Test: Combined (Thermo + Electronics) - Physics MCQ

# Test: Combined (Thermo + Electronics) - Physics MCQ

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## 30 Questions MCQ Test GATE Physics Mock Test Series 2025 - Test: Combined (Thermo + Electronics)

Test: Combined (Thermo + Electronics) for Physics 2024 is part of GATE Physics Mock Test Series 2025 preparation. The Test: Combined (Thermo + Electronics) questions and answers have been prepared according to the Physics exam syllabus.The Test: Combined (Thermo + Electronics) MCQs are made for Physics 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Combined (Thermo + Electronics) below.
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Test: Combined (Thermo + Electronics) - Question 1

### For n-p-n transistor connected as shown in figure VBE = 0.7 volts. Given that reverse saturation current of the .junction at room temperature 3000 K is 10-13 A, the emitter current is

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Test: Combined (Thermo + Electronics) - Question 2

### In the bistable circuit shown in the figure, the ideal OP- Amp lias saturation levels of ±5 V. The value of R1 (in kΩ) that gives a hysteresis width of 500 mV is______

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Test: Combined (Thermo + Electronics) - Question 3

### The circuit shown in the figure is

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Test: Combined (Thermo + Electronics) - Question 4

Let the magnitude of the gain in the inverting Op-Amp circuit shown be x with switch Sopen. When the switch is closed, the magnitude of gain becomes.

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Test: Combined (Thermo + Electronics) - Question 5

Consider the circuit shown in the figure. Assuming  the value of the dc voltage VC2 (in volt) is _____.

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Test: Combined (Thermo + Electronics) - Question 6

A Weiii bridge oscillator is shown in figure, which of the following statements are true, if f " is the ffeequency of oscillation?

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Test: Combined (Thermo + Electronics) - Question 7

In a voltage follower op-amp circuit, find the closed loop gain V0/Vs if the open loop gain = 2

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Test: Combined (Thermo + Electronics) - Question 8

The circuit shown in figure is best described as a

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CKT is voltage doubles circuit
⇒ Once capacitor charge it can't discarge

Test: Combined (Thermo + Electronics) - Question 9

In the shunt regulator shown below, the Vz = 8.2 V and VBE = 0.7 V. The regulated output voltage V0 is

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KVL

Test: Combined (Thermo + Electronics) - Question 10

Let  denote the Exclusive OR (XOR) operation, Let '1' and '0' denote the binary constants. Consider the following Boolean expression for F over two variables P and Q:

The equivalent expression for F is

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Test: Combined (Thermo + Electronics) - Question 11

Suppose one Si and one Ge-diodes are connected in parallel and then this combination is connected to a power supply of 5 V together with a series resistance 220 Ω. The value of the current through the Si(I1) and Ge(I2) are
[Given the cut in voltage of Si diode is 0.7 V and Ge diode is 0.3 V]

Detailed Solution for Test: Combined (Thermo + Electronics) - Question 11

Since the cut in voltage of Ge-diode is less than the cut in voltage of Si diode, so first Ge-diode will be on and all current will pass through it and Si diode will never on.

Test: Combined (Thermo + Electronics) - Question 12

In a certain CE amplifier with emitter resistance and emitter by-pass capacitor, if the by-pass capacitor is removed the voltage gain of the amplifier.

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The re model of CE transistor.

Therefore, gain will decrease if we remove capacitor.

Test: Combined (Thermo + Electronics) - Question 13

In the given circuit the time constant is larger than the period of the signal and the zener breakdown voltage of zener diode is 6V. A square wave is applied to the input as shown in figure. Which of the following graph represent the nature of the output.

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During positive half cycle diocle will be conducting so output will be zero and capacitor will changed at -10V. During negative half cycle effective input will -20 V. and diode will be reverse biased and input voltage is less than Vth, so zener diode will be behave like voltage regulator. So output will be -6V.

Test: Combined (Thermo + Electronics) - Question 14

For the Karnaugh map shown in the given figure, the minimum Boolean function is:

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Test: Combined (Thermo + Electronics) - Question 15

The given circuit will behave like

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Test: Combined (Thermo + Electronics) - Question 16

If volume and number of particles (F, N) of a thermodynamic system are doubled, which of the following quantities is bound to be doubled?

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Pressure (P), Temperature (T) and Chemical potential (//) are intensive variables whereas entropy (S) is an extensive variable. On increasing the size of a system, extensive variables are bound to increase proportionally whereas intensive variables are not bound to change just because the size of the system has increased.

