Updated on June 13, 2023
by Tiwari Academy
by Tiwari Academy
Class 7 Science Chapter 5 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 2024-25
| Class: 7 | Science |
| Chapter: 6 | Physical and Chemical Changes |
| Contents: | Multiple Choice Questions MCQ Tests |
Class 7 Science Chapter 6 MCQ Tests for 2024-25
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
Paheli is writing some sentences, choose the correct sentence and help her:
[A]. Galvanization refers depositing a layer of zinc on iron
[B]. Souring of milk is a chemical change
[C]. Carbon dioxide turns lime water as milky
[D]. All the above
Q4
A man painted his main gate made up of iron, to
[A]. Prevent it from rusting
[B]. Protect it from the Sun
[C]. Make it look beautiful
[D]. Make it dust free
Q5
In which of the following sentences is or are correct?
[A]. Rusting is a chemical change because a new substance is formed
[B]. Beating of Aluminium metal to make Aluminium foil, is a physical change
[C]. Digestion of food is a chemical change
[D]. All the above
Q6
Galvanization is a process used to prevent rusting of which of the following?
[A]. Iron
[B]. Zinc
[C]. Aluminium
[D]. Copper
Q7
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
Q8
Consider the following sentences and choose the incorrect one:
[A]. Cooking causes breakdown of complex molecules of carbohydrates, fats and proteins into smaller molecules.
[B]. Rusting is a reddish-brown flaky substance that forms on the surface of any substances.
[C]. Chemical change is permanent and irreversible change.
[D]. Cooking is regarded as a decomposition reaction.
Q9
Which of the following statements is incorrect for a chemical reaction?
[A]. Heat may be given out by never absorbed
[B]. Sound may be produced
[C]. A colour change may take place
[D]. A gas may be evolved
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
Which method is used to prevent rusting?
[A]. Galvanization
[B]. Crystallization
[C]. Sedimentation
[D]. None of these
Q12
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.
Q13
Which one is a physical change?
[A]. Melting of ice
[B]. Melting of wax
[C]. Formation of steam from water
[D]. All the above
Q14
In which of the following sentences is incorrect?
[A]. Cutting of log of wood into pieces is a chemical change.
[B]. Iron pipes coated with zinc do not get rusted easily.
[C]. Condensation of steam is not a chemical change
[D]. The chemical name of baking soda is sodium hydrogen carbonate.
Q15
Crystallization is a process to obtain:
[A]. Pure solids only
[B]. Pure liquid only
[C]. Pure solids and liquids
[D]. Solids or powder
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
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
Q19
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.
Q20
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.
Q21
Consider the following sentences and choose the correct one:
[A]. Making sugar solution is a physical change
[B]. A physical change is generally reversible
[C]. Grinding of wheat grain changes its size, although it is a physical change
[D]. All the above
Q22
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
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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Last Edited: June 13, 2023
