5th Science Guide Term 1 Lesson 4 Science In Everyday Life

5th Science Solutions Term 1 Chapter 4 Science In Everyday Life

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5th Science Guide Term 1 Lesson 4 Science In Everyday Life

I. Choose the correct Answer:

1. Blue appearance of the sky is due to ________ of light.

1. a) reflection
2. b) refraction
3. c) interference

d)scattering

Answer:d) scattering

2. Who is known as Missile Man of India?

1. a) Sir CM. Raman
2. b) Dr. A.P.J. Abdul Kalam
3. c) Dr. M.S. Swaminathan

d)Ramanujan

Answer:b) Dr. A.P.J. Abdul Kalam

3. An example for reversible change is ________.

1. a) melting of ice
2. b) burst of balloon
3. c) burning paper
4. d) change of milk into curd

Answer:a) Melting of ice

4. Chemical reactions are example for ________ .

1. a) reversible change
2. b) irreversible change
3. c) both of them
4. d) none of them

Answer:b) Irreversible change

5. Which of the following is not an organic waste?

1. a) Flowers
2. b) Vegetables
3. c) Fruits
4. d) Battery

Answer:d) Battery

II. Fill in the blanks:

1. The book Wings of fire was written by _______.

Answer:Dr. A.P.J. Abdul Kalam

2. A stretched rubber band comes back to normal shape. It is an example for _______.

Answer:Reversible changes

3. Most of the physical changes are _______ changes.

Answer:Reversible changes

4. Newspaper is a _______ waste.

Answer:Recyclable waste

5. Wastes from house and apartments are called _______ waste.

Answer:Household

 

III. Match the following:

Answer:

1. e
2. d
3. a
4. b
5. c

IV.Circle the odd one:

Question 1.

1. a) Melting
2. b) Freezing
3. c) Boiling
4. d) Cooking

Answer:d) Cooking

Question 2.

1. a) Boiling
2. b) Burning
3. c) Cooking
4. d) Rusting of Iron

Answer:a) Boiling

Question 3.

1. a) Vegetables
2. b) Flowers
3. c) Fruits
4. d) Chemicals

Answer:d) Chemicals

Question 4.

1. a) Paper
2. b) Glass
3. c) Metals
4. d) Paints

Answer:a) Paper

V. Answer in brief:

1. Sky appears blue in colour. Why?

Answer:

The sunlight is scattered by the gases and particles present in the air. The white light we see is composed of different colours such as violet, indigo, blue, green, yellow, orange and red (VIBGYOR). Among. these colours, blue is scattered more. Because of this reason, sky appears blue most of the time.

2. What is reversible change?

Answer:

Changes which can be reversed are called reversible change.

Eg: melting of ice.

3. Differentiate reversible and irreversible changes.

Answer:

Reversible Change	Irreversible Change
A substance can turn to its original state.	A substance cannot change to its original state.
The chemical properties of the substance do not change.	The chemical properties of the substance will change.
Most of the physical changes are reversible.	All chemical changes are irreversible.

4. What are the different types of waste?

Answer:

Wastes are of two types, they are;

• Household wastes.
• Wastes from school.

5. Write a note on e-waste.

Answer:

e – wastes are electronic waste of computer parts, electronic materials, cell phone parts, CFL bulb. Every year 40 million tons of electronic waste is generated world wide, e-waste comprises 70% of our overall toxic waste. e-waste contains hundreds of substances, of which many are toxic.

6. Name the scientists from Tamil Nadu.

Answer:

• Dr M.S. Swaminathan.
• Venkataraman Radhakrishnan.
• C.V. Raman.
• Srinivasa Ramanujan.
• A.P.J. Adbul Kalam.

 

VI. Answer in detail:

1. Write about different household wastes.

Answer:

Different types of household wastes are :

1. a) Organic waste: Kitchen wastes, vegetables, flowers, leaves, fruits.
2. b) Toxic wastes: Old medicines, paints, chemicals, bulbs, spray cans, fertilizers, pesticides, containers, batteries, shoe polish.
3. c) Recyclable wastes: Paper, glass, metals, plastics.
4. d) Solid wastes: Cloths soiled with blood and other body fluids.
5. e) e-wastes: Computer parts, electronic materials, cell phone parts, CFL bulbs.

2. Explain the need for waste disposal.

Answer:

Waste management is needed for the following reasons.

1. a) To control pollution: Various pollution like water pollution, air pollution and soil pollution can be avoided.
2. b) To conserve natural resources: Waste disposal is important for the conservation of our environmental resources like forest, minerals and water.
3. c) To control spread of diseases: Spread of infectious diseases can be controlled.
4. d) Recycle for further use: Wastes can be recycled to get products for further use.

3. How can you reduce waste in your school environment?

Answer:

The following practices will helpful to reduce wastes in school environment.

• Use reusable and recyclable bags and containers.
• Avoid one-time use items and use items which can be used permanently.
• Segregate wastes into bio-degradable and non-biodegradable items and hand over them to the municipal and corporation people who collect them.
• Do not throw away your wastes everywhere, put them in dustbins and dispose of them properly.
• Don’t waste food. Waste food in schools can be collected and used to feed cattle.
• Organic wastes can be converted into manures.

