Incandescent lamp, discharge lamp , C.F.L, LED lamp, arc lamp are given for observation .
Answer the following questions after observing them.
Which lamps are harmful to envioronment because of the presence of mercury in it ?

Incandescent lamp, discharge lamp , C.F.L, LED lamp, arc lamp are given for observation . Answer the following questions after observing them. Name the lamps which belong to the group of discharge lamp.

Incandescent lamp, discharge lamp , C.F.L, LED lamp, arc lamp are given for observation . Answer the following questions after observing them. Which lamp is used in rescue work during night time and used in search lights ?

Incandescent lamp, discharge lamp , C.F.L, LED lamp, arc lamp are given for observation . Answer the following questions after observing them. Which metal is used to make filament of an incandescent lamp ? What are the advantages of using this metal as a filament ?

Incandescent lamp, discharge lamp , C.F.L, LED lamp, arc lamp are given for observation . Answer the following questions after observing them. The colour of light depends on the gas inside the discharge lamp. Which gases are to be filled for getting white light and yellow light?

Choose and write the facts related to LED lamps from the given list. Require only a small quantity of power , UV rays are produced due to electric discharge , Not harmful to environment since there is no mercury , Intense light is produced when high voltage is applied.

Write down the reasons for the following statements . Nichrome is not used as filament in incandescent lamp.