List of top Physics Questions

A stationary wave is formed having 4 nodes along the $120\,\text{cm$ length of the string. The wavelength of the wave is}

A pendulum is oscillating with frequency $n$ on the surface of earth. It is taken to depth $\dfrac{R{2}$ below the surface of earth where $R$ is radius of earth. The new frequency of oscillations at depth $\dfrac{R}{2}$ is}

Two identical thin bar magnets are placed mutually at right angles such that the north pole of one touches the south pole of the other. The length of each bar magnet is $\ell$. The magnitude of resultant magnetic moment of the system is
$\left[m = \text{pole strength of the magnet}\right]$

In biprism experiment, a source of monochromatic light is used for a certain distance between slit and eyepiece. When the distance between two virtual sources is changed from $d_A$ to $d_B$, then the fringe width is changed from $Z_A$ to $Z_B$. The ratio $Z_A$ to $Z_B$ is

A string of mass $0.1\,\text{kg$ is under a tension $1.6\,\text{N}$. The length of the string is $1\,\text{m}$. A transverse wave starts from one end of the string. The time taken by the wave to reach the other end is}

A parallel beam of monochromatic light of wavelength $5\times10^{-7\,\text{m}$ is incident normally on a single narrow slit of width $10^{-3}\,\text{mm}$. At what angle of diffraction, the first minima is observed?}

For a particle performing S.H.M., the displacement–time graph is as shown.

Relative permeability of an iron is $5500$, then its magnetic susceptibility will be

Two concentric circular coils having radii $r_1$ and $r_2$ $(r_2 \ll r_1)$ are placed co-axially with centres coinciding. The mutual induction of the arrangement is (Both coils have single turn, $\mu_0$ = permeability of free space)

The excess pressure inside a spherical drop of water is three times that of another drop of water. The ratio of their surface area is

If the potential difference used to accelerate electrons is doubled, by what factor does the de-Broglie wavelength associated with the electrons change?

A solid sphere of mass $M$ and radius $R$ is rotating about its diameter. A disc of same mass and radius is also rotating about an axis passing through its centre and perpendicular to the plane but angular speed is twice that of the sphere. The ratio of kinetic energy of disc to that of sphere is

A graph of magnetic flux $\phi$ versus current $(I)$ is shown for four inductors A, B, C, D. Smaller value of self inductance is for inductor

Earth revolves round the sun in a circular orbit of radius $R$. The angular momentum of the revolving earth is directly proportional to

Two progressive waves $Y_1=\sin 2\pi\left(\dfrac{t}{4}-\dfrac{x}{4}\right)$ and $Y_2=\sin 2\pi\left(\dfrac{t}{4}+\dfrac{x}{4}\right)$ superpose to form a standing wave. $Y_1$ and $Y_2$ are in SI system. Amplitude of the particle at $x=0.5\,\text{m$ is}
$\left[\sin 45^\circ=\cos 45^\circ=\dfrac{1}{\sqrt{2}}\right]$

Let the two forces have equal magnitude $A$. If the magnitude of the resultant is $\dfrac{2A{3}$, then the angle between those two forces is}

In the experiment to determine the internal resistance of a cell ($E_1$) using potentiometer, the resistance drawn from the resistance box is $R$. The potential difference across the balancing length of the wire is equal to the terminal potential difference $(V)$ of the cell. The value of internal resistance $(r)$ of the cell is

Two spheres $S_1$ and $S_2$ have radii $R$ and $3R$, temperature $T$ K and $\dfrac{T{\sqrt{3}}$ K respectively. If they are coated with a material of same emissivity, rate of radiation of $S_1$ is $E$ then rate of radiation of $S_2$ is}

The refractive index of glass is \( \frac{3}{2} \) and that of water is \( \frac{4}{3} \). The critical angle for a ray of light going from glass to water is

A galvanometer of resistance \(100\,\Omega\) requires \(10\,\mu\text{A}\) current for full scale deflection. Now a resistance of \(1\,\Omega\) is connected to convert it into an ammeter. The minimum current required to obtain full scale deflection is

Two bodies have their moments of inertia \(I\) and \(2I\) respectively about their axes of rotation. If their kinetic energies of rotation are equal, their angular momenta will be in the ratio

A particle performing U.C.M. of radius \( \dfrac{\pi}{2}\,\text{m} \) makes \(x\) revolutions in time \(t\). Its tangential velocity is

A bar magnet of magnetic moment \(5\,\text{A m}^2\) is placed in a uniform magnetic induction \(3\times10^{-5}\,\text{T}\). If each pole of the magnet experiences a force of \(2.5\times10^{-4}\,\text{N}\), then the magnetic length of the magnet is

A ring and a disc have same mass and same radius. The ratio of moment of inertia of a ring about a tangent in its plane to that of the disc about its diameter is

Water rises to a height of \(15\,\text{mm}\) in a capillary tube having cross-sectional area \(A\). If the cross-sectional area of the tube is made \( \dfrac{A}{3} \), then the water will rise to a height