List of top Questions asked in KEAM- 2016

The r.m.s. value of A.C. which when passed through a resistor produces heat, which is twice that produced by a steady current of $1.414$ A in the same resistor is

In a series LCR AC circuit, the current is maximum when the impedance is equal to

Pick out the wrong statement among the following

The wire of length $\ell$ is bent into a circular loop of a single turn and is suspended in a magnetic field of induction $B$. When a current $I$ is passed through the loop, the maximum torque experienced by it is

A particle having charge 10 times that of the electron revolves in a circular path of radius 0.4 m with an angular speed of one rotation per second. The magnetic induction produced at the centre of the circular path is

Two bulbs of equal power are connected in parallel and they totally consume 110 W at 220 V. The resistance of each bulb is

If a magnet is plunged into a coil, then the magnitude of induced emf does not depend upon

The amount of charge flowing per second per unit area normal to the flow is called

A galvanometer of resistance $G$ is converted into an ammeter using a shunt of resistance $R$. If the ratio of the heat dissipated through the galvanometer and shunt is $3:4$, then $R$ equals

An ammeter, voltmeter and a resistor are connected in series to a cell and the readings are noted as $I$ and $V$. If another resistor $R$ is connected in parallel with voltmeter, then

One gram of copper is deposited in a copper voltameter when a current of $0.5$ A flows for $30$ minutes. Then the current required to deposit $2$ g of silver in the same time is (ece of copper $= 3.3 \times 10^{-4}$ g C$^{-1}$, ece of silver $= 1.1 \times 10^{-3}$ g C$^{-1}$)

A conductor with a cavity is charged positively and its surface charge density is $\sigma$. If $E$ and $V$ represent electric field and potential, then inside the cavity

Electric lines of force about a positive point charge are

A cylinder of radius $r$ and length $\ell$ is placed in a uniform electric field $E$ parallel to its axis. The total flux over curved surface area is

The apparent change in frequency of sound due to the relative motion between the observer and the source of sound is called

Pick out the condition which is not required for the formation of stationary waves

The harmonic mode which resonates with a closed pipe of length 22 cm, when excited by a 1875 Hz source and the number of nodes present in it respectively are (velocity of sound in air = 330 m/s)

The electric field strength in \( \text{N C}^{-1} \) that is required to just prevent a water drop carrying a charge \( 1.6 \times 10^{-19} \) C from falling under gravity is (\( g = 9.8 \, \text{m s}^{-2} \), mass of water drop = \( 0.0016 \) g)

The force between two point charges placed in a material medium of dielectric constant $\varepsilon_r$ is $F$. If the material is removed, then the force between them becomes

If the average kinetic energy of a molecule of a hydrogen gas at 300 K is $E$, the average kinetic energy of a molecule of a nitrogen gas at the same temperature is

The difference between the specific heats of a gas is \( 4150 \, \text{J kg}^{-1}\text{K}^{-1} \). If the ratio of specific heats is \( 1.4 \), then the specific heat at constant volume of the gas (in \( \text{J kg}^{-1}\text{K}^{-1} \)) is

The time period of a simple pendulum of length \( \sqrt{5} \) m suspended in a car moving with uniform acceleration of \( 5 \, \text{m s}^{-2} \) in a horizontal straight road is (\( g = 10 \, \text{m s}^{-2} \))

Two equal masses hung from two massless springs of spring constants $k_1$ and $k_2$ have equal maximum velocity when executing SHM. The ratio of their amplitudes is

The simple harmonic motion of a particle is given by \( x = a \sin 2\pi t \). Then the location of the particle from its mean position at time \( \frac{1}{8} \) s is

The Carnot cycle of a reversible heat engine consists of