List of top Physics Questions

Two identical balls A and B collide head on elastically. If the velocity of A and B before collision are $0.5\, ms^{-1}$ and 0.3 $ms^{-1}$ respectively, then their velocities after collision will be
Two identical coaxial coils $P$ and $Q$ carrying equal amount of current in the same direction are brought nearer. The current in
Two conducting spheres $A$ and $B$ of radius $a$ and $b$ respectively are at the same potential. The ratio of the surface charge densities of $A$ and $B$ is
The Zeroth law of thermodynamics leads to the concept of
The work done by a force F = ($-6x^3 $)i N, in displacing a particle from x = 4 m to x = - 2 m is
The Work-Energy theorem states that the change in
The ratio of inertial force to viscous force of a fluid is called
The position of final image formed by the given lens combination from the third lens will be at a distance of [ $ {{f}_{1}}=+10\text{ }cm, $ $ {{f}_{2}}=-10cm, $ $ {{f}_{3}}=+30\text{ }cm $ ]
The potential energy of a conservative system is given by $V(x) = (x^2 - 3x)$ joule. Then its equilibrium position is at
The polarising angle for a medium is found to be $60^{\circ}$. The critical angle of the medium is
The one which does not represent a force in any context is
The optical fibres have an inner core of refractive index $ {{n}_{1}} $ and a cladding of refractive index $ {{n}_{2}}, $ such that
The moment of inertia of the rectangular plate ABCD, (AB = 2 BC) is minimum along the axis
The mobile telephones operate typically in the range of
The light emitting diode $(LED)$ is
The least distance of distinct vision of a person is $75\, cm$. The focal length of the reading spectacles for such a person should be
The instantaneous voltage through a device of impedance 20 $\Omega$ is e = 80 \,sin \,100 $ \pi t$. The effective value of the current is
The electric field due to an infinitely long straight uniformly charged wire at a distance $r$ is directly proportional to
The dimensions of kinetic energy is:
The dimension of mutual inductance is (Denote dimension of current as A)
The dielectric constant of air is $ 1.006 $ . The speed of electromagnetic wave travelling in air is $ a\times {{10}^{8}}m{{s}^{-1}}, $ where a is about
Three moles of an ideal gas are in a rigid cubical box with sides of length $0.170 \,m$. The ratio of the forces that the gas exerts on each of the six sides of the box when the gas temperature are $27^{\circ}C$ and $127^{\circ}C$ is,
The depletion layer of a $ p-n $ junction:
If a monoatomic gas is compressed adiabatically to $(1/27)$th of its initial volume, then its pressure becomes
The de-Broglie wavelength and kinetic energy of a particle is $2000 \,?$ and $1\, eV$ respectively. If its kinetic energy becomes $1\, MeV$, then its de Broglie wavelength