List of top Questions asked in KEAM

Potentiometer is an ideal instrument for measuring voltage because
When two capacitors of capacities $C_{1}$ and $C_{2}$ are connected in parallel, the equivalent capacitance is
The ratio of the electric force to the gravitational force between an electron and a proton separated by a distance r is approximately
The drift velocity of electrons in a conductor is of the order of
In a longitudinal wave, the distance between a compression and its adjacent rarefaction is
The speed of sound in air is $340~ms^{-1}$. The frequency of the fundamental note emitted by a pipe of length 2 m closed at one end is
A particle executing simple harmonic motion (SHM) has a maximum velocity of $1~ms^{-1}$ and a maximum acceleration of $2\pi~ms^{-2}$. Its time period of vibration is
The frequency of a simple pendulum is f. If its length is increased by four times, its frequency will become
The average kinetic energy of a gas molecule is
In an isothermal process, which of the following quantities remains constant?
The change in the value of acceleration due to gravity (g) at a height h above the surface of the earth is same as that at a depth d below the surface. If both h and d are much smaller than the radius of the earth (R), then
The coefficient of linear expansion of a solid depends on
Two bodies A and B of masses 80 g and 120 g move with same speed, $6~cm~s^{-1}$ in a plane. The speed of the centre of mass of the system is
The root mean square (rms) speed of the molecules of an ideal gas at a temperature T is proportional to
A satellite revolves around a planet in a circular orbit of radius R with the time period t. If the orbital radius is 3R, then its time period of revolution is
The position vector of a particle is given by $\vec{x}=(t^{3}-3t^{2}+2)\hat{i}$, the time at which the velocity of the moving particle becomes zero is
A block of mass 2 kg slides on a rough horizontal surface with initial speed $10~ms^{-1}$. The distance travelled by the block before it stops is ($g=10~ms^{-2}$, $\mu_{k}=0.2$)
A non-conservative force is one for which
A particle of mass m is initially at rest. A time varying force $F=kt$ acts on it. Its velocity after time t is
A flywheel in a steam engine ensures a smooth ride for the passengers on the vehicle because it has
A passenger of mass m stands on a weighing scale in an elevator accelerating upward with an acceleration of $g/2$. The scale would read ($g=$ acceleration due to gravity)
If the time period of oscillation of a liquid drop is given by $T=k\sqrt{\frac{\rho r^{4}}{\sigma}}$, where $\rho$ refers to its density, $r$ its radius and $k$ is a dimensionless constant, then $\sigma$ has the units of
If both x and y components of a vector are equal, its angle with x-axis is
The dimensional formula for the rate of change of momentum of a moving body is
The area under the velocity-time graph of a particle is equal to its