List of top Physics Questions

Hydrogen atom in ground state is excited by a monochromatic radiation of λ = 975 \(\mathring{A}\). Number of spectral lines in the resulting spectrum emitted will be:
The force F acting on a particle of mass m is indicated by the force-time graph shown below. The change in momentum of the particle over the time interval from zero to 8s is
The force F acting on a particle of mass m
In the Young's double- slit experiment, the intensity of light at a point on the screen where the path difference is λ is K, (λ being the wave length of light used). The intensity at a point where the path difference is \(\frac{λ}{4}\), will be:
If the kinetic energy of the particle is increased to 16 times its previous value, the percentage change in the de-Broglie wavelength of the particle is :
If force (F), velocity (V) and time (T) are taken as fundamental units, then the dimensions of mass are:
The Binding energy per nucleon of \(^7_3Li\) and \(^4_2He\) nuclei are 5.60 MeV and 7.06 MeV, respectively. In the nuclear reaction \(^7_3Li + ^1_1H \rightarrow ^4_2He + ^4_2He+Q\), the value of energy Q released is:
The barrier potential of a p-n junction depends on:
(a) type of semi conductor material
(b) amount of doping
(c) temperature
Which one of the following is correct?
The angle of a prism is 'A'. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface returns back through the same path after suffering reflection at the silvered surface. The refractive indexµ, of the prism is
Dependence of intensity of gravitational field (E) of earth with distance (r) from centre of earth is correctly represented by
If the focal length of objective lens is increased then magnifying power of:
A thin semicircular conducting ring (PQR) of radius 'r' is falling with its plane vertical in a horizontal magnetic field B, as shown in figure. The potential difference developed across the ring when its speed is v, is:
A thin semicircular conducting ring (PQR) of radius 'r'
In an ammeter 0.2% of main current passes through the galvanometer. If resistance of galvanometer is G, the resistance of ammeter will be:
A steady current flows in a long wire. It is bent into a circular loop of one turn and the magnetic field at the centre of the coil is $ B $ . If the same wire is bent into a circular loop of $ n $ turns, the magnetic field at the centre of the coil is
Two concentric hollow spherical shells have radii $ r $ and $ R \left(R\,>>\,r\right) $ . A charge $ Q $ is distributed on them such that the surface charge densities are equal. The electric potential at the centre is
A balloon with mass m is descending down with an acceleration a (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration $a$?
A stone of mass $0.05 \,kg$ is thrown vertically upwards. What is the direction and magnitude of net force on the stone during its upward motion ?
When longitudinal wave propagates, what happens in the region of compressions and rarefactions?
Period of geostationary satellite is
The equivalent resistance of two resistors connected in series is $6\, \Omega$ and their parallel equivalent resistance is $\frac{4}{3} \Omega$. What are the values of resistances ?
One second is defined as
Einstein was awarded Nobel prize for his work in
On an average, a human heart is found to beat $72$ times a minute. Its frequency and period are
A proton and helium nucleus are shot into a magnetic field at right angles to the field with same kinetic energy. Then the ratio of their radii is
Which one of the following represents uniform motion ?
An aeroplane is flying horizontally with a velocity of $360\, km\, h^{-1}$. The distance between the tips of the wings of the aeroplane is $50\, m$. The vertical component of the earth's magnetic field is $4 \times 10^{-4} \, Wb \, m^{-2}$. The induced e.m.f. is