List of top Physics Questions

A real gas behaves as an ideal gas,
A piece of brass (alloy of copper and zinc) weighs 12.9 g in air. When completely immersed in water it weighs 11.3 g. What is the mass of copper contained in the alloy ? (Specific gravities of copper and zinc are 8.9 and 7.1 respectively)
A particle is moving on a circular path of 10 m radius. At any instant of time, its speed is ${5\, m \, s^{-1}}$ and the speed is increasing at a rate of ${2\, m \, s^{-2}}$. The magnitude of net acceleration at this instant is
A galvanometer can be converted into a voltmeter by connecting a
A closed organ pipe and an open organ pipe of same length produce $2 \,beats/second$ when they are set into vibrations together in fundamental mode. The length of open pipe is now halved and that of closed pipe is doubled. The number of beats produced will be
A circular coil of $n$ turns and radius $R$ has a magnetic induction of strength at its centre is
A ball of mass $m$ moving with a constant velocity $u$ strikes against a ball of same mass at rest. If $e$ = coefficient of restitution, then what will be the ratio of velocity of two balls after collision ?
An object is kept on a smooth inclined plane of $1 $ in $ l. $ The horizontal acceleration to be imparted to the inclined plane so that the object is stationary relative to incline is
Rydberg constant is
An electromagnetic wave transfers
Which of the following wave can?t travel in vacuum?
What is the name given to that part of the electromagnetic spectrum which is used for taking photographs of earth under foggy conditions from great heights?
A soap bubble exhibits brilliants colours due to
The gas cause Green House Effect is
The average degree of freedom per molecule for a gas is $6$. The gas performs $25\,J$ of work when it expands at constant pressure. The heat absorbed by the gas is
The maximum kinetic energy of the photoelectrons depends only on
The average power dissipated in $A.C.$ circuit is $2$ watt. If a current flowing through a circuit is $2\, A$ and impedance is $1\, \Omega$, what is the power factor of the AC circuit ?
An object is placed at $20\,cm$ in front of a concave mirror produces three times magnified real image. What is focal length of the concave mirror ?
When the energy of the incident radiation is increased by $20 \%, $ the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV. The work function of the metal is
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 solid cylinder of mass 50 kg and radius 0.5 m is free to rotate about the horizontal axis . A massless string is wound round the cylinder with one end attached to it and other hanging freely. Tension in the string required to produce an angular acceleration of 2 revolutions $ s^ {-2} $ is
A body of mass $(4m)$ is lying in $x-y$ plane at rest. It suddenly explodes into three pieces. Two pieces, each of mass $(m)$ move perpendicular to each other with equal speeds $(v)$. The total kinetic energy generated due to explosion is
If the temperature of the body is increased by $ 10\%, $ the percentage increase in the emitted indication will be
A charge Q is uniformly distributed over a long rod AB of length L as shown in the figure. The electric potential at the point O lying at distance L from the end A is
A uniform electric field $\overrightarrow{E}$ exists between the plates of a charged condenser. A charged particle enters the space between the plates and perpendicular to $\overrightarrow{E}$. The path of the particle between the plates is a :