List of top Physics Questions asked in KEAM

A passenger of mass m stands on a weighing scale in an elevator accelerating upward with an acceleration of $g/2$. The scale would read ($g=$ acceleration due to gravity)
A block of mass 2 kg slides on a rough horizontal surface with initial speed $10~ms^{-1}$. The distance travelled by the block before it stops is ($g=10~ms^{-2}$, $\mu_{k}=0.2$)
A non-conservative force is one for which
A particle of mass m is initially at rest. A time varying force $F=kt$ acts on it. Its velocity after time t is
The position vector of a particle is given by $\vec{x}=(t^{3}-3t^{2}+2)\hat{i}$, the time at which the velocity of the moving particle becomes zero is
A flywheel in a steam engine ensures a smooth ride for the passengers on the vehicle because it has
The dimensional formula for the rate of change of momentum of a moving body is
If both x and y components of a vector are equal, its angle with x-axis is
The area under the velocity-time graph of a particle is equal to its
If the time period of oscillation of a liquid drop is given by $T=k\sqrt{\frac{\rho r^{4}}{\sigma}}$, where $\rho$ refers to its density, $r$ its radius and $k$ is a dimensionless constant, then $\sigma$ has the units of
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 rate of fall of the voltage across the capacitor in a filter used in a diode rectifier depends
The radius of innermost orbit of an electron in the hydrogen atom is $0.53\,\text{\AA}$. Then, the radius of the 3rd electron orbit is:
The energy released by $2.35\,g$ of $^{235}U$ by fission in a nuclear reactor (in $MeV$) is (Average energy released per fission is $200\,MeV$):
In a silicon crystal containing $N$ atoms, at absolute zero the $4N$ energy states of
A wire of certain length carrying current $I$, when bent into a circular coil of single turn produces a magnetic field $B$ at its centre. If the same wire is bent into a circular coil of 3 turns and it carries the same current, then the magnetic field at the centre of the coil is
The intensity of the transmitted light after passing through a first polaroid $P_1$ is $I_0$. If the second polaroid $P_2$ is rotated through an angle of $45^\circ$ with respect to $P_1$, then the change in the intensity of the transmitted light after passing through the second polaroid is
The order of the electric field required to pull out electrons from a metal by field emission (in $Vm^{-1}$) is
The magnifying power of a simple microscope can be increased by using
When a bar magnet placed parallel to the magnetic field is rotated by $45^\circ$, the amount of work done is $2.07J$. The amount of work to be done to rotate the magnet further by $45^\circ$ is
A real object is placed at distance $f$ in front of a convex mirror of focal length $f$. The image will be formed at a distance
The law that is a symmetrical counterpart of Faraday’s law of electromagnetic induction is
The r.m.s current of an alternating current given by $i = 4\sqrt{2}\sin \omega t + 3\sqrt{2}\cos \omega t$ is:
If an air core solenoid with self-inductance of $0.5\,mH$ is filled with soft iron of relative permeability of $1500$, its self-inductance becomes
For an electron of mass $m_e$ and charge $e$ revolving around the nucleus of an atom, the ratio of its angular momentum to magnetic moment is