List of top Physics Questions

The focal length of a plane mirror is
The phenomenon of total internal reflection occurs when a ray of light travels from
In a hydrogen atom, the radius of the $n^{th}$ Bohr orbit is proportional to
The de Broglie wavelength of a particle of mass m and kinetic energy E is given by
The binding energy per nucleon is maximum for the nucleus
In Young's double slit experiment, if the distance between the slits is halved and the distance between the slits and the screen is doubled, the fringe width will become
A convex lens of focal length 20 cm is placed in contact with a concave lens of focal length 40 cm. The power of the combination is
The sensitivity of a moving coil galvanometer can be increased by
The electromagnetic waves used in radar systems for aircraft navigation are
In an AC circuit containing only a capacitor, the current
The core of a transformer is laminated to reduce
A dip needle vibrates in a vertical plane perpendicular to the magnetic meridian. The time period of vibration is
The electric potential at a point on the axis of an electric dipole at a distance r from its centre is proportional to
The magnetic field at the centre of a circular current carrying coil of radius R is B. The magnetic field at a distance R from the centre on the axis of the coil is
Potentiometer is an ideal instrument for measuring voltage because
A wire of resistance R is stretched to double its length. Its new resistance will be
When two capacitors of capacities $C_{1}$ and $C_{2}$ are connected in parallel, the equivalent capacitance is
The ratio of the electric force to the gravitational force between an electron and a proton separated by a distance r is approximately
The drift velocity of electrons in a conductor is of the order of
The frequency of a simple pendulum is f. If its length is increased by four times, its frequency will become
A particle executing simple harmonic motion (SHM) has a maximum velocity of $1~ms^{-1}$ and a maximum acceleration of $2\pi~ms^{-2}$. Its time period of vibration is
In a longitudinal wave, the distance between a compression and its adjacent rarefaction is
The speed of sound in air is $340~ms^{-1}$. The frequency of the fundamental note emitted by a pipe of length 2 m closed at one end is
The average kinetic energy of a gas molecule is
Two bodies A and B of masses 80 g and 120 g move with same speed, $6~cm~s^{-1}$ in a plane. The speed of the centre of mass of the system is