Class 7 Science Chapter 6 MCQs Questions With Answers NCERT
We have compiled the NCERT MCQ Questions for Class 7 Science Chapter 6 Physical and Chemical Changes with Answers Pdf free download covering the entire syllabus. Practice MCQ Questions for Class 7 Science with Answers on a daily basis and score well in exams. Refer to the Physical and Chemical Changes Class 7 MCQs Questions with Answers here along with a detailed explanation.
Physical and Chemical Changes Class 7 MCQ
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Question 1.
Which of the following statement is incorrect for a chemical reaction?
(a) Heat may be given out but never absorbed
(b) Sound may be produced
(c) A colour change may take place
(d) A gas may be evolved
Answer
Answer: (a) Heat may be given out but never absorbed
Question 2.
Properties like size, shape, colour, state of a substance are
(a) chemical properties
(b) mental properties
(c) physical properties
(d) physico-chemical properties
Answer
Answer: (c) physical properties
Question 3.
A physical change is generally
(a) reversible
(b) irreversible
(c) considerable
(d) all of these
Answer
Answer: (a) reversible
Question 4.
During a physical change, a substance undergoes a change in its
(a) physical properties
(b) chemical properties
(c) both (a) and (b)
(d) none of these
Answer
Answer: (a) physical properties
Question 5.
Rusting of iron is a
(a) physical change
(b) chemical change
(c) both (a) and (b)
(d) all of these
Answer
Answer: (b) chemical change
Question 6.
Rusting occurs when iron is exposed to
(a) oxygen and water
(b) soil and rain
(c) breeze and sunlight
(d) salt water and clouds
Answer
Answer: (a) oxygen and water
Question 7.
When carbon dioxide is passed through lime water, the substance formed is
(a) calcium oxide
(b) calcium carbonate
(c) both (a) and (b)
(d) none of these
Answer
Answer: (b) calcium carbonate
Question 8.
A chemical change is also called a
(a) chemical reaction
(b) rusting
(c) both (a) and (b)
(d) all of these
Answer
Answer: (a) chemical reaction
Question 9.
Burning of any substance is a/an
(a) physical change
(b) chemical change
(c) irreversible change
(d) both (b) and (c)
Answer
Answer: (d) both (b) and (c)
Question 10.
The process of depositing a layer of zinc over iron is known as
(a) aluminisation
(b) galvanisation
(c) fertilisation
(d) ironing
Answer
Answer: (b) galvanisation
Question 11.
Two drops of dilute sulphuric acid were added to 1 g of copper sulphate powder and then small amount of hot water was added to dissolve it (step I). On cooling, beautiful blue-coloured crystals 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
Answer
Answer: (c) both physical change
Question 12.
Which among the following is a physical change?
(a) Burning of wood
(b) Ripening of fruit
(c) Cutting a log of wood in small pieces
(d) Cooking of food
Answer
Answer: (c) Cutting a log of wood in small pieces
Question 13.
Which of the following is a chemical change?
(a) Germination of seeds
(b) Cutting a piece of paper
(c) Bursting of fire crackers
(d) Both (a) and (c)
Answer
Answer: (d) Both (a) and (c)
Question 14.
A chemical change may bring
(a) evolution of gas
(b) change in colour
(c) change in taste
(d) all of these
Answer
Answer: (d) all of these
Question 15.
Which is the formula of ozone?
(a) Fe2O3
(b) Fe3O2
(c) O2
(d) O3
Answer
Answer: (d) O3
Question 16.
Physical changes are
(a) reversible
(b) irreversible
(c) permanent
(d) temporary.
Answer
Answer: (a) reversible
Question 17.
A change of state from one form to another is a
(a) physical change
(b) chemical change
(c) biological change
(d) state variation
Answer
Answer: (a) physical change
Question 18.
Which of the following is an example of a physical change?
(a) Mixing of baking soda and vinegar together to cause bubbles and foam.
(b) Falling of a glass cup from the counter and its shattering on the ground.
(c) Lighting a piece of paper on fire causing it to bum up and leave ashes.
