List of top Physics Questions asked in KEAM

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

Two charged particles $2q$ and $q$ having equal momentum enter a uniform magnetic field in a direction perpendicular to the magnetic field. Then their respective radii of circular paths $r_1$ and $r_2$ are in the ratio

Two cells each of $2V$ and internal resistance $0.1\,\Omega$ are connected in parallel combination. This combination is equivalent to a single cell with emf and internal resistance of

If a spherical conductor of $10\,cm$ radius contains $5 \times 10^6$ electrons, then the electric field on its surface (in $NC^{-1}$) is

In the equation $A = \dfrac{B}{CD^2}$, if $B, C$ and $D$ have the dimensions of inductive reactance, capacitive reactance and angular frequency respectively, then the dimensions of $A$ are:

The physical quantity that doesn’t have appropriate unit is

Which one of the following statements is CORRECT?

The position of a particle moving along $y$-axis is given as $y = t^2 + 2t + 3$. The average acceleration of the particle between $t=3s$ and $t=6s$ (in $ms^{-2}$) is

The ratio of distances traversed by a freely falling body in successive intervals of time is

The angular momentum of a uniform rod of mass $m$ and length $l$, rotating in a horizontal circle about one of its ends with an angular velocity $\omega$ is

The maximum and minimum distances of a satellite revolving in an elliptical orbit are in the ratio $3:1$. If the speed of the satellite at the nearest distance is $v$, then the speed at the farthest distance is

The ratio of the magnitudes of gravitational potential energy to that of kinetic energy of an earth satellite of mass $m$ revolving in any orbit is

A uniform metallic wire of radius $r$ and length $l$ is heated by passing a current through it. The heat produced can be made 8 times if

The mass of one molecule of water is approximately

If the drift velocity of electrons in a copper wire of cross-sectional area $2\,mm^2$ carrying current $I$ is $v_1$ and that in another copper wire of cross-sectional area $1.5\,mm^2$ carrying current $2I$ is $v_2$, then the ratio $v_1 : v_2$ is

When a capacitor of $9\,pF$ is connected to a battery, the electrostatic energy stored in the capacitor is $18 \times 10^{-8}J$. The quantity of charge stored in the capacitor is: