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Physics Exam  >  Physics Tests  >  IIT JAM Physics Mock Test - 9 - Physics MCQ

IIT JAM Physics Mock Test - 9 - Physics MCQ


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30 Questions MCQ Test - IIT JAM Physics Mock Test - 9

IIT JAM Physics Mock Test - 9 for Physics 2024 is part of Physics preparation. The IIT JAM Physics Mock Test - 9 questions and answers have been prepared according to the Physics exam syllabus.The IIT JAM Physics Mock Test - 9 MCQs are made for Physics 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for IIT JAM Physics Mock Test - 9 below.
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IIT JAM Physics Mock Test - 9 - Question 1
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In a common emitter amplifier, the unbypassed emitter resistance provide:-

Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 1

There are two circuits with emitter resistance unbypassed. In CE amplifier the output is taken from collector. Here, the feedback is current series.

IIT JAM Physics Mock Test - 9 - Question 2
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In the following given circuit, calculate the value of "Vce" if the transistor is working in cut off:-

Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 2

As the transistor is working in cut off region.

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IIT JAM Physics Mock Test - 9 - Question 3
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A change in the value of the emitter resistance (Re), in a differential amplifier:-

Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 3

(Emitter resistance only affects the common mode output & thus the common mode gain)

IIT JAM Physics Mock Test - 9 - Question 4
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The ripple factor of a power supply is given by (symbols have the usual meaning)
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 4

The magnitude of the ripple is given by the ratio of the root mean square value of the ac component to the mean value of the total & is usually expressed as a percentage. This is known as ripple factor.

IIT JAM Physics Mock Test - 9 - Question 5
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A diode has a reverse saturation current Is = 10-10 A & non-ideality factor η = 2. If diode voltage is 0.9 V then diode current is:-
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IIT JAM Physics Mock Test - 9 - Question 6
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An op-amp has a slow-rate 5V/μs. The largest sinwave output voltage possible at a frequency of 1MHz is:-
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IIT JAM Physics Mock Test - 9 - Question 7
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The form factor (in case of resistive load) for a full wave rectifier is:-
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IIT JAM Physics Mock Test - 9 - Question 8
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The static characteristic of an adequately forward biased p-n junction is a straight line, if the plot is of:
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 8

Static characteristic of a forward biased p-n junction :-

Thus straight line is : log I v/s V

IIT JAM Physics Mock Test - 9 - Question 9
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The ideal characteristic of a stabilizer is:-
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 9

Voltage stabilizer is a zener diode or other device that suppresses variation in a DC voltage. It is often used in place of capacitor, across a cathode biasing resistor.

IIT JAM Physics Mock Test - 9 - Question 10
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Silicon diode is less suited for low voltage rectifier operation, because:-
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 10

Solicon diode is less suited for low voltage rectifier operation because its break down voltage is high

IIT JAM Physics Mock Test - 9 - Question 11
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The breakdown voltage of a transistor with its base open is BVCEO & that with emitter open is BVCBO, then
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Become the emitter is most heavily doped region in the transistor. It is about 40 to 50% BVCBO

IIT JAM Physics Mock Test - 9 - Question 12
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In a bipolar transistor at room temperature, if the emitter current is doubled the voltage across its base emitter junction will
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 12

In a BJT emitter current is doubled and one has to find the base emitter voltage, so we consider the p – n junction formed by emitter and base. The junction current is given by

 

IIT JAM Physics Mock Test - 9 - Question 13
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What is the current through 100Ω resistance is the circuit shown below?
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 13

The current will not pass through Z2

Hence, 6 = I(150+100)
6 = 250 I

= 0.024 A

IIT JAM Physics Mock Test - 9 - Question 14
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Which of the following statements if not true regarding the magnitude of barrier potential of a p-n junction.
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 14

When a p-type semiconductor having holes as majority carrier is clamped with a n-type semiconductor having electron as 


Majority carrier some electrons from n side goes to p side and some holes goes to p side and some holes goes to n side, thus created a potential barrier, which 
(i) Depends on temperature
(ii) Depends on Fermi level
(iii) Forbidden energy gap Eg
(iv) Majority carriers.

