List of top Physics Questions asked in KEAM

A tennis ball of mass 50g thrown vertically up at a speed of 25 m s$^{-1}$ reaches a maximum height of 25 m. The work done by the resistance forces on the ball is:

The kinetic energy of a body is increased by 21%. The percentage increase in its linear momentum is:

For a linear material, the relation between the relative magnetic permeability $ \mu_r $ and magnetic susceptibility $ \chi $ is:

The terminal potential difference of a cell in the open circuit is 2 V. When the cell is connected to a 10$\omega$ resistor, the terminal potential difference falls to 1.5 V. The internal resistance of the cell is:

If the voltage across a bulb rated 220V – 60W drops by 1.5% of its rated value, the percentage drop in the rated value of the power is:

A steady current of 2 A is flowing through a conducting wire. The number of electrons flowing per second in it is:

An electric dipole of dipole moment $ p $ is kept in a uniform electric field $ E $ such that it is aligned parallel to the field. The energy required to rotate it by 45° is:

A stationary body of mass 5 g carries a charge of 5 $\mu$C. The potential difference with which it should be accelerated to acquire a speed of 10 m/s is:

A thin spherical shell of radius 12 cm is charged such that the potential on its surface is 60 V. Then the potential at the centre of the sphere is:

The equation of a stationary wave is given by \[ y = 5 \sin \frac{\pi}{2} \cos 10\pi t \, {cm} \] The distance between two consecutive nodes (in cm) is:

A particle is executing linear simple harmonic oscillation with an amplitude of $ A $. If the total energy of oscillation is $ E $, then its kinetic energy at a distance of $ 0.707A $ from the mean position is:

The ratio between the root mean square velocities of $ O_2 $ and $ O_3 $ molecules at the same temperature is:

A monoatomic ideal gas of $ n $ moles heated from temperature $ T_1 $ to $ T_2 $ under two different conditions (i) at constant pressure, (ii) at constant volume. The change in internal energy of the gas is:

The rate of emission of a perfectly black body at temperature $ 27^\circ C $ is $ E_1 $. If the temperature of the body is raised to $ 627^\circ C $, its rate of emission becomes $ E_2 $. The ratio of $ \frac{E_1}{E_2} $ is:

The ends of a metallic rod are at temperatures $ T_1 $ and $ T_2 $, and the rate of flow of heat through it is $ Q \, {J s}^{-1} $. If all the dimensions of the rod are halved, keeping the end temperatures constant, the new rate of flow of heat will be:

A metal rod of length 1 m at 20°C is made up of a material of coefficient of linear expansion $ 2 \times 10^{-5} \, \text{°C}^{-1} $. The temperature at which its length is increased by 1 mm is:

A fluid has stream line flow through a horizontal pipe of variable cross-sectional area. Then:

If $ n $ small identical liquid drops, each having terminal velocity $ v $, merge together, then the terminal velocity of the bigger drop is:

The slope of the graph plotted between the square of the time period of a planet $ T^2 $ and the cube of its mean distance from the sun $ r^3 $ is:

The value of escape velocity $ v_e $ for a planet depends on:

Radius of gyration $ K $ of a hollow cylinder of mass $ M $ and radius $ R $ about its long axis of symmetry is:

The torque required to increase the angular speed of a uniform solid disc of mass 10 kg and diameter 0.5 m from zero to 120 rotations per minute in 5 sec is:

In moving a body of mass $ m $ down a smooth incline of inclination $ \theta $ with velocity $ v $, the power required is (g = acceleration due to gravity):

When a vehicle moving with kinetic energy $ K $ is stopped in a distance $ d $ by applying a stopping force $ F $, the relation between $ F $ and $ K $ is given by:

A machine gun fires a bullet of mass 25 g with a velocity of 1000 ms$^{-1}$. If the man holding the gun can exert a maximum force of 100 N on the gun, the maximum number of bullets that he can fire per second is: