chapter 1 science 10th class

We have learnt that a force changes or tends to change the state of rest, speed or direction of motion of an object, i.e., force produces an acceleration. In this chapter, we are going to identify one of the forces which produces acceleration in all objects on the surface of the..

In the physical world, one of the most common phenomena is motion. The branch of Physics, which deals with the behaviour of moving objects, is known as mechanics. Mechanics is further divided into two sections namely Kinematics and Dynamics. Kinematics deals with the study of motion witho..

A chemical formula that represents the composition of a molecule of the substance in terms of the symbols of the elements present in the molecule is also called molecular formula. Discrete molecules can be described by this formula. As it represents one molecule of the substance giving th..

. In the previous chapter one has observed the formation of a chemical bond by the transfer of electrons called the ionic bond. Atoms also acquire the stable noble gas configuration of having eight electrons in the outermost shell (called the octect rule) by mutual sharing of ..

In the previous chapter we have seen how light gets reflected when it is incident on a surface. Now let us see what happens when a ray of light travelling in one medium enters another medium of different optical density. It is a matter of common experience that a spoon plac..

Corrosion :- Many metals are chemically active elements and get easily affected by substances like moisture, air, acids, etc. One must have observed iron articles that are shiny when new, but get coated with a reddish brown powder when left for some time. This process is commonly k..

In 1831, Robert Brown discovered the nucleus in the cell J.E.Purkinje, in 1840, used the term protoplasm to describe the juicy, slimy gelatinous contents of the cell In 1885, Rudolf Virchow expressed that all cells arise from pre-existing cells In 1932, two German Scientists, Ruska and..

Addition of Hydrogen Hydrogen adds to chlorine to form hydrogen chloride gas. Nowadays, one can explain oxidation- reduction in terms of 'electrons transfer', which one will learn later on. Also, it is necessary to point out that oxidation and reduction reactions occur simultane..

A force of 625 N acts on a body of mass 25 kg. Find the acceleration of the body. Solution : Force (F) = 625 N Mass (m) = 25 kg Acceleration (a) = ?F = ma Acceleration = 25 m/s ..

Kilowatt and megawatt are higher units of power. Another unit of power is horse power 1 horse power = 746 wat..