Atoms and Molecules Notes Laws of chemical combination:- Law of conservation of mass:- It states that mass can neither be created nor be destroyed in a chemical reaction. Or,It states that the total mass of reactants is equal to total mass of products in a chemical reaction. Law of constant proportion:- It states that in […]
Tissues Notes Tissue:- A group of cells that are similar in structure and perform a particular function is called tissue. Differences between plant tissue and animal tissue:- Plant Tissues Animal Tissues Most of the plant tissues are dead that provide mechanical support. Most of the animal tissues are living . Plant tissues consume less energy. […]
Number Systems Important Questions Find three rational number between and . Represent √ 6.4 on the number line. If x = and y = , find the value of x2 + y2 + xy. Express 6.234 in the form of p/q. If x = , find the value of . Find the smallest of the numbers , […]
Sound Notes Sound:- Sound is a form of energy which produces a sensation of hearing in our ears. Vibration:- A kind of rapid to and fro motion of an object is called vibration. Sound is produced by vibrating objects. Wave:- A wave is a disturbance that moves through a medium when the particles of medium […]
Gravitation Notes Gravitational force:- The force of attraction between any two objects in the universe is called gravitational force. Universal law of gravitation:- Every object in the universe attracts every other object with a force which is directly proportional to the product of their masses and inversely proportional to the square of distance between them. […]
Is Matter Around Us Pure Important Questions State the differences between compounds and mixtures. What are alloys? What are the constituents of brass? Differentiate between colloid, solution and suspension. a. What is Tyndall effect? Does true solution exhibit Tyndall effect?b. “Tyndall effect can be seen when sunlight passes through the canopy of forest.” Explain how […]
Is Matter Around Us Pure Notes Pure substance:- A pure substance consists of a single type of particles that cannot be separated into other kinds of matter by any physical process. Types of pure substances:- Element Compound Element:- An element is a basic form of matter that cannot be broken down into simpler substances by […]
The Fundamental Unit of Life Notes Cell:- A cell is the structural and functional unit of life. Cell was discovered by Robert Hooke in 1665. Unicellular organisms:- The single celled organisms are called unicellular organisms. Ex:- Amoeba, Paramoecium, Bacteria, Chlamydomonas etc. Multicellular organisms:- The organisms that are composed of more than one cells are called […]
Work and Energy Important Questions Define 1 watt of power. What is the commercial unit of energy. Convert it to the S.I. unit. Derive the formula for kinetic energy. . State law of conservation of energy. Show that the total mechanical energy for a freely falling body remain constant/conserved. Calculate the total electricity bill amount […]
Work and Energy Notes Work:- Work is said to be done if a force is applied on an object & it displaces in the direction of force applied. S.I. unit:- Joule (J) It is a scalar quantity. Work done = Force x displacement (W = FS) 1 Joule :- The work done on an object […]