NCERT Solutions Class 7th Science Chapter – 5 Physical and Chemical Changes
| Textbook | NCERT |
| Class | 7th |
| Subject | Science |
| Chapter | 5th |
| Chapter Name | Physical and Chemical Changes |
| Category | Class 7th Science MCQ |
| Medium | English |
| Source | Last Doubt |
| NCERT Solutions Class 7th Science Chapter – 5 Physical and Chemical Changes MCQ What is physical reaction?, Why is chemical reaction important?, What are the types of reaction?, What are the 7 types of chemistry?, What is oxidation?, What causes a chemical reaction?, What is called chemical reaction?, What is a chemical reaction answer?, How are chemicals made?, Why is water a chemical?, What is not a chemical?, Are chemicals good or bad?, Why are chemicals used?, Do chemicals cause pollution?, Is chemical bad for skin?, Is Aqua good for skin?, Is Citric Acid good for the skin?, Is synthetic wax safe for skin?, Is coconut wax skin safe?, Is all soy wax skin safe?, Is a full face wax safe?, Is facial wax powder safe?, Are wax strips safe?, Is soft wax safe for face?, How do you apply hard wax?, Is cream wax good for face?, Is face wax good for dry skin Will read about etc. |
NCERT Solutions Class 7th Science Chapter – 5 Physical and Chemical Changes
Chapter – 5
Physical and Chemical Changes
MCQ
| (1) 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 Answer – (B) Cooking of vegetables |
| (2) 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. Answer – (C) Its state is changed from liquid to semi-solid and it changes taste and the change cannot be reversed. |
| (3) 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. Answer – (C) Hydrogen gas are produced when acetic acid is added to a solution of a sodium hydrogen carbonate. |
| (4) Galvanization Is A Process Used To Prevent Rusting Of Which Of The Following? A. Iron B. Zinc C. Aluminium D. Copper Answer – (A) Iron |
| (5) 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. Answer – (D) Iron and rust are the same substances. |
| (6) 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. Answer – (B) The chemical name of baking soda is calcium carbonate. |
| (7) 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 Answer – (D) All the above |
| (8) 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. Answer – (D) None of the above. |
| (9) 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 Answer – (D) All the above |
| (10) 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. Answer – (D) Reaction between baking soda and vinegar oxygen is evolved. |
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