List of top Physics Questions on Acceleration due to gravity of the earth asked in KEAM

n number of electrons flowing in a copper wire for 1 minute constitute a current of 0.5 A. Twice the number of electrons flowing through the same wire for 20 s will constitute a current of:
If a cell of 12 V emf delivers 2 A current in a circuit having a resistance of 5.8 \(\Omega\), then the internal resistance of the cell is:
Which one of the following statement is INCORRECT?
When a current passing through a coil changes at a rate of 30 A s\(^{-1}\), the emf induced in the coil is 12 V. If the current passing through this coil changes at a rate of 20 A s\(^{-1}\), the emf induced in this coil is:
If the total momentum delivered to a surface by an EM wave is \(3 \times 10^{-4}\) kg m/s, then the total energy transferred to this surface is:
When two coherent sources each of individual intensity \( I_0 \) interfere, the resultant intensity due to constructive and destructive interference are respectively
If the power of a lens is +4 D, then the lens is a
A particle having mass 2000 times that of an electron travels with a velocity thrice that of the electron. The ratio of the de Broglie wavelength of the particle to that of the electron is
The process by which the electrons can come out of the metal in a spark plug is:
The energy required to excite the hydrogen atom from its first excited state to second excited state is:
In gamma emission, the nucleus emits
If the initial decay rate of a radioactive sample is \( R_0 \), then the decay rate after a half-life time \( T_{1/2} \) is
If the conductivity of the material lies in the range \(10^2 - 10^8 \, \Omega^{-1}m^{-1}\), then it is a
The thickness of the depletion layer on either side of the p-n junction is of the order of
In a Carnot engine, the temperature of the sink is 350 K. If the efficiency of the engine is 50%, the temperature of the source should be:
The electric field intensity due to an ideal dipole at a distance \( r \) from its center on the axial point is directly proportional to:
If the power of a lens is -2.0 D, then the type and focal length \( f \) of the lens are:
If the earth shrinks to half of its present size and its mass reduces to half of its actual mass, then the acceleration due to gravity(g) on its surface will be