List of top Physics Questions asked in COMEDK UGET

In the diagram shown below, $ m_1 $ and $ m_2 $ are the masses of two particles and $ x_1 $ and $ x_2 $ are their respective distances from the origin $ O $. The centre of mass of the system is
A block of wood floats in water with $ \frac{4}{5} $ th of its volume submerged. If the same block just floats in a liquid, the density of the liquid is (in $ \text{kg/m}^3 $)
A balloon with mass $ m $ is descending down with an acceleration $ a $ (where, $ a<g $). How much mass should be removed from it so that it starts moving up with an acceleration $ a' $?
Let $ K_1 $ be the maximum kinetic energy of photoelectrons emitted by light of wavelength $ \lambda_1 $ and $ K_2 $ corresponding to wavelength $ \lambda_2 $. If $ \lambda_1 = 2\lambda_2 $, then
The sides of a parallelogram are represented by vectors $$ \vec{p} = 5\hat{i} - 4\hat{j} + 3\hat{k} \quad \text{and} \quad \vec{q} = 3\hat{i} + 2\hat{j} - \hat{k}. $$ Then, the area of the parallelogram is
A fish in water (refractive index $ n $) looks at a bird vertically above in the air. If $ y $ is the height of the bird and $ z $ is the depth of the fish from the surface, then the distance of the bird as estimated by the fish is
A plane electromagnetic wave of frequency 20 MHz travels through a space along $ z $-direction. If the electric field vector at a certain point in space is 6 V/m, then what is the magnetic field vector at that point?
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

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
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

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

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

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
With what velocity should an observer approach a stationary sound source, so that the apparent frequency of sound should appear double the actual frequency?
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
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
Starting from the center of the Earth having radius $ R $, the variation of $ g $ (acceleration due to gravity) is shown by
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
A thin circular ring of mass $ M $ and radius $ R $ rotates about an axis through its centre and perpendicular to its plane, with a constant angular velocity $ \omega $. Four small spheres each of mass $ m $ (negligible radius) are kept gently to the opposite ends of two mutually perpendicular diameters of the ring. The new angular velocity of the ring will be
One end of the string of length $ l $ is connected to a particle of mass $ m $ and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in a circle with speed $ v $, the net force on the particle (directed towards the center) will be (T represents the tension in the string)
A transistor is connected in CE configuration. The collector supply is 10 V and the voltage drop across a resistor of 1000 $ \Omega $ in the collector circuit is 0.5 V. If the current gain factor is 0.96, then the base current is
The phase difference between displacement and velocity of a particle in simple harmonic motion is