List of top Physics Questions asked in KEAM

Electric charge is uniformly distributed along a long straight wire of radius $1\,mm$. The charge per cm length of the wire is $Q$ coulomb. Another cylindrical surface of radius $50 \,cm$ and length $1\, m$ symmetrically encloses the wire. The total electric flux passing through the cylindrical surface is
A particle starts from rest at $ t=0 $ and moves in a straight line with an acceleration as shown in figure. The velocity of the particle at $ t=3\text{ }s $ is
Two particles $A$ and $B$ having equal charges $+6\, C$, after being accelerated through the same potential difference, enter a region of uniform magnetic field and describe circular paths of radii $2\,cm$ and $3\, cm$ respectively. The ratio of mass of $A$ to that of $B$ is
In Young?s double slit experiment, to increase the fringe width
The eiectric field E, current density j and conductivity $\sigma$ of a conductor are related as
A particle acted upon by constant forces $( 4\hat{i}+\hat{j}-3\hat{k} )$ and $( 3\hat{i}+\hat{j}-\hat{k} )$ is displaced from the point $( \hat{i}+2\hat{j}+3\hat{k} )$ to the, point $ (5\hat{i}+4\hat{j}+\hat{k} )$ . The total work done by the forces in $SI$ unit is
The force acting on a window of area $50 \,cm \times 50\, cm$ of a submarine at a depth of $2000\, m$ in an ocean, the interior of which is maintained at sea level atmospheric pressure is (Density of sea water $= 10^{3} \, kg \,m^{-3}$, $g = 10 \,m \,s^{-2}$)
The principle of superposition is basic to the phenomenon of
In an amplitude modulation with modulation index $0.5$, the ratio of the amplitude of the carrier wave to that of the side band in the modulated wave is
A simple pendulum of frequency n falls freely under gravity from certain height from the ground level. Its frequency of oscillation will
If V is the gravitational potential on the surface of the earth, then what is its value at the centre of earth?
The power dissipated in an AC circuit is zero if the circuit is
From the ground, a projectile is fired at an angle of $60$ degrees to the horizontal with a speed of $20\, m/s^{-1}$. Take acceleration due to gravity as $10 \, m/s^{-2}$. The horizontal range of the projectile is
Light travels in two media $A$ and $B$ with speeds $1.8 \times 10^8 ms^{-1}$ and $ 2.4 \times 10^8 ms^{-1}$ respectively. Then the critical angle between them is
A particle moving in a straight line covers half the distance with speed of $3 ms^{-1}$. The other half of the distance is covered in two equal time intervals with speed of $4.5\, ms^{-1}$ and $7.5\, ms^{-1}$ respectively. The average speed of the particle during this motion is
A potentiometer wire, $ 10 \,m $ long, has a resistance of $ 40\,\Omega $ . It is connected in series with a resistance box and a $ 2 \,V $ storage cell. If the potential gradient along the wire is $(0.1\, mV/cm)$, the resistance unplugged in the box is
Two electric charge 12 $\mu$C and -6 $\mu$C are placed 20 cm apart in air. There will be a point P on the line joining these charges and outside the region between them, at which the electric potential is zero, The distance of P from -6 $\mu$C charge is
The effective resistance across the points A and I is
The magnetic induction field has the dimensions of
If the road is unbanked and the coefficient of friction between the road and the tyres is $ 0.8 $ , then the maximum speed with which an automobile can move around a curve of $ 84.5 \, m $ radius without slipping $ (g=10\text{ }m{{s}^{-2}}) $ is
The electrical conductivity of an intrinsic semiconductor at 0K is
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
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