List of top Physics Questions asked in KEAM

If resistance of a conductor at $20^\circ$C is $10\Omega$, then the resistance at $80^\circ$C is $[\alpha = 4 \times 10^{-3} \ ^\circ\text{c}^{-1}]$
Ripple frequency of a full wave rectifier is
If rms speed is increased 20% and volume is kept constant, then increase in pressure is
Force acting on a particle varies with time \( t \) as \( F = kt \), where \( k \) is a constant. The velocity of the particle after a time \( t \) is
A brass of length 1m is heated throught a temperature rise of $50^\circ$C. Find thermal stress developed in the rod
$(\alpha = 2 \times 10^{-5} \ ^\circ\text{c}^{-1}, Y = 1 \times 10^{11} \text{ N/m}^2)$
Two identical cells having internal resistance $1\Omega$ and emf 6v and 2v are connected in series with external resistance $4\Omega$, find current throught external resistance
Two bodies of same mass having temperature $T_1$ and $T_2$ place kept contact. Specific heat capacity of bodies are s and 1.2s respectively. find equilibrium temperature.
If wavelength of light and separation between slit and screen are fixed. If the slit width is halved, then the angular width become
Energy of radiation incident on a perfect absorbing surface per unit are in unit time is 3.6J. The radiation pressure is:
64 identical spheres each having charge q coalesce to form one big sphere. Find the ratio of the surface charge density of the big sphere to that of small sphere
If temperature is constant and the electric field is doubled then the drift velocity of electrons in a conductor.
An object of mass m is placed in a lift moving upward with acceleration g/2. Find apparant weight.
Displacement of a particle is given by \( x = t^{3/2} + 2 \). Find the time at which velocity becomes zero.
If two objects of mass $m_1 = 80$g and $m_2 = 120$g moves with same speed 6cm/s, find the velocity of centre of mass
Time period of a particle is \( T = k\sqrt{\frac{\rho r^3}{\sigma}} \), where \( k \) is a dimensionless constant, \( \rho \) is density, and \( r \) is radius. The dimension of \( \sigma \) is same as
Two springs with constants k and 2k are connected in series and a mass m is hanged. The time period of oscillation is
An oil drop of charge q and mass m is in equilibrium in an electric field E. The charge of the oil drop is
An $\alpha$ particle and proton are accelerated in cyclotron under idential conditions. Find the ratio of their cyclotron frequncy
A Bar magnet has a magnetic moment M and length l. If its length is reduced to half, find its new magnetic moment.
The graph between displacement and time for a particle moving with uniform acceleration is a ____.
The horizontal range of a projectile is maximum when the angle of projection is ____.
The dimensions for the gravitational constant $G$ are ____.
The slope of the tangent drawn on a position-time graph at any instant is equal to the instantaneous ____.
If the potential at A is zero, potential at B is
The work functions of two metals are 2.75 eV and 2 eV respectively. If these are irradiated by photons of energy 3 eV, the ratio of maximum momenta of the photoelectrons emitted respectively by them is