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Changes Around Us Class 6 MCQs Questions with Answers
Choose the correct option.
Question 1.
What are the changes that can be reversed called?
(a) Reversible changes
(b) Irreversible changes
(c) Contraction
(d) Evaporation
Answer
Answer: (a) Reversible changes
Question 2.
A process in which an object becomes smaller or shrinks is called
(a) chemical change
(b) irreversible change
(c) contraction
(d) expansion
Answer
Answer: (c) contraction
Question 3.
Temperature at which a solid starts melting is called its
(a) melting point
(b) boiling point
(c) freezing point
(d) slow change
Answer
Answer: (a) melting point
Question 4.
The change in which chemical properties of a substance change is called
(a) chemical change
(b) physical change
(c) heating
(d) pressure
Answer
Answer: (a) chemical change
Question 5.
Which is a way to make change happen?
(a) Heating a substance
(b) Cooling a substance
(c) Mixing a substance
(d) All of these
Answer
Answer: (d) All of these
Question 6.
The melting of gold is an example of:
(a) chemical change
(b) physical change
(c) chemical electrical
(d) physical magnetical
Answer
Answer: (b) physical change
Question 7.
Which is not a sign of reversible change?
(a) Change in state
(b) Change in property
(c) Change in size
(d) Change in appearance
Answer
Answer: (b) Change in property
Question 8.
Which of the following changes can be reversed?
(a) Cow dung to biogas
(b) Bud to flower
(c) Wet clothes to dry clothes
(d) Raw egg to boiled egg
Answer
Answer: (c) Wet clothes to dry clothes
Question 9.
A process in which liquid changes into vapour is called
(a) contraction
(b) evaporation
(c) melting
(d) freezing
Answer
Answer: (b) evaporation
Question 10.
Rusting of iron is an example of
(a) slow change
(b) fast change
(c) reversible change
(d) physical change
Answer
Answer: (a) slow change
Question 11.
Which of the following changes cannot be reversed?
(a) Milk to paneer
(b) Cold milk to hot milk
(c) Yarn to knitted sweater
(d) Wet clothes to dry clothes
Answer
Answer: (a) Milk to paneer
Question 12.
Melting of wax is
(a) chemical change
(b) physical change
(c) both of these
(d) none of these
Answer
Answer: (b) physical change
Question 13.
Burning of paper is
(a) chemical change
(b) physical change
(c) reversible
(d) all of these
Answer
Answer: (a) chemical change
Question 14.
Force can cause change in the
(a) size
(b) shape
(c) direction
(d) all of these
Answer
Answer: (d) all of these
Question 15.
Which one of the following factors is involved in a change?
(a) Force
(b) Heat
(c) Chemical reaction
(d) All of these
Answer
Answer: (d) All of these
Question 16.
Which of the following material do not expands on heating?
(a) Iron
(b) Wood
(c) Glass
(d) Oil
Answer
Answer: (b) Wood
Question 17.
The effects of the changes are
(a) change in size
(b) change in shape
(c) change in colour or taste
(d) all of these
Answer
Answer: (d) all of these
Question 18.
The meaning of reverse is called
(a) getting back to starting point
(b) increase in size or volume
(c) decrease in size or volume
(d) a push or pull applied on an object
Answer
Answer: (a) getting back to starting point
Question 19.
The change of day and night is caused by
(a) stars
(b) sun
(c) moon
(d) rotation of the earth
Answer
Answer: (d) rotation of the earth
Question 20.
When a heated metal is cooled it
(a) expands
(b) contracts
(c) doesn’t change
(d) both (a) and (b)
Answer
Answer: (b) contracts
Question 21.
Which of these changes can be reversed?
(a) Cutting of trees
(b) Melting of ghee
(c) Burning of candle
(d) Blooming of flower
Answer
Answer: (b) Melting of ghee
Question 22.
Which of these changes cannot be reversed?
(a) Hardening of cement
(b) Freezing of ice cream
(c) Opening a door
(d) Melting a chocolate
Answer
Answer: (a) Hardening of cement
Question 23.
