Question 1

What is a diode?

Accepted Answer

An electronic component that allows current to flow in only one direction.

Answer

A type of battery.

Answer

A sensor that detects light.

Answer

A device that regulates voltage.

Question 2

What is the purpose of a diode?

Accepted Answer

To convert AC current to DC current.

Answer

To measure resistance.

Answer

To store energy.

Answer

To amplify signals.

Question 3

What is the voltage drop across a silicon diode in forward bias?

Accepted Answer

0.7 volts.

Answer

1.5 volts.

Answer

3 volts.

Answer

5 volts.

Question 4

What happens to a diode in reverse bias?

Accepted Answer

It blocks current flow.

Answer

It emits light.

Answer

It generates a magnetic field.

Answer

It allows current to flow.

Question 5

What is a Zener diode?

Accepted Answer

A diode that operates in reverse breakdown.

Answer

A diode that amplifies signals.

Answer

A diode that measures resistance.

Answer

A diode that stores energy.

Question 6

What is the full name of LED?

Accepted Answer

Light Emitting Diode

Answer

Luminous Emotion Display

Answer

Laser Emitting Device

Answer

Light Emitting Device

Question 7

What is the basic principle of LED?

Accepted Answer

Electroluminescence

Answer

Thermoluminescence

Answer

Radioluminescence

Answer

Photoluminescence

Question 8

Which material is used as a semiconductor in LED?

Accepted Answer

Gallium Arsenide

Answer

Silicon

Answer

Copper

Answer

Germanium

Question 9

What is the color of LED when Gallium Phosphide is used as a semiconductor?

Accepted Answer

Red

Answer

Blue

Answer

Green

Answer

Yellow

Question 10

What is the color of LED when Indium Gallium Nitride is used as a semiconductor?

Accepted Answer

Blue

Answer

Red

Answer

Yellow

Answer

Green

Question 11

What is the efficiency of LED compared to traditional incandescent light bulbs?

Accepted Answer

Higher

Answer

Lower

Answer

Same

Answer

Depends on the color

Question 12

Which type of LED is used in traffic lights?

Accepted Answer

High Power LED

Answer

Infrared LED

Answer

Ultra Violet LED

Answer

Low Power LED

Question 13

What is the lifespan of LED?

Accepted Answer

More than 50,000 hours

Answer

Between 20,000 and 30,000 hours

Answer

Between 30,000 and 40,000 hours

Answer

Less than 10,000 hours

Question 14

What is the advantage of using LED in electronic devices?

Accepted Answer

Lower power consumption

Answer

Better sound quality

Answer

Higher power consumption

Answer

Faster processing speed

Question 15

What type of energy is emitted by an LED?

Accepted Answer

Light energy

Answer

Heat energy

Answer

Kinetic energy

Answer

Sound energy

Question 16

What colors can LEDs emit?

Accepted Answer

All colors of the rainbow

Answer

Only blue and yellow

Answer

Only red and green

Answer

Only black and white

Question 17

What happens when an LED is reverse-biased?

Accepted Answer

It does not emit light

Answer

It changes color

Answer

It emits more light

Answer

It explodes

Question 18

What is the band gap of an LED?

Accepted Answer

The energy difference between its valence and conduction bands

Answer

The amount of current flowing through it

Answer

The distance between its electrodes

Answer

The wavelength of its emitted light

Question 19

Which of the following is a common use for LEDs?

Accepted Answer

Indicator lights

Answer

Water filtration

Answer

Heating appliances

Answer

Vehicle tires

Question 20

What is the efficiency of an LED compared to an incandescent bulb?

Accepted Answer

LEDs are more efficient

Answer

Neither are efficient

Answer

Incandescent bulbs are more efficient

Answer

Both are equally efficient

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