Class 6 Science Chapter 6 MCQ

Class 6 Science Chapter 6 MCQ (Multiple Choice Questions) of Changes Around Us. These MCQs are helpful in the preparation of school tests or online test also. All the questions related to intext as well as exercises are included with answers and explanation here.

Practice here with more than 100 questions related to standard 6 sciences chapter 6. Practicing these questions ensure to get good marks in school assessments.

Class 6 Science Chapter 6 MCQ Online Tests

Class: 6Science
Chapter: 6Changes Around Us
Contents: MCQ Online Tests with answers

Class 6 Science Chapter 6 MCQ Test for 2021-2022

Class 6 Science chapter 6 MCQ Online test is helpful for all the students to clear their doubts and to be confident in NCERT Book for exams. All the questions are taken from NCERT Books for class 6 Science and answers also completely confined to CBSE NCERT Books only.




Q1

Paheli had bought a new bottle of pickle from the market. She tried to open the metal cap to taste it but could not do so. She then took a bowl of hot water and immersed the upper end of the bottle in it for 5 minutes. She could easily open the bottle, as:

[A]. Expands and open easily.
[B]. Contracts and open easily.
[C]. No changes in sizes.
[D]. First contracts then expand easily.
Q2

Which of the following changes can be reversed?

[A]. Burning of a candle.
[B]. Making biogas from cow dung.
[C]. Drying of wet cloth.
[D]. Baking cake in an oven.
Q3

Conversion of ice into water and water into ice is an example of change which can be reversed. Choose the statement where you can say that the changes can be reversed:

[A]. Melting of wax
[B]. Heating of an iron rod
[C]. Knitting of a sweater
[D]. All the above
Q4

Conversion of clay into baked is an example of change which cannot be reversed. Choose the statement where you can say that changes cannot be reversed.

[A]. Milk into curd
[B]. Making biogas from cow dung
[C]. Burning of a candle
[D]. All the above
Q5

Rolling of chapatti and baking of chapatti are the changes that:

[A]. Can be reversed
[B]. Cannot be reversed
[C]. Can be reversed and cannot be reversed, respectively
[D]. Cannot be reversed and can be reversed, respectively




Q6

Change of a bud into a flower is a change which cannot be reversed. Consider some statements which are same:

[A]. Digestion of cud (ruminants)
[B]. Burning of black coal
[C]. Seeds to sprouted seeds
[D]. All the above
Q7

Consider the following sentences and choose the reversible changes:

[A]. Changing of bread into toast.
[B]. Chemical change.
[C]. Melting of wax.
[D]. None of the above.
Q8

Boojho wants to know that reversible changes happened around him. Would you help him?

[A]. Growth of plant
[B]. Falling of rain
[C]. Glowing of electric bulb
[D]. Raw egg to boiled egg
Q9

Paheli is writing some sentences about changes. As “some changes are beneficial to us whereas some are harmful to us”. Consider the sentences and choose the incorrect statement:

[A]. The ripening of fruits is a beneficial change.
[B]. The spoiling of cooked food is a harmful change.
[C]. Heat is the cause of the change of state of ice from solid to liquid.
[D]. Melting of wax is an irreversible change.
Q10

Mohan is writing some sentences about changes. As “changes are very necessary to us”. Consider the sentences and choose the “reversible changes”:

[A]. Rolling of chapati (roti) from dough
[B]. Dissolving salt in water
[C]. Dissolving sugar in water
[D]. All of the above



Q11

Paheli observed the following changes, while lighting a candle. The changes can that can be reversed are:

[A]. Wax was melting, candle was burning.
[B]. Candle was burning, size of the candle was reducing.
[C]. Size of the candle was reducing, melted wax was getting solidified.
[D]. Wax was melting, melted wax was getting solidified.
Q12

Conversion of ice into water and water into ice is an example of change which can be reversed. Choose the statement where you can say that the statements is or are correct about changes:

[A]. The burning of wax is a reversible change.
[B]. Melting of wax is an irreversible change.
[C]. The bursting of balloon is a reversible change.
[D]. The shaping of a lump of wet clay into a pot by a potter on his wheel is a reversible change.
Q13

Shyamal is writing some sentences about changes. Choose the statement where you can say that the statements is or are correct about changes:

[A]. The burning of an incense stick is reversible change.
[B]. The setting of cement on mixing with water is a reversible change.
[C]. The setting of plaster of Paris on mixture is a reversible change.
[D]. The decrease in size of an iron object on cooling is reversible change.
Q14

An iron ring is heated. Which of the following statement 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 reversed.
[D]. The ring changes its shape and the change cannot be reversed.
Q15

Which of the following will lead to changes which cannot be reversed?

