LED

LED means

• Light Emitting Display

• Light Emitting Diode

• Laser Emitting Display

• Laser Emitting Diode

Semi- conductors are materials which

• can conduct current completely

• can block current

• can conduct current partially

• none of these

............................is not an example of electronic component

• bulb

• diode

• mirror

• resister

Symbol of LED

• 
• 
• 
• None of these

doping is the process of

• combination of electrons

• adding impurities

• removing electrons

• all these

Electroluminescence is the process of

• producing light and heat from current

• producing current

• producing light with from current without heat

• producing heat from current

Advantages of LED

• High energy efficiency

• Long lifespan

• Law radiated heat

• All of these

LED will work only if it is connected to a battery in

• Forward biased

• Reverse biased

• Both case

• Without battery

Short leg of LED is

• Anode

• Cathode

• Emitter

• Collector

The colour of LED depends on

• Colour of battery

• Colour of Gas used in it

• Based on doping material

• None of these