List of top Physics Questions

The magnetic susceptibility of a paramagnetic material at \( -73^\circ \text{C} \) is \( 0.0075 \). Its value at \( -173^\circ \text{C} \) will be

A body slides down a smooth inclined plane having angle \( \theta \) and reaches the bottom with velocity \( v \). If a body is a sphere then its linear velocity at the bottom of the plane is

Two spherical black bodies of radius \( r_1 \) and \( r_2 \) with surface temperature \( T_1 \) and \( T_2 \) respectively, radiate the same power, then \( \frac{r_1}{r_2} \) is

The graph of kinetic energy against the frequency \( v \) of incident light is as shown in the figure. The slope of the graph and intercept on X-axis respectively are

A thin light weight rod of diamagnetic substance such as silver is suspended in a uniform external magnetic field. It will align itself with its length

A thin uniform rod has mass \( M \) and length \( L \). The moment of inertia about an axis perpendicular to it and passing through the point at a distance \( \frac{L}{3} \) from one of its ends, will be

When wavelength of light used in optical instruments A and B are 4500Å and 6000Å respectively, the ratio of resolving power of A to B will be

The light of wavelength \( \lambda \) incident on the surface of metal having work function \( \phi \) emits the electrons. The maximum velocity of electrons emitted is

The work done in blowing a soap bubble of radius \( R \) is \( W \). The work done in blowing a bubble of radius \( 2R \) of the same soap solution is

The ratio of radii of gyration of a ring to a disc (both circular of same radii and mass), about a tangential axis perpendicular to the plane is

Two wires A and B are stretched by the same load. The radius of wire A is double the radius of wire B. The stress on the wire B as compared to the stress on the wire A is

A particle starting from rest moves along the circumference of a circle of radius \( r \) with angular acceleration \( \alpha \). The magnitude of the average velocity, in the time it completes the small angular displacement \( \theta \), is

The density of a metal at normal pressure \( P \) is \( \rho \). When it is subjected to an excess pressure, the density becomes \( \rho' \). If \( K \) is the bulk modulus of the metal, then the ratio \( \frac{\rho'}{\rho} \) is

A charge \( q \) moves with velocity \( \vec{v} \) through electric field \( \vec{E} \) as well as magnetic field \( \vec{B} \). Then the force acting on it is

Two vectors of same magnitude have a resultant equal to either of the two vectors. The angle between two vectors is

A small metal sphere of mass \( M \) and density \( \rho_1 \), when dropped in a jar filled with liquid moves with terminal velocity after some time. The viscous force acting on the sphere is
\textit{(where \( \rho_2 \) is the density of liquid, \( g \) is the gravitational acceleration)}

Let force \( F = A \sin(Ct) + B \cos(Dx) \) where \( x \) and \( t \) are displacement and time respectively. The dimensions of \( \frac{C}{D} \) are same as dimensions of

A bullet of mass \( m \) moving with velocity \( v \) is fired into a wooden block of mass \( M \). If the bullet remains embedded in the block, the final velocity of the system is

A vehicle of mass \( M \) is moving with momentum \( P \) on a rough horizontal road. The coefficient of friction between the tyres and the horizontal road is \( \mu \). The stopping distance is
\textit{(g = acceleration due to gravity)}

For a particle performing simple harmonic motion, when displacement is \( x \), the potential energy and restoring force acting on it is denoted by \( E \) and \( F \) respectively. The relation between \( x \), \( E \), and \( F \) is

In diffraction experiment, from a single slit, the angular width of the central maxima does NOT depend upon

An alternating e.m.f. of 0.2 V is applied across an LCR series circuit having \( R = 4 \, \Omega \), \( C = 80 \, \mu \text{F} \), and \( L = 200 \, \text{mH} \). At resonance, the voltage drop across the inductor is

The maximum velocity of the photoelectron emitted by the metal surface is \( V \). Charge and mass of the photoelectron are denoted by \( e \) and \( m \) respectively. The stopping potential in volt is

For a gas, \( \frac{R}{C_V} = 0.4 \), where \( R \) is universal gas constant and \( C_V \) is the molar specific heat at constant volume. The gas is made up of molecules which are

When a photon enters glass from air, which one of the following quantity does NOT change?