List of top Physics Questions

An electromagnetic wave of frequency $ \upsilon $ = 3.0 MHz passes from vacuum into a dielectric medium with relative permittivity $\varepsilon$ = 4.0. Then
A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices $\mu_1$ and $\mu_2$ and $R$ is the radius of curvature of the curved surface of the lenses, then the focal length of combination is
In Young's double slit experiment, the slits are 2mm apart and are illuminated by photons of two wavelengths $\lambda_1 = 12000 \mathring A $ and $\lambda_2 = 10000 \mathring A.$ At what minimum distance from the common central bright fringe on the screen 2m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other ?
When an object is placed $40\,cm $ from a diverging lens, its virtual image is formed $20\,cm$ from the lens. The focal length and power of lens are
Unpolarized light falls on two polarizing sheets placed one on top of other. If the intensity of transmitted light is one fourth of the incident light, the angle between them is
A particle moving in a circular path has an angular momentum of L. If the frequency of rotation is halved, then its angular momentum becomes
The self-inductance of an air core solenoid of $100$ turns is $1\, mH$. The self-inductance of another solenoid of $50\, turns$ (with the same length and cross-sectional area) with a core having relative permeability $500$ is
The angle between the linear momentum and angular momentum of a particle in circular motion is
A packet is dropped from a flight ascending with a velocity at height of 10 km. If the packet takes 100 s to reach the ground,^then the velocity of the flight is (Take = 10 ms$^{-2}$ )
The dimensional formula of electric potential is
The power $(P)$ of an engine lifting a mass of $ 100\,kg$ up to a height of $ 10\,m $ in $ 1\,\min $ is
The displacement, velocity and acceleration in a simple harmonic motion are related as the
The alternating current in a circuit is given by $ I=50\,\sin \,314\,t $ . The peak value and frequency of the current are
The transverse nature of electromagnetic waves is proved by which of the following?
The induced emf in a coil of $10$ Henry inductance in which current varies from $9\,A $ to $4\,A$ in $0.2$,second is
Polonium has a half-life of $140$ days. If we take $20\,g$ of polonium initially then the amount of it that remains after $280$ days is
Two identical capacitors are first connected in series and then in parallel. The ratio of equivalent capacitance is
The position vector of a point $R$ which divides the line joining $ P(6,\,3,-2) $ and $ Q(3,1,-4) $ Q(3,1, - 4) in the ratio $ 2:1 $ externally is
The conservation of angular momentum demands that
The Brewster's law is given by the expression
A long straight wire is carrying a current of $ 12\,A $. The magnetic field at a distance of $ 8\,cm$ is $ (\mu _{0}=4\pi \times 10^{-7}\,N/A^{2}) $
The centripetal force is given by the expression
Which of the following physical quantity unit is not a fundamental unit?
The net electric force on a charge of $ +3\,\mu C $ at the mid-point on the line joining two charges of magnitude $ +2\,\mu C $ and $ -2\,\mu C $ separated by the distance of $6\,mm, $ is
Four small objects each of mass m are fixed at the corners of a rectangular wire-frame of negligible mass and of sides $a$ and $b (a > b)$. If the wire frame is now rotated about an axis passing along the side of length b, then the moment of inertia of the system for this axis of rotation is