List of top Physics Questions asked in COMEDK UGET

When a certain metal surface is illuminated with light of frequency $ \nu $, the stopping potential for photoelectric current is $ V_0 $. When the same surface is illuminated by light of frequency $ \frac{\nu}{2} $, the stopping potential is $ \frac{V_0}{4} $. The threshold frequency for photoelectric emission is
A body is projected vertically upwards. The times corresponding to height $ h $ while ascending and while descending are $ t_1 $ and $ t_2 $, respectively. Then, the velocity of projection will be (take $ g $ as acceleration due to gravity)
An LED is constructed from a p-n junction diode using GaAsP. The energy gap is 1.9 eV. The wavelength of the light emitted will be equal to

Which logic gate is represented by the following combination of logic gates?

If $ C $ be the capacitance and $ V $ be the electric potential, then the dimensional formula of $ CV^2 $ is
The height vertically above the Earth's surface at which the acceleration due to gravity becomes 1 percent of its value at the surface is
In the case of an inductor,
In Young's double slit experiment, the ratio of maximum and minimum intensities in the fringe system is 9:1. The ratio of amplitudes of coherent sources is
The first emission of hydrogen atomic spectrum in Lyman series appears at a wavelength of

In the figure below, the capacitance of each capacitor is $ 3 \mu F $. The effective capacitance between A and B is

If 150 J of heat is added to a system and the work done by the system is 110 J, then the change in internal energy will be
The wavelength of the first line of Lyman series for H-atom is equal to that of the second line of Balmer series for a H-like ion. The atomic number $ Z $ of H-like ion is
In Young's double slit interference experiment, using two coherent waves of different amplitudes, the intensity ratio between bright and dark fringes is 3. Then, the value of the ratio of the amplitudes of the waves that arrive there is

In the series L-C-R circuit shown, the impedance is

An ideal gas goes from state A to state B via three different processes as indicated in the p-V diagram. $ Q_1 $, $ Q_2 $, and $ Q_3 $ indicate the heat absorbed by the three processes and $ \Delta U_1 $, $ \Delta U_2 $, and $ \Delta U_3 $ indicate the change in internal energy along the three processes respectively, then

If escape velocity on Earth surface is 11.1 km/h$^{-1}$, then find the escape velocity on the Moon surface. If the mass of the Moon is $ \frac{1}{81} $ times the mass of the Earth and the radius of the Moon is $ \frac{1}{4} $ times the radius of Earth.
A car is moving towards a high cliff. The car driver sounds a horn of frequency $ f $. The reflected sound heard by the driver has a frequency $ 2f $. If $ v $ be the velocity of sound, then the velocity of the car in the same velocity units will be
The instantaneous values of alternating current and voltages in a circuit given as
$$ i = \frac{1}{\sqrt{2}} \sin(100\pi t) \text{ amp} $$ $$ e = \frac{1}{\sqrt{2}} \sin(100\pi t + \pi/3) \text{ volt} $$ The average power (in watts) consumed in the circuit is
The magnetic flux linked with a coil satisfies the relation $ \phi = (4t^2 + 6t + 9) \, \text{Wb} $, where $ t $ is time in seconds. The emf induced in the coil at $ t = 2 $ seconds is
Two very long straight parallel wires carry currents $ i $ and $ 2i $ in opposite directions. The distance between the wires is $ r $. At a certain instant of time a point charge $ q $ is at a point equidistant from the two wires in the plane of the wires. Its instantaneous velocity $ v $ is perpendicular to this plane. The magnitude of the force due to the magnetic field acting on the charge at this instant is
A dielectric of dielectric constant $ K $ is introduced such that half of its area of a capacitor of capacitance $ C $ is occupied by it. The new capacity is
With what velocity should an observer approach a stationary sound source, so that the apparent frequency of sound should appear double the actual frequency?
A long spring, when stretched by a distance $ z $, has potential energy $ U $. On increasing the stretching to $ n $ times, the potential energy of the spring will be
Starting from the center of the Earth having radius $ R $, the variation of $ g $ (acceleration due to gravity) is shown by
Two wires are made of the same material and have the same volume. The first wire has cross-sectional area $ A $ and the second wire has cross-sectional area $ 3A $. If the length of the first wire is increased by $ \Delta l $ on applying a force $ F $, how much force is needed to stretch the second wire by the same amount?