\n| 1. A change which can be undone or reversed.<\/p>\n 2. It is a temporary change.<\/p>\n 3. Melting and folding are examples of it.<\/td>\n | 1. A change which cannot be undone or reversed.<\/p>\n 2. It is a permanent change.<\/p>\n 3. Burning and cooking of food are examples of it.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n Question 3.
\nCan you obtain wood from sawdust?
\nAnswer:
\nNo, because it is an irreversible change.<\/p>\n Question 4.
\nCan we say that ironing of a cloth is a reversible change? Give reasons.
\nAnswer:
\nIroning removes the wrinkles of the clothes, which can come back in the same condition. Hence, ironing of a cloth is a reversible change.<\/p>\n Question 5.
\nCan deforestation be considered as a reversible change?
\nAnswer:
\nNo, deforestation can\u2019t be considered as a reversible change because no same tree can be planted after felling down or cutting.<\/p>\n Question 6.
\nIs printing a reversible or an irreversible change?
\nAnswer:
\nPrinting is an irreversible change because we cannot separate and collect the printing ink after printing.<\/p>\n Question 7.
\nGive two examples each of reversible and irreversible changes.
\nAnswer:
\nReversible changes: Melting of wax and stretching of a rubber band.
\nIrreversible changes: Burning of a paper and growth of plants.<\/p>\n Question 8.
\nState whether burning of a piece of paper is a reversible or an irreversible change.
\nAnswer:
\nWhen we bum a piece of paper, it changes into ash and smoke. We cannot combine the ash and smoke to form the original piece of paper. So the burning of a piece of paper is an irreversible change.<\/p>\n Question 9.
\nClassify the following as reversible or irreversible changes:
\n(i) Growth of a plant
\n(ii) Ploughing a field,
\n(ii) Melting of wax
\n(iv) Falling of rain
\n(v) Pulling of rubber string
\n(vi) Breaking of a glass rod
\n(mi) Cooking of food.
\nAnswer:
\nReversible changes: (ii), (iii), (v)
\nIrreversible changes: (i), (iv), (vi), (vii).<\/p>\n Question 10.
\nHow does curd set? Is this change reversible?
\nAnswer:
\nA small quantity of curd is added to warm milk. The milk is stirred and is set aside undisturbed for a few hours at a warm place. In a few hours, the milk changes into curd.
\nCurd formed from milk cannot be changed into milk again. So, this is an irreversible change.<\/p>\n Question 11.
\nWhat are fast and slow changes?
\nAnswer:
\nFast changes take place over a short duration of time.
\nSlow changes take a longer duration of time to complete.<\/p>\n Question 12.
\nDefine physical and chemical changes. Give examples.
\nAnswer:
\n1. Physical change: Physical change is a temporary change in which chemical composition of the substance does not change and no new substance is formed.<\/p>\n During a physical change, only the physical properties of a substance change.
\nIt is a reversible change. For example, melting of ice, during this change, the water changes from its solid form to liquid form. It can be solidified again.The water remains water in both the cases.<\/p>\n 2. Chemical change: A chemical change is a permanent change in which not .
\nonly the physical properties but chemical properties also change. It is an irreversible change. For example, formation of curd from milk, rusting of iron, etc.<\/p>\n Question 13.
\nFormation of clouds is a physical change. Explain.
\nAnswer:
\nFormation of clouds is a physical change as it is phase transformation cycle of natural water from liquid to gas and then, gas to liquid. Hence, the property of water never changes in clouds form.<\/p>\n Question 14.
\nExplosion of a cracker is a chemical change. Explain.
\nAnswer:
\nExplosion of crackers is a chemical change because the explosive reactants are transformed into gaseous products along with heat and light and thus cannot be reversed.
\nHence, it is a chemical change.<\/p>\n Question 15.
\nGive some examples of physical and chemical changes.
\nAnswer:
\nExamples of physical changes:
\nTearing of sheet of paper into pieces, melting of ice, change of water into steam, breaking of glass tumbler, glowing of electric bulb, dissolution of sugar or salt in water.<\/p>\n Examples of chemical changes:
\nBurning of paper, wood, candle, etc., formation of curd from milk, cooking of food, rusting of iron and mixing of vinegar with baking soda, electrolysis of water.<\/p>\n Question 16.