5th Science Guide Science In Everyday Life Additional Questions and Answers

I. Choose the Correct Answer:

1. Which among the following is the toxic waste?

1. a) Vegetable waste
2. b) Old medicines
3. c) Kitchen waste
4. d) Leaves waste

Answer:b) Old medicines

2. Which is reversible change?

1. a) Raw egg to boiled egg
2. b) Ice cube to water
3. c) Burning paper
4. d) All the above

Answer:b) Ice cube to water

3. Who is referred as the people’s president?

1. a) Sir C.V.Raman
2. b) Ram Nath Kovoind
3. c) A.P.J.Abdul Kalam
4. d) None of the above

Answer:c) A.P.J.Abdul Kalam

4. Sir C.V.Raman won the Nobel prize for his work in _______.

1. a) Green revolution
2. b) Composite numbers
3. c) Structure of ribosome
4. d) Scattering of light

Answer:d) Scattering of light

5. National Science Day is celebrated on _______.

1. a) 27th February
2. b) 28th February
3. c) 28th March
4. d) 27th March

Answer:b) 28th February

 

II. Fill in the blanks:

1. Water changes into ice on cooling is an example of ________.

Answer:Reversible change

2. change is the _______ of a substance from one form to another.

Answer:Transition

3. A.P.J Abdul Kalam was an _______.

Answer:Aeronautical Scientist.

4. Changes which cannot be reversed are called _______.

Answer:Irreversible changes

5. Most of the physical changes are _______ change.

Answer:Reversible

6. Dissolving sugar in water is a _______ change.

Answer:Reversible

7. Paper, LPG, CNG petrol etc, are _____ substances.

Answer:Inflammable

8. Water on _______ changes to ice and on _______ comes back to water.

Answer:cooling, heating

 

III. Pick out the odd one out:

Question 1.

1. a) Kitchen waste
2. b) Vegetables

c)Flowers

d)Fertilizers

Answer:d) Fertilizers

Question 2.

a)Piece of bread

b)Polythene bag

1. c) Broken glass
2. d) Blades.

Answer:a) Piece of bread

Question 3.

1. a) Reduce
2. b) Reuse
3. c) Recycle
4. d) Disposal

Answer:d) Disposal

Question 4.

1. a) Milk to curd
2. b) Raw egg to boiled egg
3. c) Ice cube to water
4. d) Grain to flour.

Answer:c) Ice cube to water

 

IV. Match the following:

Answer:

1. b
2. a
3. d
4. c

 

V. Say True or False:

Question 1.

Evaporation of water is a reversible change.

Answer:True

Question 2.

Burning of the paper is an irreversible change.

Answer:True

Question 3.

Rusting of iron is a reversible change.

Answer:False

Question 4.

Sky appears blue at sunrise.

Answer:False

Question 5.

Sunlight is scattered by the gases.

Answer:True

Question 6.

Blue has more scattered capacity.

Answer:True

 

VI. Answer in brief:

1. Why does the sky appear blue?

Answer:

Sunlight is scattered by the gases and particles present in the air. The white light we see is composed of different colours such as violet, indigo, blue, green, yellow, orange and red (VIBGYOR). Among these colours, blue is scattered more. Because of this reason, sky appears blue most of the time.

2. Name the two types of changes.

Answer:

Changes can be classified as

• Reversible
• Irreversible changes.

3. What are reversible changes?

Answer:

Changes which can be reversed are called reversible changes.

4. What are irreversible changes?

Answer:

Irreversible changes are also known as permanent changes. Processes like heating, burning, mixing and powdering cause permanent changes.

5. What is meant by waste?

Answer:

Waste is any substance which is discarded after primary use. It is worthless, defective and of no use. They are unwanted and undesirable materials.

6. What are the 3R’s used to save the environment?

Answer:

The 3R’s are used to save the environment are Reduce, Recycle, and Reuse.

 

VII. Answer in detail:

1. Write the differences between reversible and irreversible changes.

Answer:

Differences between reversible and irreversible changes are:

Reversible Change	Irreversible Change
A substance can turn to its original state.	A substance cannot change to its original state.
The chemical properties of the substance do not change.	The chemical properties of the substance will change.
Most of the physical changes are reversible.	All chemical changes are irreversible.

2. What is household waste and write its classification?

Answer:

Wastes from home are known as household waste. Solid wastes disposed of home and apartments comprise of garbage and rubbish (bottles, cans, clothing, composts, disposable items, food packings, newspapers, 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, &lass, Metals, Plastics.

Solid wastes: Cloths soiled with blood and other body fluids.

e-wastes: Computer parts, Electronic materials, Cell phone parts, CFL bulbs.

3. How can we protect our environment?

Answer:

• Use reusable and recyclable bags and containers.

• Avoid one-time use items and use items which can be used permanently.
• Segregate wastes into bio-degradable and non-biodegradable items and hand over them to the municipal and corporation people who collect them.
• Do not throw away your wastes everywhere. Put them in dustbins and dispose of them properly.
• Don’t waste food. Waste food in schools can be collected and used to feed cattle.
• Organic wastes can be converted into manures.