EASY
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Physical changes are generally irreversible changes whereas chemical changes are reversible changes.

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Important Questions on Physical and Chemical Changes

EASY
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
Write down the process of evolution of fossil fuels on Earth.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
Write any four differences between nuclear fusion and nuclear fission.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
List any three differences between nuclear fission reaction and nuclear fusion reaction.
EASY
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
By what name is biogas popularly known in India?
EASY
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
Nowadays bio-diesel is used in transportation vehicles as an alternate to diesel. Write two advantages of this measure.
EASY
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
Write the name of two elements used as nuclear energy.
EASY
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
Name two uses biogas.
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
Useful substance in preparation of freezing mixture is 
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
Explain how is nuclear energy generated in power reactors. How is electricity produced from nuclear energy?
EASY
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
Uranium is used to obtain:
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
Write a short note on: Nuclear Energy
EASY
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change

Write down the two benefits of use of solar energy.

EASY
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
 State two ways to prevent the rusting of iron.
EASY
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
Which of the following is not an example of a biomass energy source?
EASY
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
Which one of the following is an example of Biomass energy source.
EASY
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
Which of the following is not an example of a bio-mass energy source?
EASY
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change

Write names of any two energies produced in ocean.

MEDIUM
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change

Which of the following are physical changes?

(a) Melting of iron metal        (b) Rusting of iron

(c) Bending of an iron rod     (d) Drawing a wire of iron metal

HARD
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
What is the difference between a physical change and a chemical change?
MEDIUM
Science>Chemistry>Physical and Chemical Changes>Characteristics of a chemical change
Give two examples in which a physical change and a chemical change occur simultaneously.