List of top Physics Questions asked in KEAM

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)
In simple harmonic motion (SHM), the acceleration of a particle at a displacement of 3m from the mean position is $48\text{ m/s}^2$ directed towards the mean position. Find the angular frequency.
A particle moves in a circular path of radius 4 cm. It completes 5 revolutions in 2 minutes. Find its linear velocity.
A particle moves in a circular path of radius 4 cm
$\vec{P} = x\hat{i} + 0.8\hat{j} + 0.6\hat{k}$ If magnitude of $\vec{P}$ is 2, value of x is
The capacitance of a capacitor is C when there is air (or vacuum) between its plates. When a dielectric is completely inserted between the plates, the capacitance becomes 2C. Find the dielectric constant of the material.
A spring of spring constant 'k' cut into n pieces. What is the spring constant of each piece?
Two syringes have piston in the ratio 1 : 5. If the pressure exerted in both syringes is same, find the ratio of the forces applied on the piston.
The displacement of a body at any time t is given by \[ x = -\frac{3}{4}t^2 + 12t + 3 \] The velocity of the body is zero after:
Energy of electron of hydrogen atom in $3^{\text{rd}}$ excited state is
Which of the following is diamagnetic
A cyclotron has frequency f and energy E. If the energy is doubled, frequency becomes
If external force acting on a body is zero, centre of mass of body
In a forward biased semiconductor potential changes from 0.9V to 0.6 V. Find current if resistance is $1\Omega$
A constant current of 3A flows through a conductor having potential difference of 200V. Find heat developed in conductor in 25s.
Potential difference between two points in a region having uniform electric field of $800\text{ N/C}$ is $16\text{V}$. Find the distance between two points.
What is the specific heat capacity at constant volume for non-rigid diatomic gas.
In a Young's double slit experiment with a light having wavelength 500 nm, separation between slit is 0.2 mm, distance between slit and screen is 2m. Find fringe width.
An effective power of a combination of 5 identical convex lens having focal length f= 20 cm is
The work function for a metal having threshold frequency $5\times 10^7\text{ Hz}$ is?