List of top Physics Questions asked in COMEDK UGET

A monochromatic light of wavelength \( 6000 \, \mathring{A} \) is passed through two media A and B of thickness 10 cm and 16 cm respectively. The number of waves in A is \( \frac{1}{2} \) that of B. If the refractive index of A is \( \frac{4}{3} \), find the refractive index of B.
Two wires A and B made of same material having length 10 cm and 40 cm respectively are connected in parallel to the same source of emf 10 V. What will be the ratio of the drift velocity of the electrons in the wire A to the drift velocity in the wire B?
What should be the value of the inductance of the coil which is to be connected to \( 220 \, V, 50 \, Hz \) supply so that maximum current of \( 3\sqrt{2} \, A \) flows through the circuit?
In the Young's double slit experiment, when a monochromatic light is used, fringe width obtained is 1 mm. If the wavelength is halved and the slit width is doubled, what will be the new fringe width?
When a metallic spherical shell of radius 20 cm is charged, the potential on its surface is found to be 5 V. The potential at a point 10 cm from the centre of the spherical shell is:
What is the maximum wavelength of EM radiation required to move an electron from the valence band to conduction band of a semiconductor? [Given: Energy gap \( E_g = 1.98 \times 10^{-19} \, J \); Planck's constant \( h = 6.6 \times 10^{-34} \, Js \)]
In the expression \( P = E l^2 m^{-5} G^{-2} \) where \( E, l, m \) and \( G \) represent Energy, Angular Momentum, Mass and Gravitational Constant, the dimensions of \( P \) are
An EM wave of frequency \( 5 \times 10^9 \, Hz \) falls normally on a rectangular slit of width \( 3 \, cm \). What is the total angular width of the central maxima?
The separation between C and O atoms in CO is \( 0.12 \, nm \). The distance of C atom from the centre of mass is
Across the \( 220 \, V \) source of internal resistance \( 20\Omega \), how many lamps of \( 40 \, W, 100 \, V \) can be connected in parallel so that all the lamps may glow with full brightness.
An open pipe is in second harmonic with frequency \( f_1 \). One end of the tube is closed and frequency is increased to \( f_2 \) and it resonates again with nth harmonic. For what value of \( n \), the ratio of \( \frac{f_1}{f_2} \) is \( \frac{4}{5} \)?
The focal lengths of the objective and eyepiece of a compound microscope are \( 1 \, \text{cm} \) and \( 10 \, \text{cm} \) respectively. Length of the tube is \( 25 \, \text{cm} \). If the final image is formed at infinity, the magnifying power of the microscope is:
If the radius of earth were to shrink by two percent, its mass remaining the same, the acceleration due to gravity on the earth's surface would
A body weighing 125 kg just slides down a rough inclined plane that rises 1 m in every 2 m. What is the coefficient of friction?
The resistance of the conductor is \( \sqrt{3}\Omega \) the angle made by the V-I graph with the voltage axis is \( \theta \)
When a dielectric slab of dielectric constant \( k = 2 \) is used to fill the space between the plates of a parallel plate capacitor, the capacitance of the capacitor is found to be \( 20 \mu F \). What will be the capacitance when the slab is replaced with air?
In which of the following circuit do we find the current and voltage in phase?
A ray of light is travelling from glass of refractive index \( \frac{3}{2} \) to water of refractive index \( \frac{4}{3} \). What is the minimum angle of incidence for which no light enters into the water?
A galvanometer of \( 50\Omega \) resistance is converted into an ammeter using a shunt resistance of \( 10\Omega \). If the same resistance is used to convert the same galvanometer into a voltmeter, what would be the ratio of the resistance of the ammeter to the resistance of the voltmeter?
Diamond is considered as an insulator because
An ideal gas is expanding such that \( PT^2 = \text{constant} \). The coefficient of volume expansion of the gas is
A gun is used to fire a bullet at an angle of \( 30^\circ \) and at \( 60^\circ \) respectively. The ratios of heights and ranges reached by the bullet are
A monoatomic ideal gas, initially at temperature \( T_1 \), is enclosed in a cylinder fitted with a frictionless piston. The gas is allowed to expand adiabatically to a temperature \( T_2 \) by releasing the piston suddenly. If \( L \) and \( 2L \) are the lengths of the gas column before and after expansion respectively, then \( \frac{T_1}{T_2} \) is
The nucleus of oxygen atom contains 8 protons and 8 neutrons. What is the mass defect in amu? [Given Mass of proton = 1.00727 amu Mass of neutron = 1.00866 amu and the mass of oxygen nucleus = 15.99053 amu.]
The square of resultant of two equal electric field vectors is three times their product. Angle between them is