List of top Physics Questions asked in KEAM

A parallel plate capacitor with a dielectric medium of dielectric constant 1.5 has a capacitance of $C$. If the dielectric is removed, then the capacitance of the capacitor becomes

The energy stored in a soap bubble of diameter 4 cm is nearly (surface tension of soap solution is 0.07 N/m)

A man loses 50% of his velocity after running a distance of 100 m. If his retardation is uniform, the distance he will cover before coming to rest is

An alternating current having peak value 14.14 A is used to heat a metal wire. The value of the direct current $i$ required to produce the same heating effect in the same wire is

Half-life of radon is 3.5 days. The amount of radon left out of 12 mg mass undecayed after 35 days is nearly

In a nuclear decay, after the emission of one $\alpha$-particle and one $\beta$-particle

When a spring of spring constant $k$ is cut into two pieces whose lengths are $l_1$ and $l_2$, then the ratio of their spring constants $k_1$ and $k_2$ is

A block of mass $M$ moves with a velocity $v$ along a frictionless horizontal surface towards another block of mass $2M$ at rest. The velocity of the center of mass of the system of blocks is

When two different liquids of same mass but at two different temperatures $27^\circ C$ and $47^\circ C$ are mixed together, the resulting temperature of the mixture is $35^\circ C$. The ratio of their specific heat capacities is

The correct order of arrangement of electromagnetic waves according to their wavelengths is

If $P$ is the pressure at which the heart is pumping the blood and the volume of blood pumped per second is $V$, then the power of the heart is given by

Two perfectly black bodies are at temperatures $ T $ and $ 2T $. The ratio between the wavelengths corresponding to maximum energy emission by the two black bodies is

When a glass rod is rubbed with silk thread, it loses 1000 electrons. Then the charge on the glass rod is (electronic charge $e = 1.6 \times 10^{-19}$ C)

A projectile is given an initial velocity of $(\hat{i} + \hat{j})$ m/s, where $\hat{i}$ is along the ground and $\hat{j}$ is along the vertical direction. The equation of its trajectory is $(g = 10 \, \text{m/s}^2)$.

Which of the following has the maximum Young’s modulus value?

In a p-n junction diode, reverse biasing

Which one of the following is not a semiconductor?

When two spheres of radii $r$ and $\frac{r}{2}$ are brought in contact, the gravitational force of attraction between them is proportional to

For a smoothly running analog clock, the angular velocity of its second hand in rad s$^{-1}$ is:

For a given radioactive material of mean life $\tau$ and half-life $t_{1/2}$, the relationship between $t_{1/2}$ and $\tau$ is:

A charged particle will continue to move in the same direction in a region, where $E$ - Electric field, $B$ - Magnetic field:

Two similar metallic rods of the same length $ l $ and area of cross section $ A $ are joined and maintained at temperatures $ T_1 $ and $ T_2 $ ($ T_1>T_2 $) at one of their ends as shown in the figure. If their thermal conductivities are $ K $ and $ \frac{K}{2} $ respectively. The temperature at the joining point in the steady state is:

When an $ \alpha $ particle and a proton are projected into a perpendicular uniform magnetic field, they describe circular paths of the same radius. The ratio of their respective velocities is:

The kinetic energy of 3 moles of a diatomic gas molecules in a container at a temperature $ T $ is same as that of kinetic energy of $ n $ moles of monoatomic gas molecules in another container at the same temperature $ T $. The value of $ n $ is:

According to equipartition principle, the energy contributed by each translational degree of freedom and rotational degree of freedom at a temperature T are respectively ($ k_B = \text{Boltzmann constant} $):