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
Melting of ice is a
  • A
    Physical change
    Correct
  • B
    Chemical change
  • C
    Both physical and chemical change
  • D
    Periodic change
2
Which of these is the smallest particle?
  • A
    A speck of dust
  • B
    A water drop
  • C
    A molecule
  • D
    An atom
    Correct
3
Formation of a compound is
  • A
    Physical change
  • B
    Reversible change
  • C
    Temporary change
  • D
    Chemical change
    Correct
4
Which of the following is a reversible change?
  • A
    Melting of ice
    Correct
  • B
    Burning of matchstick
  • C
    Germination of seed
  • D
    Changing of milk into curd
5
Chemical changes are
  • A
    Always are irreversible
    Correct
  • B
    Always reversible
  • C
    Mostly reversible
  • D
    Mostly irreversible
6
In chemical change
  • A
    Change is reversible
  • B
    Molecules of a substance change
    Correct
  • C
    Substance remain same
  • D
    Molecules of the substance do not change
7
Which of the following is an example of physical change?
  • A
    Ripening of fruit
  • B
    A bud turning into flower
  • C
    Rusting of iron
  • D
    Boiling of water
    Correct
8
Sea water is a
  • A
    Element
  • B
    Compound
  • C
    Mixture
    Correct
  • D
    Molecule
9
Which of the following is a reversible change?
  • A
    Melting of ice
    Correct
  • B
    Burning of match stick
  • C
    Changing of milk into curd
  • D
    Germination of seed
10
Which of the following is an example of chemical change?
  • A
    Woollen yarn to knitted sweater
  • B
    Heating of iron rod
  • C
    Melting of wax
  • D
    Burning of candle wick
    Correct
11
In a chemical change
  • A
    Molecule of substance do not change
  • B
    Substance remain the same
  • C
    Molecule of substance change
    Correct
  • D
    Change is reversible
12
Which of the following is an example of physical change?
  • A
    A bud turning into a flower
  • B
    Boiling of water
    Correct
  • C
    Rusting of iron
  • D
    Ripening of a tomato
13
When water freezes it undergoes a
  • A
    Sublimation
  • B
    Chemical change
  • C
    Vaporisation
  • D
    Physical change
    Correct
14
Which of the following is an example of physical change?
  • A
    Ripening of a tomato
  • B
    A bud turning into a flower
  • C
    Rusting of iron
  • D
    Boiling of water
    Correct
15
Souring of milk is a
  • A
    Periodic change
  • B
    Desirable change
  • C
    Undesirable change
    Correct
  • D
    Physical change