List of top Questions asked in COMEDK UGET

In a potentiometer experiment, two cells of emf $E_1$ and $E_2$ are used in series in the secondary circuit. The balancing length is found to be 58 cm. If the polarity of $E_2$ is reversed, the balancing length becomes 29 cm. The ratio $E_1/E_2$ of the emfs of two cells is :
When the glancing angle of incidence of light on a material is 30$^\circ$, the reflected and refracted light are found to be perpendicular. The refractive index of material is
Two waves having intensity ratio 25 : 4 produce interference. The ratio of maximum to minima intensity is
In diffraction through a single slit experiment, slit width is halved, then
Electromagnetic waves are transverse in nature is evident by
If the gravitational force of earth suddenly disappears, then which of the following is correct?
Among the following find the wrong Statement
Law of gravitation is not applicable if A) Velocity of moving objects are comparable to velocity of light B) Gravitational field between objects whose masses are greater than the mass of sun.
If $G$ is the universal gravitational constant and $p$ is the uniform density of a planet. Then shortest possible period of rotation of the planet can be
The time period of an artificial satellite in a circular orbit is independent of
The time period of a simple pendulum at the centre of the earth is
A relay satellite transmits the television programme from one part of the world to another part continuously because its period
What fraction of the volume of a glass flask must be filled with mercury so that the volume of the empty space may be the same at all temperatures? $\left(\alpha_{\text {glass }}=9 \times 10^{-6} /{ }^{\circ} C , \gamma_{ Hg }=18.9 \times 10^{-5} /{ }^{\circ} C \right)$
If $F_g$ and $F_e$ are gravitational and electrostatic forces between two electrons at a distance 0.1 m then $F_g/F_e$ is in the order of
Average density of the earth
Radio activity decay exist due to
Two equal masses separated by a distance d attract each other with a force (F). If one unit of mass is transferred from one of them to the Other, the force
Which of the following is the evidence to show that there must be a force acting on earth and directed towards Sun?
Intensity of gravitational field inside the hollow spherical shell is
Neutron changing into Proton by emiting electron and anti neutrino this due to
Repulsive force exist between two protons but side the nucleons this due to
Attractive Force is exists between two protons inside the Nucleons this is due to
Out of the following interactions the weakest is
A hollow spherical shell is compressed to half its radius. The gravitational potential at the centre
Force of attraction or repulsion between two current carrying wires separated by a distance r is proportional to