1 Crore+ students have signed up on EduRev. Have you? Download the App 
For npn transistor connected as shown in figure V_{BE }= 0.7 volts. Given that reverse saturation current of the .junction at room temperature 300^{0} K is 10^{13} A, the emitter current is
In the bistable circuit shown in the figure, the ideal OP Amp lias saturation levels of ±5 V. The value of R_{1} (in kΩ) that gives a hysteresis width of 500 mV is______
Let the magnitude of the gain in the inverting OpAmp circuit shown be x with switch S_{1 }open. When the switch is closed, the magnitude of gain becomes.
Consider the circuit shown in the figure. Assuming the value of the dc voltage V_{C2} (in volt) is _____.
A Weiii bridge oscillator is shown in figure, which of the following statements are true, if f " is the ffeequency of oscillation?
In a voltage follower opamp circuit, find the closed loop gain V_{0}/V_{s} if the open loop gain = 2
The circuit shown in figure is best described as a
In the shunt regulator shown below, the Vz = 8.2 V and VBE = 0.7 V. The regulated output voltage V_{0} is
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
Suppose one Si and one Gediodes 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(I_{1}) and Ge(I_{2}) are
[Given the cut in voltage of Si diode is 0.7 V and Ge diode is 0.3 V]
In a certain CE amplifier with emitter resistance and emitter bypass capacitor, if the bypass capacitor is removed the voltage gain of the amplifier.
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.
For the Karnaugh map shown in the given figure, the minimum Boolean function is:
If volume and number of particles (F, N) of a thermodynamic system are doubled, which of the following quantities is bound to be doubled?
An ideal bose gas in 5dimensions has the energy dispersion relation ∈ = Ap^{s}. For the Bose gas to undergo BoseEinstein condensation, which of the following should hold?
10 bosons are to be distributed in 3 different energy levels with the 2nd energy level being doubly degenerate and the other two are nondegenerate. The number of ways of achieving this is _____
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
A real gas expands into vacuum in thermally insulated container. Winch of the following properties of the gas will not change?
Consider a system of 5 noninteracting 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 _____ k_{B}. (answer must be given upto 2 decimal places)
Bulk modulus of a substance is defined as where k_{T }is 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)
Water has the anomalous property that it contracts on melting. It means that
Below a certain temperature θ, the molecular specific heat of a certain gas is 5/2 k_{B}. As the temperature is raised above θ , the specific heat becomes 7/2 k_{B. }Which of the following can be the gas in this experiment?
For a 2nd order phase transition, which of the following remains continuous?
In the OpAmp circuit shown, assume that the diode current follows the equation The relationship between
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 Q_{1} shown in the figure is
The output voltage of the regulated power supply shown in figure is
Ill the circuit shown, assume that diodes D_{1 }and D_{2} are ideal. In the steadystate condition, the average voltage V_{ab }( in Volts) across the 0.5 μF capacitor is ______
The figure shows a halfwave rectifier. The diode D is ideal. The average steady state current (in Amperes) through the diode is approximately______
The amplifier circuit shown in the figure is implemented using a compensated operational amplier (OPAmp). and has an openloop voltage gain, and an open  loopcut  off frequency. f_{c }= 8Hz.
The voltage gain of the amplifier at 15 kHz. in V/V, is ______
Consider the circuit shown in the figure Assume basetoemitter voltage V_{BE} = 0.8 V. and common base current gain(α) of the transistor is unity.
The value of the collectorto emitter voltage V_{CE }(in volts) is ________.
For the given circuit, value of the base current ( I_{b} ) of the npn transistor will be _____________ mA. ( β is the current gain and assume OpAmp as ideal).
Transform the following logic circuit (without expressing its switching function) into an equivalent logic circuit that employs only NAND gates each with 2inputs.
The number of NAND gate required to implement _______
Noninteracting bosons trapped in a 3D cubical box of side α (α is very small). For BoseEinstein condensation, the chemical potential must be equal to
Our Sun is projected to be a redgiant star after approximately 5 billion years from now. In the red giant phase, the Light that will be emitted will be mostly infrared around a wavelength of 1μw. The Sun is now at 10000K and emitting mostly around light of 0.5 μm wavelength. From tins information, the surface temperature of the redgiant sun is found to be
Two identical fermions can occupy any of the four energy levels E, 3E, 5E, 7E. The energy' levels 3E and 5E are doubly degenerate whereas the energy' levels E and IE are nondegenerate. Assuming no spin degeneracy; the partition function is
Given a microstate of a system specified by (E, V, N). Which of the following is correct with respect to the given microstate? (The symbols have their usual meaning)
The entropy of a body of fixed volume which radiates a blackbody varies with temperature as:
A system is in contact with a heat both at temperature T and in contact with a particle reservoir as well. The system contains three accessible energy level 0, E and 2E and it may or may not contain one particle at a tune one of the given energy levels. How many accessible states are possible?