[A]. Addition of water to salt, addition of water to cement.
[B]. Addition of water to cement, addition of water to plaster of Paris.
[C]. Addition of water to plaster of Paris, pouring of water on hot iron rim of a cartwheel.
[D]. Addition of water to salt, pouring of water on hot iron rim of a cartwheel.



Q16

Payel is writing some sentences about changes. Choose the statement where you can say that the statements is or are incorrect about changes:

[A]. The increase in size on heating is called expansion.
[B]. The decrease in size of an object on cooling is called contraction.
[C]. The iron rims are fitted around wooden wheel by the process of expansion.
[D]. On cooling the hot ring of spade (blade) expands and becomes little smaller in size.
Q17

Which of the following changes cannot be reversed?

[A]. Hardening of cement.
[B]. Freezing of ice cream.
[C]. Opening a door.
[D]. Melting of chocolate.
Q18

Manish is writing some sentences about changes. Choose the statement where you can say that the statements is or are correct about changes:

[A]. The making of painting on a drawing sheet is an irreversible change.
[B]. The breaking of a toy is a reversible change.
[C]. The age of man is a reversible change.
[D]. The cooking of food is a reversible change.
Q19

Which of the following changes cannot be reversed?

[A]. Blowing of a balloon.
[B]. Folding a paper to make a toy Aeroplane.
[C]. Rolling a ball of dough to make roti.
[D]. Baking cake in an oven.
Q20

Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel because on heating the iron:

[A]. Expands and fits onto the wooden wheel
[B]. Contracts and fits onto the wooden wheel
[C]. No change in the size takes place
[D]. Expands first, then on cooling contracts and fits onto the wooden wheel



Q21

Payel is writing some sentences about changes. Choose the statement where you can say that the statements is or are correct about changes:

[A]. The grinding of wheat to form flour is an irreversible change.
[B]. Formation of curd from milk is an irreversible change.
[C]. The burning of paper is an irreversible change.
[D]. All the above.
Q22

There are given some statement about different changes. Choose the statements which are associated with “Irreversible changes”.

[A]. Making painting on a drawing sheet.
[B]. Growth of nails on fingers.
[C]. Burning of wax in the form of candle.
[D]. All the above
Q23

Boojho appeared in class test where he wrote some statements but he confused to know the statements which are related to “reversible changes”. Would you help him to know that?

[A]. Cow dung to biogas.
[B]. Making cheese paneer from milk.
[C]. Weathering of rocks.
[D]. Folding of dress to pass through a waterlogged area.
Q24

Consider the following sentences which is related to “changes around us” and choose the correct one(s):

[A]. Bursting of balloons is irreversible change.
[B]. Cutting of paper is an irreversible change.
[C]. Sawing (cutting) of a log of wood is an irreversible change.
[D]. All the above.
Q25

Paheli is writing some sentences. She wants to choose correct sentences from the given statement. Would you help her?

[A]. Physical changes cannot be reversed while chemical changes can be reversed.
[B]. Drying of clothes is a physical change and an Irreversible change.
[C]. Salt can be obtained from seawater by the process of evaporation.
[D]. A potato remains a poem even after it is cooked. Hence, cooking is a physical change.
What are Irreversible changes in 6th Science Chapter 6?

Changes in which the altered forms of substances cannot regain their original forms are called Irreversible changes. These are permanent changes which cannot be reversed even if the cause of the change is removed. In this type of change a new substance is formed because of changes in the molecular arrangements that make up the substance. The internal structure is changed at the molecular level.

What is Reversible Changes in class 5 Science Chapter 6?

Changes in which the new object can get back to its original form are called Reversible Changes. These are temporary changes which can be reversed when the cause of the change is removed. In a reversible change, the internal structure of the substance does not usually changes.

What do you understand by Physical change as per 6th Chapter of Class 6 Science?

Physical change is a temporary change in which no new substance is formed. The change occurs in the
physical form of the substance but not in the chemical form. This is a reversible change.

What is a chemical change in 6th Science Chapter 6?

Changes in which new substances are formed are know as chemical changes. This is a permanent change in which entirely a new substance is formed with different properties. In most of the cases, it is irreversible.

Difference between Physical

Physical change

1. It is a temporary change. 2. No new substance is formed. 3. It can be reversed. 4. Examples: freezing of water, tearing of paper.

Chemical change

1. It is a permanent change. 2. New substance is formed. 3. It cannot be reversed. 4. Examples:- rusting of iron, cooking of food.