Lakhmir Singh Manjit Kaur Class 6 Science 6th Chapter Changes Around Us Solution

Changes Around Us

Very Short Type Questions

(1) Ans: Heating or cooling.

(2) Ans: Cooling

(3) Ans: Reversible changes.

(4) Ans: Irreversible change.

(5) Ans: Irreversible.

(6) Ans: No.

(7) Ans: No.

(8) Ans: Yes.

(9) Ans: No.

(10) Ans: No.

(11) Ans: Melting max.

(12) Fill in the following blank with a suitable word:

When one or more properties of material become different, we say that a change has taken place in it.

Short Answer Type Questions

(13) Ans: (i) Formation of curd from milk,

(ii) Cooking of food,

(iii) Burning of fuels,

(iv) Drying of clothes, and

(v) Rusting of iron.

(14) Ans: Beneficial changes: The ripening of fruits.

Harmful changes: The spoiling of cooked food is harmful change.

(15) Ans: Melting of ice and Boiling of water.

(16) Ans: Burning of paper and burning of fuels.

(17) Ans: The iron blade of a soil digging tool is fixed to a wooden handle by the process of expansion on heating.

(18) 

Reversible Changes Irreversible Changes
Melting of wax Growth of a plant
Pulling of rubber  string Cooking food
Formation of curd from milk

(19) Ans: 

Reversed Can’t be reversed
Ironing of a cloth Rusting of iron
Boiling of water to from steam Ripening of fruits
Inflating a balloon

(20) Ans: (a) Melting of wax: melting of wax is a reversible change.

(b) Burning of wax: the burning of wax is an irreversible change.

(21) Ans: The rolling of roti out of dough is a reversible change. And baking of roti is an irreversible change.

(22) Ans: (a) Inflating a balloon: inflating a balloon is a reversible change.

(b) Bursting an inflated balloon: the bursting of balloon is an irreversible change.

(23) 

Reversible Irreversible
Knitting of sweater Boiling of an egg
Growth of nails Making biogas from cow dung
Folding of paper

(24) Ans:

Reversed Cannot be reversed
Drying of wet clothes Grinding of grain to flour
Stretching a spring Burning of incense stick
Melting of ice

Long Answer Type Questions

(25) Ans: When one or more properties of a thing become different, we say that it has changed or a change has taken place in it.

  • The melting of ice involves a change in state.

(26) Ans: Reversible changes: A change which can be reversed to form the original substance is called a reversible changes.

  • Some of the examples are: Melting of ice, Boiling of water, Melting of wax etc.

Irreversible changes: A change which cannot be reversed to from the original substance is called an irreversible change.

  • Some of examples are: Burning of paper, Burning of fuels, Growth of plant etc.

(27) Ans: The iron rim is made slightly smaller than the wooden wheel. The iron rim is heated uniformly by making a fire due to which it expands and becomes somewhat bigger in size. Being bigger in size, the hot iron rim is easily put around the wooden wheel. Cold water is then poured over the hot rim to cool it. On cooling the hot iron contracts and fits tightly on to the wooden wheel.

  • The iron rims are fitted around wooden wheels by the process of expansion on heating.

(28) Ans: If we burn a piece of paper, it changes into ash and smoke. Now, we cannot combine the ash smoke to form the original piece of paper. So, the burning of paper is an irreversible change. But when we boil water by heating then it changes into steam. Now if we cool the steam then water is formed again. So, the boiling of water is a reversible change.

(29) Ans: Even the same material can undergo reversible change or irreversible change under different set of conditions.

  • Examples: The folding of paper is reversible change. But the cutting of paper is an irreversible change.
  • The rolling of roti out of dough is a reversible change. But baking of the roti is an irreversible change.

(30) Ans: That depends on the type of the material. if u have a volatile substance (like naphthalene balls), it can change its shape if it is in contact with air.

Multiple Choice Questions (MCQs)

(31) Ans: (a) water changing into ice

(32) Ans: (b) charcoal burns

(33) Ans: (c) state

(34) Ans: (c) ripening of fruit

(35) Ans: (c) B and C

(36) Ans: (b) boiling of an egg

(37) Ans: (d) C and D

(38) (a) Ironing of clothes

(39) Ans: (b) B and C

(40) Ans: (d) B and D

Next Chapters Solution Link:

Getting to Know Plants Chapter 7 Solution

Body Movements Chapter 8 Solution

The Living Organisms And Their Surroundings Chapter 9 Solution

Motion and Measurement of Distances Chapter 10 Solution

Light Shadows and Reflection Chapter 11 Solution

Electricity and Circuits Chapter 12 Solution

Fun with Magnets Chapter 13 Solution

Water Chapter 14 Solution

Air Around Us Chapter Chapter 15 Solution

Garbage In Garbage Out Chapter 16 Solution

25 Comments

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  1. I want to read this book because In my school this book is taught

  2. lots of mistakes are there kindly resolve them

    1. Sure tell me the question number

  3. This is very much good webite

  4. Very nice answer

  5. It is very good website

    1. Thanks bro

  6. Yes there are some mistakes in the answer I find only one mistake that is no 2 the answer will be (heat) please accept it and also see the book

    1. No.2 and no. 11 is wrong.

  7. Yes there are some mistakes in the answer but I find only one mistake that is no 2 the answer will be (heat) please accept it and also see the book

  8. I like so much this website

  9. MISTAKE IN VERY SHORT QUESTION ANSWER QUESTION NUMBER =2 PLEASE RECTIFY

  10. There are lots of mistakes in the answers. Please check.

  11. Hello I’m study in rns dps Ara

  12. very short answer type 2nd question’s answer

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