Science Tech

 Relation between focal length and redius of curvature The focal length (f) of a lens is the distance between the center of the lens and the point at which the reflected light, of a beam of light travelling parallel to the center line, meets the center line (principal axis). The radius of curvature … Read more Relation Between Focal Length And Redius Of Curvatur1

 Magnetic keepers A magnet keeper, also known historically as an armature, is a ferromagnetic bar made from soft iron or steel, which is placed across the poles of a permanent magnet to help preserve the strength of the magnet by completing the magnetic circuit; it is important for magnets that have a low … Read more Magnetic Keepers

 Reproductive systems The reproductive system in both males and females consists of structures that produce reproductive cells, or gametes, and secrete sex hormones. A gamete is a haploid cell that combines with another haploid gamete during fertilization. Sex hormones are chemical messengers that control sexual development and reproduction. The male reproductive system consists … Read more Reproductive Systems

 Conventional and New Source of Energy   Energy is one of the most important component of economic infrastructure. It is the basic input required to sustain economic growth. There is direct relation between the level of economic development and per capita energy consumption.   Two Main Sources of Energy:   … Read more Source Of Energy

 Methods of preparing magnets Some magnets can be created using any of the following ways below.   Induction   Stroking   Using electricity   Since these magnets can be made, they are usually referred to as temporary magnets. Electromagnets are magnets made using electricity and so are called temporary magnet since they only … Read more Methods Of Preparing Magnets

 Dry cell A dry cell is an electrochemical cell that uses a low-moisture electrolyte instead of a liquid electrolyte as a wet cell does. This feature makes the dry cell much less prone to leaking and is therefore more suitable for portable applications. The zinc-carbon battery is one of the most common examples … Read more Dry Cell

 Technology with a Human Face Technology and the Human Race The human race has indeed gone far with technology. From the age when he still used wooden and stone tools to a powerful era of silicon and steel, he ceased to be a helpless prey to a number of predators to become a … Read more Technology With A Human Face (1)

 Circulatory System v  The circulatory system can be compared to a system of interconnected, one-way roads that range from superhighways to back alleys. v  Like a network of roads, the job of the circulatory system is to allow the transport of materials from one place to another. v  As described in Figure below, … Read more Circulatory System

 Flood and Drought Occurrence Drought Drought is a complex, slow-onset phenomenon of ecological challenge that affects people more than any other natural hazards by causing serious economic, social and environmental losses in both developing and developed countries. The period of unusual dryness (i.e. drought) is a normal feature of the climate and weather … Read more Flood And Drought Occurance

 NRHM, National HIV Programme NATIONAL RURAL HEALTH MISSION – THE VISION The National Rural Health Mission (2005-12) seeks to provide effective healthcare to rural population throughout the country with special focus on 18 states, which have weak public health indicators and/or weak infrastructure.  These 18 States are Arunachal Pradesh, Assam, Bihar, Chhattisgarh, Himachal … Read more NRHM, National HIV Programme