List of top Physics Questions asked in KEAM

Two wires $A$ and $B$ of same material and of equal length with the radii in the ratio $1 : 2$ are subjected to identical loads. If the length of $A$ increases by $8\, mm$, then the increase in length of $B$ is
Pick out the correct statement in the following with reference to stationary wave pattern
The electrical conductivity of an intrinsic semiconductor at 0K is
If the time taken by a hot body to cool from $50^{\circ}$C to $40^{\circ}$C is 10 minutes when the surrounding temperature is $25^{\circ}$C. then the time taken for it to cool from $40^{\circ}$C to $30^{\circ}$C when the surrounding temperature is $15^{\circ}$C, is
Total number of degrees of freedom of a rigid diatomic molecule is
In amplitude modulation, the bandwidth is
A simple pendulum is taken from the equator to the pole. lts period
If the mass of moon is $ \frac{1}{90} $ of earths mass, its radius is $ \frac{1}{3} $ of earths radius and if $ g $ is acceleration due to gravity on earth, then the acceleration due to gravity on moon is ...... :
In an L-C-R series AC circuit, if $\omega_0$ is the resonant angular frequency, then the quality factor (Q-factor) is given by
Electrical conductivity is the reciprocal of
When the angle of incidence on a material is 60$^{\circ}$, the reflected light is completely polarized. The velocity of the refracted ray inside the material is (in $ms^{-1}$)
Two blocks of masses 7 kg and 5 kg are placed in contact with each other on a smooth surface. lf a force of 6 N is applied on the heavier mass, the force on the lighter mass is
According to the work-energy theorem, the work done by the net force on a particle is equal to the change in its
Two identical spheres of radius $R$ made of the same material are kept at a distance $d$ apart. Then the gravitational attraction between them is proportional to
Identify the wrong statement from the following
Two identical magnetic dipoles of magnetic moment $2\, A\, m^2$ are placed at a separation of $2\, m$ with their axes perpendicular to each other in air. The resultant magnetic field at a midpoint between the dipoles is
Two plane wavefronts of light, one incident on a thin convex lens and another on the refracting face of a term prism. After refraction at them, the emerging wavefronts respectively become
A slit of width a is illuminated by red light of wavelength $ 6500\, \overset{\text{o}}{\mathop{\text{A}}}\, $ . If the first minimum falls at $ \theta =30{}^\circ , $ the value of $ a $ is
Three bricks each of length $L$ and mass $M$ are arranged as shown from the wall. The distance of the centre of mass of the system from the wall is
Dimensional formula of Stefan's constant is
Five cells each of emf $E$ and internal resistance $r$ send the same amount of current through an external resistance $R$ whether the cells are connected in parallel or in series. Then the ratio $\left( \frac{R}{r} \right)$ is
Two equal forces are acting at a point with an angle of 60$^{\circ}$ between them. If the resultant force is equal to $40\sqrt{3}$, the magnitude of each force is
From a balloon is moving Upwards with velocity $12\, ms^{-1}$. It releases a packet when it is at a height of $65\,m$ from the ground. How much time the packet will take to reach the ground $\left(g=10m/sec^2\right)$
Two resistors of resistances $ 200\,k\Omega $ and $ 1\,M\Omega $ respectively form a potential divider with outer junctions maintained at potentials of $ +3V $ and $ -15V $ . Then, the potential at the junction between the resistors is
In the circuit shown, the current through the $ 5\,\Omega $ resistor is