\nClassify the following changes in as many ways as you can:<\/p>\n \n- Breaking of a brick with a hammer.<\/li>\n
- Beating of heart.<\/li>\n
- Germination of a seed.<\/li>\n
- Burning of an incense-stick (agarbatti).<\/li>\n
- Occurrence of solar eclipse.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Physical change, irreversible change.<\/li>\n
- Periodic change, irreversible change.<\/li>\n
- Irreversible change,<\/li>\n
- Irreversible change, chemical change.<\/li>\n
- Irreversible change.<\/li>\n<\/ol>\n
Question 17.
\nMost physical changes are reversible. Give reasons with two examples.
\nAnswer:<\/p>\n \n- Melting of ice: During this change, the water changes from its solid form to liquid form. It can be solidified again. The water remains water in both cases, hence reversible.<\/li>\n
- Glowing of an electric bulb: During this change, electricity is passed through the tungston filament which becomes white hot and glows, but when the switch is off, the filament returns to its original shape and condition, hence totally reversible.<\/li>\n<\/ol>\n
Question 18.
\nGive one example .each for physical and chemical changes
\nAnswer:
\nPhysical change (Melting of ice)
\n![\"Changes](\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48715199513_97aac20439_o.png\")
\nQuestion 19.
\nWhat is charring of sugar? Is it a chemical change?
\nAnswer:
\nWhen sugar is continuously heated in the porcelain dish, it becomes foggy due to water vapour. A black powdery substance is left behind, which is charcoal. This process is also called charring of sugar and this is a chemical change.
\n![\"Changes](\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48715199543_97ffc4347b_o.png\")
\nQuestion 20.
\nGive some examples of changes which take place on their own.
\nAnswer:
\n![\"Changes](\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48715699692_2143c21793_o.png\") <\/p>\n Question 21.
\nGive some examples of changes which take place on their own.
\nAnswer:
\nMany changes are taking place around us on their own. For example:<\/p>\n \n- Ripening of crops in the fields.<\/li>\n
- Leaves fall from trees.<\/li>\n
- Flowers bloom and then wither away.<\/li>\n
- Growing of hair and nail.<\/li>\n<\/ul>\n
Could there be other ways to bring a change?<\/strong><\/p>\nQuestion 1.
\nDoes, like all other liquids, water expand on heating and contract on cooling?
\nAnswer:
\nNo, water is an exception. Water contracts on cooling till 4\u00b0C but expands when cooled further down from 4\u00b0C to 0\u00b0C.<\/p>\n Question 2.
\nList few ways to bring a change.
\nAnswer:<\/p>\n \n- Heating or cooling<\/li>\n
- Mixing two or more substances<\/li>\n
- By applying force etc.<\/li>\n<\/ul>\n
Question 3.
\nGive some examples from daily life where expansion of metal by heating is used. Explain.
\nAnswer:
\nFixing of a metal rim on an wooden wheel and fixing of wooden handles in iron blade in agricultural tools are such examples.
\nThe iron blade of these tools has a ring in which the wooden handle is fixed. Normally, the ring is slightly smaller in size than the wooden handle. To fix the handle, the ring is heated and it becomes slightly larger in size (expands). Now, the handle easily fits into the ring. When the ring cools down, it contracts and fits tightly onto the handle.
\n![\"Changes](\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48715481713_3c24b9ef31_o.png\")
\nSuch a change is also used for fixing the metal rim on a wooden wheel of a\u00abcart as shown in Fig. 6.4. Again the metal rim is made slightly smaller than the wooden wheel. On heating, the rim expands and fits onto the wheel. Cold water is then poured over the rim, which contracts and fits tightly onto the wheel.<\/p>\n Question 4.
\nExplain how a metal rim slightly smaller than a wooden wheel can be fixed on it.
