MEDIUM
Earn 100

Identify the following change as Physical or Chemical.

 Browning of apples

Important Questions on Is Matter around Us Pure?

EASY
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Which of the following is not an example of a biomass energy source?
EASY
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Name two uses biogas.
EASY
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Write down the process of evolution of fossil fuels on Earth.
MEDIUM
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Write a short note on: Nuclear Energy
MEDIUM
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Explain how is nuclear energy generated in power reactors. How is electricity produced from nuclear energy?
EASY
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
By what name is biogas popularly known in India?
MEDIUM
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
List any three differences between nuclear fission reaction and nuclear fusion reaction.
MEDIUM
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Useful substance in preparation of freezing mixture is 
EASY
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Uranium is used to obtain:
EASY
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Which of the following is not an example of a bio-mass energy source?
EASY
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
 State two ways to prevent the rusting of iron.
EASY
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes

Write names of any two energies produced in ocean.

MEDIUM
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes

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

EASY
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Write the name of two elements used as nuclear energy.
EASY
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Which one of the following is an example of Biomass energy source.
MEDIUM
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Write any four differences between nuclear fusion and nuclear fission.
EASY
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Nowadays bio-diesel is used in transportation vehicles as an alternate to diesel. Write two advantages of this measure.
EASY
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes

Write down the two benefits of use of solar energy.

HARD
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Tabulate the differences between physical and chemical changes.
MEDIUM
Science>Chemistry>Is Matter around Us Pure?>Physical and Chemical Changes
Give two examples in which a physical change and a chemical change occur simultaneously.