Physics Test 105

Result

Physics Test 105

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Weekly Quiz Competition

Question 1
4 / -1

The resistivity of a pure semiconductor is 0.5 Ωm. If the electron and hole mobility be 0.39 m²/V-s and 0.19 m²/V-s respectively then calculate the intrinsic carrier concentration.

A
2.16 × 10¹⁹/m³

B
4.32 × 10¹⁹/m³

C
10²⁰/m³

D
None of these

Solution
Question 2
4 / -1

For given electric voltage signal dc value is :-

A
6.28 V

B
3.14 V

C
4 V

D
0 V

Solution
Question 3
4 / -1

In the given circuit what is the maximum value of R_S for zener diode to regulate voltage on load resistance ?

A
2 kΩ

B
5 kΩ

C
6 kΩ

D
4 kΩ

Solution

For maximum value of R_S we consider just break down condition.
Question 4
4 / -1

A PNP transistor is connected in C.E. configuration in a given amplifier. A load resistance of 500 Ω is connected in the collector circuit and the voltage drop across it is 0.5V. If the current amplification factor is (α) 0.98 and input resistance of the circuit 294 Ω. Then the voltage gain and power gain of the amplifier will be respectively :-

A
48, 2400

B
83.3, 4083.3

C
70, 3020

D
24, 100

Solution
Question 5
4 / -1

Equivalent gate of the circuit should be :-

A
OR

B
NOT

C
AND

D
NOR

Solution
Question 6
4 / -1

The mobility of electron and holes in a sample of intrinsic germanium at room temperature are 0.36 and 0.14 m²/V-s. If electron and holes densities each are equal to 2.5 × 10¹⁹/m³, then conductivity of germanium will be (in ohm meter) :-

A
2

B
4

C
6

D
8

Solution

σ = ne(μ_e + μ_H)
Question 7
4 / -1

Find the current through 1 Ω resistance –

A
2 amp

B
1 amp

C
3 amp

D
None of these

Solution
Question 8
4 / -1

In p-n junction photocell electromotive force due to monochromatic light is proportional to

A
p-n potential barrier

B
intensity of light

C
frequency of light

D
p-n applied voltage
Question 9
4 / -1

Current flowing zener diode shown in circuit:- (Given diode is ideal and V_z = 4V)

A
0.4 A

B
0.5 A

C
0.1 A

D
0.9 A

Solution
Question 10
4 / -1

In common base configuration transistor power gain is 800 and voltage gain is 840. If base current is 1.2 mA then collecter current will

A
24 mA

B
12 mA

C
6 mA

D
3 mA

Solution