DAV class 4 Science Chapter 9 Solutions

DAV Class 4 Science Chapter 9 Safe handling and storage of water Solutions contain enough material to allow students to establish a solid foundation with the fundamentals of the DAV Class 4 Science Textbook. DAV Class 4 science students who practice Dav Class 4 Science Solutions Question Answer on a regular basis are more likely to do well in their school exams.

DAV CLASS 4 Science Chapter 9 Safe handling and storage of water Question and Answer

A. Fill in the blanks.

A. Fill In the blanks. 1. Water, which is fit for drinking, is called 2. Ground water is not fit for drinking because it contains and 3. removes dust from water. 4 and kill germs present in water. 5. Water should always be stored in and utensils.

B. Write True and 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.

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

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

  1. Dust and other suspended particles present in unclean water can be removed by—(a) boiling (b) keeping it in a fridge
    (c) filtration
    (d) chlorination
  2. Our body requires, and uses, water for—(a) breathing (b) digestion of food (c) preparation of food (d) transpiration

D. Answer the following questions in brief.

1. State the meaning of the term ‘potable water’. 2. Name any two diseases that can be caused by drinking unclean water. 3. Name the diseases which are spread by mosquitoes. 4. How does boiling help in making water safer for drinking? 5. Name two methods of purification of water. 6. State any two ways of safe handling of drinking water.

E. Answer the following questions.

1. Why should water be purified before drinking? 2. What is chlorination? How does it purify water? 3. Why is the traditional method of filtration not completely sufficient kir making water fit for drinking? 4. Why should we not allow water to stagnate around our houses? 5. State two ways that can be used to prevent breeding of mosquitoes in room coolers.

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