Electromagnetism
Current Electricity
MCQ (Single Correct Answer)
Moving Charges and Magnetism
MCQ (Single Correct Answer)
Magnetism and Matter
MCQ (Single Correct Answer)
Electromagnetic Induction
MCQ (Single Correct Answer)
Alternating Current
MCQ (Single Correct Answer)
Electromagnetic Waves
MCQ (Single Correct Answer)
Modern Physics
Dual Nature of Radiation
MCQ (Single Correct Answer)
Semiconductor Devices and Logic Gates
MCQ (Single Correct Answer)
Communication Systems
MCQ (Single Correct Answer)
1
COMEDK 2022
MCQ (Single Correct Answer)
+1
-0

Choose the incorrect statements.

A
Silicon is used in the fabrication of LED.
B
LED works on the principle of electroluminescence.
C
LED is a power efficient device.
D
LED is fabricated with direct band gap semiconductor.
2
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

Find the logic gate, when both the inputs are high but the output is low and vice-versa.

A
AND
B
OR
C
NAND
D
NOR
3
COMEDK 2021
MCQ (Single Correct Answer)
+1
-0

What is the minimum band-gap of the LED diode?

A
1.5 eV
B
1.7 eV
C
1.8 eV
D
0.8 eV
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

When a $$p$$-$$n$$ junction diode is connected in forward bias, its barrier potential

A
decreases and less current flows in the circuit
B
decreases and more current flows in the circuit
C
increases and more current flows in the circuit
D
decreases and no current flows in the circuit
COMEDK Subjects