MEDIUM
Earn 100

Why is iron heated? Think and write here.

Important Questions on Changes Around Us

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

Write names of any two energies produced in ocean.

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

Write down the two benefits of use of solar energy.

EASY
Science>Chemistry>Changes Around Us>Reversible and Irreversible Changes
On heating the volume/size of most substances _____(increases/decreases).
MEDIUM
Science>Chemistry>Changes Around Us>Reversible and Irreversible Changes
How is a metal rim fixed tightly over a wooden wheel?