List of top Physics Questions asked in KEAM

The distance between two charges \( q_1 = +2 \, \mu C \) and \( q_2 = +8 \, \mu C \) is 15 cm. Calculate the distance from the charge \( q_1 \) to the points on the line segment joining the two charges where the electric field is zero.
Which of the following statement is incorrect about Bohr's model of atom?
Two masses connected in series with two massless strings are hanging from a support as shown in the figure. Find the tension in the upper string.
The magnetic force acting on a charged particle carrying a charge of \( 3 \, \mu C \) in a magnetic field of 5 T acting in the \( y \)-direction, when the particle velocity is \( ( \hat{i} + \hat{j} ) \times 10^5 \, \text{ms}^{-1} \), is:
A galvanometer of resistance 100 \(\Omega\) gives a full scale deflection for a current of 1 mA through it. The resistance required to convert it into a voltmeter which can read up to 2 V is:
Three point charges \(4q\), \(Q\), and \(q\) are placed in a straight line of length \(L\) at points 0, \(L/2\), and \(L\) respectively. The net force on charge \(q\) is zero. The value of \(Q\) is:
The electric field inside a uniformly charged spherical shell of radius \( R \) is:
The donor level in an n-type semiconductor lies ________.
In a Germanium crystal containing N atoms, the total number of outer electrons is ________.
If a radioactive element disintegrates for its mean life, the fraction of original amount remaining is ________.
In the nuclear reaction $\begin{smallmatrix}197\\ 80\end{smallmatrix}X \rightarrow \begin{smallmatrix}197\\ 79\end{smallmatrix}Y + Z + v$, the particle Z is ________.
The ratio of the respective de Broglie wavelengths of two particles with kinetic energy of 0.02 eV and 2 eV is ________.
The plot of maximum kinetic energy of photo-electrons vs the energy of incident photons above threshold frequency is ________.
In Huygens construction, the secondary wavelets move ________.
The phenomenon of diffraction is most significant when the slit width is ________.
When a beam of white light enters into an optical prism, the most deviated colour is ________.
The speed of electromagnetic waves in a medium depends on the ________.
A metal rod of length 0.5 m moves at $3~ms^{-1}$ perpendicular to a magnetic field of 0.2 T. The induced emf is ________.
The resistance of a semiconductor ________.
A galvanometer is converted into a voltmeter by connecting ________.
The magnetic dipole moment of a current loop carrying current $I$ and of area $A$ with $n$ turns is ________.
The line integral of the magnetic field around a closed loop is directly proportional to the ________.
If $n$ identical cells each of emf $E$ and internal resistance $r$ are connected in parallel, the total EMF and total internal resistance are: ________.
The resistance of 2 km of a subway track with cross-sectional area 20 $cm^2$ is (in ohm) as a multiple of the specific resistance of steel $\rho$: ________.
A Wheatstone bridge is used to measure ________.