List of top Questions asked in PSEB XII

What are the factors which reduce the efficiency of a transformer?
What is displacement current?
The density of nuclear matter is independent of the size of the nucleus. (T/F)
The size of the mirror does not affect the nature of the image. (T/F)
Define threshold wavelength and frequency.
Calculate the de-Broglie wavelength for electrons moving with speed of \( 10^5 \, \text{m/s} \).
Write an expression for mass defect.
Why can’t two equipotential surfaces intersect each other?
Wheatstone bridge is used to measure:
The ultimate individual unit of magnetism in any magnet is:
The laws of electromagnetic induction have been used in the construction of:
Diffraction of light is the phenomenon of bending of light around the corners of an aperture in its path. (T/F)
The strength of a bar magnet is maximum at its center. (T/F)
A semiconductor is a device that obeys Ohm's law. (T/F)
In the Bohr model of the hydrogen atom, the lowest orbit corresponds to:
On doping, the conductivity of a semiconductor:
Applying forward bias in a p-n junction, the potential barrier:
When the distance between the charges is halved, the force between the charges becomes:
If a dielectric is kept between two plates of a capacitor, its capacitance:
The image of a real object as seen through a convex mirror is:
Hugen's wave theory allows us to know about:
Velocity of light is maximum in:
The conversion of light energy into electrical energy is achieved in a:
The maximum kinetic energy of the photoelectrons depends only on:
What is the peak value of AC 220 Volt?