DAV Class 4 Science Chapter 9 Question Answer – Safe Handling and Storage of Water

The DAV Class 4 Science Book Solutions and DAV Class 4 Science Chapter 9 Question Answer – Safe Handling and Storage of Water are essential study tools for DAV public school students in Class 4.

DAV Class 4 Science Chapter 9 Question Answer – Safe Handling and Storage of Water

DAV Class 4 Science Ch 9 Question Answer – Safe Handling and Storage of Water

Something To Know

A. Fill in the blanks.

Question 1.
Water, which is fit for drinking, is called ______
Answer:
Potable

Question 2.
Groundwater is not fit for dirnking because it contains ______ and ______
Answer:
dirt, germs

Question 3.
______ removes dust from water.
Answer:
filtration

Question 4.
______ and ______ kill germs present in water.
Answer:
boiling, chlorination

Question 5.
Water should always be stored in ______ and ______utensils.
Answer:
clean, covered.

B. Write True or False for the following statements.

1. We should always store drinking water in covered clean containers.
2. We can drink water that has been stored for many days.
3. We need to purify water before drinking it.
4. We can allow water to stagnate around our house.
5. We should use a ladle to take out water from a container.
Answer:
1. We should always store drinking water in covered clean containers. (True)
2. We can drink water that has been stored for many days. (False)
3. We need to purify water before drinking it. (True)
4. We can allow water to stagnate around our house. (False)
5. We should use a ladle to take out water from a container. (True)

C. Tick (✓) the correct option.

1. Germs, present in water, may be killed by
(a) simple filtration
(b) storing it in covered containers
(c) storing it for many days
(d) chlorination
Answer:
(d) chlorination

2. By drinking unclean water, one may get a disease like
(a) malaria
(b) dengue
(c) chikungunya
(d) jaundice
Answer:
(d) jaundice

3. Dust and other suspended particles in unclean water can be removed by
(a) boiling
(b) keeping it in a fridge
(c) filtration
(d) chlorination
Answer:
(c) filtration

4. Our body requires, and uses, water for
(a) breathing
(b) digestion of food
(c) preparation of food
(d) transpiration
Answer:
(b) digestion of food

D. Answer the following Questions in brief.

Question 1.
State the meaning of the term potable water.
Answer:
Water which is clean and fit for drinking is called potable water.

Question 2.
Name any two diseases that can be caused by drinking unclean water. Answer: Jaundice and diarrhea Question 3. Name the diseases which are spread by mosquitoes.
Answer:
Malaria, dengue and chikungunya

Question 4.
How does boiling help in making water safer for drinking?
Answer:
Boiling kills the germs present in water. Thus, boiling helps in making water safer for drinking.

Question 5.
Name two methods of purification of water.
Answer:
Boiling and filtration

Question 6.
State any two ways of safe handling of drinking water.
Answer:
Two methods of safe handling of drinking water are as follows:

• Water should always be stored in clean and covered containers.
• A clean utensil should be used to take out water from containers.

E. Answer the following Questions.

Question 1.
Why should water be purified before drinking?
Answer:
Water may contain germs. Drinking unclean water may cause diseases like cholera, diarrhea and jaundice. Hence, water should be purified before drinking.

Question 2.
What is chlorination? How does it purify water.
Answer:
Adding chlorine to water is called chlorination. Chlorination helps in killing germs in water. Thus chlorination purifies water.

Question 3.
Why is the traditional method of filtration not completely sufficient for making water fit for drinking?
Answer:
Traditional method of filtration only removes dirt from water. It does not kill germs in water. Hence, traditional method of filtration is not completely sufficient for making water fit for drinking.

Question 4.
Why should we not allow water to stagnate around our houses?
Answer:
Mosquitoes breed in stagnant water. So, water should not be allowed to stagnate around our home.

Question 5.
State two ways that can be used to prevent breeding of mosquitoes in room coolers.
Answer:
Two methods to prevent breeding of mosquitoes in room coolers:

• We should change water in room coolers after 3-4 days.
• We can also put two spoons of kerosene in coolers to prevent mosquitoes from breeding.

Value Based Questions

Question 1.
Point out the lack of values displayed by Mr. and Mrs. Chanderkant.
Answer:
Mr. and Mrs. Chanderkant do not maintain cleanliness around their house. They seldom think about public health issues.

Question 2.
State the values displayed by Dr. Narang.
Answer:
Dr. Narang shows concern for public health. He also shows concern for cleanliness in the neighbourhood.

Question 3.
Suggest some ways to ensure that there is no stagnation of water around Mr. Chanderkant’s house.
Answer:
Mr. Chanderkant should make proper drainage which can carry wastewater to the main drain. He should fill all the ditches near his house.

Question 4.
State some other ways to prevent the breeding of mosquitoes.
Answer:
Discarded items should be thrown at the garbage dumping sites. Kerosene oil should be sprinkled in stagnant water. These methods prevent the breeding of mosquitoes.

Something To Do

Question 1.
Draw pictures of different types of containers used for storing water and colour them.
Answer:
Do it yourself.

