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
Which of the following is a reversible change?
  • A
    Melting of ice
    Correct
  • B
    Germination of seed
  • C
    Changing of milk into curd
  • D
    Burning of matchstick
2
The substance that participate in chemical reaction is/are called
  • A
    Products
  • B
    Reactant
    Correct
  • C
    Solution
  • D
    Solute
3
The property such as change in nature, chemical composition and temperature are called
  • A
    Physical properties
  • B
    Natural properties
  • C
    Biological properties
  • D
    Chemical properties
    Correct
4
Water is a compound because its
  • A
    Constituents are fixed state
  • B
    Constituents are present everywhere
  • C
    Constituents are variable with temperature
  • D
    Constituents are in fixed ratio
    Correct
5
Air can be compressed easily because
  • A
    Strong force of attraction is present between particles
  • B
    Particles are smaller in size
  • C
    Particles are of larger size
  • D
    Particles are away from each other
    Correct
6
In a chemical change
  • A
    Energy is always absorbed
  • B
    Energy is given out
  • C
    Energy change do not occur
  • D
    Energy is either absorbed or given out
    Correct
7
Dissolving salt in water is physical change because
  • A
    Change is shape and size takes place
  • B
    New substance with new feature is formed
  • C
    No new substance is formed
    Correct
  • D
    Salt is solid but water is liquid
8
Magnesium ribbon burns in air to form magnesium oxide. It is an example of
  • A
    Physical change
  • B
    Slow change
  • C
    Periodic change
  • D
    Chemical change
    Correct
9
Melting of wax is a physical change but burning of candle is chemical because
  • A
    Burning of candle forms carbon dioxide
    Correct
  • B
    Burning of candle reduce in size
  • C
    Burning of candle produce heat
  • D
    Burning of candle cause lightening
10
Which of the following is not a characteristic of chemical change?
  • A
    Change in colour
  • B
    Evolution of heat
  • C
    Permanent change
  • D
    Change in size and shape
    Correct
11
Sodium : Na :: ? : Potassium
  • A
    K
    Correct
  • B
    Ca
  • C
    Pt
  • D
    P
12
Heating of iron and Sulpher to form Iron sulphide
  • A
    Chemical change
    Correct
  • B
    Periodic change
  • C
    Physical change
  • D
    Slow change
13
Which of the following is a chemical change
  • A
    Melting of ice-cream
  • B
    Tearing of paper
  • C
    Freezing of water
  • D
    Rusting of iron
    Correct
14
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
15
When a new substance is formed with different properties than original substance the change is called a
  • A
    Desirable change
  • B
    Chemical change
    Correct
  • C
    Undesirable change
  • D
    Physical change