1
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

$$ \text { In a p-n junction, the depletion layer of thickness } 1 \mu \mathrm{m} \text { has } 0.05 \mathrm{~V} \text { potential across it. The electric field in } N C^{-1} \text { is } $$

A
$$ 5 \times 10^{-8} $$
B
$$ 5 \times 10^{2} $$
C
$$ 5 \times 10^{5} $$
D
$$ 5 \times 10^{4} $$
2
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

The mobility of the charge carriers increases with

A
The average collision time
B
Increase in the mass of the charge
C
Increase in the electric field
D
Decrease in the charge of the mobile carriers
3
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

In intrinsic semiconductors at room temperature, number of electrons and holes are

A
zero
B
infinity
C
unequal
D
equal
4
COMEDK 2024 Afternoon Shift
MCQ (Single Correct Answer)
+1
-0

A semiconductor $$\mathrm{X}$$ is made by doping silicon with phosphorous. A second semiconductor $$\mathrm{Y}$$ is made by doping silicon with aluminium. The two are joined by a suitable technique to form a $$\mathrm{p}$$-$$\mathrm{n}$$ junction and is connected to a battery such that $$\mathrm{Y}$$ is joined to negative of the battery and $$\mathrm{X}$$ to the positive of the battery. Which of the following statements is correct?

A
Potential barrier of the junction is zero and current is due to minority carriers
B
Potential barrier of the junction is raised and current is due to majority carriers
C
Potential barrier of the junction is raised and current is due to minority carriers
D
Potential barrier of the junction is lowered and current is due to minority carriers
COMEDK Subjects
EXAM MAP