# CBSE Class 9 Science Chapter Concepts notes

• ### CBSE Class 9 Science Wave Motion And Sound Notes

WAVE MOTION AND SOUND NATUR OF SOUND Sound is a form of energy which effects our sensation of hearing through the ear. The sensation is produced by longitudinal waves in an elastic medium, where the vibrations (oscillations) of the particles are in the same direction in which the wave propagates....

• ### CBSE Class 9 Science Work Energy And Power Notes Set B

WORK, ENERGY AND POWER INTRODUCTION In everyday language, the word work is used to describe any activity in which muscular or mental effort is exerted. In physical, the word work has a special meaning. Work in one done when the force acting on body produced motion in it in the direction of force (...

• ### CBSE Class 9 Science Gravitation And Fluid Notes Set B

GRAVITATION AND FLUID INTRODUCTION Besides developing the three laws of motion, Sir lssac Newton also examined the motion of the heavenly bodes - the planets and the moon. Newton recognized that a force of some kind must be acting on the planets to keep them in nearly circular orbits, otherwise...

• ### CBSE Class 9 Science Force And Laws Of Motion Notes Set B

FORCE AND LAWS OF MOTION FORCE Consider a ball kept on a table, we can move it by pulling or pushing. We can increase its speed by pushing it in the direction of motion. If we push it opposite to the direction of motion its speed will decrease. If the ball is in motion towards east, we push it...

• ### CBSE Class 9 Science Physical Science Notes

PHYSICAL SCIENCE This science deals with the properties and Behaviour of nonliving things. (a) Physics (in Greek Nature): It is the branch of science which deals with the study of the natural laws and their manifestation in the natural phenomenon. Mechanics (oldest branch): If deals with the...

## Latest NCERT & CBSE News

Read the latest news and announcements from NCERT and CBSE below. Important updates relating to your studies which will help you to keep yourself updated with latest happenings in school level education. Keep yourself updated with all latest news and also read articles from teachers which will help you to improve your studies, increase motivation level and promote faster learning

### Re verification of Class 12 Board Exams Marks

Modalities and Schedule for Senior Secondary School (Class XII) Examinations, 2020 in the subjects whose examinations have been conducted by CBSE for the processes of (I) Verification of Marks (II) Obtaining Photocopy of the Evaluated Answer Book(s) (Ill) Re-evaluation...

### Re verification of Class 10 Board Exams Marks

Modalities and Schedule for Secondary School (Class X) Examinations, 2020 in the subjects whose examinations have been conducted by CBSE for the processes of (I) Verification of Marks (II) Obtaining Photocopy of the Evaluated Answer Book(s) (Ill) Re-evaluation of Marks...

### Board Cancelled Official CBSE Statement

Keeping in view the requests received from various State Governments and the changed circumstances as on date, following has been decided- 1. Examinations for classes X and XII which were scheduled from 1st July to 15th, 2020 stand cancelled. 2. Assessment of the...

### Cogito and The Question Book A series on Thinking skills by CBSE

The Board has dedicated this academic session 2020-21 for ‘Competency Based Learning’. Skills connected to Critical & Creative thinking, Problem Solving, Collaboration and Communication are core to successful living in the 21st Century. To focus on the importance...

### CBSE Reduced Syllabus Class 11 and 12

CBSE has announced major reduction in the syllabus for class 11 and class 12. There has been major changes too in the main syllabus for class 11 and 12. The prevailing health emergency in the country and at different parts of the world as well as the efforts to contain...

### Internal Assessments and CBSE Reduced Syllabus

CBSE on 7th July 2020 had announced the ‘Revised Academic Curriculum for classes IX-XII for the session 2020-21’ to mitigate the effect of face to face learning loss due to the closure of schools to contain COVID-19 Pandemic. The rationalization of syllabus up to 30% ...

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