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MCQ Questions for Class 6 Science Chapter 6 Changes Around Us with Answers

 

Changes Around Us Class 6 MCQs Questions with Answers

I. 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
(e) 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


II. 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


III. 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


IV. Match the items given in column I suitably with those given in column II.

Column IColumn 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 IColumn 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


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