RRB JE Mechanical Question Paper 2014 (Set-1) with Answer Key

When this cylinder is viewed from one end, we see a true circle. As the cylinder is tilted away from us, the circle becomes an ellipse. In an isometric projection, a circle appears as an ellipse.

A light-year is a unit of distance. It is the distance that light can travel in one year. Light moves at a velocity of about 300,000 kilometers (km) each second. So in one year, it can travel about 10 trillion km.