15-16.04.18 JPSC (Jharkhand) Current Affairs

JHARKHAND State deploys over 12000 extra forces   To ensure free and fair local body elections on April 16, over 12,000 additional police personnel will be deployed in different districts all over the State with instructions to deal strictly with Read More …

22.11.17 JPSC (Jharkhand) Current Affairs

JHARKHAND   Gift Milk scheme is Launched at Jharkhand   ð  Chief Minister Raghubar Das said that the Government has already started the process for a ‘White Revolution’ in the State and it will begin exporting milk outside the State Read More …

Concept and nature of sound.Wave length and frequency, infrasonic and Ultrasonic sounds, Sources of Infrasonic sound In nature, Ultrasonic sound characteristics and some applications.

Sound is a longitudinal wave, in which the particles oscillate to and fro in the same direction of wave propagation. Sound waves cannot be transmitted through vacuum. The transmission of sound requires at least a medium, which can be solid, liquid, Read More …

Solar system, relative position of Earth with respect to Sun and other planets, movement of earth and moon in solar system, lunar and solar eclipses

The solar system consists of the Sun and its eight main planets, their satellites, asteroids, comets, meteors and other dwarf planets. The Sun is at the one of the two “centers” of the Solar system and the planets revolving around Read More …

Definition of speed,velocity, gravity, mass, weight, force, impact, work, power and energy

Speed An object is said to be in motion if it changes its position with time, with respect to its surroundings.Speed is defined as the distance moved per unit time, i.e Speed =Distance /Time When we say that an object Read More …

System of Units: MKS, CGS and SI

Measurement of any physical quantity involves comparison with a certain basic, arbitrarily chosen, internationally accepted reference standard called unit. The result of a measurement of a physical quantity is expressed by a number (or numerical measure) accompanied by a unit. Read More …