List of top Physics Questions

Two identical piano wires have a fundamental frequency of $600 $ cycle per second when kept under the same tension. What fractional increase in the tension of one wires will lead to the occurrence of $6$ beats per second when both wires vibrate simultaneously?
A wire of resistance $12$ ohms per meter is bent to form a complete circle of radius $10 \,cm$. The resistance between its two diametrically opposite points, $A$ and $B$ as shown in the figure is
The number of electron in $2$ coulomb of charge is
For the constructive interference the path difference between the two interfering waves must be equal to
A beam of light of wavelength 600 nm from a distant source falls on a single slit I mm wide and the resulting diffraction-pattern is observed on a screen 2m away. The distance between the first dark fringes on either side of the central bright fringe is
A door of $1.6\, m$ wide requires a force of $1 \,N$ to be applied at the free end to open or close it. The force that is required at a point $0.4\, m$ distant from the hinges for opening or closing the door is
A 100 mH coil carries 1 A current. Energy stored in its magnetic field is
An electric heater rated $220\, V$ and $550\, W$ is connected to $AC$ mains. The current drawn by it is
According to Newton's Corpuscular Theory, the speed of light is
Three resistances $P, Q, R$ each of $2\, \Omega$ and an unknown resistance $S$ form the four arms of a Wheatstone's bridge circuit. When a resistance of $6\, \Omega$ is connected in parallel to $S$ the bridge gets balanced. What is the value of $S$ ?
When air is replaced by a dielectric medium of constant $K$. The maximum force of attraction between two charges separated by a distance:
A particle is projected up from a point at an angle $\theta$ with the horizontal direction. At any time $t$, if $p$ is the linear momentum, $y$ is the vertical displacement, $x$ is horizontal displacement, the graph among the following which does not represent the variation of kinetic energy $KE$ of the particle is
A particle of mass $4 \,m$ explodes into three pieces of masses $m, m$ and $2 \,m$. The equal masses move along $X$-axis and $Y$-axis with velocities $4\, ms ^{-1}$ and $6\, ms ^{-1}$ respectively. The magnitude of the velocity of the heavier mass is
The two lenses of an achromatic doublet should have
If the ratio of lengths, radii and Young's modulus of steel and brass wires shown in the figure are $a, b $ and $c$ respectively, the ratio between the increase in lengths of brass and steel wires would be
Hydrogen atom from excited state comes to the ground state by emitting a photon of wavelength $\lambda$. If $R$ is the Rydberg constant, the principal quantum number $'n'$ of the excited state is
Sound waves transfer
The magnetic dipole moment of a current loop is independent of
Near a circular loop of conducting wire as shown in the figure an electron moves along a straight line. The direction of the induced current if any in the loop is
The angle of minimum deviation for an incident light ray on an equilateral prism is equal to its refracting angle. The refractive index of its material is
A graph of pressure versus volume for an ideal gas for different processes is as shown. In the graph curve $OC$ represents
The spectral series of the hydrogen atom that lies in the visible region of the electromagnetic spectrum
The work done by a force acting on a body is as shown in the graph. The total work done in covering an initial distance of $20\,m$ is
The resistance of a wire at $300 \, K$ is found to be $0.3 \, \Omega$. If the temperature co-efficient of resistance of wire is $1.5 \times 10^{-3} K^{-1}$, the temperature at which the resistance becomes $0.6\, \Omega$ is
Three concurrent co-planar forces $1\,N, 2\,N$ and $3\,N$ acting along different directions on a body