(d) Baking a birthday cake for your mother.
Answer
Answer: (b) Falling of a glass cup from the counter and its shattering on the ground.
Question 19.
Which of the following is an example of a chemical change?
(a) Filling up a balloon with hot air.
(b) Taking a glass of water and freezing it by placing it in the freezer.
(c) A plant collecting sunlight and turning it into food.
(d) Your dog ripping up your homework.
Answer
Answer: (c) A plant collecting sunlight and turning it into food.
Question 20.
Which of the following changes can easily be reversed?
(a) Chemical Change
(b) Physical Change
(c) Both physical and chemical changes
(d) Neither physical nor chemical change
Answer
Answer: (b) Physical Change
Question 21.
When a new substance is formed with different properties than those of the original substance, it is called a
(a) chemical change
(b) physical change
(c) freezing
(d) boiling
Answer
Answer: (a) chemical change
Question 22.
If the chemical properties of a substance remain unchanged and its appearance or shape changes, it is called a
(a) chemical change
(b) physical change
(c) both physical and chemical changes
(d) neither physical nor chemical change
Answer
Answer: (b) physical change
Question 23.
Which of the following is an example of a physical change?
(a) Metal rusting
(b) Silver tarnishing
(c) Water boiling
(d) Paper burning
Answer
Answer: (c) Water boiling
Question 24.
Which characteristic best describes a physical change?
(a) Composition changes
(b) Composition stays the same
(c) Form stays the same
(d) Mass is lost
Answer
Answer: (b) Composition stays the same
Question 25.
Which of the following is a chemical change?
(a) Freezing of water
(b) Cutting of wood
(c) Baking of bread
(d) Bending of wire
Answer
Answer: (c) Baking of bread
Question 26.
Which of the following is not a clue that could indicate the occurrence of a chemical change?
(a) Change in colour
(b) Change in shape
(c) Change in energy
(d) Change in odour
Answer
Answer: (b) Change in shape
Question 27.
Which property stays the same during physical and chemical changes?
(a) Density
(b) Shape
(c) Mass
(d) Arrangement of particles
Answer
Answer: (c) Mass
Fill in the Blanks
Question 1.
Setting curd from milk is a _________ change.
Answer
Answer: chemical
Question 2.
Broadly, changes are of two types, _________ and _________.
Answer
Answer: physical, chemical
Question 3.
Physical properties of a substance consists of_________ , _________ , _______ and state.
Answer
Answer: shape, size, colour
Question 4.
No new substance is formed in a _________ change.
Answer
Answer: physical
Question 5.
Calcium carbonate is decomposed to form _________ and _________ .
Answer
Answer: calcium oxide, carbon dioxide
Question 6.
Magnesium on burning produces _________ .
Answer
Answer: magnesium oxide
Question 7.
Magnesium hydroxide is produced by mixing _________ with _________ .
Answer
Answer: magnesium oxide, water
Question 8.
_________ is a chemical change.
Answer
Answer: Burning
Question 9.
For rusting, the presence of both _________ and _________ is important.
Answer
Answer: oxygen, water (or moisture)
Question 10.
Rusting can be prevented by _________ , _________ and _________ the iron articles.
Answer
Answer: polishing, painting, oiling
Question 11.
A physical change is generally _________ .
Answer
Answer: reversible
Question 12.
Making sugar solution is a _________ change.
Answer
Answer: physical
Question 13.
The formula of sodium hydrogen carbonate is _________ .
Answer
Answer: NaHCO3
Question 14.
Burning of candle shows both ________ and ________ changes.
Answer
Answer: physical, chemical
Question 15.
Large crystals of pure substances are obtained by _________ .
Answer
Answer: crystallisation
Question 16.
Cutting a log of wood into pieces is a ………………….
Answer
Answer: Physical Change
Question 17.
Condensation is a ………………….
Answer
Answer: Physical Change
Question 18.
Carbon dioxide turns lime water, milky due to the formation of ………………….
Answer
Answer: Calcium carbonate
Question 19.
Two methods by which rusting of iron can be prevented are …………………. and ………………….
