SAEED MDCAT
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The voltage gain of Op-amplifier is expressed as
When p-n junction diode is forward biased
If R1= 10kΩ and R2 = 100kΩ then gain of inverting amplifier is
In a half wave rectifier, the current through load resistance flows only in
To reduce ripples in the output of bridge rectifier we should use
Open loop gain of operational amplifier is
If signal is applied to input of non-inverting amplifier through resistance of 100 k ohm, and the value of feedback resistance is 10 k ohm, the gain is:
The voltage supplied to input is as in fig. The voltage output is
If R2 = 500 and R1 = 50
then gain of inverting amplifier is
When operational amplifier is used as an inverting amplifier. The potential across non inverting terminal is
The voltage gain of the following amplifier is
The resistance of an ideal diode in reverse bias condition is
If an electron and proton have the same de Broglie wavelength, which particle has greater speed?
Which photon have the maximum momentum
The work function of a metal is 6.63 eV, its threshold frequency is:
If momentum of a particle is doubled then de-Broglie wavelength become
A photo cell shows current I when a bulb is placed at a distance 50 cm from it. What is the current if bulb is placed at a distance 1m from photo cell?
The experimental value of Rydberg constant is
The minimum energy required to remove an electron from metal surface is called
The momentum of the moving photon is:
A photosensitive plate is illuminated by green light and photoelectrons are emitted with maximum kinetic energy . If the intensity of the incident radiation is reduced to one-fourth of the original value, then the maximum K.E. of the photoelectrons will be
In an X-ray tube, when electrons after being accelerated through V volt strike the target then the wavelength of emitted X-rays is
To detect a signal of radio wave__________ of photons are needed.
Which of given is correct Einstein’s photoelectric equation
The momentum of a moving photon is:
The energy of photon of radio waves is only
When light falls on the metal surface, the energies of the emitted electrons vary with
In photoelectric effect when monochromatic light is allowed to shine on cathode, it begins to
A pn junction (D) shown in the figure can act as a rectifier. An alternating current source (V) is connected in the circuit. The output current in the circuit is represented by:
Op-amp consist of dozens of transistor, capacitors and resistors due to this reason is known as
In full wave rectification by bridge the number of diodes required are
For single phase supply frequency of 50 Hz, ripple frequency in full wave rectifier is
In an half wave rectifier, the input sine wave is 250sin100 t. The output ripple frequency of rectifier will be
Which one is reverse-biased?
A semi-conductor can be used as a rectifier because
Which of the following figure represents the variation of particle momentum and the associated de-Broglie wavelength?
The work function of a photoelectric material is 3.3 eV. The threshold frequency will be equal to
The electrons are emitted in the photoelectric effect from a metal surface
When yellow light is incident on a surface, no electrons are emitted while green light can emit. If red light is incident on the surface, then
The work function of aluminium is 4.2 eV. If two photons, each of energy 3.5 eV strike an electron of aluminium, then emission of electrons will be
In photoelectric effect if the intensity of light is doubled then maximum kinetic energy of photoelectrons will become
If the energy of the photon is increased by a factor of 4, then its momentum
Wavelength of a 1 keV photon is 1.24×10-9m. What is the frequency of 1 MeV photon?
The correct curve between the stopping potential (V) and intensity of incident light (I) is
Which light photon has the least momentum:
Which of the following electromagnetic radiations has photons with the greatest energy?
Which of the following electromagnetic radiations has photons with the greatest momentum?
Rest mass of photon of X-rays is
The quanta of energy possessed by -radiation is of the order of
Mathematical operations can be performed electronically by
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