List of top Physics Questions asked in KEAM

In the magnetic meridian of a certain plane,the horizontal component of earth's magnetic field is 0.36 Gauss and the dip angle is 60°. The magnetic field of the earth at location is: 

An ideal gas is compressed in volume by a factor of 2,while keeping its temperature constant. The speed of sound in it is: 
A metallic cylindrical wire 'A' has length 10 cm and radius 3 mm. Another hollow cylindrical wire 'B' of the same metal has length 10 cm, inner radius 3 mm and outer radius 4 mm. The ratio of the resistance of the wires A to B is: 

A current-carrying long solenoid is formed by winding 200 turns per cm. If the number of turns per cm is increased to 201, keeping the current constant, then the magnetic field inside the solenoid will change by:

An inductor coil with an internal resistance of 50 Ω stores magnetic field energy 180 mJ and dissipates energy as heat at the rate of 200 W when a constant current 9 passed through it. The inductance of the coil will be:
In a current carrying coil of inductance 60 mH,the current is changed from 2.5 A in one direction to 2.5 A in the opposite direction in 0.10 sec. The average induced EMF in the coil will be:
A man weighing 70 kg is riding on a cart of mass 30 kg which moves along a level floor at a speed of 3 ms-1. If he runs on the cart so that his velocity relative to the cart is 4ms-1 in the direction opposite to the motion of the cart, the speed of centre of mass of the system is
Given below are the velocity-time graph of five particles, A, B, C, D and E. The correct graph from the following v-t plot in which the velocity if the particle is a function of t2 is
A tuning fork produces 4 beats per second with both 26.0 cm and 25.2 cm of stretched sonometer wire. Frequency of the fork is
In communication systems, the device used to convert energy from one form to another form is
The minimum length of the dipole antenna for a carrier wave frequency of 200 MHz is nearly
Logic gates are given the inputs A = 0 and B = 1 in case (a) and A = 1 and B = 0 in case (b). The gates giving output of y=1 for both the cases are
When light falls on a solar cell, the generation of emf happens due to
If the potential at A is greater than the potential at B, then the equivalent resistance of the circuit across AB is
If the potential at A is greater than the potential at B
The special purpose diode operated / working under forward bias is / are
In a nuclear reactor, the ratio of number of fission produced by a given generation of neutrons to the number of fission of the preceding generation is known as
In Bohr atom model, the total energy of the electron in hydrogen atom is -3.4eV. Then its angular momentum about the nucleus of the atom is (h=Planck's constant)
The INCORRECT statement is
The energy equivalent of 5 g of a substance is
The material that is not photo sensitive to visible light is
The momenta of a proton, a neutron and an electron are in the ratio 3:2:1, then their respective de Broglie wavelengths are in the ratio
Two rays of light A and B are falling on a glass slab at the angles of incidence 45° and 60°. if the reflected ray of A is partially polarized and that of B is completely polarized, then the refractive index of glass is
If the Young's double slit experimental set up is immersed in a liquid of refractive index μ, the fringe width of the interference pattern observed is β. When the experiment is performed in air medium with the same experimental set up, the fringe width of the pattern will be
A plane wave front is incident on a thin prism, thin convex lens and a concave mirror separately. The wave front(s) emerging out from the
The INCORRECT statement is