1. When “current is switched” on in a “room heater” it produces heat due to “the heating effect” of the electric current.
2. Longer line in the symbol for a cell represents its positive terminal.
3. An image that cannot be obtained on a screen is called virtual image.
4. Image formed by a convex lens is always virtual and smaller in size.
5. Images formed by a concave lens cannot be obtained on a screen as they are virtual.