Class 6 Changes Around Us CBSE Questions & Answers

Class 6 · Changes Around Us

This is Science Class 6 Changes around Us CBSE Questions & Answers. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
On the basis of composition, matter is classified as
  • A
    Solution, suspension and colloid
  • B
    Element, metal and compound
  • C
    Metal, non metal and metalloid
  • D
    Element, compound and mixture
    Correct
2
The property such as change in nature, chemical composition and temperature are called
  • A
    Chemical properties
    Correct
  • B
    Biological properties
  • C
    Natural properties
  • D
    Physical properties
3
Water is a compound because its
  • A
    Constituents are in fixed ratio
    Correct
  • B
    Constituents are fixed state
  • C
    Constituents are present everywhere
  • D
    Constituents are variable with temperature
4
Air can be compressed easily because
  • A
    Strong force of attraction is present between particles
  • B
    Particles are away from each other
    Correct
  • C
    Particles are smaller in size
  • D
    Particles are of larger size
5
Dissolving salt in water is physical change because
  • A
    Salt is solid but water is liquid
  • B
    No new substance is formed
    Correct
  • C
    Change is shape and size takes place
  • D
    New substance with new feature is formed
6
The process of converting gas into liquid is called
  • A
    Condensation
    Correct
  • B
    Evaporation
  • C
    Freezing
  • D
    Cooling
7
Heating of iron and Sulpher to form Iron sulphide
  • A
    Physical change
  • B
    Periodic change
  • C
    Chemical change
    Correct
  • D
    Slow change
8
Which change can be easily reversed?
  • A
    Physical changes
    Correct
  • B
    Neither physical nor chemical changes
  • C
    Both physical and chemical changes
  • D
    Chemical changes
9
When a new substance is formed with different properties than original substance the change is called a
  • A
    Undesirable change
  • B
    Chemical change
    Correct
  • C
    Physical change
  • D
    Desirable change
10
What characteristic best describe the change during physical changes?
  • A
    Composition remain same
    Correct
  • B
    Change in composition
  • C
    Change in forms
  • D
    Loss in mass
11
What property remains same during physical and chemical change?
  • A
    Colour
  • B
    Mass
    Correct
  • C
    Shape
  • D
    Density
12
Two solutions are mixed together to form a new solution in which heat is evolved. This tells that
  • A
    Chemical change is taking place
    Correct
  • B
    A gas is being evolved
  • C
    Physical change is taking place
  • D
    Solution are insoluble
13
A physical change occurs when
  • A
    The identity of a substance changes but its appearance does not
  • B
    The appearance of a substance changes but its identity does not
    Correct
  • C
    Neither appearance nor identity change
  • D
    Both identity and its identity change
14
Baking soda is added to vinegar solution, hissing sound is produce due to evolution of
  • A
    Water vapour
  • B
    Nitrogen dioxide gas
  • C
    Hydrogen gas
  • D
    Carbon dioxide gas
    Correct
15
When carbon dioxide gas is passed through lime water, the lime water turns
  • A
    Milky
    Correct
  • B
    Remain colourless
  • C
    Form precipitate
  • D
    Hydrogen gas is evolved