Semiconductor Devices Test

Result

Semiconductor Devices Test - 36

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Weekly Quiz Competition

Question 1
4 / -1

A light emitting diode has a voltage drop of 2V across it when 10mA current is passed. If this LED is to be operated with 6V battery the value of limiting resistor would be_______ .

A
400Ω

B
4000Ω

C
40kΩ

D
300Ω
Question 2
4 / -1

NAND gate is __________ .

A
A basic gate

B
Not a universal gate

C
A universal gate

D
Multipurpose gate
Question 3
4 / -1

The number of holes and electrons in an intrinsic conductors are x and y respectively at room temperature. Which of the following options are true ?

A
x > y

B
y > x

C
x = y

D
x << y
Question 4
4 / -1

How will you increase the resistivity of Ge semi-conductor ?

A
On adding donor impurity

B
On adding acceptor impurity

C
On making UV light incident on Ge crystal

D
On decreasing the temperature
Question 5
4 / -1

From the following semi-conductor devices, __________ operates in forward bias only.

A
Varactar diode

B
Zener diode

C
Light emitting diode

D
Photo-diode
Question 6
4 / -1

___________ device is the odd-one out.

A
Solar-cell

B
Varactor diode

C
Photodiode

D
Zener diode
Question 7
4 / -1

The value of depletion capacitance ___________ on decreasing the reverse bias on varactor diode

A
Decreases

B
Increases

C
Becomes zero

D
Does not change
Question 8
4 / -1

Which of the following statement is correct for transistor LC oscillator circuit ?

A
It works with negative feed back

B
The phase difference between output and input signal is π radian

C
To start oscillation external signal is required

D
The frequency of output signal is independent of the components used in feed back circuit
Question 9
4 / -1

The frequency of output signal of LC oscillator circuit is 100Hz with capacitance value 0.1µF . If value of capacitance is taken as 0.2µF, the frequency of output signal _________.

A

B

C

D

Solution
Question 10
4 / -1

The Common Emmiter amplifier has voltage gain equal to 300 and its input signal is 0.5cos(100 t) volt. The output signal will be equal to

A
150 cos (100t)

B
300 cos (100t)

C
150 cos (100t + π )

D
300 cos (100t – π )

Solution