List of top Physics Questions asked in KEAM

The mean free path of moving gas molecules is expressed as $\lambda \propto n^x d^y$ where $n$ is the number of molecules per unit volume and $d$ is the size of the molecules. Then the values of $x$ and $y$ respectively, are

The root mean square velocity of a gas molecule is $100\text{ ms}^{-1}$. The mass of the molecule is increased four times keeping the temperature constant. Then, the root mean square velocity is

When a monoatomic gas at a pressure $P$ is suddenly compressed to $\frac{1}{8}$ of its original volume, the pressure of the gas becomes}

A carnot engine works between the temperatures $327^\circ\text{C}$ and $227^\circ\text{C}$. If the work output of the engine is $1\text{ kJ}$, then the amount of heat absorbed by the engine is

$\gamma_1$ is the ratio of the specific heat capacities of the rigid diatomic gas at constant pressure to that at constant volume and $\gamma_2$ is the corresponding value for a non-rigid diatomic gas molecule with an additional vibrational mode, then the ratio of $\gamma_1$ to $\gamma_2$ is

Bernoulli’s equation holds good for

Two copper wires have the lengths in the ratio $1 : 2$ and their radii are in the ratio $3 : 1$. If they are stretched by the same force, the ratio of the respective longitudinal strains in the two wires is

The escape velocities of two planets $A$ and $B$ are in the ratio $2 : 3$. If the ratio of their radii is $3 : 4$, then the ratio of acceleration due to gravity at the surface of the planet $A$ to that at the surface of the planet $B$ is

The height above the surface of the earth at which the acceleration due to gravity becomes $\frac{g}{9}$ in terms of radius of earth $R$ is ($g$ is acceleration due to gravity at the surface of the earth)}

The torque transmitted by an engine to a rotor in $100 \text{ Nm}$. If the power of the engine is $15 \text{ kW}$, the angular speed of the engine is

If the moment of inertia, rotational kinetic energy and angular momentum of a body are $I$, $E$ and $L$ respectively, then,

In an elastic collision,

The kinetic energy of a body of mass $5 \text{ kg}$ having a linear momentum $4 \text{ kg ms}^{-1}$ is

What will be the maximum speed of a car on a circular road of radius $12 \text{ m}$ if the coefficient of friction between the tyres and the road is $0.3$? $g = 10 \text{ms}^{-2}$}

The linear momentum of a particle as a function of time is given as $p = (3t^2 + 2t + 1)$ kgms$^{-1}$. Then, the force acting on the particle at $t = 3s$ will be}

A body is projected up with a velocity of $30 \text{ ms}^{-1}$ at an angle of $30^\circ$. The ratio of maximum height reached to the height reached in the first second is ($g = 10 \text{ms}^{-2}$)}

A vector is given as $\vec{A} = 3\hat{j} - 4\hat{k}$. The vector parallel to $\vec{A}$ and magnitude the same as that of the vector $\hat{i} - 2\hat{j}$ is

A car travels half the distance with a velocity of $20 \text{ kmh}^{-1}$ and another half distance with a velocity of $30 \text{ kmh}^{-1}$ along a straight road. The average velocity of the car in $\text{km h}^{-1}$ is

The number of significant figures in $50000.040 \times 10^{-3}$ is

The dimensions of Planck's constant are the same as those of

Choose the correct statement

Two light rays of wavelength \(\lambda\) and \(\frac{\lambda}{4}\) incident on the surface of a photo sensitive material emit electrons with max kinetic energy \(E\) and \(6E\) respectively. The work function of the material is (\(h\) = Planck’s constant, \(c\) = velocity of light in free space)

In the energy band diagram of solids, if the conduction band and the valance band overlap, the solid is

For the same kinetic energy, the de Broglie wavelengths associated with particles of different masses are

1600 atoms of a radioactive substance with a half life period \(T\) start decaying at \(t=0\). The time during which 1550 atoms would have decayed is