CBSE ADDA

CBSE PHYSICS:Class IX Work Power and Energy notes(Physics) : Work :   In our daily life anything that makes us tired is known as  work . For example, reading, writing, painting, walking, etc. In physics work (W) is said to be done, when a force (F) acts on the body and point  of application of the force is displaced (s) in the direction of force. Work done = force x displacement     W          =     F       x       s (i) If the body is displaced in the same direction of force, Work done is positive Read more »

CBSE PHYSICS Class 10 Physics The Humane Eyes Notes :   IMPORTANT CONCEPTS: Human eye can be treated as an optical instrument. Light rays coming from the object to be seen enter the eye through Cornea and fall on the eye lens through the pupil of the eye. Eye lens being double convex lens forms a real inverted and smaller image of the object on the retina. The retina contains numerous light sensitive cells which are activated by the light falling on the retina and generate electrical signals which are sent to brain via optic nerve and the brain processes this information and we perceive objects as they are. The human eye has the following parts:- (a) Cornea: -The transparent spherical membrane covering the front of the eye. (b) Iris: -The coloured diaphragm between the cornea and lens. (c) Pupil: -The small hole in the iris. (d) Eye lens: -Its is a transparent lens made of jelly like material. (e) Ciliary muscles: -These muscles hold the lens in position. (f) Retin

Navodaya Vidyalaya Samiti (NVS), an autonomous organization under the Ministry of Human Resource Development, Department of School Education & Literacy, Government of India, invites applications in the prescribed format (Annexure-I), from eligible Indian nationals for filling up of vacancies and drawing a panel of candidates for the posts of Trained Graduate Teachers DIRECT RECRUITMENT BASIS in the Jawahar Navodaya Vidyalayas located in various districts of the country . Website : “www.navodaya.nic.in” Last date for submission of applications is within 30 days from the date of publication of this  advertisement (advertisement published in Employment News dated 24-30 September, 2011). TRAINED GRADUATE TEACHERS SUBJECT-WISE POST CODES FOR FILLING UP THE APPLICATION FORM (REF. COL. NO. 01 & 05 OF APPLICATION FORM) TRAINED GRADUATE TEACHERS POST POST CODE HINDI 01 ENGLISH 02 MATHEMATICS 03 SOCIAL STUDIES 04

8th maths Sample paper term -1-2011

VERY SHORT QUESTIONS CARRYING 1 MARK EACH. 1. Out of  convex mirror  and  concave mirror , whose focus is situated behind the mirror? Ans: The focus of convex mirror is situated behind it. 2. For what position of an object, a concave mirror forms an enlarged virtual image? Ans: Object between pole (P) and focus (F) of the concave mirror. 3. If the  focal length  of a concave mirror is 25cm. What is its radius of curvature? Ans: Focal length = Radius of curvature / 2 25 = R / 2  => R = 50cm. 4. A  ray of light  falls on a mirror normally.  What are the  values of angle of incidence and the angle  of reflection? Ans: Both angle of incidence and the angle of reflection are zero. 5. What is the focal length of a plane mirror? Ans: Infinite. 6. Which spherical mirror is called a divergent mirror? Ans: A convex mirror is called a divergent mirror. 7. What is the angle of incidence, when a ray of light falls on the spherical mirror from its centre  of curvat

Classification of elements: the arrangement of elements in such a manner that elements with similar properties are grouped together while elements with dissimilar properties are separated. EARLY ATTEMPTS OF CLASSIFICATION OF ELEMENTS 1. Lavoisier’s classification of elements: In 1789, Lavoisier first attempted to classify the elements into two divisions namely Metals and Non-metals. However this classification was not satisfactory as there were many exceptions in each category. 2. Dobereiner’s classification of elements: In 1817, Johann Wolfgang Dobereiner grouped three elements into what he termed triads . In each case, the middle element has an atomic mass almost equal to the average atomic masses of the other two elements in the triad. For example, elements like lithium, sodium and potassium have atomic masses 7, 23 and 39 respectively. They are grouped together into a triad as, Li (7) Na (23) K (39) Here the atomic mass of sodium is the average o

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