List of top Physics Questions asked in COMEDK UGET

What will be the change in wave length, if a light of wave length 600 nm travels from air enters a medium of refractive index 1.5 and continues its journey through that medium?
Two open organ pipes A and B of length 22 cm and 22.5 cm respectively produce 2 beats per sec when sounded together. The frequency of the shorter pipe is:
In the Young's double slit experiment the fringe width of the interference pattern is found to be \(3.2 \times 10^{-4}\) m, when the light of wavelength 6400 \(\text{Å}\) is use(D) What will be the change in fringe width if the light is replaced with a light of wavelength 4800 \(\text{Å}\)?
A resistor of wire 24 cm length and resistance 8Ω is stretched into a uniform wire of 48 cm length, then the new resistance will be:
A metallic rod of 10 cm is rotated with a frequency 100 revolution per second about an axis perpendicular to its length and passing through its one end in a uniform transverse magnetic field of strength 1 T. The emf developed across its ends is:
The time dependence of a physical quantity \(P\) is given by \[ P = P_0 \exp(-\alpha t^2) \] where \(\alpha\) is a constant and \(t\) is time. The constant \(\alpha\) will:
The magnetic permeability \( \mu \) of a paramagnetic substance is:
A particle at rest decays into two particles of mass \( m_1 \) and \( m_2 \) and move with velocities \( v_1 \) and \( v_2 \). The ratio of their de Broglie wave lengths \( \lambda_1 : \lambda_2 \) is:
A lens of power \( +1 \, \text{D} \) is made in contact with another lens of power \( -2 \, \text{D} \). The combination will then act as:
An uniform sphere of mass \( M \) and radius \( R \) exerts a force of \( F \) on a small mass \( m \) placed at a distance of \( 3R \) from the centre of the sphere. A spherical portion of diameter \( R \) is cut from the sphere as shown in the fig. The force of attraction between the remaining part of the disc and the mass \( m \) is:
220 V ac is more dangerous than 220 V d(C) Why?
The electric flux from a cube of side 1 m is \(\Phi\). When the side of the cube is made 3 m and the charge enclosed by the cube is made one-third of the original value, then the flux from the bigger cube will be:
An electron and a proton having mass \( m_e \) and \( m_p \) respectively, initially at rest, move through the same distance \( s \) in a uniform electric field \( E \). If the time taken by them to cover that distance is \( t_e \) and \( t_p \) respectively, then \( \frac{t_e}{t_p} \) is equal to:
When the angle of incidence on one face of the equilateral glass prism is \(\frac{3}{4}\) of the angle of the prism, the ray of light undergoes minimum deviation. If the velocity of light in vacuum is \(c\), then the velocity of light in the glass is:
If reaction is \(R\) and coefficient of friction is \(\mu\), what is the work done against friction in moving a body by distance \(d\)?
A magnetic field does not interact with:
PQRS is square of side 1 m. A charge of \(100 \, \mu C\) is placed at the centre of the square. Then the work done to take \(3 \, \mu C\) charge from the corner P to the corner R.
A magnetic field does not interact with:
If the ratio of specific heat of a gas at constant pressure to that at constant volume is \( \gamma \), the change in internal energy of a mass of a gas when the volume changes from \( V \) to 3\( V \) at constant pressure is:
A spherical metal ball of density \( \rho \) and radius \( r \) is immersed in a liquid of density \( \sigma \). When an electric field is applied in the upward direction the metal ball remains just suspended in the liqui(D) Then the expression for the charge on the metal ball is:
Two point charges \( 20 \, \mu C \) and \( -10 \, \mu C \) are separated by a distance of 1 m in air. At what point on the line joining the two charges, the electric potential is zero.

In the figure, first the capacitors are fully charged by closing the key K. Then after opening the Key, a dielectric material with dielectric constant \( \kappa = 2 \) is filled in the space between the plates of both the capacitors. At this state the ratio of the charge on the capacitor \(C_1\) to that of \(C_2\) is:

Water from a tap of cross-sectional area \(1 \, \text{cm}^2\), falls vertically downwards at \(2 \, \text{m/s}\). The cross-sectional area of the stream, 20 cm below the tap is (assume that pressure is constant throughout and the flow is streamlined; \(g = 10 \, \text{m/s}^2\)).
The critical angle of a medium having the refractive index \( \sqrt{2} \) is:
The energy gap between valence band and the conduction band for a given material is 6 eV. What would be the energy associated with the second excited state of Li?