List of top Physics Questions

A ray of light travelling through glass of refractive index \( \sqrt{2} \) is incident on glass-air boundary at an angle of incidence 45°. If refractive index of air is 1, then the angle of refraction will be
A diatomic gas undergoes adiabatic change. Its pressure \( P \) and temperature \( T \) are related as \( P \propto T^x \), where \( x \) is
A step-up transformer has 300 turns of primary winding and 450 turns of secondary winding. A primary is connected to 150 volt and the current flowing through it is 9A. The current and voltage in the secondary are
A spherical rubber balloon carries a charge, uniformly distributed over the surface. As the balloon is blown up and increases in size, the total electric flux coming out of the surface
An \( \alpha \) particle of energy 10 eV is moving in a circular path in a uniform magnetic field. The energy of proton moving in the same path and same magnetic field will be [mass of \( \alpha \) particle = 4 times mass of proton]
Which of the following instruments is \textit{NOT} a direct reading instrument?
A transistor has a voltage gain \( A \). If the amount \( \beta A \) of its output is applied to the input of the transistor, then the transistor becomes oscillator when
A simple pendulum of length \( \ell \) has a bob of mass \( m \). It executes S.H.M. of small amplitude \( A \). The maximum tension in the string is
The magnetic susceptibility of a paramagnetic material at \( -73^\circ \text{C} \) is \( 0.0075 \). Its value at \( -173^\circ \text{C} \) will be
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
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
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
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
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 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
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 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)}
Two vectors of same magnitude have a resultant equal to either of the two vectors. The angle between two vectors is
In diffraction experiment, from a single slit, the angular width of the central maxima does NOT depend upon
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)}
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