1
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
A Si and a Ge diode has identical physical dimensions. The band gap in Si is larger than that in Ge. On applying identical reverse bias across these diodes,
A
The reverse current in Ge is lesser than that in Si .
B
The relative magnitudes of reverse currents cannot be determined from the given data.
C
The reverse current is identical in both cases.
D
The reverse current in Ge is larger than that in Si .
2
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0
The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than $1.24 \mu \mathrm{~m}$ is incident on it. The band gap (in eV ) for the semiconductor is
A
1 eV
B
1.1 eV
C
2.48 eV
D
0.7 eV
3
COMEDK 2025 Morning Shift
MCQ (Single Correct Answer)
+1
-0

In the energy band diagram of a material shown below, open circles and filled circles denote holes and electrons respectively. The material is a

COMEDK 2025 Morning Shift Physics - Semiconductor Devices and Logic Gates Question 1 English

A
metal
B
insulator
C
n-type semiconductor
D
p-type semiconductor
4
COMEDK 2024 Evening Shift
MCQ (Single Correct Answer)
+1
-0

The conductivity of a semiconductor increases with increase in temperature because

A) number density of free current carriers increases

B) relaxation time increases

C) both number density of carriers and relaxation time increase

D) number density of current carriers increases, relaxation time decreases but effect of decrease in relaxation time is much less than increase in number density

A
C
B
D
C
A
D
B
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