List of top Physics Questions asked in COMEDK UGET

With what minimum acceleration can a fireman slide down a rope while breaking strength of the rope is \( \frac{2}{3} \) of the weight?
Water is poured in a tank through a cylindrical tube of area of cross-section \( A \) and ejecting water at a constant speed 4 m/s. The tank contains a hole of area \( \frac{A}{2} \) at the bottom. The level of water in the tank will not go up beyond
In which mode of transmission, the heat waves travel along straight line with the speed of light?
Consider a compound slab consisting of two different materials having equal lengths, thickness and thermal conductivities \( K \) and \( 2K \) respectively. The equivalent thermal conductivity of the slab is
There are two identical containers \(C_1\) and \(C_2\) containing identical gases. Gas in \(C_1\) is reduced to half of its original volume adiabatically, while the gas in container \(C_2\) is also reduced to half of its initial volume isothermally. Find the ratio of final pressure in these containers. \(\gamma\) be the adiabatic constant)
If \(K_1\) and \(K_2\) are maximum kinetic energies of photoelectrons emitted when lights of wavelengths \(\lambda_1\) and \(\lambda_2\), respectively incident on a metallic surface and \(\lambda_1 = 3\lambda_2\), then
A bullet of mass \( m \) hits a mass \( M \) and gets embedded in it. If the block rises to a height \( h \) as a result of this collision, the velocity of the bullet before collision is
From a circular disc of radius \( R \), a square is cut out with a radius as its diagonal. The centre of mass of the remaining portion is at a distance (from the centre)
A DC ammeter and a hot wire ammeter are connected to a circuit in series. When a direct current is passed through the circuit, the DC ammeter shows 6A. When AC current flows through the circuit, what is the average reading in DC ammeter and the AC ammeter, if DC and AC currents flow simultaneously through the circuit?
An electric current \( I \) enters and leaves a uniform circular wire of radius \( r \) through diametrically opposite points. A charged particle \( q \) moves along the axis of the circular wire and passes through its center with speed \( v \). The magnetic force on the particle when it passes through the center has a magnitude
A particle of mass \( m \) is moving in a horizontal circle of radius \( r \) under a centripetal force given by \( \left( \frac{-K}{r^2} \right) \), where \( K \) is a constant. Then
A bar magnet of length 6 cm is placed in the magnetic meridian with N pole, pointing towards the geographical north. Two neutral points, separated by a distance of 8 cm are obtained on the equatorial axis of the magnet. If \( B_H = 1.2 \times 10^{-5} \, \text{T} \), then the pole strength of the magnet is
A circular coil of 20 turns and radius 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in the coil is 5 A, then the average force on each electron in the coil due to the magnetic field is
Two charged spheres of \( -20\, \mu\text{C} \) and \( 60\, \mu\text{C} \) are kept at a certain distance. They are touched and kept again at the same distance. What is the ratio of force experienced before and after?
The AC voltage across a resistance can be measured using a
The string of length 2 m is fixed at both ends. If the string vibrates in its fourth normal mode with a frequency of 500 Hz, then the waves would travel on it with a velocity of
Speed of electromagnetic wave in a medium having relative permittivity \( \epsilon_r \) and relative permeability \( \mu_r \) is (speed of light in air, \( c = 3 \times 10^8 \, \text{m/s} \))
An alternating voltage \( V = 200\sin(100t) \) is applied to a series combination of \( R = 30\Omega \) and an inductor of \( 400 \, \text{mH} \). The power factor of the circuit is,
A raft of density 600 g/m\(^3\) and mass 120 kg floats in water. How much weight can be put on the raft to make it just sink?
A cell of emf 2V is connected with a load of resistance 1.5Ω. The power delivered by the cell to the load is maximum, then power transferred to the load is
The average kinetic energy of a molecule in air at room temperature of 20\(^\circ\)C
A galvanometer having a resistance of 4 \( \Omega \) is shunted by a wire of resistance 2 \( \Omega \). If the total current is 1.5 A, the current passing through the shunt is
The resultant of two forces acting at an angle of \( 120^\circ \) is \( 10 \, \text{kg-W} \) and is perpendicular to one of the forces. That force is
Two guns P and Q can fire bullets at speeds 2 km/s and 4 km/s, respectively. From a point on a horizontal ground, they are fired in all possible directions. The ratio of maximum or areas covered by the bullets fired by the two guns, on the ground is
In Young's double slit experiment, the two slits are separated by 0.2 mm and they are 1m from the screen. The wavelength of the light used is 500 nm. The distance between 6th maxima and 10th minima on the screen is closest to