List of top Physics Questions

Energy of radiation incident on a perfect absorbing surface per unit are in unit time is 3.6J. The radiation pressure is:
If temperature is constant and the electric field is doubled then the drift velocity of electrons in a conductor.
An object of mass m is placed in a lift moving upward with acceleration g/2. Find apparant weight.
Time period of a particle is \( T = k\sqrt{\frac{\rho r^3}{\sigma}} \), where \( k \) is a dimensionless constant, \( \rho \) is density, and \( r \) is radius. The dimension of \( \sigma \) is same as
If two objects of mass $m_1 = 80$g and $m_2 = 120$g moves with same speed 6cm/s, find the velocity of centre of mass
Displacement of a particle is given by \( x = t^{3/2} + 2 \). Find the time at which velocity becomes zero.
An oil drop of charge q and mass m is in equilibrium in an electric field E. The charge of the oil drop is
Two springs with constants k and 2k are connected in series and a mass m is hanged. The time period of oscillation is
An $\alpha$ particle and proton are accelerated in cyclotron under idential conditions. Find the ratio of their cyclotron frequncy
A Bar magnet has a magnetic moment M and length l. If its length is reduced to half, find its new magnetic moment.
The graph between displacement and time for a particle moving with uniform acceleration is a ____.
Calculate the ratio of potential energy to kinetic energy at time \(t=\dfrac{T}{6}\) for a particle starting SHM from its mean position.
A cube of edge 4 cm has mass 256 g. The density of the material in SI unit is:
A ball is thrown upwards with a velocity of \(20\ \text{m/s}\); find the maximum height reached \((g = 10\ \text{m/s}^2)\).
The horizontal range of a projectile is maximum when the angle of projection is ____.
The dimensions for the gravitational constant $G$ are ____.
The slope of the tangent drawn on a position-time graph at any instant is equal to the instantaneous ____.
If the potential at A is zero, potential at B is
The work functions of two metals are 2.75 eV and 2 eV respectively. If these are irradiated by photons of energy 3 eV, the ratio of maximum momenta of the photoelectrons emitted respectively by them is
The magnetic flux (in weber) linked with a coil of resistance 10 Ω is varying with respect to time \( t \) as \( \phi = 4t^{2} + 2t + 1 \). Then the current in the coil at time \( t = 1 \) second is
A plane electromagnetic wave travels in free space along X-direction. If the value of B (in tesla) at a particular point in space and time is \( 1.2 \times 10^{-8} \hat{k} \). The value of E (in Vm⁻¹) at that point is
The de Broglie wavelength and kinetic energy of a particle is 2000 Å and 1 eV respectively. If its kinetic energy becomes 1 MeV, then its de Broglie wavelength is
The electromagnetic waves travel with
When ice at $0^\circ\text{C}$ is heated and converted into steam at $100^\circ\text{C}$, which graph correctly represents the variation of temperature with heat supplied?
The force experienced by the Earth due to solar radiation is $9 \times 10^9$, N. Find the radiation pressure on Earth. (Radius of Earth R = $6.4 \times 10^6$, m)