Class 7 Physical And Chemical Changes CBSE Questions & Answers

Class 7 · Physical And Chemical Changes

This is Science Class 7 Physical and Chemical Changes CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Blue vitriol is common name of
  • A
    Magnesium oxide
  • B
    Iron sulphate
  • C
    Copper carbonate
  • D
    Copper sulphate
    Correct
2
Chemical name of \({{\text{H}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}\) is
  • A
    Hydrochloric acid
  • B
    Acetic acid
  • C
    Sulphuric acid
    Correct
  • D
    Nitric acid
3
Setting milk into curd is an example of
  • A
    Spontaneous change
  • B
    Physical change
  • C
    Chemical change
    Correct
  • D
    Undesirable change
4
Which group of change included only chemical change?
  • A
    Melting of ice, burning of paper and rusting of iron
  • B
    Burning of paper, rusting of iron and ripening of fruits
    Correct
  • C
    Dissolving of sugar, burning of paper and rusting of iron
  • D
    Burning of paper, melting of ice and rusting of iron
5
All physical changes are
  • A
    Irreversible
  • B
    Irregular
  • C
    Permanent
  • D
    Reversible
    Correct
6
Copper sulphate + iron \( \to \) Iron sulphate + ?
  • A
    Copper oxide
  • B
    Copper
    Correct
  • C
    Iron oxide
  • D
    Copper sulphide
7
Souring of milk is a
  • A
    Undesirable change
    Correct
  • B
    Desirable change
  • C
    Periodic change
  • D
    Physical change
8
Mixture of ice and common salt is called
  • A
    Freezing complex
  • B
    Adding mixture
  • C
    Freezing mixture
    Correct
  • D
    Melting mixture
9
A film of brownish substance on the iron articles left open in humid condition is called
  • A
    Rust
    Correct
  • B
    Husk
  • C
    Flasks
  • D
    Musk
10
In Chemical reaction, reactants change into
  • A
    Mixture
  • B
    Compound
  • C
    Complex
  • D
    Product
    Correct
11
Changing of milk into curd is a type of
  • A
    Structural change
  • B
    Composition change
  • C
    Chemical change
    Correct
  • D
    Physical change
12
Rusting of iron is
  • A
    Irreversible change
    Correct
  • B
    Fast change
  • C
    Reversible change
  • D
    Physical change
13
Which one is an example of slow change
  • A
    Melting of ice
  • B
    All of above
  • C
    Ripening of fruit
    Correct
  • D
    Melting of wax
14
Rotation of fan blade is a
  • A
    Physical change
  • B
    Slow change
  • C
    Periodic change
    Correct
  • D
    Chemical change
15
Two essential condition for rusting of iron is
  • A
    Water and low temperature
  • B
    Hydrogen and oxygen
  • C
    Water and carbon dioxide
  • D
    Air and moisture
    Correct