List of top Physics Questions

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 ________.
The direction of the electric field due to a positive charge is ________.
The torque on an electric dipole consisting of charges $q$ and $-q$ of dipole moment $P$ in a uniform electric field $E$ is ________.
The electric field inside a uniformly charged spherical shell of radius R is ________.
The number of nodes and antinodes in a guitar string vibrating in the third harmonic is ________.
The principle of superposition in wave motion states that ________.
In a simple harmonic motion, ________.
For an ideal gas of molar mass M, the slope of the plot between the rms velocity ($v_{rms}$ along y-axis) and the square root of absolute temperature ($\sqrt{T}$ along x-axis) is ________.
The translational kinetic energy of an ideal gas containing N molecules at temperature T is (k - Boltzmann constant) ________.
The ratio of specific heat capacities ($C_p/C_v$) of a diatomic gas is ________.