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
In chemical changes
  • A
    New substance with different shape is formed
  • B
    No change in chemical properties takes place
  • C
    New substance with new property is formed
    Correct
  • D
    No new substance with different colour is formed
2
Respiration is a ____________ change as energy is released.
  • A
    Exothermic
    Correct
  • B
    Periodic
  • C
    Endothermic
  • D
    Reversible
3
Colour of copper sulphate solution change when iron nail is added to it due to
  • A
    Displacement of iron by copper
  • B
    Displacement of copper by iron
    Correct
  • C
    Physical change of copper sulphate
  • D
    Formation of precipitate
4
The change in which energy is absorbed from the surrounding is called
  • A
    Reversible reaction
  • B
    Slow reaction
  • C
    Exothermic reaction
  • D
    Endothermic reaction
    Correct
5
Changing of buds into flower is
  • A
    Undesirable change
  • B
    Fast change
  • C
    Periodic change
  • D
    Desirable change
    Correct
6
Anaerobic bacteria digest animal waste and produce
  • A
    Hydrogen gas
  • B
    Bio gas
    Correct
  • C
    Producer gas
  • D
    Sulphur dioxide gas
7
When we turn on bulb the filament changes its colour and becomes bright, is it a chemical change like burning?
  • A
    No, filament does not change into something new
    Correct
  • B
    Yes, it is a chemical change.
  • C
    Yes, filament burns itself like wood to give light
  • D
    No, filament burn itself but that is not a chemical change
8
Why physical properties of different substance are is different?
  • A
    Due to difference in the shape and size of atoms
  • B
    Due to difference in shape and size
  • C
    Due to difference in the structure of molecules
    Correct
  • D
    Due to change in temperature
9
When a change of colour takes place
  • A
    It a chemical change if new substance is formed
    Correct
  • B
    It is always a desirable change
  • C
    It is always a physical change
  • D
    It is always a chemical change
10
Which of the following statement is true for a physical change?
  • A
    More than one substance must be present
  • B
    It change a substance into different substance
  • C
    It alter the form and appearance of the substance
    Correct
  • D
    Burning is an example
11
Stretching a rubber band to increase its length is a
  • A
    Chemical change
  • B
    Permanent change
  • C
    Slow change
  • D
    Physical change
    Correct
12
The property such as shape, size, colour and state of a substance are called its
  • A
    Physical properties
    Correct
  • B
    Chemical properties
  • C
    Natural properties
  • D
    Structural properties
13
When piece of paper is cut into small pieces, it can not be change into original shape although it is physical change because
  • A
    Size of paper reduced
  • B
    Nature of paper changes
  • C
    Property of paper remain same
    Correct
  • D
    Colour of paper remained same
14
Do all physical properties change in physical changes?
  • A
    No, all physical properties may not change
    Correct
  • B
    Yes, only change in melting point takes place
  • C
    Yes, all physical properties changes
  • D
    No, only change in shape takes place
15
We use perfume on clothes as it smell nice. What kind of change is it?
  • A
    Temporary change
    Correct
  • B
    Chemical change
  • C
    Reversible change
  • D
    Permanent change