Electric current

Current Electricity Electric current is the rate of flow of electric charge through a conducting medium with respect to time. It is caused by drift of free electrons through a conductor to a particular direction.Charges in motion constitute an electric current. Such currents occur naturally in many situations. Lightning is one such phenomenon in which … Read more Electric current

Mechanical waves- audible, infrasonic, and ultrasonic, their main characteristics

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, or gas. Newton to derive a relation for the velocity of sound in a gaseous … Read more Mechanical waves- audible, infrasonic, and ultrasonic, their main characteristics

India and Its Neighbors

  India has a long land frontier and coastline. It shares boundaries with Pakistan, Nepal, Bhutan, China, Bangladesh, Myanmar (Burma) and Sri Lanka. India has official political relations with most nations. India is considered as the world’s second most populous and democratic country. Foreign policy of India has always regarded the concept of neighbourhood as … Read more India and Its Neighbors

Basic concepts of ecosystem

Eco-System-An ecosystem is defined as a structural and functional unit of biosphere consisting of community of living beings and the physical environment, both interacting and exchanging materials between them. It includes plants, trees, animals, fish, birds, micro-organisms, water, soil, and¬† people. When an ecosystem is healthy (i.e. sustainable) it means that all the elements live … Read more Basic concepts of ecosystem

Plants and mankind, characteristics of plants, structure and function of plant cells and organelles;

  Objects having characteristics of cellular organization, growth, reproduction, ability to sense environment and give response are living organisms. There are some important features of living organisms: It should grow, which means its structure changes as time goes by in an advantageous manner. It should show adaptation to the environment. It should maintain some balanced … Read more Plants and mankind, characteristics of plants, structure and function of plant cells and organelles;

Structure and function of animal cell and cell organelles

  Objects having characteristics of cellular organization, growth, reproduction, ability to sense environment and give response are living organisms. There are some important features of living organisms: It should grow, which means its structure changes as time goes by in an advantageous manner. It should show adaptation to the environment. It should maintain some balanced … Read more Structure and function of animal cell and cell organelles