Question 2.
Find out about symptoms of diseases like malaria, dengue and jaundice.
Answer:
Malaria: High fever and shivering Dengue: High fever, body ache Jaundice: Skin becomes pale, lack of appetite

Question 3.
List the precautions that can be taken to avoid getting the above mentioned diseases.
Answer:
Mosquito breeding should be prevented, mosquito repellants should be used to prevent malaria and dengue. For prevention of jaundice, we should not use contaminated food or water.

Question 4.
Try to set up a ‘traditional filter’ and use it for cleaning dirty water.
Answer:
Do it yourself.

DAV Class 4 Science Chapter 9 Solutions – Safe Handling and Storage of Water

I. Multiple Choice Questions:

1. Which is the most common method of purification of water?
(a) Boiling
(b) Filtration
(c) Chlorination
(d) Cooling
Answer:
(a) Boiling

2. Which purification method does not kill germs in water?
(a) Boiling
(b) Filtration
(c) Chlorination
(d) UV radiation
Answer:
(b) Filtration

3. People in cities usually get water from which of the following?
(a) Groundwater
(b) Lake
(c) Tap
(d) Pond
Answer:
(c) Tap

4. Which of the following breeds in stagnant water?
(a) Cockroach
(b) Flea
(c) Mosquito
(d) Lice
Answer:
(c) Mosquito

5. Which of the following should be put in stagnant water to prevent the breeding of mosquito?
(a) Sugar
(b) Kerosene
(c) Chlorine
(d) Salt
Answer:
(b) Kerosene.

II. Fill in the blanks:

Question 1.
Earthen pots are made from ______
Answer:
Soil

Question 2.
______ filters remove both dirt and germs from water.
Answer:
Modern

Question 3.
Chlorination helps in killing ______
Answer:
Germs

Question 4.
Drinking ______ causes diseases like cholera and jaundice.
Answer:
Contaminated water

Question 5.
We should ______ water before drinking it.
Answer:
Purify.

Question 6.
In villages, people store water in ______ pots.
Answer:
Earthen

III. Write True or False for the following:

1. People in village get water from taps.
2. River water may contain germs.
3. Drinking unclean water causes no harm.
4. Chlorination does not help in killing the germs.
5. Water should be kept in covered containers.
Answer:
1. People in village get water from taps. (False)
2. River water may contain germs. (True)
3. Drinking unclean water causes no harm. (False)
4. Chlorination does not help in killing the germs. (False)
5. Water should be kept in covered containers. (True)

IV. Answer the following Questions in one word:

Question 1.
Which is the most common method of purification of water?
Answer:
Boiling

Question 2.
Malaria is spread by which insect?
Answer:
Mosquito

Question 3.
What is the favourite breeding ground for mosquitoes?
Answer:
Stagnant water

Question 4.
Which method of filtration removes only dirt from water?
Answer:
Filtration

V. Answer the following Questions in brief:

Question 1.
Name some diseases which can happen by drinking contaminated water.
Answer:
Cholera, diarroea and jaundice

Question 2.
What is the need for removing water from coolers after every 3-4 days?
Answer:
We know that mosquitoes breed in stagnant water. If water is not removed from cooler, mosquitoes may breed there. This will increase the risk of malaria and dengue. Hence, it is necessary to remove water from coolers after every 3-4 days.

Question 3.
How is water stored by people in villages and cities?
Answer:
In villages, people store water in earthen pots and containers made from brass or steel. In cities, people store water in plastic containers or metal containers.

Question 4.
Suggest some methods for safe handling of water.
Answer:
Methods of Safe Handling of Water:

• Water should always be stored in clean and covered containers.
• A clean utensil should be used to take out water from containers.
• Never dip your hands in water.
• Do not drink water that has been stored for many days.

DAV Class 4 Science Chapter 9 Notes – Safe Handling and Storage of Water

→ Potable Water: Water which is clean and fit for drinking is called potable water. Groundwater and river water are used by people in most of the villages to obtain water for drinking. In cities, people get water from taps. Groundwater, river water and even tap water may contain germs. This water may not be fit for drinking. Diseases caused by drinking contaminated water: jaundice, diarrhoea, dysentery, cholera, etc.

→ Problems from Stagnant Water: MosQuestion uitoes breed in stagnant water. So, water should not be allowed to stagnate in old, broken containers around our home. We should change water in room coolers after 3-4 days. We can also put two spoons of kerosene in coolers to prevent mosquitoes from breeding.

→ Methods of Purification of Water

• Boiling: This is the most common method of purifying water. Boiling kills the germs present in water.
• Filtration: Filtration helps in removing dust from water. But, filtration does not remove germs. Hence, water should be boiled after filtration. Modem filters remove both dirt and germs from water.
• Chlorination: Adding a small amount of chlorine to water kills the germs. This makes the water fit for drinking.

→ Safe Storage of Water

• Water should be stored properly to keep it clean and safe for drinking.
• In villages, people store water in earthen pots and containers made from brass or steel.
• In cities, people store water in plastic containers or metal containers.

→ Methods of Safe Handling of Water:

• Water should always be stored in clean and covered containers.
• A clean utensil should be used to take out water from containers.
• Never dip your hands in water.
• Do not drink water that has been stored for many days.