An iron ring is heated. Which of the following statements about it is incorrect?
(a) The ring expands.
(b) The ring almost comes to the same size on cooling.
(c) The change in this case is reversible.
(d) The ring changes its shape and the change cannot be reversed.
Answer
Answer: (d) The ring changes its shape and the change cannot be reversed.
Question 24.
Which type of change is beating of heart?
(a) Slow change
(b) Fast change
(c) Chemical change
(d) None of these
Answer
Answer: (b) Fast change
Question 25.
Which of these is a physical change?
(a) Burning of paper
(b) Melting of ice
(c) Formation of rust on iron nail
(d) Formation of curd from milk
Answer
Answer: (b) Melting of ice
Question 26.
Which type of change is melting of wax?
(a) Chemical change
(b) Physical change
(c) Both of these
(d) None of these
Answer
Answer: (b) Physical change
Question 27.
Which of these is not an irreversible change?
(a) Ironing of clothes
(b) Baking the cake
(c) Burning of incense stick
(d) Rusting of steel gates
Answer
Answer: (a) Ironing of clothes
Question 28.
What are the substances formed in a reaction called?
(a) Reactants
(b) Products
(c) Sometimes products and sometimes reactants
(d) None of these
Answer
Answer: (b) Products
Question 29.
What is formation of steam from boiling water called?
(a) Reversible change
(b) Irreversible change
(c) Chemical change
(d) None of these
Answer
Answer: (a) Reversible change
Question 30.
What are the changes in which a new substance is formed called?
(a) Physical changes
(b) Chemical changes
(c) Fast changes
(d) Slow changes
Answer
Answer: (b) Chemical changes
Fill in the Blanks
Question 1.
The changes that can be ……………… are known as reversible changes.
Answer
Answer: reversed is a chancre.
Question 2.
The changes that cannot be reversed are known as ……………… changes.
Answer
Answer: irreversible
Question 3.
A process in which liquid changes into vapour is called ………………
Answer
Answer: evaporation
Question 4.
A process in which an object becomes ……………… is called contraction.
Answer
Answer: smaller
Question 5.
A push or pull acting on a body which tends to change its state of rest or motion is ………………
Answer
Answer: force
Question 6.
Melting of ice is a ……………… change.
Answer
Answer: physical
Question 7.
Formation of curd from milk is a ……………… change.
Answer
Answer: chemical
Question 8.
A ball will change its ……………… on being hit by a bat.
Answer
Answer: direction
Question 9.
The iron rim of a wooden wheel is kept a little ……………… than the wheel.
Answer
Answer: smaller
Question 10.
Burning of coal is an ……………… change.
Answer
Answer: irreversible
Question 11.
The effect of heating can be ……………… by cooling.
Answer
Answer: reversed
Question 12.
Things expand on ………………
Answer
Answer: heating
Question 13.
Cutting the vegetables is an ……………… change.
Answer
Answer: irreversible
Question 14.
Some metals ……………… on heating.
Answer
Answer: Expand
Question 15.
Burning of forest is a ……………… change
Answer
Answer: fast
Question 16.
Stretching of rubber band is a ………………… change.
Answer
Answer: reversible
Question 17.
Ageing of living beings is an ………………… change.
Answer
Answer: irreversible
Question 18.
………………… is a component that actually dissolves in a solvent.
Answer
Answer: Solute
Question 19.
Metals contract on …………………
Answer
Answer: cooling
Question 20.
………………… change takes place when charcoal bums.
Answer
Answer: irreversible
Question 21.
Heating and cooling of an object is a ………………… change.
Answer
Answer: reversible
Question 22.
Formation of rust on iron nail is a ………………… change.
Answer
Answer: Chemical
Question 23.
Melting of ice is a ………………… change.
Answer
Answer: physical
Question 24.
The iron blade of a spade is fixed to a wooden handle by the process of …………………
Answer
Answer: Expansion
Question 25.
