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CBSE Important Questions

Find important questions with answers for CBSE Class 9 Science for session 2018 – 2019. These important questions for class IX Science are value based questions and prepared by team of teachers and subject experts.

Chapter-1 Matter in Our Surroundings

Definition of matter; solid, liquid and gas; characteristics - shape, volume, density; change of state-melting (absorption of heat), freezing, evaporation (cooling by evaporation), condensation, sublimation.

Chapter-2 Is Matter Around Us Pure

Elements, compounds and mixtures. Heterogeneous and homogeneous mixtures, colloids and suspensions.

Chapter-3 Atoms and Molecules

Atoms and molecules, Law of constant proportions, Atomic and molecular masses. Mole concept : Relationship of mole to mass of the particles and numbers.

Chapter - 4 Structure of the atom

Electrons, protons and neutrons, valency, chemical formula of common compounds. Isotopes and Isobars.

Chapter-5 The Fundamental Unit of Life

Cell as a basic unit of life; prokaryotic and eukaryotic cells, multicellular organisms; cell membrane and cell wall, cell organelles; chloroplast, mitochondria, vacuoles, endoplasmic reticulum, Golgi apparatus; nucleus, chromosomes - basic structure, number.

Chapter - 6 Tissues, Organs, Organ System, Organism

Structure and functions of animal and plant tissues (four types in animals; meristematic and permanent tissues in plants).

Chapter - 7 Diversity in Living Organisms

Diversity of plants and animals - basic issues in scientific naming, basis of classification. Hierarchy of categories / groups, Major groups of plants (salient features) (Bacteria, Thalophyta, Bryo phyta, Pteridophyta, gymnosperms and Angiosperms). Major groups of animals (salient features) (Non-chordates upto phyla and chordates upto classes).

Chapter - 8 Motion

Distance and displacement, velocity; uniform and non-uniform motion along a straight line; acceleration, distance-time and velocity-time graphs for uniform motion and uniformly accelerated motion, equations of motion by graphical method; elementary idea of uniform circular motion.

Chapter - 9 Force and laws of Motion

Force and Motion, Newton's Laws of Motion, Action and reaction forces, Inertia of a body, Inertia and mass, Momentum, Force and Acceleration. Elementary idea of conservation of Momentum.

Chapter - 10 Gravitation

Gravitation; universal law of gravitation, force of gravitation of the earth (gravity), acceleration due to gravity; mass and weight; free fall.

Chapter - 11 Work and energy

Work done by a force, energy, power; kinetic and potential energy; law of conservation of energy.

Chapter - 12 Sound

Nature of sound and its propagation in various media, speed of sound, range of hearing in humans; ultrasound; reflection of sound; echo and SONAR. Structure of the human ear (auditory aspect only).

Chapter - 13 Why Do We Fall ill

Health and its failure. Infectious and Non-infectious diseases, their causes and manifestation. Diseases caused by microbes (Virus, Bacteria and protozoans) and their prevention, Principles of treatment and prevention. Pulse Polio programmes.

Chapter - 14 Natural resources

Air, Water, Soil. Air for respiration, for combustion, for moderating temperatures; movements of air and its role in bringing rains across India.
Air, water and soil pollution (brief introduction). Holes in ozone layer and the probable damages.

Chapter- 15 Improvement in Food Resources

Plant and animal breeding and selection for quality improvement and management; use of fertilizers, manures; protection from pests and diseases; organic farming.

Some Other Important Topics for Class 9-Science

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