\nAnswer:
\nThe metal rim is always made slightly smaller than the wooden wheel. The metal rim is heated; on heating, the rim expands and fits onto the wheel. Cold water is then poured over the rim. Due to cooling, rim contracts and fits tightly over the wheel.<\/p>\n Activity 7.
\nTake a small candle and measure its length with a scale. Now, fix it at a suitable place and light it. Let it burn for some time. Now blow out the candle and measure its length again (Fig.).
\nIts length will be reduced.<\/p>\n Can the change in the length of the candle be reversed? If we were to take some wax in a pan and heat it, can this change be reversed (Fig.)?
\n![\"Changes](\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48715199578_967e71b608_o.png\")
\n![\"Changes](\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2021\/12\/48715528981_671e295249_o.png\")
\nNo, the change in the length of the candle cannot be reversed. Yes, on heating the wax in a pan, its change into liquid form can be reversed.<\/p>\n Objective Type Questions<\/strong><\/p>\nQuestion 1.
\nMatch the following items given in Column A with that in Column B:<\/p>\n \n\n\nColumn A<\/strong><\/td>\nColumn B<\/strong><\/td>\n<\/tr>\n\n(a) Irreversible change
\n(b) Reversible change
\n(c) Sawing of a piece of wood
\n(d) Ripening of mango
\n(e) Melting of wax
\n(f) Formation of a sugar solution<\/td>\n | (i) Needs mixing of two substances
\n(ii) Needs heating
\n(iii) Chemical change
\n(iv) A new substance is formed
\n(v) Physical change
\n(vi) No new substance is formed<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nAnswer:<\/p>\n \n\n\nColumn A<\/strong><\/td>\nColumn B<\/strong><\/td>\n<\/tr>\n\n(a) Irreversible change
\n(b) Reversible change
\n(c) Sawing of a piece of wood
\n(d) Ripening of mango
\n(e) Melting of wax
\n(f) Formation of a sugar solution<\/td>\n | (vi) No new substance is formed
\n(iv) A new substance is formed
\n(v) Physical change
\n(i) Needs mixing of two substances
\n(ii) Needs heating
\n(iii) Chemical change<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nQuestion 2.
\nFill in the blanks with appropriate words:<\/p>\n \n- Changes that lead to the formation of new substances are called \u2026\u2026\u2026\u2026\u2026\u2026 .<\/li>\n
- If the removal of the cause of change leads to regain the original situation, then the change is known as \u2026\u2026\u2026\u2026.. .<\/li>\n
- Burning of wood in a chulha is a tan change.<\/li>\n
- Melting of candle wax is a\/an \u2026\u2026\u2026\u2026\u2026\u2026\u2026\u2026. change.<\/li>\n
- Heat is a form of \u2026\u2026\u2026\u2026. .<\/li>\n
- On cooling, liquid \u2026\u2026\u2026\u2026\u2026 into solid.<\/li>\n
- Conversion of a liquid to vapour by heating is called \u2026\u2026\u2026\u2026.. .<\/li>\n
- The changes which are controlled by man are called \u2026\u2026\u2026\u2026.. .<\/li>\n
- \u2026\u2026\u2026\u2026 is a reversible change.<\/li>\n
- NO new substance is formed in \u2026\u2026\u2026. .<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- Alchemical<\/li>\n
- reversible change<\/li>\n
- irreversible<\/li>\n
- reversible<\/li>\n
- energy<\/li>\n
- freezes<\/li>\n
- evaporation<\/li>\n
- man-made changes<\/li>\n
- Glowing of an electric bulb<\/li>\n
- physical changes<\/li>\n<\/ol>\n
Question 3.
\nState whether the statements given below are True or False:<\/p>\n \n- Cooking of rice is a physical change.<\/li>\n
- Breaking of a China (porcelain) dish is a chemical change.<\/li>\n
- Rusting of iron is an irreversible change.<\/li>\n
- Eruption of a volcano is a reversible change.<\/li>\n
- Formation of clouds is an irreversible change.<\/li>\n
- Conversion of a solid to liquid by heating is called fusion.<\/li>\n
- Change of seasons is a natural change.<\/li>\n
- Pressure is equal to the force per unit second.<\/li>\n<\/ol>\n
Answer:<\/p>\n \n- False<\/li>\n
- False<\/li>\n
- True<\/li>\n
- False<\/li>\n
- False<\/li>\n
- True<\/li>\n
- True<\/li>\n
- False<\/li>\n<\/ol>\n
Question 4.
