves slowly, so it doesn’t dissolve completely.

Observe and Write the Answers of the following :

Question 1. 
In which glass a very less quantity of the sugar is visible or not visible at all?
Answer: 
The glass in which the water is stirred with spoon, the sugar is not visible because it has dissolved.

Question 2. 
Why the sugar in another glass was less soluble?
Answer: 
It was less soluble because it was not stirred with spoon.

Question 3. 
Why the sugar in another glass, was soluble at a faster rate?
Answer: 
In another glass solubility rate was faster because sugar was stirred with spoon.

do This Activity :

Question 1.
Take two glasses of water; Fill each of them with an equal quantity of hot and cold water respectively. Put on equal amount of sugar in both the glasses and sir well. Note the total time for the complete dissolution of sugar in both the glasses.
Answer: 
Do you self.

Observe and Five Answers of the following:

Question 1. 
In which glass the sugar dissolves fast and in which one the dissolution is slow?
Answer: 
The glass in which water is warm, the sugar dissolves quickly and in the glass which contains cold water, the dissolution is slow.

Think and Write the Answers of the following :

Question 1. 
By performing all the above activities, what have you understood about the solubility of the substance? Write down in your notebook.
Answer: 
By performing all the above activities, we have understood that when the water is warm or hot and the substance is stirred with spoon, then it dissolves quickly. When the water is cold and is not stirred with spoon, the dissolution is slow.

Do This Activity

Question 1. 
Bring a bucket filled half with water, in your class. Everyone collects a few things together, like a piece of chalk, pen, eraser, a bit of paper, matchstick, sponge, key, coin, a plastic bottle filled with water, etc. Put these things one by one in the bucket water and see which objects floats in water and which sinks?  Make a table in your notebok and write down the observations.
Answer: 

Things that sink in water immediately Key, Coin, Plastic bottle filled with water

Things that float on the surface of water Pen, match, stick, eraser

Things that float initially, but sink later Piece of chalk, sponge, a piece of paper

Points for Discussion :

Question 1. 
In the first chance, does the pen sink?
Answer: 
No.

Question 2. 
When the pen, its refill and its cap were put into the water separately, then, which object floats and which sinks?
Answer: 
Empty pen and cap floated, while the refill sank.

Question 3. 
In which condition, does the empty pen sink? Try to find out, why did this happen?
Answer: 
When the water enters into the pen, and it is filled, it sinks.

Observ and Answer the Following Questions :

Question 1. 
Does the oil dissolve in water?
Answer: 
No.

Question 2. 
Where do we see the oil in water?
Answer: 
The oil is seen on the surface of water.

Question 3. 
You must have seen oil above the surface of cooked vegetables and pulses. Why does it happen?
Answer: 
Because oil is lighter than water and oil is insoluble, so it is seen above the surface of cooked vegetables and pulses which contains oil. 

Points for Discussion

Question 1. 
It is a saying that “Friendship should be like milk and water”. Why it is said so?
Answer: 
“Friendship should be like milk and water”. It is said so because when milk and water are mixed, then they get mixed so perfectly that they cannot be separated. Hence friends should also be of the same quality, only then the friendship can be long lasting.

Explore and Write the Answers of the following:

Question 1. 
Which things weighed in kilogram are brought to your home?
Answer: 
Sugar, Jaggery, Sweets, Vegetables, Peanuts, flour, salt, spices, crushed sugar, etc.

Question 2. 
Which things measured in litre are brought to your home?
Answer: 
Mustard Oil, refined Oil, Kerosene oil, Soyabean Oil, Petrol, Diesel, milk, water etc.

Things to Do

Question 1. 
Take 3-4 different types of empty utensils. Put water from one-liter bottle in each of them and observe how many litres of water gets filled in each utensil?
Answer:

Name of the utensil	How many litres of water gets filled
Jug	1.5 litres
Bucket	12 litres
Pitcher	15 litres
bowl	half litre

Question 2. 
Fill a bucket half with water. Put an all-pin in the water and see what happens? Now put the same all-pin on a piece of newspaper and place it carefully onthe surface of water. Watch it for some time, what happens?
Answer: 
When we put only all-pin in the water, it sank immediately, but when we put it on apiece of newspaper and placed it on the surface of water, it floated, even when the paper soaked water and got submerged. This is because water surface, if not disturbed, behaves like a stretched memberane. 

Do this too

Question 1. 
Write the following objects in the given group on the basis of their characteristics- 

Sugar, salt, bitter gourd, Lemon, Grape, Milk, Yogurt, Boondi Laddo Jalebi, Barfi, Neem Leaves, Myrobailan

Based on teste

Sweet	Sour	Bitter
Sugar, Milk, Boondi Laddu, Jalebi, Barfi	Lemon, Yourt, Grape, Myrobalam	Bittgourd, Neem leaves

Based on color

White	Yellow	Green
Sugar, Salt, Milk, Yogurt, Barfi	Lemon, Grape, Boondi Laddu, Jalebi	Bitter gourd, Neem leaves Myrobalan

Question 2. 
The table given below shows the use of water by a family for various purposes 20 year ago and at present. These approximate figures are also expressed in bar graphs and )ic chart. They are easy to read and understand.

