List of top Questions asked in KEAM

The I-V characteristic of a semiconductor diode in forward bias is a/an:

\( 75\% \) of \( ^{234}_{90}\text{Th} \) decays in \( t \) years. Its half-life is (in years):

Light of wavelength \(\frac{36}{5R}\,\text{m}\) is emitted by a hydrogen atom during the transition of electrons from the state

The ratio between the wavelengths of the air column vibrating in the first two modes in an open organ pipe is

Above the threshold frequency, if the intensity of incident light falling on a photo sensitive material is increased, then the correct statement is:

Plane polarized light can be produced by the phenomenon of

At the lowest point of the plot of angle of deviation versus the angle of incidence of a triangular prism, the angle of incidence is equal to

If two waves of equal amplitude \( A \) and opposite phase interfere, the amplitude of the resultant wave is

The transverse nature of electromagnetic waves is confirmed by the phenomenon of

A \(1\) kW bulb radiates light uniformly in all directions. The intensity at a point on the surface of the surrounding sphere of area \(200\,\text{m}^2\) is (in \(\text{W m}^{-2}\))

The power required to push the arm of a rectangular conductor with a constant speed \(v\) in a motor is directly proportional to

In synchrotron, the required high magnetic fields are generated by

For a circular coil carrying current, the thumb in the right hand thumb rule gives the direction of

Gyromagnetic ratio of an electron is the ratio between

The resistivity of a metallic wire is directly proportional to (T – temperature; \( \tau \) average time of collisions of free electrons; \( n \) – number of free electrons per unit volume; \( A \) – area of cross-section)

Mobility is the drift velocity per unit

The rms value of a.c with peak value of \(200\) V is

The magnitude of the torque experienced by an electric dipole of dipole moment \(P\) placed at an angle of \(30^\circ\) in a uniform electric field \(E\) is

If the work done in moving a charge of \( 3\,C \) from A to B is \( 12\,J \), then the potential difference between A and B is

Force between two charges \( +8\,\mu C \) and \( +2\,\mu C \) is \( 16\,N \). If the charges are brought into contact and then separated by the same distance, the force between them is

If the speed of transverse waves on a stretched wire of linear density \(7\times 10^{-3}\,\text{kg m}^{-1}\) is \(100\,\text{m s}^{-1}\), then the tension in the wire is

For smaller angular displacement, the period of a simple pendulum depends on

If \(T\) and \(\rho\) represent the temperature and density of a gas, then the velocity of sound in the gas is directly proportional to

If the mean kinetic energy of one mole of helium gas at \( 400\,K \) temperature is \( 5000\,J \), then that for one mole of neon gas at \( 800\,K \) is

For an ideal gas at temperature \( T \) having the total number of molecules \( N \), the product of the pressure and volume, \( PV \), is equal to \((k_B \text{ is the Boltzmann constant})\)