Answer
Answer: Greasing and galvanisation
Question 20.
Changes in which only …………………. properties of a substance change are called physical changes.
Answer
Answer: Physical
Question 21.
A gas may evolve during a …………………. change.
Answer
Answer: Chemical
Question 22.
Magnesium hydroxide is …………………. in Nature.
Answer
Answer: Basic
True or False
Question 1.
Stainless steel is made by mixing aluminium with carbon.
Answer
Answer: False
Question 2.
Burning of any substance is a chemical change.
Answer
Answer: True
Question 3.
Stretching of rubber band is a physical change.
Answer
Answer: True
Question 4.
We must use concentrated sulphuric acid for crystallisation of copper sulphate.
Answer
Answer: False
Question 5.
Changes are broadly classified as physical and chemical changes.
Answer
Answer: True
Question 6.
Galvanizing is a physical change.
Answer
Answer: True
Question 7.
Rusting is a chemical change.
Answer
Answer: True
Question 8.
The symbol of rust is Fe2O3.
Answer
Answer: True
Question 9.
A chemical change is also called a chemical reaction.
Answer
Answer: True
Question 10.
In chemical changes, new substances are produced.
Answer
Answer: True
Question 11.
The process of photosynthesis is a chemical change.
Answer
Answer: True
Question 12.
Cooking of rice is a physical change.
Answer
Answer: False
Question 13.
Burning of cracker is a physical change.
Answer
Answer: False
Question 14.
The mass of a substance changes during a chemical change.
Answer
Answer: True
Question 15.
Chemical change is permanent.
Answer
Answer: True
Question 16.
The chemical name of baking soda is sodium hydrogen carbonate.
Answer
Answer: True
Question 17.
Changes in which new substances are formed are called chemical changes.
Answer
Answer: True
Question 18.
Evolution of a gas may occur in a chemical change.
Answer
Answer: True
Question 19.
Burning of paper is chemical change.
Answer
Answer: True
Question 20.
Shape and size are the physical properties of a substance.
Answer
Answer: True
Question 21.
Magnesium bums in air without flame.
Answer
Answer: False
Question 22.
Oxygen layer protects us from harmful radiations of the sun.
Answer
Answer: False
Match the Following
| Column I | Column II |
| 1. Physical change | (a) Irreversible |
| 2. Chemical change | (b) CaO + CO2 |
| 3. Burning | (c) Chemical change |
| 4. MgO + H2O | (d) Ferric oxide |
| 5. CaCO3 | (e) Mg(OH)2 |
| 6. Chemical formula of rust | (f) Do not corrode |
| 7. Galvanisation | (g) Reversible |
| 8. Baking soda | (h) Sodium hydrogen carbonate |
| 9. Stainless steel | (i) Process of formation of crystals |
| 10. Crystallisation | (j) Zinc coating on iron |
Answer
Answer:
| Column I | Column II |
| 1. Physical change | (g) Reversible |
| 2. Chemical change | (a) Irreversible |
| 3. Burning | (c) Chemical change |
| 4. MgO + H2O | (e) Mg(OH)2 |
| 5. CaCO3 | (b) CaO + CO2 |
| 6. Chemical formula of rust | (d) Ferric oxide |
| 7. Galvanisation | (j) Zinc coating on iron |
| 8. Baking soda | (f) Do not corrode |
| 9. Stainless steel | (h) Sodium hydrogen carbonate |
| 10. Crystallisation | (i) Process of formation of crystals |
| Column A | Column B |
| 1. Rust | a. Physical change |
| 2. Condensation | b. Hydrated oxide |
| 3. Burning of paper | c. Crystallisation |
| 4. Process of formation of crystals | d. Galvanisation |
| 5. Coating of an iron object with zinc | e. Chemical change |
Answer
Answer:
| Column A | Column B |
| 1. Rust | b. Hydrated oxide |
| 2. Condensation | a. Physical change |
| 3. Burning of paper | e. Chemical change |
| 4. Process of formation of crystals | c. Crystallisation |
| 5. Coating of an iron object with zinc | d. Galvanisation |
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