List of top Physics Questions asked in KEAM

A train is moving at $ 30\text{ }m{{s}^{-1}} $ in still air. The frequency of the locomotive whistle is $ 500\, Hz $ and the speed of sound is $ 345\text{ }m{{s}^{-1}} $ . The apparent wavelength of sound in front of and behind the locomotive are respectively

A spring stores $1\,J$ of energy for a compression of $1\,mm$. The additional work to be done to compress it further by $1\,mm$ is

A spherical ball of diameter $1\,cm$ and density $5\times10^3\, kg\, m^{-3}$ dropped gently in a large tank containing viscous liquid of density $3\times 10^3 kg\, m^{-3}$ and coefficient of viscosity $0.1\, Ns\, m^{-2}$.The distance, the ball moves in 1s after attaining terminal velocity is ($g \,=\, 10 \,ms^{-2}$)

A satellite is launched in a circular orbit of radius $ R $ around the earth. A second satellite is launched into an orbit of radius $ 1.01\,R $ . The period of second satellite is longer than the first one (approximately) by

The position vector of the particle is $\vec{r} (t) = a \, \cos \omega t \hat{i} + a \, \sin \, \omega t \, \hat{j}$, where $a$ and $\omega$ are real constants of suitable dimensions. The acceleration is

A rod of mass $m$ and length $l$ (is made to stand at an angle of $ {{60}^{o}} $ with the vertical. Potential energy of the rod in this position is

A ray of light is incident at $60^{\circ}$ on one face of a prism of angle $30^{\circ}$ and the emergent ray makes $30^\circ$ with the incident ray. The refractive index of the prism is

A particle is released from a height $ S $ . At certain height its kinetic energy is three times its potential energy. The height and speed of the particle at that instant are respectively

A copper disc of radius $ 0.1 \,m $ is rotated about its centre with $ 20\, rev/s $ in a uniform magnetic field of $ 0.1\, T $ with its plane perpendicular to the field. The emf induced across the radius of the disc is:

The magnifying power of objective of a compound microscope is 5. If the magnifying power of microscope is 30, then magnifying power of eyepiece will be

Under the action of a constant force, a particle is experiencing a constant acceleration. The power is

Displacement, $x$ (in meters), of a body of mass $1\,kg$ as a function of time, $t$, on a horizontal smooth surface is give as $x = 2t^2$. The work done in the first one second by the external force is

If the pressure and the volume of certain quantity of ideal gas are halved, then its temperature

In Young?s double slit experimental setup, if the wavelength alone is doubled, the band width $\beta$ becomes

A bullet when fired into a target loses half of its velocity after penetrating $20\, cm$. Further distance of penetration before it comes to rest is

An engine pumps water continuously through a hose. Water leaves the hose with a velocity $v$ and $m$ is the mass per unit length of the water jet. What is the rate at which kinetic energy is imparted to water?

A ball of mass $m$ is dropped from a height $h$ on a platform fixed at the top of a vertical spring, as shown in figure. The platform is depressed by a distance $x$. Then the spring constant is

The ratio of the intensities of two waves is 16 : 9. The ratio of their amplitudes is

When the temperature of a rod increases from t to t $+ \Delta t$ its moment of inertia increases from I to I + $\Delta I$ . If $\alpha$ be the coefficient of linear expansion of the rod, then the value of $\frac{\Delta I}{I}$ is

The $x-t$ plot shown in the figure below describes the motion of the particle, along $x-axis$, between two positions $A$ and $B$. The particle passes through two intermediate points $P_1$ and $P_2$ as shown in the figure

Two wires with currents $2\,A$ and $1\,A$ are enclosed in a circular loop. Another wire with current $3\, A$ is situated outside the loop as shown. Then $ \oint{\overrightarrow{B}}.\overrightarrow{dl} $ around the loop is

Two perfectly black spheres $A$ and $B$ having radii $8\,cm$ and $2\,cm$ are maintained at temperatures $127^{\circ}C$ and $527^{\circ}C$ respectively. The ratio of the energy radiated by $A$ to that by $B$ is

In frequency modulation

The magnetic flux linked with a coil of $N$ turns of area of cross section $A$ held with its plane parallel to the field $B$ is

Water is heated from $0^\circ\,C$ to $10\, ^\circ\,C$. then its volume