List of top Questions asked in KEAM

The light emitting diode (LED) is
The inputs A, B and C to be given in order to get an output Y = 1 from the following circuit are
On an average, the number of neutrons and the energy of a neutron released per fission of a uranium atom are respectively
An electron of mass \(m_e\) and a proton of mass \(m_p\) are accelerated through the same potential. Then the ratio of their de Broglie wavelengths is
If the frequency of incident light falling on a photosensitive metal is doubled, the kinetic energy of the emitted photoelectron is
The significant result deduced from the Rutherford’s scattering experiment is that
The half-life of a radioactive substance is 20 minutes. The time taken between 50% decay and 87.5% decay of the substance will be
The ratio of the surface area of the nuclei \(_{52}\text{Te}^{125}\) to that of \(_{13}\text{Al}^{27}\) is
Identify the mismatch in the following
The apparent flattening of the sun at sunset and sunrise is due to
The polarising angle for a medium is found to be \( 60^\circ \). The critical angle of the medium is
Which one of the following is the property of a monochromatic, plane electromagnetic wave in free space?
Light of wavelength 5000 \r{A is incident normally on a slit of width $2.5 \times 10^{-4}$ cm. The angular position of second minimum from the central maximum is}
In Young's double slit experiment, to increase the fringe width
In an LCR series circuit, at resonance
In a plane electromagnetic wave, the electric field of amplitude \( 1 \text{ V m}^{-1} \) varies with time in free space. The average energy density of magnetic field is (in \( \text{Jm}^{-3} \))
A conducting ring of radius 1 m kept in a uniform magnetic field B of 0.01 T, rotates uniformly with an angular velocity 100 rad s\(^{-1}\) with its axis of rotation perpendicular to B. The maximum induced emf in it is
A step down transformer increases the input current 4 A to 24 A at the secondary. If the number of turns in the primary coil is 330, the number of turns in the secondary coil is
A bar magnet of moment of inertia \(9 \times 10^{-5} \text{ kg m}^2\) placed in a vibration magnetometer and oscillating in a uniform magnetic field \(16\pi^2 \times 10^{-5} \text{ T}\) makes 20 oscillations in 15 s. The magnetic moment of the bar magnet is
If a magnetic dipole of moment M situated in the direction of a magnetic field B is rotated by \(180^\circ\), then the amount of work done is
The polarity of induced emf is given by
If the radius of the dees of cyclotron is \(r\), then the kinetic energy of a proton of mass \(m\) accelerated by the cyclotron at an oscillating frequency \(\nu\) is
Identify the correctly matched pair
The magnitude of the magnetic field inside a long solenoid is increased by
If the ammeter A shows a zero reading in the circuit shown below, the value of resistance R is