Semiconductor Devices Test

Result

Semiconductor Devices Test - 55

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Weekly Quiz Competition

Question 1
4 / -1

Which is the wrong statement in following sentences?
A device in which P and N-type semiconductors are used is more useful than a vacuum type bacause

A
Power is not necessary to heat the filament

B
It is more stable

C
Very less heat is produced in it

D
Its efficiency is high due to a high voltage across the junction
Question 2
4 / -1

In the diagram, the input is across the terminals A and C and the output is across the terminals B and D, then the output is

A
Zero

B
Same as input

C
Full wave rectifier

D
Half wave rectifier
Question 3
4 / -1

The current through an ideal PN junction shown in the following circuit diagram will be

A
Zero

B
1 mA

C
10 mA

D
30 mA
Question 4
4 / -1

In a full wave rectifiers, input AC current has a frequency ‘v’. The output frequency of current is

A
v/2

B
v

C
2v

D
None of these
Question 5
4 / -1

A diode having potential difference 0.5 V across its junction which does not depend on current, is connected in series with resistance of 20 Ω across source. If 0.1 A passes through resistance, then what is the voltage of the source?

A
1.5 V

B
2.0 V

C
2.5 V

D
5 V

Solution
Question 6
4 / -1

In a reverse biased diode when the applied voltage changes by 1 V, the current is found to change by 0.5 µA. The reverse bias resistance of the diode is

A
2 × 10⁵ Ω

B
2 × 10⁶ Ω

C
200 Ω

D
2 Ω

Solution
Question 7
4 / -1

Suppose an unregulated D.C. input voltage V_I is applied to a Zener diode having breakdown voltage (V_Z). Then, the breakdown condition for the diode to work as voltage regulator is

A
V_I < V_Z

B
V_I = V_Z

C
V_I > V_Z

D
Question 8
4 / -1

The energy of radiation emitted by LED is

A
Greater than the band gap of the semiconductor used

B
Always less than the band gap of the semiconductor used

C
Always equal to the band gap of the semiconductor used

D
Equal to or less than the band gap of the semiconductor used

Solution
Question 9
4 / -1

Currents flowing in each of the circuits A and B respectively

A
1A, 2 A

B
2 A, 1 A

C
4A, 2 A

D
2 A, 4 A

Solution
Question 10
4 / -1

An alternating current can be converted into direct current by a

A
Dynamo

B
Motor

C
Transformer

D
Rectifier