List of top Physics Questions asked in KEAM

The distance of an object placed in front of a concave mirror of radius of curvature 24 cm that gives its magnification as 3 is

If a rectangular loop carrying a current I and area ab is placed such that a uniform magnetic field B is in the plane of the loop, then the magnitude of torque on it is

If an electric bulb of resistance \(400 \Omega\) is connected to an ac source of peak voltage 282.8 V, then the electric power of the bulb is

The velocity of light in a medium of relative permittivity 2 and relative permeability 4.5 is (velocity of light in free space is c)

The diamagnetic and paramagnetic materials at 300 K are respectively,

The mismatched pair regarding the induced emf is

Three identical resistors are connected in the form of a triangular mesh ABC. If a battery of 12 V is connected across AB, then the ratio of the current flowing through AB to that through ACB is

If \(\tau\) is the average time between any two successive collisions for the electrons in a metal wire under the application of an electric field E, then the mobility \(\mu\) of the electrons is

The maximum current drawn from a battery of 12 V with internal resistance of \(0.5 \Omega\) is

According to Biot-Savart's law, the magnetic field B is

If the torque acting on an electric dipole when placed at an angle \(30^{\circ}\) with the direction of a uniform electric field is \(\tau\), then the torque acting on the same dipole when placed in the same field at an angle \(45^{\circ}\) is

Two identical isolated capacitors A and B are charged so that each has a charge of 4C. If a charge of \(-2C\) is added to A and \(+2C\) to B, then the ratio of respective potentials is

A conductor with an air core cavity inside, is charged to attain the surface charge density of \(\sigma\). If E is the magnitude of electric field and V is the potential, then inside the cavity

If a diode is forward biased, then the

The band gap energy of silicon is

In a plane electromagnetic wave, the magnetic field is given by \(B = 400 \times 10^{-6}\sin[(4.0 \times 10^{-4})(t - x/c)]\). The peak value of electric field (in V m\(^{-1}\)) is

A convex lens having power \(P\) is cut into two halves perpendicular to the principal axis. Then the power of each piece is

In Young’s double slit experiment performed in air medium, the fringe width observed is 1.4 mm. If the entire arrangement is kept in a liquid medium of refractive index 1.4, then the fringe width (in mm) will be

When a proton moves in a uniform magnetic field such that its velocity has a component along the direction of magnetic field, its trajectory will be a

An iron ring is held horizontally and a bar magnet is dropped gently through the ring with its length coinciding with the axis of the ring. The acceleration of the freely falling magnet (\(g\) = acceleration due to gravity) is

A wire of length 1.2 m carrying a current of 4 A, when placed in a uniform magnetic field 5 T experiences a force of 12 N. Then the angle between the direction of current and magnetic field is

Three capacitors each of capacitance \(12\,\mu F\), are connected in series. When this combination is connected to a battery of \(12\,V\), the charge drawn from the battery is

An electric cell does 10 J of work in carrying a charge of 5 C around a simple closed circuit. The electromotive force of the cell is

Pick out the INCORRECT statement

If the value of \(C_p/C_v\) is unity in the equation \(PV^\gamma = \text{constant}\), then the process is