LED QUIZ

1. The material used for white LED is

A. GaAs
B. GaAsP
C. GaP
D. Blue/UV Diode with yellow phosphorus

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D. Blue/UV Diode with yellow phosphorus

2. The material used for ultraviolet LED is

A. AlN
B. AlGaN
C. AlGaInN
D. All of the above

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D. All of the above

3. LED is a type of

A. Zener Diode
B. Gunn Diode
C. Varacter Diode
D. P-N junction Diode

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D. P-N junction Diode

4. LED device spectral response is given by a graph between

A. Light output Vs wavelength
B. Light output Vs Forward Voltage (V_F)
C. Light output Vs Forward Current (I_F)
D. Light output Vs Reverse Voltage (V_R)

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D. Light output Vs Reverse Voltage (V_R)

5. The colour emitted by LED is decided by

A. Forward Current
B. Forward Voltage
C. Material used
D. wavelength of the input voltage

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C. Material used

6. The material used for Red LED is

A. GaP
B. GaAsP
C. AlGaAs
D. All of the above

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D. All of the above

7. The material used for Orange LED is

A. GaP
B. GaAsP
C. AlGaInP
D. All of the above

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D. All of the above

7. The material used for Blue LED is

A. ZnSe
B. InGaN
C. SiC
D. All of the above

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D. All of the above

9. The material used for Green LED is

A. GaN
B. GaP
C. InGaN
D. All of the above

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D. All of the above

10. Purple LED can be formed by

A. Dual blue/red LEDs
B. White with purple plastic
C. Blue with red phosphorus material
D. All of the above

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D. All of the above