List of top Physics Questions asked in COMEDK UGET

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 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.
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 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?
The gases carbon monoxide (CO) and nitrogen at the same temperature have kinetic energies $ E_1 $ and $ E_2 $, respectively. Then,

A gas is taken through the cycle $ A \to B \to C \to A $, as shown in the figure. What is the net work done by the gas?

In the figure, pendulum bob on the left side is pulled aside to a height $ h $ from its initial position. After it is released, it collides with the right pendulum bob at rest, which is of the same mass. After the collision, the two bobs stick together and rise to a height

Two wires of the same material having radius in ratio 2 : 1 and lengths in ratio 1 : 2. If the same force is applied on them, then the ratio of their change in length 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
A particle is projected at an angle $30^\circ$ with horizontal having kinetic energy $K$. The kinetic energy of the particle at the highest point is.
The ratio of amplitude of magnetic field to the amplitude of electric field of an electromagnetic wave propagating in vacuum is
A capacitor of capacity 2 $ \mu F $ is charged up to a potential 14 V and then connected in parallel to an uncharged capacitor of capacity 5 $ \mu F $. The final potential difference across each capacitor will be
The mass density of a nucleus varies with mass number $ A $ as
The mean energy per molecule for a diatomic gas is

An air bubble in water ($ \mu = \frac{4}{3} $) is shown in the figure. The apparent depth of the image of the bubble in a plane mirror viewed by the observer is.

A particle is performing simple harmonic motion. Equation of its motion is \( x = 5 \sin \left( 4t - \frac{\pi}{6} \right) \), \( x \) being the displacement from the mean position. Velocity (in ms\(^{-1}\)) of the particle at the instant when its displacement is 3, will be