List of top Questions asked in PSEB XII

The size of the mirror does not affect the nature of the image. (T/F)

Calculate the de-Broglie wavelength for electrons moving with speed of \( 10^5 \, \text{m/s} \).

Why can’t two equipotential surfaces intersect each other?

The density of nuclear matter is independent of the size of the nucleus. (T/F)

Write an expression for mass defect.

Diffraction of light is the phenomenon of bending of light around the corners of an aperture in its path. (T/F)

The laws of electromagnetic induction have been used in the construction of:

A semiconductor is a device that obeys Ohm's law. (T/F)

Wheatstone bridge is used to measure:

The ultimate individual unit of magnetism in any magnet is:

The strength of a bar magnet is maximum at its center. (T/F)

In the Bohr model of the hydrogen atom, the lowest orbit corresponds to:

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:

On doping, the conductivity of a semiconductor:

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:

The image of a real object as seen through a convex mirror is:

Which has the longest wavelength?

What is the peak value of AC 220 Volt?

If a die is tossed once, then the probability of getting an odd prime number is:

Prove that for any two non-zero vectors \( \mathbf{a} \) and \( \mathbf{b} \), \[ |\mathbf{a} + \mathbf{b}| \leq |\mathbf{a}| + |\mathbf{b}| \] Also, write the name of this inequality.