List of top Physics Questions

A radio transmitter operates at a frequency 880 kHz and a power of 10 kW. The number of photons emitted per second is
A $600\, kg$ rocket is set for a vertical fring. If the exhaust speed is $1000 \,ms^{-1}$ the mass of the gas ejected per second to supply the thrust needed to overcome the weight of rocket is
Velocity of sound waves in air is 330 m/s. For a particular sound wave in air, a path difference of 40 cm is equivalent to phase difference of $1.6\, \pi$. The frequency of this wave
In which of the following, emission of electrons does not take place
The composition of two simple harmonic motions of equal periods at right angle to each other and with a phase difference of $\pi$ results in the displacement of the particle along
The magnetic induction at a point P which is at the distance of 4 cm from a long current carrying wire is $ 10^{-3}$ T. The field of induction at a distance 12 cm from the current will be
In the network shown in figure each resistance is $1\, \Omega.$ The effective resistance between A and B is
How much water a pump of 2 kW can raise in one minute to a height of 10 m? (take g = 10 m/s$^2$)
You are given several identical resistances each of value $R=10\, \Omega$ and each capable of carrying a maximum current of one ampere. It is required to make a suitable combination of these resistances of $5\, \Omega$ which can carry a current of 4 ampere. The minimum number of resistances of the type R that will be required for this job is
A mass m is suspended from the two coupled springs connected in series. The force constant for springs are $ k_1 $ and $ k_2$. The time period of the suspended mass will be
An object is dropped from rest, its velocity V changes in the following forms
Absolute zero of temperature is
Moment of inertia of a uniform circular disc about a diameter is I. Its moment of inertia about an axis perpendicular to its plane and passing through a point on its rim will be
When an ideal diatomic gas is heated at constant pressure the fraction of the heat energy supplied which increases the internal energy of the gas is
A uniform cylinder of length L and mass M having cross-sectional area A is suspended, with its length vertical, from a fixed point by a massless spring, such that it is half-submerged in a liquid of density p at equilibrium position. When the cylinder is given a small downward push and released it starts oscillating vertically with a small amplitude. If the force constant of the spring is k, the frequency of oscillation of the cylinder is
The frequency of vibration $f$ of a mass $m$ suspended from a spring of spring constant $k$ is given by a relation $f = am^x k^y$, where $a$ is a dimensionless constant. The values of $x$ and $y$ are
A thin prism $P_1$ with angle $4^\circ$ and made from glass of refractive index 1.54 is combined with another thin prism $P_2$ made from glass of refractive index 1.72 to produce dispersion without deviation. The angle of the prism $P_2$ is
A wave is represented by the equation ; $\, \, \, \, \, y=A \sin (10 \pi x+15 \pi l+ \pi /3) $ where, x is in metre and t is in second. The expression represents
A planet is moving in an elliptical orbit around the sun. If T, V, E and L stand respectively for its kinetic energy, gravitational potential energy, total energy and magnitude of angular momentum about the centre of force, which of the following is correct ?
A bullet of mass 10 g leaves a rifle at an initial velocity of 1000 m/s and strikes the earth at the same level with a velocity of 500 m/s. The work done in joule overcoming the resistance of air will be
An astronomical telescope has an angular magnification of magnitude 5 for far objects. The separation between the objective and the eyepiece is 36 cm and the final image is formed at infinity. The focal length $f_o$ of the objective and the focal length $f_e$ of the eyepiece are
The atomic number of silicon is 14. Its ground state electron configuration is
A conducting square loop of side L and resistance R moves in its plane with a uniform velocity v perpendicular to one of its sides. A magnetic induction B, constant in time and space, pointing perpendicular to and into the plane of the loop exists everywhere.The current induced in the loop is
What will be the ratio of the distance moved by a freely falling body from rest in $4^{th}$ and $5^{th}$ seconds of journey ?
A current of 2 A, passing through a conductor produces 80 J of heat in 10 seconds. The resistance of the conductor in ohm is