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Physical and Chemical Changes Science - Physical and Chemical Changes

Gujarat Board (GSEB) - STD 7 - Science (GSEB - English Medium). 378 questions in this chapter.

Question types

Physical and Chemical Changes question types

378 questions across 7 question groups — pick any mix to generate a Science paper with step-by-step answer keys.

378
Questions
7
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 2MCQ (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 3MCQ (1 Marks)1 Mark
The reaction given below is a:
Copper sulphate+Iron→Iron sulphate+Copper
  • ✓
    Chemical change
  • B
    Physical change
  • C
    Both $A$ and $B$
  • D
    We cannot determined

Answer: A.

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Q 4MCQ (1 Marks)1 Mark
Classify the following as physical or chemical change. Metallic sodium is soft enough to be cut with a knife.
  • A
    Chemical
  • ✓
    Physical
  • C
    Both $A$ and $B$
  • D
    None of these

Answer: B.

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Q 5MCQ (1 Marks)1 Mark
When you leave a piece of iron in the open for some time, it acquires a film of brownish substance. The substance is called:
  • A
    Acid
  • B
    Base
  • ✓
    Rust
  • D
    None of these

Answer: C.

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Q 171 Marks Question1 Mark
Anaerobic bacteria digest animal waste and produce biogas (Change – $A$). The biogas is then burnt as fuel (Change – $B$). The following statements pertain to these changes. Choose the correct one.
  • Process – $A$ is a chemical change.
  • Process – $B$ is a chemical change.
  • Both processes $A$ and $B$ are chemical change.
  • None of these processes is a chemical change.
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Q 181 Marks Question1 Mark
The gas we use in the kitchen is called liquefied petroleum gas $(LPG)$. In the cylinder it exists as a liquid. When it comes out from the cylinder it becomes a gas (Change − $A$) then it burns (Change − $B$). The following statements pertain to these changes. Choose the correct one
  • Process − $A$ is a chemical change
  • Process − $B$ is a chemical change.
  • Both processes $A$ and $B$ are chemical changes.
  • None of these processes is a chemical change
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Q 252 Marks Questions2 Marks
Classify the following processes into physical or chemical changes:
  1. Beating of aluminium metal to make aluminium foil.
  2. Digestion of food.
  3. Cutting of a log of wood into pieces.
  4. Burning of crackers.
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Q 273 Marks Question3 Marks
When a candle burns, both physical and chemical changes take place. Identify these changes. Give another example of a familiar process in which both the chemical and physical changes take place.
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Q 315 Marks Questions5 Marks
Classify the changes involved in the following processes as physical or chemical changes:

Photosynthesis

Dissolving sugar in water

Burning of coal

Melting of wax

Beating aluminium to make aluminium foil

Digestion of food

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Q 345 Marks Questions5 Marks
Fill in the blanks in the following statements using the words given in the box.
rusted, colourful, substance, chemical, physical, reversible, iron oxide, object
  1. Making sugar solution is a ____________ change.
  2. A physical change is generally____________.
  3. Grinding of wheat grain changes its size. It is a ____________ change.
  4. Iron benches kept in lawns and gardens get____________. It is a _________ change because a new _________ is formed.
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