5th Science: Science in Everyday Life Term 1 Chapter 4 Questions and Answers

Science in Everyday Life

5th Science | Term 1 Unit 4

Questions with Answers, Solution, Evaluation

Evaluation

I. Choose the correct answer.

1. Blue appearance of the sky is due to__________ of light. a. reflection b. refraction c. interference d. scattering Answer: d. scattering

2. Who is known as Missile Man of India? a. Sir. C.V.Raman b. Dr. A.P.J. Abdul Kalam c. Dr. M.S. Swaminathan d. Ramanujan Answer: b. Dr. A.P.J. Abdul Kalam

3. An example for reversible change is a. melting of ice b. burst of balloon c. burning paper d. change of milk into curd Answer: a. melting of ice

4. Chemical reactions are example for a. reversible change b. irreversible change c. both of them d. none of them Answer: b. irreversible change

5. Which of the following is not an organic waste? a. Flowers b. Vegetables c. Fruits d. Battery Answer: d. Battery

II. Fill in the blanks.

1. The book ‘Wings of fire‛ was written by Dr. A.P.J. Abdul Kalam. 2. A stretched rubber band comes back to normal shape. It is an example for reversible change. 3. Most of the physical changes are reversible changes. 4. News paper is a recyclable waste. 5. Wastes from house and apartments are called household waste.

III. Match the following.

Exercise (Think First):

1. Bud to flower Dr. A.P.J. Abdul Kalam

2. Reversible change Recyclable waste

3. India 2020 Organic waste

4. Paper Melting of ice

5. Vegetables Irreversible change

Answer:
1. Bud to flower - Irreversible change 2. Reversible change- Melting of ice 3. India 2020- Dr. A.P.J. Abdul Kalam 4. Paper - Recyclable waste 5. Vegetables- Organic waste

IV. Circle the odd one.

1. a) Melting b) Freezing c) Boiling d) Cooking 2. a) Boiling b) Burning c) Cooking d) Rusting of iron 3. a) Vegetables b) Flowers c) Fruits d) Chemicals 4. a) Paper b) Glass c) Metals d) Paints

V. Answer briefly.

1. Sky appears blue in colour. Why? Blue is scattered more. Because of this reason, sky appears blue most of the time.

2. What is reversible change? Changes which can be reversed are called reversible changes.

3. Differentiate reversible and irreversible changes. Changes which cannot be reversed are called irreversible changes. If we bum a piece of paper it bums and turns into ash. It cannot become paper again. This is an irreversible change. Changes which can be reversed are called reversible changes. When water is cooled it becomes ice. When ice is heated it becomes water. This is an example for reversible change.

4. What are the different types of wastes? Waste is any substance which is discarded after primary use. It is worthless, defective and of no use. They are unwanted and undesirable materials.

5. Write a note on e-waste. e-wastes: Computer parts, Electronic materials, Cell phone parts, CFL bulbs.

6. Name the scientists from Tamil Nadu?

VI. Answer in detail.

1. Write about different household wastes. Household Wastes: Waste from home is known as household waste. Solid wastes disposed from home and apartments comprise garbage and rubbish (bottles, cans, clothings, composts, disposable items, food packings, news papers, magazines and trimmings). We can classify the household wastes as below.

Organic wastes: Kitchen wastes, Vegetables, Flowers, Leaves, Fruits.
Toxic wastes: Old medicines, Paints, Chemicals, Bulbs, Spray cans, Fertilizers, Pesticide containers, Batteries, Shoe polish.
Recyclable wastes: Paper, Glass, Metals, Plastics.
Solid wastes: Clothes soiled with blood and other body fluids.
e-wastes: Computer parts, Electronic materials, Cell phone parts, CFL bulbs.

2. Expalin the need for waste disposal. To control pollution : Various pollutions like water pollution, air pollution and soil pollution can be avoided.
To conserve natural resources ; Waste disposal is important for the conservation of our environmental resources like forest, minerals and water.
To control spread of diseases : Spread of infectious diseases can be controlled.
Recycle for further use : Wastes can be recycled to get products for further use.

3. How can you reduce wastes in your school environment? (i) A trash can should be kept in each classroom. Students should be advised to drop waste materials only in the trash can.
(ii) Each class should be divided into squads and one squad should take over class cleaning every week.
(iii) Wastes should be seggregated in biodegradable and non biodegradable and kept in appropriate containers.
(iv) A compost pit should be made in a comer of the school garden and biodegradable garbage should be converted into compost.
(v) An awareness should be created among students to keep the classrooms and school campus clean.

Activity 1

Take an elastic band and stretch it to the maximum. Now release it. What do you observe?

Cut it now into pieces. Can you get the band back again?

Answer: NO

Activity 2

Take a balloon and blow air into it. You can see that the shape and size of the balloon is changed. Now let the air escape from the balloon. What do you observe now?

Now blow it to its full size and prick it with the tip of a pin. It is burst. Can you get the balloon back?

Answer: NO

Activity 3

Which of these common changes, you think, can be reversed?

Activity 4

Collect the wastes from your house before it is thrown into dustbin. Separate them into two groups.

Group 1: Garbage from the kitchen like fruit and vegetable peel, egg shells, waste food, tea leaves, news papers, dry leaves and paper bags.

Group 2: Pieces of cloth, polythene bags, brocken glass, aluminum wrappers, nails, old shoes and broken toys.

Find out how you can dispose them properly.

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