Class 7 Science Chapter 6 MCQ (Multiple Choice Questions) of Physical and Chemical Changes. It consists of important questions from the entire NCERT Textbook, intext question answers and exercises questions. All the MCQs are given with complete explanation of answer. Attempt the questions first and then view answers for justification. Practicing with these MCQ online tests ensure you to get good marks in school exams.

Class 7 Science Chapter 6 MCQ for 2022-2023

Class: 7Science
Chapter: 6Physical and Chemical Changes
Contents:Multiple Choice Questions MCQ Tests

Class 7 Science Chapter 6 MCQ Tests for 2022-23

Class 7 Science Chapter 6 MCQ with answers and explanations are given below. All the questions are taken from NCERT Books for Class 7 Science only. There are more than 80 questions in the format of sets of 10 questions at a time. After doing one test, click on Start a New Test for more practice.

Q1

In which of the following statement are incorrect?

[A]. When a candle burns both physical and chemical change take place
[B]. Anaerobic bacteria digest animal waste and produce biogas
[C]. Ships suffer a lot of damage though they are not painted
[D]. Stretching of rubber band is not a physical change
Q2

Which one of the following is a chemical change?

[A]. Twinkling of stars
[B]. Cooking of vegetables
[C]. Cutting of roots
[D]. Boiling of water
Q3

A chemical change may involve:

[A]. Change in colour only
[B]. Change in temperature only
[C]. Evolution of gas only
[D]. All of these
Q4

In which of the following statements is or are correct?

[A]. Dissolving common salt in water is a physical change
[B]. During rusting iron reacts with moist oxygen to form iron oxide
[C]. Tearing of paper is a physical change it cannot be reversed
[D]. All the above
Q5

Which of the following are true when milk changes into curd?

[A]. Its state is changed from liquid to semi-solid.
[B]. It changes colour and it changes taste.
[C]. Its state is changed from liquid to semi-solid and it changes taste and the change cannot be reversed.
[D]. Its state is changed from liquid to semi-solid and it changes colour and it changes taste and the change cannot be reversed.
Q6

Do you know in which of the following sentences is or are incorrect?

[A]. Cutting of a log of wood into pieces is a physical change.
[B]. Limewater turns milky on passing CO2 through it.
[C]. Hydrogen gas are produced when acetic acid is added to a solution of a sodium hydrogen carbonate.
[D]. Explosion of a firework is a chemical change.
Q7

In which of the following sentences is or are incorrect?

[A]. A change in which only the physical properties of any substances get changed and no new substances is formed.
[B]. A change in which the composition and chemical properties of the substances get changes.
[C]. Microbes produces enzymes which break down complex organic compounds into simpler substance.
[D]. None of the above.
Q8

Paheli’s mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystal of sugar got separated. This indicates a:

[A]. Physical change that can be reversed
[B]. Chemical change that can be reversed
[C]. Physical change that cannot be reversed
[D]. Chemical change that cannot be reversed
Q9

In which of the following sentences are incorrect?

[A]. Chemical change is also called a chemical reaction.
[B]. In a chemical change it is either evolved or absorbed.
[C]. In a physical change no new substance is formed at all.
[D]. None of the above.
Q10

Two drops of dilute sulphuric acid were added to 1 gram of copper sulphate powder and then small amount of hot water was added to dissolve it (Step-I). On cooling, beautiful blue coloured crystal got separated (Step-II). Step I and Step II are:

[A]. Physical and chemical changes respectively
[B]. Chemical and physical changes respectively
[C]. Both physical change
[D]. Both chemical change
Q11

Boojho is writing some sentences. Choose the incorrect one and help him:

[A]. Rusting of iron, photosynthesis and digestion of food are examples of chemical change.
[B]. In order to protect iron from rusting a coating of zinc is deposited on its surface.
[C]. Some substance cannot be obtained in pure state from their solution by crystallization.
[D]. None of the above.
Q12

Which method is used to prevent rusting?