IIT JAM Physics Mock Test - 9 - Question 15
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If in a p-n junction diode, a square input signal of 6V is applied see figure be-low, what is the value of the output signal across 'RL'?
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 15




Thus output curve will be:- 

IIT JAM Physics Mock Test - 9 - Question 16
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The circuit shown below has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit?
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IIT JAM Physics Mock Test - 9 - Question 17
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The input signal given to a CE amplifier having a voltage gain of 150 is V1 = 2cos(15t+100). The corresponding output signal is:
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The voltage gain is defined as:
12

IIT JAM Physics Mock Test - 9 - Question 18
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In the following circuit, the voltage across & the current through the 2kΩ resistance are: 
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 18

Zener diode acts a DC voltage stabilizer. Hence the voltage developed across 

IIT JAM Physics Mock Test - 9 - Question 19
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In the following circuit Tr1 & Tr2 are identical transistors having VBE = 0.7V. The current passing through the transistor Tr2 is :
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 19

Applying KVL, we get

IIT JAM Physics Mock Test - 9 - Question 20
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A bipolar junction transistors with one junction forward biased & either the collector or emitter open, operated in the :
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 20

When one junction is forward biased either collector or emitter open, operates in pinch-off region.

IIT JAM Physics Mock Test - 9 - Question 21
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A  silicon diode is in series with a 1.0 kΩ resistor and a 5V battery. If the anode is connected to the positive battery terminal, the cathode voltage with respect to the negative battery terminal is:
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 21

The cathode voltage with respect to the negative battery terminal is VBias-VF for silicon VF = 0.7 V, VBias = 5V

IIT JAM Physics Mock Test - 9 - Question 22
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Which one of the following statement is true for a semiconductor p-n junction with no external bias?
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 22

In case of SC p-n junction with no external bias: the structure looks like


IIT JAM Physics Mock Test - 9 - Question 23
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An intrinsic semiconducting sample has an energy gap of 0.38eV, calculate the probability at 1000C that the lowest level in the conduction band will be occupied.
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IIT JAM Physics Mock Test - 9 - Question 24
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Which of the following output curves correctly  represent the output of the given clamper circuit:-
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 24

The correct answer is option B.

IIT JAM Physics Mock Test - 9 - Question 25
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Which relation is correct for intrinsic semiconductor?
(where  conducting of material μn and μp is the electron mobility and hole mobility respectively.
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 25

The correct relation is given by,

σ=z exp(-Eg/2KBT)e(μn+μp)

and, nc=2(2πm,eKBT/h2)3/2 exp[(Ef-Ec)/KBT]

The correct answer is option C.

IIT JAM Physics Mock Test - 9 - Question 26
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If the transistor of an amplifier is changed & the gain is increased by two times, which of the following Parameters will have the higher increase in its value :-
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IIT JAM Physics Mock Test - 9 - Question 27
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Mobility of free electrons depends on temperature variation in case of a semiconductor as:-
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IIT JAM Physics Mock Test - 9 - Question 28
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The graph of   where P → Resistinity & 'T' is the temperature :-
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IIT JAM Physics Mock Test - 9 - Question 29
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In a germanium semiconductor material used in transistors, mobility of electrons is 3900 cm2N. How much velocity do they have?
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 29

The ration of drift velocity to the applied electric field is known as mobility of the charge.

IIT JAM Physics Mock Test - 9 - Question 30
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A CE amplifier has voltage gain of 50, an input impedance of 1000Ω and an output impedance of 200Ω. The power gain of the amplifier will be :
Detailed Solution for IIT JAM Physics Mock Test - 9 - Question 30

The power gain is defined as ratio of output power to the input power and is given power gain = Voltage gain x current gain = 

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