List of top Physics Questions

Explain the working method of p-n junction diode in reverse bias with the help of a circuit diagram.
What is an astronomical telescope? Draw ray diagram for an astronomical telescope when final image is formed at infinity.
Which nature of light is supported by Young's double slit experiment? The light used in Young's double slit experiment contains two wavelengths, 6000 \AA\ and 5000 \AA. Separation between the slits is \(10^{-3}\) m and the screen is at a distance of 1 m from the slits. Find minimum distance from the central maxima where bright fringes for both the wavelengths are coincident.
State Gauss's law in electrostatics. On the basis of it, obtain the formula for the electric field produced due to a plane charged plate.
Give pictorial representation of polarized and unpolarised light. Polarizing angle for a transparent medium is 60°. Find the value of angle of refraction and refractive index of the medium.
Write down the equation for Lorentz force. An electron passes undeviated from a place where an electric field \(5 \times 10^4~\text{V/m}\) and magnetic field of \(5 \times 10^{-2}~\text{weber/m}^2\) are applied. Calculate the velocity of the electron.
Explain the meaning of binding energy of a nucleus. Write the dependency of binding energy per nucleon on the mass number of the nucleus.
What is the meaning of electrical capacity of a conductor? Find the unit of the electrical capacity of the conductor.
Name the waves of longest wavelength and highest frequency in the given electromagnetic waves — microwaves, X-rays, radio waves, and \(\gamma\)-rays. What is meant by displacement current?
With the help of the given circuit, find out the total resistance of the circuit and the current flowing through the cell.
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What is the meaning of stationary orbit of atom? Deriving formula for the energy of the electron in the stationary orbit of the hydrogen atom, mention its relation with the radius of the orbit of electron.
Do two equipotential surfaces intersect each other? Answer with reason.
Equation of electric field of a plane electromagnetic wave is given as:
\[ E_z = 60 \sin(500x + 1.5 \times 10^{11} t) \, \text{V/m}. \] Write the equation for the magnetic field of the wave.
Write de-Broglie formula for the wavelength of matter waves.
On connecting a cell of e.m.f. 0.5 volt with an external resistance of 1.9 $\Omega$, the current flowing is 0.75 A. The internal resistance of the cell is:
On which principle does a nuclear reactor work?
In an alternating circuit, the reading of the voltmeter is 220 V. Write the peak value of the voltage.
Write down Einstein's equation for the photoelectric effect.
A concave lens of focal length -18 cm is placed in contact with a convex lens of focal length +12 cm. The focal length of the combination will be:
Resistivity of a conducting wire depends on:
Resistance of an ideal p-n junction diode in reverse bias is:
Electrostatic force between two point charges placed in a medium of dielectric constant \( k \) is \( F_1 \). On changing the medium, electrostatic force between the charges becomes \( F_2 \). Dielectric constant of the medium will be:
A charge \( q \) enters with speed \( v \) in the direction of magnetic field \( B \). The force on the charge in magnetic field will be:
What is an electrical capacitor? Find the expression for the capacity of a parallel plate capacitor. On which factors does the capacitance depend?
Explain the meaning of rectification. Using a p-n junction diode, draw a circuit diagram of a full-wave rectifier and give a brief description of its working. Give a graphical representation of input and output voltage/current.