List of top Questions asked in Bihar Board Class XII

How does refractive index of any medium depend upon the wavelength of light?

What is Curie temperature?

Which of the following represents resistance, R?
\( \rho = \text{resistivity}, l = \text{length of material}, A = \text{cross-sectional area} \)

The relative permeability (\( \mu_r \)) of ferromagnetic substance is

In series circuit with resistors \( R_1, R_2, R_3 \), the current flowing through each resistor is

The unit of current density is

If the length of a conductor is doubled while keeping the potential difference across it constant, then the drift velocity of electron will

The direction of magnetic field inside a current carrying solenoid is

Equivalent energy of 1 amu is

A capacitor of 100 \(\mu F\) is charged to 100 volt. The energy stored in it will be

Which of the following has unit volt-metre\(^{-1}\)?

The relation between drift velocity \( v \) of free electrons in conductor and potential difference \( V \) between ends of conductor is

The graph between voltage \( V \) of a conductor and current \( I \) is a straight line, which makes an angle \( \theta \) with the y-axis (which represents \( I \)). The resistance of the conductor will be

Power of electric circuit is

With the rise in temperature, the resistance of semiconductor

Which one of the following frequency ranges is used for TV transmission?

What is the main difference between isotopes of the same element?

Which one of the following is not a type of radioactive decay?

What is the energy of a photon with a wavelength of 500 nm?
(Use \( c = 3 \times 10^8 \) m/s and \( h = 6.626 \times 10^{-34} \) Js)

Which series of hydrogen spectrum lies in visible portion?

Which of the following is chargeless particle?

X-rays are

When boron is mixed as impurity in silicon, then resultant matter is

In n-type semiconductor the minority charge carrier is/are

Which logic gate's output is true only if the inputs are different?