Class IX Study Notes

Free Online Practice of CBSE Class 9 Science Sample Test Papers, Questions with Solutions, Study Notes & Worksheets based on NCERT Books & Syllabus.

After reading these Class 9 Science Study Notes, you can take a quick Online Test to check your understanding of the chapter & subject.

Motion

Motion

IMPORTANT TERMS

Motion

Change of position is called motion. It can be best described in terms of distance moved or displacement. Change in position is taken with respect to an object at rest which is called reference point.

Uniform Motion: Body covers equal distance in equal time interval.

Non-Uniform Motion: Body covers unequal distance Read more...

Matter in Our Surroundings

MATTER IN OUR SURROUNDINGS

IMPORTANT TERMS

Matter: - Anything that occupies space and have mass is called matter.

Diffusion: -The process of intermixing of particles of two or more substances on their own is called diffusion.

Density: - The mass per unit volume of a substance is called density. Its unit are kg/cubic cm.

Pressure: Read more...

Why Do We Fall Ill

WHY DO WE FALL ILL

IMPORTANT TERMS

Health: - According to the World Health Organisation (WHO), health is a state of complete physical, mental and social well-being and not merely an absence of disease or infirmity.

Disease: - Any deviation from normal functioning or state of complete physical, mental or social well-being is Read more...

Gravitation

GRAVITATION

IMPORTANT TERMS

Gravitation: - Every object in the universe attracts other object by a force of attraction called gravitation.

Free fall: - When an object falls from a height under the influence of gravitational force only, it is known as free fall.

Mass: - The total content of an object is called mass. Read more...

Is Matter Around Us Pure

IS MATTER AROUND US PURE

IMPORTANT TERMS

Matter                         Anything which has a mass and occupies space is called matter.

Pure substance            A pure substance is a material that has constant composition and has consistent properties throughout the sample.

Element                       An element is a basic form of matter that cannot be broken down into simpler Read more...

Diversity in Living Organism

DIVERSITY IN LIVING ORGANISMS

IMPORTANT TERMS

Biodiversity                  Biodiversity means variety and variability of various lives on Earth.

Classification                Classification is the arrangement of organisms into groups and subgroups on the basis of their similarities and dissimilarities. 

Kingdom                      It is a taxonomic category having the highest ranking in which all forms of life having certain Read more...

Food Resources

 

FOOD RESOURCES

IMPORTANT TERMS

Sustainable Agriculture:- It is successful management of resources for agriculture to satisfy the requirements of human needs, while maintaining the quality of environment and conserving natural resources.

Green Revolution:- It is a programme to increase food-grain production by use of modern technology, high yield variety of seed, fertilizers and improved Read more...

Cell-Fundamental Unit of Life

Cell - Fundamental Unit of Life

IMPORTANT TERMS

Prokaryotic Cell: - It lacks a membrane bound nucleus. Membrane bound cell organelles are also absent. Their chromosomes are composed of only nucleic acid, and they have only very small ribosomes as organelles.

Eukaryotic Cell: - It has nucleus and other organelles enclosed within membranes. Their chromosomes are Read more...

Force

FORCE AND LAWS OF MOTION

IMPORTANT TERMS

Force: - Pull or push of an object is called force.

Balanced force: - If the resultant of all forces acting on a body is zero, then the forces are called balanced forces.

Unbalanced Force: - If the resultant forces acting on a body is not zero, then Read more...

Sound

SOUND

IMPORTANT TERMS

Sound:-                  It is produced due to the vibration of objects. Vibration is the rapid to and fro motion of an object.

Human Sound:-       The sound of human voice is produced due to the vibration of the vocal cords. The vocal cords are also known as vocal folds or voice reeds.

Audible Read more...

Natural Resources

NATURAL RESOURCES

IMPORTANT TERMS

Biosphere:           It is a life-supporting zone of the earth where the atmosphere, hydrosphere and lithosphere interact and make life possible.

 Air pollution:                 An undesirable change in the physical, chemical or biological characteristics of the air making it harmful for the living organisms is termed as air pollution.

Water pollution:           Read more...

Work and Energy

WORK AND ENERGY

IMPORTANT TERMS

Work: In physics, work is defined as an activity where a force acting on a body produces displacement in it.

Energy: Energy is the capacity of a physical system to do work.

Kinetic Energy: The kinetic energy of an object is the energy that it possesses due to its motion.

Potential Energy: The potential energy of an object Read more...