Use	For making food and drinking	For daily work	For	For other works	Total
20 year ago	30%	10%	animals	20%	100%
at Present	40%	40%	40%	10%	100%

Watch and Answer

Question 1. 
According to the bar graph, what percentage of water was used in daily work 20 years ago? And what percentage of water is used at present?
Answer: 
20 years age - 10% At present - 40%

Question 2.
According to the bar graph by what percentage decrease or increase in the use of water for cooking and drinking in 20 years ago and at present?
Answer: 
It has increased 10 percent.

Question 3. 
According to the pie chart, there has been an increase or decrease in the use of water for animals by a family 20 years ago and in the present.
Answer: There is a reduction in the use of wa¬ter for animals at present.

Learnt, Understood, and now tell

Question 1 
Make a table in your notebook and write the names of ten things for each of the following things that dissolve in water, float on the water and sink in water.

Things that dissolve in water	Things that float on water	Things that sink in water

Answer:

Things that dissolve in water	Things that float on water	Things that sink in water
1. Sugar	Pen	All pin
2. Crushed sugar (bura)	Wood	Look
3. Salt	Newspaper	Key
4. Baking Soda	Flower	Brick
5. Alum (fitkari)	Plastic bottle	Small stone
6. Soap	Leaves	Tongs
7. Washing Powder	Plastic toys	Potato
8. Indigo	Boat	Glass pieces
9. Glucose	Sponge	Iron pieces
10. Lemon Juice	Balloon	Mobile '

RBSE Class 5 EVS Let's Play with Water Important Questions and Answers

Objective Type Questions 

Question 1. 
Choose the right option :
(i) Soluble in water-
(a) Wax 
(b) Chalk Powder
(c) Salt 
(d) None of these
Answer:
(c) Salt 

(ii) Floats on the surface of water.
(a) Matchstick 
(b) Key '
(c) Lock 
(d) Coin
Answer: 
(a) Matchstick 

Question 2. 
Fill in the blanks
(a) Water becomes ............. when sugar is added in it.
(b) Dissolved sugar is not ............. in the water
(c) Chalk Powder does not ............. in water.
Answer: 
(a) sweet 
(b) visible 
(c) dissolve.

Question 3. 
Match Table A and Table B 

Table A	Table B
Floating on water	Wax
Dissolution in water	Piece of wood
Sinking in water	Sugar
No dissolution in water	Key

Answer:

Table A	Table B
Floating on water	Piece of wood
Dissolution in water	Sugar
Sinking in water	Key
No dissolution in water	Wax

Very Short Answer Type Questions 

Question 1. 
Is sugar dissolved in water visible? 
Answer: 
No.

Question 2. 
Is chalk power soluble in water? 
Answer: 
No.

Question 3. 
Write the name of two objects that are measured in liters?
Answer: 

1. Milk 
2. Oil

Question 4. 
Name any two things which are weighed in kilogram.
Answer: 

1. Sugar 
2. Wheat.

Question 5. 
Ifa lemon ¡s put in a half-filled glass, then what would happen?
Answer:
The lemon will sink.

Question 6. 
Giving Meena a container, where did her mother send her?
Answer: 
To bring milk.

Question 7. 
How should be the friendship?
Answer: 
Like milk and water.

Question 8. 
How are the liquid things, like water, measured?
Answer: 
In litre.

Short/Long Answer Type Questions

Question 1. 
What should be done to make a lemon float on the surface of water?
Answer:
To make a sunk lemon float, we should put pinch of salt in the water slowly.

Question 2. 
Why does oil not dissolve in water?
Answer: 
Oil, ghee, butter, etc. all the oily things don’t dissolve in water because they are lighter than water. Therefore, they come on the sur¬face of water, and float on.

Question 3. 
Why does the sugar dissolve faster when the water in the glass is stirred?
Answer: 
The sugar dissolves faster when the water in the glass is stirred because the mol¬ecules of the sugar collide with each other. They hit the molecules of water and start breaking up.

Question 4. 
Some substances float on the surface of water, and some substances sink, why does it happen?
Answer: 
When some substances are put in the water, they displace the water equal to their weight. If the weight of the water displaced by the substance is more than the weight of the sub¬stance, then the substance floats, if the weight of the displaced water is less than the weight of the substance, then it sinks. It means we the things denser than water sink in water, whereas things having less density than water float over it.

Question 5. 
Some things (substances) are given below. Separate five things each which float on water and which sink in water.
Stone, piece of glass, piece of wood, paper, coin, bangle, feather, chalk, pencil, leaf.
Answer: 

Things that float on the surface of water	Things that sink in water
piece of wood	stone
feather	piece of glass
paper	coin
pencil	bangle