speed of light through various mediums

what is tnpsc exam? tnpsc is a government body that conducts exams for the recruitment of staff into state public service. it is the most prestigious exam in the state of tamil nadu. every year over 10 lakh candidates appear in this exam. the various exams are based on the nature of the post such as group-1, group-2, - andedge

movies and science explained, simply and to the point.