List of top Physics Questions asked in KEAM

If a body of mass \(m\) has to be taken from the surface of earth to a height \(h = R\), then the amount of energy required is (\(R\): radius of earth)
A body oscillates with SHM according to the equation (in SI units), $x = 5 cos \left(2\pi t +\frac{\pi}{4}\right) .$ Its instantaneous displacement at $t = 1$ second is
The dimensions of mobility of charge carriers are
The speed of light in an isotropic medium depends on
The fusion reaction in the sun is a multi-step process in which the
A uniform wire of resistance 9 $\Omega$ is joined end-to-end to form a circle. Then the resistance of the circular wire between any two diametrically opposite points is
A particle has the position vector ${r} = \hat{i} - 2\hat{j } + \hat{k}$ and the linear momentum ${p} = 2\hat{i} - \hat{j} + \hat{k}$. Its angular momentum about the origin is
The time period of revolution of a charge $q_1$ and of mass $m$ moving in a circular path of radius $r$ due to Coulomb force of attraction with another charge $q_2$ at its centre is
Two blocks of masses $2\,kg$ and $4\,kg$ are attached by an inextensible light string as shown in the figure. If a force of $120\,N$ pulls the blocks vertically upward, the tension in the string is (take $g = 10\, ms^{-2}$)
The significant result deduced from the Rutherford�s scattering experiment is that
A particle moving in a circular path has an angular momentum of L. If the frequency of rotation is halved, then its angular momentum becomes
A packet is dropped from a flight ascending with a velocity at height of 10 km. If the packet takes 100 s to reach the ground,^then the velocity of the flight is (Take = 10 ms$^{-2}$ )
The angle between the linear momentum and angular momentum of a particle in circular motion is
The self-inductance of an air core solenoid of $100$ turns is $1\, mH$. The self-inductance of another solenoid of $50\, turns$ (with the same length and cross-sectional area) with a core having relative permeability $500$ is
Two bulbs 60 W and 100 W designed for voltage 220 V are connected in series across 220 V source. The net power dissipated is
The quantity which has the same dimensions as that of gravitational potential is
The total number of acyclic structural isomers possible for compound with molecular formula $C_4H_{10}O$ is
The torque of a force$\overrightarrow{F} = 2\hat{i} - 3\hat{j} +5\hat{k}$ acting at a point whose position vector $\overrightarrow{r} = 3\hat{i} - 3\hat{j} + 5\hat{k}$about the origin is
In an inelastic collision
The vibrations of a string of length $60\, cm$ fixed at both the ends are represented by the equation $y=2 sin \left(\frac{4\pi x}{15}\right) cos \left(96\pi t\right)$ where $x$ and $y$ are in cm. The maximum number of loops that can be formed in it is
The heart is pumping blood at x kg per unit time, with a constant velocity v. The force required is
A travelling harmonic wave on a string is described by $y$ = 7.5 sin (0.005$x$ + 12$t$) in metre. Its time period in second is
A carpet of mass $m$ made of inextensible material is rolled along its length in the form of a cylinder of radius $r$ and kept on a rough floor. The decrease in the potential energy of the system, when the carpet is unrolled to a radius $\frac{r}{2}$ without sliding is $(g=$ acceleration due to gravity)
The electric potential V at any point $(x, y, z)$ in space is given by $V = 3x^{2}$ where $x, y, z$ are all in metre. The electric field at the point (1 m, 0, 2 m) is
The graph between displacement and time for a particle moving with uniform acceleration is a