\nChoose the correct option in the following questions:<\/p>\n (i) Which of the following changes can be reversed?
\n(a) Raw egg to boiled egg
\n(b) Wet clothes to dry clothes
\n(c) Bud to flower
\n(d) Cow dung to biogas
\nAnswer:
\n(b) All other changes are irreversible.<\/p>\n (ii) Which of the following changes cannot be reversed?
\n(a) Milk to paneer
\n(b) Cold milk to hot milk
\n(c) Yam to knitted sweater
\n(d) Wet clothes to dry clothes
\nAnswer:
\n(a) Paneer is a new substance and cannot be converted into milk.<\/p>\n (iii) Metal rim is fixed to the wooden cart wheel by
\n(a) heating metal rim
\n(b) heating wooden wheel
\n(c) cooling metal rim
\n(d) cooling wooden wheel
\nAnswer:
\n(a) On heating metal ring expands and fits around the wheel.<\/p>\n (iv) On heating metal rim
\n(a) expands
\n(b) contracts
\n(c) depends how much it is heated
\n(d) depends as the type of meted
\nAnswer:
\n(a) All the metals expand on heating.<\/p>\n (v) Which one of the steps while burning a candle is not reversible?
\n(a) Melting of solid wax
\n(b) liquid wax changes into vapours
\n(c) Wax vapour bums into flame
\n(d) All of these
\nAnswer:
\n(c) Burning of vapours is an irreversible process in which combustion of vapours occurs.<\/p>\n (vi) Which is a way to make a change happen?
\n(a) Heating a substance
\n(b) Cooling a substance
\n(c) Mixing a substance with another substance
\n(d) All of these
\nAnswer:
\n(d) A change can be made to happen by any of these means.<\/p>\n (vii) Rusting of iron is an example of
\n(a) slow change
\n(b) fast change
\n(c) reversible change
\n(d) physical change
\nAnswer:
\n(a) Rusting of iron is a slow change.<\/p>\n (viii) Conversion of a solid to liquid by heating is called
\n(a) evaporation
\n(b) melting
\n(c) condensation
\n(d) freezing
\nAnswer:
\n(b) Solid changes into liquid by heating. This is called melting.<\/p>\n (ix) Which of the following is not a man-made change?
\n(a) Change of day and night
\n(b) Burning of fuels
\n(c) Drying of clothes
\n(d) Tearing of paper
\nAnswer:
\n(a) Change of day and night is a natural change.<\/p>\n (x) Which of the following is a chemical change?
\n(a) Evaporation of water
\n(b) Burning of fuels
\n(c) Moving of a wheel
\n(d) Breaking of a brick
\nAnswer:
\n(b) Burning of fuels is an example of chemical change.<\/p>\n <\/h4>\n","protected":false},"excerpt":{"rendered":"Changes Around Us Class 6 Extra Questions Science Chapter 6 NCERT Extra Questions for Class 6 Science Chapter 6 Changes […]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"Get Changes Around Us Class 6 Extra Questions Science Chapter 6 at Infinity Learn","custom_permalink":"cbse\/study-materials\/science\/changes-around-us-class-6-extra-questions-science-chapter-6\/"},"categories":[116,21],"tags":[],"table_tags":[],"acf":[],"yoast_head":"\n Changes Around Us Class 6 Extra Questions Science Chapter 6 - Infinity Learn by Sri Chaitanya<\/title>\n<meta name=\"description\" content=\"Get Changes Around Us Class 6 Extra Questions Science Chapter 6 at Infinity Learn\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/infinitylearn.com\/surge\/cbse\/study-materials\/science\/changes-around-us-class-6-extra-questions-science-chapter-6\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Changes Around Us Class 6 Extra Questions Science Chapter 6 - 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