Posts
Class V Science T1U4 Science in Everyday Life Textbook Solutions
4.SCIENCE IN EVERYDAY LIFE
I. Choose the correct answer.
1. Choose the correct answer.
1. Blue appearance of the sky is due to__________ of light.
a. reflection b. refraction
c. interference d. Scattering
Ans: 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
Ans: 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
Ans: a. melting of ice
4. Chemical reactions are example for
a. reversible change b. irreversible change
c. both of them d. none of them
Ans: b. irreversible change
5. Which of the following is not an organic waste?
a. Flowers b. Vegetables
c. Fruits d. Battery
Ans: d. Battery
II. Fill in the blanks.
1. The book ‘Wings of fire’ was written by ________
Ans: Dr. A.P.J. Abdul Kalam
2. A stretched rubber band comes back to normal shape. It is an example for
___________
Ans: reversible change.
3. Most of the physical changes are ____________ changes.
Ans: reversible
4. News paper is a _____________ waste.
Ans: recyclable
5. Wastes from houses and apartments are called _____________ waste.
Ans: organic
III. Match the following.
IV. Circle the odd one.
1. a) Melting b) Freezing c) Boiling d) Cooking
Ans: Cooking
2. a) Boiling b) Burning c) Cooking d) Rusting of iron
Ans: Boiling
3. a) Vegetables b) Flowers c) Fruits d) Chemicals
Ans: Chemicals
4. a) Paper b ) Glass c) Metals d) Paints
Ans: Paints
V. Answer briefly.
1. Sky appears blue in colour. Why?
Ans:
The white light we see from the sun is composed of different colours like violet, indigo,blue, green, yellow, orange and red (VIBGYOR).
Among these colours, blue is scattered more. Because of this reason, the sky appears blue most of the time.
2. What is reversible change?
Ans:
Changes which can be reversed are called reversible changes.
3. Differentiate reversible and irreversible changes.
Ans:
4. What are the different types of wastes?
Ans:
We can classify the wastes as organic waste, toxic waste, recyclable waste,e-waste, non-recyclable waste etc.
5 Write a note on e-waste.
Ans:
Waste is any substance which is discarded after primary use. It is worthless, defective, unwanted and undesirable materials.Such e-wastes are Computer parts, Electronic materials, Cell phone parts, CFL bulbs.
6 Name the scientists from Tamil Nadu?
Ans:
Sir.C.V. Raman
Dr. A.P.J. Abdul Kalam
VI. Answer in detail.
1. Write about different household wastes.
Ans:
Waste from home is known as household waste.
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. Explain the need for waste disposal.
Ans:
Waste management is needed for the following reasons.
To control pollution
Various pollution 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 waste in your school environment?
Ans:
Separating waste is the first step to manage waste in the school environment.
I’ll provide a waste bin sufficiently to all classes and near wash basins.
I’ll segregate waste into biodegradable and non biodegradable.
I’ll handover the collected waste to proper usage.
Food waste will be given to feed cattle.
Organic waste from the canteen,noon meals kitchen will be given to prepare organic manure.
Paper waste and plastic waste will be segregated properly and given for recycling.
If we segregate the wastes properly, either it can be reused or recycled and no waste will go into land useless.
