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 2020-2021

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

Boojho wants to know that which one is irreversible in the following changes:

[A]. Changes of water into water vapour.
[B]. Changes of water vapour into water.
[C]. Changes of ice into water.
[D]. Changes of curd into milk.
Q2

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.




Q3

Boojho is doing some activities with his family and friends. Choose which cannot be reversed?

[A]. Mother heated oil in pan.
[B]. Making some flowers by paper folding.
[C]. Candles are lit and put out.
[D]. Making dough balls by his mother.
Q4

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.




Q5

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.
Q6

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.



Q7

Boojho is writing some sentences as heating create change in different objects. Consider the following sentences which shows reversible changes:

[A]. Expansion of metals on heating is a reversible change.
[B]. Straight wire to coiled wire is a reversible change.
[C]. Melting of coal tar is reversible change.
[D]. All of the above.
Q8

Salt can be separated from its solution (salt dissolved in water) because:

[A]. Mixing of salt in water is a change that can be reversed by heating and melting of salt.
[B]. Mixing of salt in water is a change that cannot be reversed.
[C]. Mixing of salt in water is a permanent change.
[D]. Mixing of salt in water is the change that can be reversed by evaporation.




Q9

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.
Q10

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?

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 do you know about Reversible Changes?

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?

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.

Describe a chemical change?

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.