Text Book Back Questions and Answers - Chapter 4 Science In Everyday Life Term 1 5th Science Guide Samacheer Kalvi Solutions - SaraNextGen [2024-2025]

Updated On May 15, 2024

By SaraNextGen

Chapter 4 - Science in Eveyday Life - Term 1 - 5th Science Guide Samacheer Kalvi Solutions

Text Book Back Questions and Answers
Evaluation
I. Choose the correct Answer:
Question $1 .$
Blue appearance of the sky is due to ________ of light.
a) reflection
b) refraction
c) interference
d)scattering
Answer:
d) scattering

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

Question $3 .$
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

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

Question $5 .$
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:
Question $1 .$
The book Wings of fire was written by
Answer:
Dr. A.P.J. Abdul Kalam

Question $2 .$
A stretched rubber band comes back to normal shape. It is an example for_______

Answer:
Reversible changes

Question $3 .$
Most of the physical changes are ________ changes.
Answer:
Reversible changes

Question $4 .$
Newspaper is a ________waste.
Answer:
Recyclable waste

Question $5 .$
Wastes from house and apartments are called _______ waste.
Answer:
Household

III. Match the following:

Answer:
1. $\mathrm{e}$
2. d
3. a
4. $b$
5. c

IV.Circle the odd one
Question $1 .$
a) Melting
b) Freezing
c) Boiling
d) Cooking
Answer:
d) Cooking

Question $2 .$
a) Boiling
b) Burning
c) Cooking
d) Rusting of Iron
Answer:
a) Boiling

Question $3 .$
a) Vegetables
b) Flowers
c) Fruits
d) Chemicals
Answer:
d) Chemicals

Question $4 .$
a) Paper
b) Glass
c) Metals
d) Paints
Answer:
a) Paper

V. Answer in brief:
Question $1 .$
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.

Question $2 .$
What is reversible change?
Answer:
Changes which can be reversed are called reversible change. Eg: melting of ice.

Question $3 .$
Differentiate reversible and irreversible changes.
Answer:

Question $4 .$
What are the different types of waste?
Answer:
Wastes are of two types, they are;
- Household wastes.
- Wastes from school.

Question $5 .$
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. ewaste contains hundreds of substances, of which many are toxic.

Question $6 .$
Name the scientists from Tamil Nadu.

Answer:
- Dr M.S. Swaminathan.
- Venkataraman Radhakrishnan.
- Sir. C.V. Raman.
- Srinivasa Ramanujan.
- Dr. A.P.J. Adbul Kalam.

VI. Answer in detail:
Question $1 .$
Write about different household wastes.
Answer:
Different types of household wastes are :
a) Organic waste: Kitchen wastes, vegetables, flowers, leaves, fruits.
b) Toxic wastes: Old medicines, paints, chemicals, bulbs, spray cans, fertilizers, pesticides, containers, batteries, shoe polish.
c) Recyclable wastes: Paper, glass, metals, plastics.
d) Solid wastes: Cloths soiled with blood and other body fluids.
e) e-wastes: Computer parts, electronic materials, cell phone parts, CFL bulbs.

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

Question $3 .$
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.

I. Choose the Correct Answer:
Question $1 .$
Which among the following is the toxic waste?
a) Vegetable waste
b) Old medicines
c) Kitchen waste
d) Leaves waste
Answer:
b) Old medicines

Question $2 .$
Which is reversible change?
a) Raw egg to boiled egg
b) Ice cube to water
c) Burning paper
d) All the above
Answer:
b) Ice cube to water

Question $3 .$
Who is referred as the people's president?
a) Sir C.V.Raman
b) Ram Nath Kovoind
c) A.P.J.Abdul Kalam
d) None of the above
Answer:
c) A.P.J.Abdul Kalam

Question $4 .$
Sir C.V.Raman won the Nobel prize for his work in
a) Green revolution
b) Composite numbers
c) Structure of ribosome
d) Scattering of light
Answer:
d) Scattering of light

Question $5 .$
National Science Day is celebrated on
a) 27 th February
b) 28 th February
c) 28 th March
d) 27th March
Answer:
b) 28 th February

II. Fill in the blanks:
Question $1 .$
Water changes into ice on cooling is an example of
Answer:
Reversible change

Question $2 .$
change is the _______of a substance from one form to another.
Answer:
Transition

Question $3 .$
A.P.J Abdul Kalam was an
Answer:
Aeronautical Scientist.

Question $4 .$
Changes which cannot be reversed are called
Answer:
Irreversible changes

Question $5 .$
Most of the physical changes are _______change.
Answer:
Reversible

Question $6 .$
Dissolving sugar in water is a _____change.
Answer:
Reversible

Question $7 .$
Paper, LPG, CNG petrol etc, are ________substances.
Answer:
Inflammable

Question 8.
Water on _________changes to ice and on _________comes back to water.
Answer:
cooling, heating

III. Pick out the odd one out:

Question $1 .$
a) Kitchen waste
b) Vegetables
c) Flowers
d)Fertilizers
Answer:
d) Fertilizers

Question $2 .$
a)Piece of bread
b)Polythene bag
c) Broken glass
d) Blades.
Answer:
a) Piece of bread

Question $3 .$
a) Reduce
b) Reuse
c) Recycle
d) Disposal
Answer:
d) Disposal

Question $4 .$
a) Milk to curd
b) Raw egg to boiled egg
c) Ice cube to water
d) Grain to flour.
Answer:
c) Ice cube to water

IV. Match the following:

Answer:
1. $b$
2. a
3. $\mathrm{d}$
4. $\mathrm{c}$

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:
Question $1 .$
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.

Question $2 .$
Name the two types of changes.
Answer:
Changes can be classified as
1. Reversible
2. Irreversible changes.

Question $3 .$
What are reversible changes?
Answer:
Changes which can be reversed are called reversible changes.

Question $4 .$
What are irreversible changes?
Answer:
Irreversible changes are also known as permanent changes. Processes like heating, burning, mixing and powdering cause permanent changes.

Question $5 .$
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.

Question $6 .$
What are the $3 R$ 's used to save the environment?
Answer:
The $3 R$ 's are used to save the environment are Reduce, Recycle, and Reuse.

VII. Answer in detail:
Question $1 .$
Write the differences between reversible and irreversible changes.
Answer:
Differences between reversible and irreversible changes are:

Question $2 .$
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.

Question $3 .$
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.