MEDIUM
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Why is evaporation a physical change?

Important Questions on Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.

EASY
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
Write down the process of evolution of fossil fuels on Earth.
MEDIUM
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
Write any four differences between nuclear fusion and nuclear fission.
MEDIUM
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
List any three differences between nuclear fission reaction and nuclear fusion reaction.
EASY
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
By what name is biogas popularly known in India?
EASY
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
Nowadays bio-diesel is used in transportation vehicles as an alternate to diesel. Write two advantages of this measure.
EASY
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
Write the name of two elements used as nuclear energy.
EASY
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
Name two uses biogas.
MEDIUM
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
Useful substance in preparation of freezing mixture is 
MEDIUM
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
Explain how is nuclear energy generated in power reactors. How is electricity produced from nuclear energy?
EASY
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
Uranium is used to obtain:
MEDIUM
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
Write a short note on: Nuclear Energy
EASY
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Write down the two benefits of use of solar energy.

EASY
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
 State two ways to prevent the rusting of iron.
EASY
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
Which of the following is not an example of a biomass energy source?
EASY
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
Which one of the following is an example of Biomass energy source.
EASY
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
Which of the following is not an example of a bio-mass energy source?
EASY
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

Write names of any two energies produced in ocean.

MEDIUM
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

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
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.

A solid is heated from 0° to 100°C. Its volume increases from V1 to V2. It is now cooled to 0°C. Will its volume at 0°C be V1 or V2?

MEDIUM
Physical Sciences>Matter and Its Interactions>Gather and make sense of information to describe that synthetic materials come from natural resources and impact society.>Structure and Properties of Matter - Each pure substance has characteristic physical and chemical properties (for any bulk quantity under given conditions) that can be used to identify it.
State the characteristics of physical change and chemical change.