List of top Physics Questions asked in KEAM

If $r$ and $v$ represent, respectively, the orbital radius and orbital velocity of the electron in the Bohr's theory of hydrogen atom, then they are proportional to the orbit number as

If the energy of the incident radiation on a metal is increased by $10%$, the kinetic energy of the emitted photoelectrons increases from $0.5,eV$ to $0.75,eV$, then the work function of the metal is

If the de Broglie wavelengths of deuteron, positron and electron are in the ratio $1:2:3$, then the ratio of their respective momenta is

If the current in a coil of inductance $10,mH$ is increased from $1,A$ to $5,A$ in $0.2,s$, then the emf produced in it is

If a coin at the bottom of a lake appears to be at a depth of $6,m$, then the gauge pressure on the coin in pascal is ($\mu$ of water = $\frac{4}{3}$)

For a given ac supply voltage $60\sin\omega t$, the reactances offered by $L$ and $C$ are found to be $20,\Omega$ each. If the resistance of the resistor is also $20,\Omega$, then the current in the circuit is

In a plane electromagnetic wave if the amplitude of oscillating electric field is $45,Vm^{-1}$ then the amplitude of the oscillating magnetic field is

The shunt resistance to be connected across a galvanometer of resistance $50,\Omega$ to send $\dfrac{1}{1000}^{\text{th}}$ of the main circuit current through the galvanometer is nearly

If an object is placed at a distance of $12,cm$ from a thin lens of power $5D$, then the distance of the image from the lens with proper sign convention is

If the resistance of a uniform wire of length $1,m$ of cross-sectional area $0.1,m^2$ is $12,\Omega$, then the resistance of wire of length $2,m$ of the same material with area of cross section $0.2,m^2$ is

With increase in temperature, the resistivity of

If three cells each of emf $2,V$ and internal resistance $1,\Omega$ are connected to a resistor of $4.5,\Omega$ as shown, then the current through the resistor is

Two long straight conductors carrying equal current kept parallel at a separation of $d$ metre experience a force per unit length. If the distance of separation is made $2d$, then to maintain the same force per unit length on each conductor, the current in each conductor should be increased to

When a bar magnet of dipole moment $m$ is suspended in a uniform magnetic field $B$, then

Regarding the magnetic property, the TRUE statement is

The graph drawn between the velocity of sound in a gas and pressure of the gas at a given temperature is

The distance between the centres of two identical solid spheres each of radius 5 cm kept in free space is 40 cm. If each one is holding a charge of $2,\mu C$, then the work done in bringing their centres to a separation of 30 cm is

In a uniform electric field E, the work done in rotating the electric dipole of dipole moment P from $-45^{\circ}$ to $45^{\circ}$ with respect to the field direction is

Which one of the following motions is not simple harmonic motion?

The INCORRECT formula representing the energy stored in a parallel plate capacitor in usual notation is

A uniformly charged cube of side one cm having surface charge density of $8.85\ \mu C\text{ cm}^{-2}$ is placed inside a hollow metal sphere. The total flux emerging out of the sphere in $\text{Nm}^{2}\text{C}^{-1}$ is ($\epsilon_{0}=8.85\times 10^{-12}\text{C}^{2}\text{N}^{-1}\text{m}^{-2}$)

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

A cylinder contains 18 moles of oxygen at pressure of 15 atmosphere at temperature 300 K. If the pressure reduces to 9 atmospheres by the withdrawal of 6 moles of oxygen, then the temperature of the cylinder will be reduced to

If $f$ represents the intermolecular force between molecules and $V$ is the volume occupied by the gas molecules, then at high pressure and at low temperatures, the gas shows large deviation from the ideal behaviour because the fact that

If 300 J of heat energy is used to raise the temperature of one mole of an ideal gas by 10 K at constant pressure, then heat energy required to raise its temperature by 10 K at constant volume is $(R=8.3\text{ J mol}^{-1}\text{K}^{-1})$