List of top Physics Questions asked in KEAM

A balloon of mass 60 g is moving up with an acceleration of 4 m/s\(^2\). The mass to be added to the balloon to descend it down with the same acceleration is (g = 10 m/s\(^2\)):
If a planet orbits the Sun in an elliptical orbit, the quantities associated with the planet that remain constant are:
The quantity of heat conducted through a metal rod kept at its ends at 100°C and 120°C is 5 J/s. If the ends are kept at 200°C and 220°C, then the quantity of heat conducted in 10 seconds is:
Two gases under the same thermal conditions have the same number of molecules per unit volume. If the respective molecular diameters of the gases are in the ratio 1 : 3, then their respective mean free paths are in the ratio:
If \( E_c \) and \( E_v \) represent the energy of the conduction band and valence band, \( E_D \) represent the donor energy level, and the band gap in a n-type semiconductor, then the true relation among them is:
The equipotential surface is:
The electric field intensity due to an ideal dipole at a distance \( r \) from its center on the axial point is directly proportional to:
In a Carnot engine, the temperature of the sink is 350 K. If the efficiency of the engine is 50%, the temperature of the source should be:
If the position of the particle is \( \mathbf{r} = 3 \hat{i} + 2 t^2 \hat{j} \), then the magnitude of its velocity at \( t = 5 \) second in \( {ms}^{-1} \) is:
If a freely falling body covers 80 m in the first 4 seconds, then in the next 4 seconds it covers a distance of:
A proton with kinetic energy of 2 MeV is describing a circular path of radius \( R \) in a uniform magnetic field. The kinetic energy of the deuteron to describe the same circular path in the same field is:
A body of mass \( M \) is at equilibrium under the action of four forces \( F_1, F_2, F_3 \), and \( F_4 \). If \( F_1 \) is removed from the body, then the body moves with an acceleration of:
If an ideal engine needs to transmit a torque of 200 Nm to maintain a rotor at a uniform angular speed of 300 rads\(^{-1}\), then the power required for the engine is:
If an ideal gas, in an insulated vessel, is allowed to expand into another similar evacuated vessel through a valve then:
The total energy of a gas mixture of one mole of oxygen and 3 moles of argon at a temperature \( T \) by neglecting vibrational modes is:
Two spheres A and B having respective charges 6 C and 12 C placed at a distance \( d \) repel each other by a force \( F \). The charge given to sphere A to reverse the force as \( -F \) is:
The de Broglie wavelength associated with the electrons accelerated by a potential of 81 V is lying in the region of electromagnetic waves:
The dimensional formula of the gravitational constant is \( M^a L^b T^c \), the values of \( a \), \( b \), and \( c \) are respectively:
If a charged particle enters a uniform magnetic field \( B \), with a velocity \( v \) such that \( v \) has a component along \( B \), then the charged particle describes:
In an Young double slit experiment without varying the distance of the screen and the slit separation, if the wavelength of monochromatic source is changed one by one in the ratio 2:3:4, then the corresponding fringe widths measured will be in the ratio:
The ratio of the velocities of the electron in the second, third and fourth Bohr’s orbits of the hydrogen atom is:
The mutual inductance between a pair of coils A and B placed close to each other depends upon:
The ratio between the magnetic dipole moment of a revolving electron in a circular orbit to its angular momentum is (where \( e \) is the charge and \( m \) is the mass of the electron):
During the formation of p - n junction:
In an LCR resonance circuit at resonance frequency \( \omega_0 \), the quality factor \( Q \) is: