List of top Physics Questions asked in KEAM

To increase the efficiency of a Carnot engine working between a source at 500 K and a sink at 300 K by 10%, with the same sink temperature the source temperature should be increased to
The flow of oil of density $800\text{ kgm}^{-3}$ through a horizontal pipe is streamlined. If the pressure between two points separated by 1m in the tube falls by $1.6\text{ Nm}^{-2}$, then the change in kinetic energy per kg of the liquid between these points is
The height at which the weight of a body becomes one third of its weight on the surface of earth is (R is the radius of earth)
If the work done in increasing the area of a thin soap film from $A$ to $3A$ is $W$, then the surface tension of the soap solution is
If the ratio of the distances of a planet from the sun at perihelion and aphelion is 2: 3, then the ratio of their respective velocities at the perihelion and aphelion is
A solid cylinder of mass 6 kg of length $l$ is inserted tightly into a hollow cylinder of outer radius 0.6 m and length $l$ without any air gap between them. If the moment of inertia of this setup about its own axis is $1.44\text{ kgm}^{2}$, then the mass of the hollow cylinder is
The objects and the corresponding positions of centre of mass are given below. The FALSE one is
A bob of mass m tied to one end of a light string of length 50 cm whirled in a vertical circle. The minimum velocity with which it has to move so that the string remains taut, when it reaches the top most point of the circle is $(g=10\text{ ms}^{-2})$
The power generated by a turbine operated by the fall of water from a height of 100 m at the rate of $24\text{ kg s}^{-1}$ is 21 kW. The percentage loss in power is
If the area under the graph between the force on an object and time is 20 units, then the object experiences
A hanging rope can withstand a tension of 750 N. The minimum acceleration for a man of 50 kg to climb up without breaking the rope is $(g=10\text{ ms}^{-2})$
If the vectors $\vec{A}=a_{x}\hat{i}+a_{y}\hat{j}+a_{z}\hat{k}, \vec{B}=b_{x}\hat{i}+b_{y}\hat{j}+b_{z}\hat{k}$ and $\vec{C}=c_{x}\hat{i}+c_{y}\hat{j}+c_{z}\hat{k}$ are defining the vector $\vec{T}=\vec{A}-\vec{B}+\vec{C}$ then the z-component of the vector $T_{z}$ is
If a ball is thrown horizontally with a velocity of $10\text{ ms}^{-1}$ from the tower of height 45 m, then it strikes the ground at a distance of $(g=10\text{ ms}^{-2})$
The mismatch between the physical quantity and the dimensional formula in the following is
A particle moves along a semi circular path of radius $r$ in time $t$ with constant speed, then its
Of the given numbers,
(1) 25300
(2) 5.600
(3) 0.07200
the number of significant figures for
Heat supplied to a block of ice at \(0^{\circ}C\) converts it into steam at \(100^{\circ}C\). The curve that represents this change of state is.
If the voltage applied to a diode having forward bias resistance of 1 $\Omega$ is changed from 0.6 V to 0.9 V, the change in current in it is
The expected mass of \({}^{12}_{6}C\) nucleus is (Mass of neutron is 1.00866 u; Mass of proton is 1.00727 u).
5 thin lenses each of 20 cm focal length are placed in contact with each other. The net power of this lens combination is
In a cyclotron, the frequency of revolution of a charged particle of energy E moving in a magnetic field is f. If the energy of the charged particle in it is doubled, then the frequency of revolution of the charged particle is
In Young's double slit experiment, monochromatic light of 500 nm falls on the slits separated by a distance of 2 mm. If the screen is 2 m away from the source, then the fringe width is
If the force due to sun's radiation on surface area of \(cm^{2}\) is about \(9 \times 10^{-9} N\), then the radiation pressure of the sun's radiation (in \(Nm^{-2}\)) is.
If an emf of 2 V is induced in a coil in 6 s, then the change of flux (in Wb) in the coil during the time is
Among the following magnetic materials, the diamagnetic material is