[A]. Galvanization
[B]. Crystallization
[C]. Sedimentation
[D]. None of these
Q13

In which of the following sentences are incorrect?

[A]. Photosynthesis is a chemical change.
[B]. Digestion of food is a chemical change.
[C]. Formation of manure from leaves is a chemical change.
[D]. Iron and rust are the same substances.
Q14

Which one is a physical change?

[A]. Melting of ice
[B]. Melting of wax
[C]. Formation of steam from water
[D]. All the above
Q15

Mohan is writing some sentences, choose the sentences which is or are incorrect one:

[A]. When carbon dioxide is passed through lime water, it turns milky due to the formation of calcium carbonate.
[B]. The chemical name of baking soda is calcium carbonate.
[C]. Two methods by which rusting of iron can be prevented are painting and galvanization.
[D]. When a candle burns both physical and chemical change take place.
Q16

There are given some statement. In which of the following pair is a chemical change?

[A]. Ice melts on heating, iron rust in moist air.
[B]. Common salt dissolve in water, pulses change on cooking.
[C]. Milk into curd, germination of seeds.
[D]. Ripening of fruits, melting of wax.
Q17

Consider the following sentences which is not associated with physical change?

[A]. Melting of wax or butter or ghee
[B]. Glowing of an electric bulb or tube
[C]. Dissolved common salt or sugar in water
[D]. Growing of a seed into a plant
Q18

Consider the following sentences which is not associated with Chemical change?

[A]. Formation of a solution of soluble salt in water
[B]. Changing water into steam by heating
[C]. Ringing of an electric bell
[D]. All the above
Q19

Paheli is writing some sentences about chemical change. Choose the incorrect statement and help her?

[A]. Rusting and formation fermentation are the example of chemical change.
[B]. In this change in which the composition and chemical properties of the substance get changes.
[C]. This change is permanent and irreversible
[D]. None of the above
Q20

Boojho is writing some sentences about corrosion. Choose the incorrect statements and help him?

[A]. Rusting is a slow oxidation process
[B]. Copper wires lose their shine and acquire green coating.
[C]. Metal surface interacts with oxygen moisture and other gases present in air and slowly get coated with oxide.
[D]. None of the above.
Q21

Consider the following statements and choose the correct ones:

[A]. Corrosion of metals causes great economic loss.
[B]. Corrosion of metals can be prevented if the contact between metal and air is cutoff.
[C]. A process of giving a thin coating of zinc on Iron sheets to preventing rusting called galvanization.
[D]. All the above
Q22

In which of the following statement is or are correct?

[A]. Anodizing is the process in which metals like Aluminium, copper etc. are coated electrically to protect them from corrosion.
[B]. Electroplating is the process where metal surface is covered with another metal by using electric current.
[C]. Tinning is a process of giving a coating of molten tin to avoid corrosion.
[D]. All the above
Q23

Paheli is writing some statement which is given by her teacher. Would you help him to choose the correct statements?

[A]. Stainless steel is an alloy of iron which does not rust easily.
[B]. Cooking vessels made of copper and brass are given a coating of tin to avoid corrosion.
[C]. Galvanization process where thin coating of zinc on iron sheets to prevent rusting.
[D]. All the above.
Q24

Boojho appeared in class test where he wrote some statements but he confused to know the incorrect statement. Would you help him to know that?

[A]. In a chemical change heat, light or both are generally given out or absorbed.
[B]. Iron utensils when exposed to moist air get gradually coated with reddish brown coating called rust.
[C]. A process of separating a pure substance in the form of crystals from the hot saturated solution by cooling is called crystallization.
[D]. None of the above
Q25

In which of the following statements is or are incorrect?

[A]. Mixing of metals with other metal or nonmetals in molten from is called alloying.
[B]. In an endothermic change heat is absorbed.
[C]. Dissolution of sugar in water is a physical change we get back sugar and water by evaporation.
[D]. Reaction between baking soda and vinegar oxygen is evolved.

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