The excitations of ferromagnetic are bosonic in nature and are described by a dispersion relation E ∝ k^{2}, where 'E' is the energy and 'k' is the wavevector of die excitation. The average energy of the 3 dimensional ferromagnet vanes with temperature as (assuming die bosonic excitations to be noninteracting)
Given a system of two spins s_{1} and s_{2} each of which can take values +1 and 1. The energy of the system is E =  Js_{1}s_{2}, where J is some positive constant denoting the strength of interaction between the spurs. The minimum energy and the corresponding number of spin configuration are given by
Given a N classical harmonic oscillators in 3dimension such that the total energy of the system is E ≤ E_{0}. The available phase space volume depends on E_{0} as
A box of volume V contains N molecules of an ideal gas. It is in contact with an empty box of volume 2 V through a permeable wall allowing exchange of molecules. If a measurement is made for the number of particles in the empty' box after a long time of contact. What is the standard deviation seen in the measurement?
Two classical particles are distributed on the vertices of a Nsided polygon. Each site can accommodate one particle at a tune. Iftlie adjacent vertices of the polygon are occupied by the particles, the energy of the system increases by E. The mean energy of the system is
Consider a mole of an ideal diatomic gas undergoing a cyclic process as shown in the figure:
The magnitude of the heat released in the cyclic process is_____ P_{0}V_{0}. (answer must be given upto two place after decimal)
1 kg of water at 27^{0}C is mixed with 2 kg of water at 77^{0}C. After thermal equilibrium is reached, the change in
entropy of the system is_____J/K. (Answer must be given upto two place after decimal) (Take specific heat of water to be 4.181 kJ/K)
A classical ideal gas. consisting of N particles (.V → ∝ ) is confined in a box of volume F at a certain temperature T and pressure P. In a part of the box, which has volume V_{0} a measurement is made to count the number of particles present in it. What is the probability that no particle are present inside?
In an experiment to understand why a twolevel system cannot act as a laser, a student heated the gas inside began looking at a spin system with only two energy states μH and μH corresponding to parallel alignment and antiparallel alignment respectively with the magnetic field H. In Ins measurements of ratio of number of spin up to spin down particles as he increased the magnetic field he finds that it never exceeds a number α. What is α? ( answer must be given upto 2 decimal places)
The entropy of a thermodynamic system is given as then, temperature of the system α, E_{0}, are positive constants respectively)
3 noninteracting fermions are confined in a 2D box of area ‘a^{2'}. If the energy' of the 1st excited state of the system is
A particle of mass 2 x l0^{15} kg is constrained to move in twodimensional xy plane. The particle ls in equilibrium with a thermal bath (k_{B}T = 10^{13}J). What is the RMS value of the position (in units of metres) of the particle after a time 10 sec if the particle starts from origin at r = 0 seconds?
(answer must be given in integers)
There is a particle moving in a liquid in 3D following Brownian motion.What is the rootmean squared displacement o f the particle after 5 minutes if the diffusion constant is 10^{2} cm^{2}/s?
A threelevel system at thermal equilibrium at temperature T is governed by the Hamiltonian
The average energy of the system is
1 docs34 tests

GATE Physics Mock Test Series  1 Test  60 ques 
GATE Physics Mock Test Series  2 Test  60 ques 
GATE Physics Mock Test Series  3 Test  60 ques 
GATE Physics Mock Test Series  4 Test  60 ques 
GATE Physics Mock Test Series  5 Test  60 ques 
1 docs34 tests

GATE Physics Mock Test Series  1 Test  60 ques 
GATE Physics Mock Test Series  2 Test  60 ques 
GATE Physics Mock Test Series  3 Test  60 ques 
GATE Physics Mock Test Series  4 Test  60 ques 
GATE Physics Mock Test Series  5 Test  60 ques 