When an inflated balloon is pressed between two hands, its ………………… and ………………… change.
Answer
Answer: shape, size
State whether the given statements are true or false.
Question 1.
A change which can be undone is called irreversible change.
Answer
Answer: False
Question 2.
Burning and cooking of food are the examples of irreversible change.
Answer
Answer: True
Question 3.
Cooking of rice is a physical change.
Answer
Answer: False
Question 4.
Change of seasons is a natural change.
Answer
Answer: True
Question 5.
Rusting of iron is an irreversible change.
Answer
Answer: True
Question 6.
Burning of fuels is a chemical change.
Answer
Answer: True
Question 7.
Dissolving salt in water is a chemical change.
Answer
Answer: False
Question 8.
Burning of paper is a reversible change.
Answer
Answer: False
Question 9.
The evaporation of liquids is an irreversible change.
Answer
Answer: False
Question 10.
Ironing of clothes is a reversible change.
Answer
Answer: True
Question 11.
Rolling out of roti from dough is an irreversible change.
Answer
Answer: False
Question 12.
Metals contract on heating.
Answer
Answer: False
Question 13.
Melting of wax and burning of wax are chemical changes.
Answer
Answer: False
Question 14.
Making an aeroplane by cutting out of a paper is an irreversible change.
Answer
Answer: True
Question 15.
Chemical changes are usually reversible.
Answer
Answer: False
Question 16.
Burning of fuel is a chemical change.
Answer
Answer: True
Question 17.
Curd formed from milk cannot be changed into milk again.
Answer
Answer: True
Question 18.
All the things around us are in solid state only.
Answer
Answer: False
Question 19.
On continuously heating the sugar, a black powdery substance is formed.
Answer
Answer: True
Question 20.
The metal rim is always made slightly bigger than the wooden wheel.
Answer
Answer: False
Question 21.
Conversion of raw egg to boiled egg is a reversible change.
Answer
Answer: False
Question 22.
The ripening of fruit is a harmful change.
Answer
Answer: False
Question 23.
Metals expands on heating.
Answer
Answer: True
Question 24.
The setting of Plaster of Paris on mixing water is an irreversible change.
Answer
Answer: True
Question 25.
Changes do not involve interactions.
Answer
Answer: False
Match the following
| Column I | Column II |
| 1. Cold coffee to hot | (a) Contracts |
| 2. On heating metals | (b) Changing |
| 3. On cooling metals | (c) Expand |
| 4. Everything in universe keeps | (d) Reversible change |
| 5. Bursting of balloon is | (e) Physical change |
| 6. When properties change | (f) Formation of curd |
| 7. When properties doesn’t change | (g) Irreversible change |
| 8. An undesirable change | (h) Chemical change |
| 9. A desirable change | (i) Rusting of iron |
Answer
Answer:
| Column I | Column II |
| 1. Cold coffee to hot | (d) Reversible change |
| 2. On heating metals | (c) Expand |
| 3. On cooling metals | (a) Contracts |
| 4. Everything in universe keeps | (b) Changing |
| 5. Bursting of balloon is | (g) Irreversible change |
| 6. When properties change | (h) Chemical change |
| 7. When properties doesn’t change | (e) Physical change |
| 8. An undesirable change | (i) Rusting of iron |
| 9. A desirable change | (f) Formation of curd |
| Column A | Column B |
| 1. Substance shrinks or changes its shape | (a) Slow change |
| 2. Solid substances melt and turn into liquid | (b) Physical change |
| 3. No new substances are formed | (c) Chemical change |
| 4. Properties of products are different from the reactants | (d) Melting |
| 5. Change that takes long time to complete | (e) Contraction |
Answer
Answer:
| Column A | Column B |
| 1. Substance shrinks or changes its shape | (e) Contraction |
| 2. Solid substances melt and turn into liquid | (d) Melting |
| 3. No new substances are formed | (b) Physical change |
| 4. Properties of products are different from the reactants | (c) Chemical change |
| 5. Change that takes long time to complete | (a) Slow change |
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