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Physical and Chemical Changes Science - Physical and Chemical Changes

Gujarat Board (GSEB) - STD 7 - Science (GSEB - English Medium). 117 questions in this chapter.

Question types

Physical and Chemical Changes question types

117 questions across 9 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

117
Questions
9
Question groups
5
Question types
Sample Questions

Physical and Chemical Changes questions

One sample from each question group in this chapter. Select any group above to see the full set with answer keys.

Q 1MCQ (1 Marks)1 Mark
Iron pillar near the Qutab Minar in Delhi is famous for the following facts. Which of these facts is responsible for its long stability?
  • A
    It is more than 7 m high
  • B
    It weighs about 6000 kg
  • C
    It was built more than 1600 years ago
  • ✓
    It has not rusted after such a long period

Answer: D.

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Q 2MCQ (1 Marks)1 Mark
Paheli's mother made a concentrated sugar syrup by dissolving sugar in hot water. On cooling, crystals of sugar got separated.
This indicates 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

Answer: A.

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Q 3MCQ (1 Marks)1 Mark
A man painted his main gate made up of iron, to
(i) prevent it from rusting.
(ii) protect it from the Sun.
(iii) make it look beautiful.
(iv) make it dust free.
Which of the above statements is/are correct?
  • A
    (i) and (ii)
  • B
    (ii) and (iii)
  • C
    Only (ii)
  • ✓
    (i) and (iii)

Answer: D.

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Q 4MCQ (1 Marks)1 Mark
Which of the following statements is incorrect for a chemical reaction?
  • ✓
    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: A.

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Q 5MCQ (1 Marks)1 Mark
Which of the following are true when milk changes into curd?
(i) Its state is changed from liquid to semi-solid.
(ii) It changes colour.
(iii) It changes taste.
(iv) The change cannot be reversed.
Choose the correct option.
  • A
    (i) and (ii)
  • B
    (ii) and (iii)
  • ✓
    (i), (iii) and (iv)
  • D
    (i) and (iv)

Answer: C.

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Q 6Assertion (A) & Reason (B) MCQ1 Mark
The following questions consist of two statements Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Sugar can be obtained from its solution by crystallisation.
Reason (R) It is a chemical change.
  • A
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true, but R is not the correct explanation of A
  • ✓
    A is true, but R is false
  • D
    A is false, but R is true

Answer: C.

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Q 7Assertion (A) & Reason (B) MCQ1 Mark
The following questions consist of two statements Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Rusting is the formation of rust.
Reason (R) Heating speeds up rusting.
  • A
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true, but R is not the correct explanation of A
  • ✓
    A is true, but R is false
  • D
    A is false, but R is true

Answer: C.

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Q 8Assertion (A) & Reason (B) MCQ1 Mark
The following questions consist of two statements Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Rotting of fruit is a chemical change.
Reason (R) In rotting of fruit, a new substance is formed.
  • ✓
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true, but R is not the correct explanation of A
  • C
    A is true, but R is false
  • D
    A is false, but R is true

Answer: A.

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Q 9Assertion (A) & Reason (B) MCQ1 Mark
The following questions consist of two statements Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Rusting is prevented by galvanisation.
Reason (R) Galvanisation is depositing a layer of zinc on iron.
  • ✓
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true, but R is not the correct explanation of A
  • C
    A is true, but R is false
  • D
    A is false, but R is true

Answer: A.

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Q 10Assertion (A) & Reason (B) MCQ1 Mark
The following questions consist of two statements
Assertion (A) and Reason (R). Answer these questions by selecting the appropriate option given below.
Assertion (A) Iron can be prevented from rusting.
Reason (R) Objects made up of iron are painted to break its direct contact with air and moisture.
  • ✓
    Both A and R are true and R is the correct explanation of A.
  • B
    Both A and R are true, but R is not the correct explanation of A.
  • C
    A is true, but R is false.
  • D
    A is false, but R is true.

Answer: A.

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Q 262 Marks Questions2 Marks
A student took a solution of copper sulphate in a beaker and put a clean iron nail into it and left it for about an hour.
(i) What changes do you expect?
(ii) Are these changes chemical in nature?
(iii) Write a word equation for the chemical change, if any.
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Q 272 Marks Questions2 Marks
Classify the following processes into physical or chemical changes.
(a) Beating of aluminium metal to make aluminium foil
(b) Digestion of food
(c) Cutting of a log of wood into pieces
(d) Burning of crackers
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Q 292 Marks Questions2 Marks
Magnesium ribbon burns in air and changes to white substance, i.e. magnesium oxide. When magnesium oxide dissolves in water, what type of change take place? Give reason in support of your answer. Express the change in the form of equation.
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Q 313 Marks Question3 Marks
In the summer holidays, Karan went to Rann of Kutch In Gujarat with his parents. Karan was aware that in the coastal regions of India especially in the Rann of Kutch common salt is obtained from sea water. Karan was very excited to see that place. He requested his father that he want to see the process of obtaining salt from sea. His father helped him and they went to see the place where common salt was collecting. And he also explained the whole process. Karan was very happy to see the process.
Now, answer the following questions.
(i) How the crystals of common salt obtained from sea water?
(ii) Name the process by which salt is collected from sea water?
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Q 323 Marks Question3 Marks
Rahul was a student of class VII. His father purchased a new bicycle for him on his birthday. After few months, he found that the cycle chain and the handle gets rusted. His father advised him to apply a coating of paint to the cycle and not to keep it in the open in future.
Now, answer the following questions
(i) Why his cycle gets rusted?
(ii) What do you mean by rusting of iron?
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Q 333 Marks Question3 Marks
Give an example of a chemical reaction for each of the following situations
(i) A change in colour is observed.
(II) A gas is evolved.
(III) Sound is produced.
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Q 343 Marks Question3 Marks
Give two examples for each of the following cases
(i) Physical changes, which are reversible.
(ii) Physical changes, which are not reversible.
(iii) Chemical changes
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Q 353 Marks Question3 Marks
Amit dissolved sugar in water and observed the change. His friend Raj took a little sugar in a spatula and directly heated it on a bunsen burner on a high flame.
Answer the following questions.
(i) Which type of changes is observed by the Amit? Is it reversible or irreversible?
(ii) Who of the two will observe chemical change?
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Q 36Match the Following.4 Marks
Column IColumn II
A. Irreversible1. Physical change
B. Galvanisation2. Crystallisation
C. Melting of wax3. Red litmus to blue
D. Purification of copper sulphate4. Rust
 5. Zinc
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Q 37Match the Following.4 Marks
Column IColumn II
A. Large crystals1. Galvanisation
B Depositing a layer of zinc on iron2. Chemical change
C. Souring of milk3. Turn lime water milky
D. Carbon dioxide4. Sugar candy (mishri)
 5. Physical change
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Q 38Match the Following.4 Marks
Match the Column I with Column II.
Column IColumn II
A. A protective shield1. Chemical change
B. Brownish coating on iron2. Crystallisation
C. Impure solid to pure solid3. Rust
D. Evolution of heat4. Ozone
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Q 395 Marks Questions5 Marks
If you leave a piece of iron in the open for a few days, it acquires a film of brownish substance, called rust.
(i) Do you think rust is different from iron?
(ii) Can you change rust back into iron by some simple method?
(iii) Do you think formation of rust on iron is a chemical change?
(iv) Give two other examples of a similar type of change.
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Q 415 Marks Questions5 Marks
Which type of change takes place in the following and state whether the energy is evolved or absorbed during the change?
Burning of a candle, lightning of a bulb, preparation of food by green plants, volcanic eruption, evaporation of petrol, burning of LPG.
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