List of top Questions asked in PSEB XII

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?

Which has the longest wavelength?

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.

Adjacent sides of a parallelogram are given by \[ \mathbf{a} = 6 \hat{i} - \hat{j} + 5 \hat{k}, \quad \mathbf{b} = \hat{i} + 5 \hat{j} - 2 \hat{k} \] Find the area of the parallelogram.

\( \frac{d}{dx} \left( \sin x^2 \right) = 2x \cos x^2 \)

If a matrix \( A \) is symmetric as well as skew-symmetric, then \( A = 0 \).