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

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

In which of the following sentences is or are cannot be reversed?

[A]. Mixing of cement and water
[B]. Mixing of plaster of Paris and water
[C]. Baking of clay brick
[D]. All the above.




Q3

Paheli mixed flour and water. Consider the statements and choose which can be reversed change?

[A]. Made a dough.
[B]. Rolled the dough to make chapati.
[C]. Baked the chapati on a pan.
[D]. Dried the chapati and ground it in a grinder to make powder.
Q4

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
Q5

Conversion of ice cream to molten ice cream and cold milk to hot milk 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]. Folding of paper is an irreversible change.
[B]. The cutting of paper is an irreversible change.
[C]. The rolling of roti out of dough is an irreversible change.
[D]. The baking of clay pot in an oven is reversible change.
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

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
Q10

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.
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.