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 a chemical change
  • A
    Energy is either absorbed or given out
    Correct
  • B
    Energy is always absorbed
  • C
    Energy is given out
  • D
    Energy change do not occur
2
Which of the following is a chemical change?
  • A
    Melting of ice
  • B
    Changing of water into ice
  • C
    Dissolving of common salt into water
  • D
    Rusting of iron
    Correct
3
Physical changes are
  • A
    Reversible
    Correct
  • B
    Periodic
  • C
    All of these
  • D
    Irreversible
4
Chemical change are characterised by
  • A
    Absorption of energy
  • B
    Formation of new substance
    Correct
  • C
    Release of energy
  • D
    Reversible
5
Which one is a periodic change?
  • A
    Dissolving sugar in water
  • B
    Melting of ice
  • C
    Change in season
    Correct
  • D
    Change in season
6
The product formed by dissolving a substance into another is called
  • A
    Solution
    Correct
  • B
    Solution
  • C
    Compound
  • D
    Solvent
7
Rusting of iron is a slow change but burning of petrol is a
  • A
    Physical change
  • B
    Periodic change
  • C
    Momentary change
  • D
    Fast change
    Correct
8
Ripening of fruit is a
  • A
    Slow and physical change
  • B
    Fast and desirable change
  • C
    Undesirable and fast change
  • D
    Slow and desirable change
    Correct
9
During chemical changes, ________________ change may not take place.
  • A
    Colour
  • B
    Heat
  • C
    Size and shape
    Correct
  • D
    Temperature
10
Electric wires or telephone wire became tight during winter and sag a little during summers because metal
  • A
    Remain same on heating
  • B
    Expand on heating
    Correct
  • C
    Change in shape on heating.
  • D
    Contract on heating
11
The process of converting gas into liquid is called
  • A
    Cooling
  • B
    Evaporation
  • C
    Freezing
  • D
    Condensation
    Correct
12
The chemical name of Baking soda is
  • A
    Sodium hydrogen carbonates
    Correct
  • B
    Calcium carbonate
  • C
    Sodium carbonate
  • D
    Calcium hydrogen carbonate
13
Air is a
  • A
    Element
  • B
    Mixture
    Correct
  • C
    Compound
  • D
    Colloid
14
Tearing of paper in small pieces is an example of
  • A
    Physical change
    Correct
  • B
    Chemical change
  • C
    Endothermic
  • D
    Exothermic
15
Magnesium ribbon burns with
  • A
    Black fume
  • B
    Brilliant white light
    Correct
  • C
    Dull white light
  • D
    Red bright light