List of top Physics Questions

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)

A capacitor is charged by a battery and energy stored is $U$. Now the battery is removed and the distance between plates is increased to four times. The energy stored becomes

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?

Which one of the following statements is NOT the property of light?

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

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

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

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}

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

The figure shows two diagrams in which diode and resistance are connected. Out of the following statements which one is TRUE?

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

Seven capacitors each of capacitance $2\,\mu F$ are to be connected to obtain equivalent capacitance of $\dfrac{10{11}\,\mu F$. Which of the following combination is possible?}

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}

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

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

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

Four capacitors of equal capacity have an equivalent capacitance \(C_1\) when connected in series and an equivalent capacitance \(C_2\) when connected in parallel. The ratio \(\dfrac{C_2}{C_1}\) is

A black body has maximum wavelength \(\lambda_m\) at temperature \(2200\,\text{K}\). Its corresponding wavelength at temperature \(3300\,\text{K}\) will be

Three condensers of capacities \(C_1, C_2, C_3\) are connected in series with a source of e.m.f. \(V\). The potentials across the three condensers are in the ratio of

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

If the kinetic energy of a particle is increased to 16 times its previous value, the percentage change in the de-Broglie wavelength of the particle 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