List of top Physics Questions

A diminished, virtual and erect image is formed by a
The mirror used by a dentist to see a large image of the teeth of the patients is
A ray of light travelling in air enters obliquely into water. This light ray
The focal length of a spherical mirror is \( 10 \, cm \). Its radius of curvature is:
In an electric circuit, the device used to prevent damage to the electrical appliances due to overloading is:
One kilowatt hour is equal to
The power of an electric motor that takes \( 5 \, A \) electric current from a \( 220 \, V \) transmission line is:
The direction of force on a current carrying conductor in a magnetic field is given by
One coulomb is equivalent to the charge contained in nearly
The device used to measure electric current in a circuit is called:
If a net charge \( Q \) flows across any cross-section of a conductor in time \( t \), then the current \( I \) through the cross-section is
A continuous and closed path of an electric current is called an
SI unit of electrical potential difference is
An ideal Carnot engine has an efficiency of 40 %. The ratio of the temperature of the sink to that of the source is
If a particle is moving with a momentum of (2 × 1010) h kg·m/s, then the de Broglie wavelength associated with it (in angstrom) is (where h is Planck's constant)
The angular momentum of the electron revolving in the 2nd orbit is
In the nuclear process, 1122Na → 1022Ne + e+ + νe, then X is
In a semiconductor crystal, the total number of electrons in the outer shell is 4N . At absolute zero, the number of energy states of valence and conduction band are respectively
The eye defect astigmatism can be corrected by using a
The intensity of a polarized light can be controlled by a second polarizer from
The flux linked with a coil at any instant is given by \( \Phi = 5t^2 - 25t - 150 \) (in SI units). The emf induced in the coil at \( t = 2 \) s is
If an electron moves with a velocity \( v \) in a magnetic field \( B \), the magnetic force on the electron is maximum when the angle between \( v \) and \( B \) is
If the frequency of an electromagnetic wave is 2 MHz, then the time period of oscillation of the accelerated charge is
For the oscillations of a spring with spring constant k, the false statement is
The energy density of the electric field \( 2 \, \text{V/m} \) in a capacitor \( C \) is \( \varepsilon_0 \) is the permittivity of free space