List of top Physics Questions

If \(f_{s}\) and \(f_{k}\) represent the coefficients of static friction and kinetic friction of the relative motion between two surfaces in contact with area A, then
If \(\theta\) is the angle of projection of an object for which the horizontal range is equal to the maximum height attained, then the value of \(\tan \theta\) is
The velocity of a swimmer in the direction of flow of river is \(10 \, \text{kmh}^{-1}\) and that against the flow of river is \(6 \, \text{kmh}^{-1}\). The velocity of the swimmer in still water in \(\text{kmh}^{-1}\) is
The ratio of the distance of the sun from the earth to that of the moon from the earth is of the order of
If a freely falling body from the top of a tower takes 3 s and 5 s to cross the \(28^{th}\) floor and \(4^{th}\) floor respectively, then the height difference between these floors is \((g = 10 \, \text{ms}^{-2})\)
The dimensional formula for the product of moment of inertia and the square of angular velocity is
In a full wave rectifier, for an input ac voltage
In a hydrogen atom, the transition of an electron from the energy level, \(n_2 = \infty\) and \(n_1 = 3\) is the
Semiconductors are
If N is the initial number of atoms in a radioactive sample, then the number of atoms decayed after the five half life periods is
In Young's double slit experiment using a source of wavelength \(\lambda\) interference bands are observed on a screen. If the separation between the slits alone is halved in this experiment, then the angular separation \(\omega\) of the fringes on the screen becomes
The ratio of the speed of light in vacuum to that in a medium is called
The distance of an object placed in front of a concave mirror of radius of curvature 24 cm that gives its magnification as 3 is
The velocity of light in a medium of relative permittivity 2 and relative permeability 4.5 is (velocity of light in free space is c)
The diamagnetic and paramagnetic materials at 300 K are respectively,
The mismatched pair regarding the induced emf is
If a rectangular loop carrying a current I and area ab is placed such that a uniform magnetic field B is in the plane of the loop, then the magnitude of torque on it is
If an electric bulb of resistance \(400 \Omega\) is connected to an ac source of peak voltage 282.8 V, then the electric power of the bulb is
The maximum current drawn from a battery of 12 V with internal resistance of \(0.5 \Omega\) is
If \(\tau\) is the average time between any two successive collisions for the electrons in a metal wire under the application of an electric field E, then the mobility \(\mu\) of the electrons is
Three identical resistors are connected in the form of a triangular mesh ABC. If a battery of 12 V is connected across AB, then the ratio of the current flowing through AB to that through ACB is
According to Biot-Savart's law, the magnetic field B is
Two identical isolated capacitors A and B are charged so that each has a charge of 4C. If a charge of \(-2C\) is added to A and \(+2C\) to B, then the ratio of respective potentials is
If the torque acting on an electric dipole when placed at an angle \(30^{\circ}\) with the direction of a uniform electric field is \(\tau\), then the torque acting on the same dipole when placed in the same field at an angle \(45^{\circ}\) is
A conductor with an air core cavity inside, is charged to attain the surface charge density of \(\sigma\). If E is the magnitude of electric field and V is the potential, then inside the cavity