List of top Physics Questions

A string of length \(L\) fixed at both ends vibrates in third harmonic. The distance between consecutive nodes is}

A particle executes SHM with a time period \(T\). If its maximum acceleration is doubled keeping the amplitude constant, its new time period is}

If a thin uniform circular ring and a thin uniform circular disc have the same mass and radius, then the ratio of their moments of inertia about their central axes normal to their planes is}

The power of a motor pump delivering water at a constant speed through a hose of radius \(r\) is \(P\). If the radius of the hose is doubled, then the power of the pump becomes}

Two particles of masses \(m\) and \(2m\) kept 1 m apart are attracted to each other by gravitational force. The acceleration of their centre of mass is \((G = \text{gravitational constant})\)}

A particle of mass \(m\) tied to a string of length \(r\) is whirled in a vertical circle. Its minimum speed at the bottom is}

Two particles A and B at rest initially, start to move simultaneously along the same straight line, A with constant velocity \(5\,ms^{-1}\) and B with constant acceleration \(2\,ms^{-2}\). Then the time after which B overtakes A is}

A particle moves under a force \(F = 3x^2\) N. The work done by the force on the particle in displacing it from \(x=0\) to \(x=2\text{ m}\) is}

0.2 kg ball strikes a wall with velocity \(10\,ms^{-1}\) and rebounds with \(8\,ms^{-1}\). The impulse delivered by the ball is}

The velocity (\(v\)) – time (\(t\)) graph of a particle cuts the time axis, then the particle}

A $250$ watt bulb emits monochromatic light of wavelength $198.78$ nm. How many photons are emitted by the bulb per second? \ (Planck’s constant = $6.626 \times 10^{-34}$ J s and velocity of light = $3 \times 10^8$ ms$^{-1}$)

The focal length of a plane mirror is

The logic gate that performs the operation of an inverter is

The ground state energy of hydrogen atom is -13.6 eV. The energy of the second excited state is

Ripple frequency in full-wave rectifier of input frequency $f$ is:

The width of the depletion layer of a p-n junction diode

In an n-p-n transistor, the majority charge carriers in the emitter are

The de Broglie wavelength of a particle of mass m and kinetic energy E is given by

A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 40 cm. The power of the combination is

The phenomenon of total internal reflection occurs when a ray of light travels from

In a hydrogen atom, the radius of the $n^{th}$ Bohr orbit is proportional to

The binding energy per nucleon is maximum for the nucleus

In Young's double slit experiment, if the distance between the slits is halved and the distance between the slits and the screen is doubled, the fringe width will become

The core of a transformer is laminated to reduce

In an AC circuit containing only a capacitor, the current