List of top Physics Questions

The $SI$ unit of pressure gradient is
The SI unit of magnetic permeability is
The shortest wavelength of the Brackett series of a hydrogen like atom (atomic number =Z) is the same as the shortest wavelength of the Balmar series of hydrogen atom. The value of Z is
The shortest wavelength in the Balmer series is $(R = 1.097 \times 10^7 \,m^{-1})$
The self inductance $L$ of a solenoid of length $l$ and area of cross-section $A$, with a fixed number of turns $N$ increases as
The self inductance of an inductor coil having $100$ turns is $20\, mH$. The magnetic flux through the cross-section of the coil corresponding to a current of $4 \,mA$ is
The satellite of mass m revolving in a circular orbit of radius r around the earth has kinetic energy E. Then its angular momentum will be
The root mean square velocity, $v_{rms}$ , the average velocity $v_{av}$ and the most probable velocity,$v_{mp}$ of the molecules of the gas are in the order:
The root mean square speed of gas molecules
The role of inductance is equivalent to :
The refractive index of glass with respect to air is 1.6. The refractive index of air w.r.t glass is:
The refractive index of glass is $1.5$ for light waves of $\lambda = 6000 \,?$ in vacuum. Its wavelength in glass is
The ratio of the speed of the electron in the ground state of hydrogen atom to the speed of light in vacuum is
The ratio of one micron to one nanometre is
The ratio of shearing stress to the shearing strain is defined as
The ratio of intensity at the centre of a bright fringe to the intensity at a point distant one fourth of the distance between two successive bright fringes will be
The ratio of magnitude of electrostatic force and gravitational force for an electron and a proton is
The ratio of lateral strain to the longitudinal strain of wire is called :
The ratio of diameters of two wires of same V material is n : 1 The length of each wire is 4m. on applying the same load, the increasing length of thin wire will be(n > 1)
The ratio of earth?? orbital angular momentum (about the sun) to.its mass is $4.4 \times 10^{15}\, m^2/s$. The area enclosed by earths orbit approximately is (in $m^2$)
The rating of fuse wire is expressed in terms of :
The r.m.s. velocity of oxygen molecule at $16^{\circ} C$ is 474 m/sec. The r.m.s. velocity in m/s of hydrogen molecule at $127^{\circ } C$ is
The radius of curvature of a thin planoconvex lens is 10 cm and the refractive index is 1.5. If the plane surface is silvered then it behaves like a concave mirror of focal length
The propagation constant of a wave is also called its
The probability of safe arrival of one ship out of five is $\left(\frac{1}{5} \right)$ . The probability of safe arrival of atleast 3 ship is: