Tnpsc and Upsc Notes Pdf
Pravin Babu R 
What is an oscillator? The oscillator is a mechanical or electrical apparatus that produces periodic fluctuation. Or it is a device that produces a repeated waveform. This signal can be a sine wave, a square wave, or a triangle wave. Oscillators are used in a wide variety of electronic devices, including clocks, radios, computers, and … Read more
Optoelectric devices The devices that convert electrical energy into light and light into electrical energy through semiconductors. Example of Optoelectric devices is Light-emitting diodes, photodiodes, and solar cells. Light Emitting Diode (LED) LED is a p-n junction diode that emits visible or invisible light when forward biased. The electrical energy is converted into light energy … Read more
Zener diode is a reverse-biased heavily doped silicon diode named after the invention by C.Zener. Zener diode is specially designed to operate in the breakdown region. The doping level of silicon diodes can be varied as per breakdown voltages needed from 2V to 1000 V. The maximum reverse bias applied before entering into the Zener … Read more
Rectification The process of converting alternating current into the direct current is called Rectification. There are two types of rectifiers, one is a half-wave rectifier and the other is a full-wave rectifier. Half-wave Rectifier Circuit The circuit consists of a transformer, a p-n junction diode, and a resistor. In a half-wave rectifier circuit, either a … Read more
There are two types of Semiconductors. They are Intrinsic and Extrinsic semiconductors. Types of Semiconductors Intrinsic Semiconductor Extrinsic Semiconductor Intrinsic Semiconductor A semiconductor in its pure form without impurity is called an intrinsic semiconductor. Here impurity means any other atom in the crystal lattice. Each Silicon atom has four electrons in the outermost orbit and … Read more
Gandhi wanted the central government to have less power and wanted the villages to rule themselves traditionally with village chiefs and councilors. According to Ambedkar, the village possessed a cruel reality of communalism and a caste system, which will lead to problems for the minorities. Gandhi through his social and political initiatives facilitated the county … Read more
The electrons present in the outermost shell of an atom are called Valence electrons. From the Bohr-Bury scheme, we find the outermost shell of an atom can accommodate a maximum of 8 electrons. Also, the atoms of the elements show little chemical activity if its outermost shell is completely filled. Also can be said that … Read more
State government structure in India The state government follows the parliamentary system of government like the central government. Some states have a Bicameral legislature and some states have a Unicameral legislature. The state executive or the state government may consist of: These three executives form the basic structure of government in the states. Kindly check … Read more
In the general election of 1967, the congress party was defeated. The DMK formed the government. The schemes of DMK are affordable universal housing for the poor, a rice scheme that is the precursor to food security, and a slum clearance board has been established. The Government renamed the state of Madras to Tamil Nadu … Read more
Self Respect Movement The self respect Movement is a political movement started by Periyar, in Tamil Nadu, earlier known as Madras Presidency in 1925, with the aim of achieving equal rights for oppressed castes, and rights for women. This movement is a political and social movement aimed at destroying age-old Hindu customs and superstitious activity. … Read more