Test: Combined (Thermo + Electronics) - Question 17

An ideal bose gas in 5-dimensions has the energy dispersion relation ∈ = Aps. For the Bose gas to undergo Bose-Einstein condensation, which of the following should hold?

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For Bose-Einstein condensation o f an ideal bose gas is d-dimensions with dispersion relation (S > 0 because increasing momentum should not decrease energy), we have

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Test: Combined (Thermo + Electronics) - Question 18

10 bosons are to be distributed in 3 different energy levels with the 2nd energy level being doubly degenerate and the other two are non-degenerate. The number of ways of achieving this is _____

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3 energy levels with one of them being doubly degenerate effectively means 4 energy levels.
∴ Number of ways of distributing 10 bosons in 4 energy levels

Test: Combined (Thermo + Electronics) - Question 19

For a gas confined in a box of volume V having total energy E and N number of particles, the number of microstates is  Then the equation of state is

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Test: Combined (Thermo + Electronics) - Question 20

A real gas expands into vacuum in thermally insulated container. Winch of the following properties of the gas will not change?

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The given case is of adiabatic free expansion. For this, the internal energy of all the gases remains conserved. Moreover, the expression of internal energy of a real gas is given by

∴

Since, dV > 0, we have dT < 0. So, the temperature of the real gas will decrease.

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Test: Combined (Thermo + Electronics) - Question 21

Consider a system of 5 non-interacting distinguishable particles. Each particle can occupy only two energy levels ∈ and 2∈. If the total energy of the system 8∈. Then, the entropy of the system is _____ kB. (answer must be given upto 2 decimal places)

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Let N1 and N2 be the number of particles occupying energy levels ∈ and 2∈ respectively.

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Test: Combined (Thermo + Electronics) - Question 22

Bulk modulus of a substance is defined as where kis tlie isothermal compressibility. If instead kT of 1 mole of an ideal gas, we take 5 moles of the same gas, then the ratio of bulk modulus to pressure B:P =_____. (Correct answer must be given upto two place decimal)

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For ideal gas, we have

Test: Combined (Thermo + Electronics) - Question 23

Water has the anomalous property that it contracts on melting. It means that

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By Clausius - Clapeyron equation

where L = Latent heat of fusion, V2 = Volume of water and V1 = Volume of ice

It means that with increase in pressure, there is decrease in temperature.
Hence, melting point decreases with increase of pressure.

Test: Combined (Thermo + Electronics) - Question 24

Below a certain temperature θ, the molecular specific heat of a certain gas is 5/2 kBAs the temperature is raised above θ , the specific heat becomes 7/2 kB. Which of the following can be the gas in this experiment?

Detailed Solution for Test: Combined (Thermo + Electronics) - Question 24

The specific heat of a diatomic molecule looks like

This jump of Cfrom  comes from vibrational degrees of freedom.
Hence, the gas to be nitrogen.

Test: Combined (Thermo + Electronics) - Question 25

For a 2nd order phase transition, which of the following remains continuous?

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For a 2nd order phase transition, the quantities which involves second order derivative of free energy are discontinuous whereas the quantities which involves first order derivative of free energy are continuous .Now, we have

As   are 2nd order derivatives of free energy A, they are discontinuous. Moreover, entropy is continuous across 2nd order phase transition.

Test: Combined (Thermo + Electronics) - Question 26

In the Op-Amp circuit shown, assume that the diode current follows the equation   The relationship between

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Logarithmic Amplifies
Case-1

Test: Combined (Thermo + Electronics) - Question 27

A regulated power supply, shown in figure below, lias an unregulated input (UR) of 15 volts and generates a regulated ouput. Use the component values shown in the figure.

The power dissipation across the transistor Q1 shown in the figure is

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Test: Combined (Thermo + Electronics) - Question 28

The output voltage of the regulated power supply shown in figure is

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Test: Combined (Thermo + Electronics) - Question 29

Ill the circuit shown, assume that diodes Dand D2 are ideal. In the steady-state condition, the average voltage Vab ( in Volts) across the 0.5 μF capacitor is ______

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Test: Combined (Thermo + Electronics) - Question 30

The figure shows a half-wave rectifier. The diode D is ideal. The average steady state current (in Amperes) through the diode is approximately______

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Positive peak detector circuit

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