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Practice each question, then open the answer or worked solution.
Question: 11
Then how much water does Leela’s bottle hold?
Answer: We know 1000 mL = 1 L
Big bottle’s capacity = 1000 mL
Leela uses the small bottle 5 times to fill the big bottle.
Small bottle’s capacity = 1000 / 5
= 200 mL
Hence, Leela’s bottle holds 200 mL of water.
Question: 12
Answer: Ramu takes 2 empty bottles, one bottle measuring 250 mL coconut oil bottle and another bottle of large size. He fills the 250 mL bottle with water and pours the water into the big bottle. By measuring, he will mark the level as 250 mL in the big bottle. Now again, he repeats this process and marks the level as 500 mL. Again he fills the 250 mL bottle and marks the level as 750 mL. He repeats the same process, and now he marks the level as 1 litre. By doing so, Ramu got the measuring bottle with clear markings on it.
NCERT book Page No: 76
My Measuring Bottle
Question: 13
Find your own way to make a bottle which can measure 200 mL, 400 mL, 600 mL, 800 mL and 1 litre. Discuss with your friends and teacher how you made this.
Answer: Take a big bottle and a small bottle measuring 200 mL
Now, fill the 200 mL bottle with water and pour the entire water into the big bottle. Mark the water level in the big bottle as 200 mL
Again fill the small bottle with water and pour the water into the big bottle. Mark the water level as 400 mL in the big bottle
Again fill the water in the small bottle and pour it into the big bottle. Mark the water level as 600 mL in the big bottle
Again fill the water in the 200 mL bottle and pour it into the big bottle. Mark the water level as 800 mL in the big bottle.
Again fill the water in the 200 mL bottle and pour into the big bottle. Mark the water level as 1000 mL or 1 litre in the big bottle
In this way, you can prepare your own measuring bottle
Guess and check
Question: 14
Look at the buckets, mugs, glasses and other things in your house. Guess how much water each can hold. Check if your guess is right by using your measuring bottle.
| Item | My guess | My measure |
| Small bucket | 6 L | 6 L |
| Big bucket | 15 L | 13 L |
| Small mug | 250 mL | 250 mL |
| Big mug | 1 L | 950 mL |
| Small glass | 300 mL | 300 mL |
| Big glass | 600 L | 550 mL |
NCERT book Page No: 77
Question: 15
Neetu has to take 3 injections in a day for 5 days. One injection gives 5 mL of the medicine to your body.
(a) How much medicine will she need for one day?
(b) How much medicine in all for 5 days?
(a) One injection quantity = 5 mL of medicine
She has to take 3 injections in a day = 5 mL × 3
= 15 mL of medicine
Hence, for one day, she needs 15 mL of medicine.
(b) Quantity of medicine she is getting in a day = 15 mL
Quantity of medicine for 5 days = 15 mL × 5
= 75 mL
Therefore, she needs 75 mL of medicine in 5 days.
Question: 16
How much do we use at a time?
* Eye drops We use less than 1 mL at a time
* _________ ______________________
* _________ ______________________
* _________ ______________________
* _________ ______________________
| Eye drops | We use less than 500 mL at a time |
| Injection | We use less than 9 mL at a time |
| Tea | We use less than 150 mL at a time |
| Water | We use less than 250 mL at a time |
| Milk | We use less than 250 mL at a time |
Question: 17
List things we use more than one litre at a time.
* Water for taking a bath
* _____________
* _____________
* _____________
* Water for taking a bath
* Water for washing a four wheeler
* Water for cleaning kitchen utensils
* Water for washing clothes
NCERT book Page No: 78
Question: 18
Amina’s water bottle holds one litre of water. She drank 250 mL of water and her friend Govind drank 150 mL. How much water is left in her bottle?
Answer: Total water Amina’s bottle holds = 1 litre = 1000 mL
Total water drank = water drunk by Amina + water drunk by Govind
= 250 mL + 150 mL
= 400 mL
Water left in Amina’s bottle = 1000 mL – 400 mL
= 600 mL
Therefore, water left in Amina’s bottle is 600 mL
Question: 19
Yusuf runs a tea shop. For making a glass of tea he uses 20 mL of milk. Yesterday he made 100 glasses of tea. How much milk did he use?
Answer: Milk used for making one glass of tea = 20 mL
So, for making 100 glasses of teas, milk used = 20 mL × 100
= 2000 mL
Radha’s grandma was ill. The doctor gave her a bottle with 200 mL of medicine. She has to take the medicine every morning for 10 days.
Question: 20
How many millilitres of medicine does she have to take every morning?
Answer: Quantity of medicine Radha’s grandma has to take for 10 days = 200 mL
Medicine taken by her in a day = 200 / 10
= 20 mL
Hence, Radha’s grandma has to take 20 mL every morning
NCERT book Page No: 79
Water-Water
The table shows the water used in one day by a family of 5 people. They live in Goodallur village.
