HSC Science (Electronics) इयत्ता १२ वी - Maharashtra State Board Important Questions

Explain De Broglie’s Hypothesis.

With the help of a circuit diagram describe the experiment to study the characteristics of the photoelectric effect. Hence discuss any 2 characteristics of the photoelectric effect.  

Is it always necessary to use red light to get a photoelectric effect?

Explain de-Broglie wavelength.

Obtain an expression for de-Broglie wavelength of wave associated with material particles. The photoelectric work function for metal is 4.2 eV. Find the threshold wavelength.

If the maximum kinetic energy of emitted electrons in the photoelectric effect is 2eV, the stopping potential will be ______.

An electron is accelerated through a potential difference of 100 volts. Calculate de-Broglie wavelength in nm.

To convert a moving coil galvanometer into an ammeter we need to connect a ______.

In a photoelectric experiment, the stopping potential is 1.5V. What is the maximum kinetic energy of a photoelectron?

Distinguish between ‘paramagnetic’ and ‘ferromagnetic’ substances.

The decay constant of radioactive substance is 4.33 x 10^-4 per year. Calculate its half life period.

A circular coil of 300 turns and average area 5 * 10^-3m² carries a current of 15A. Calculate the magnitude of magnetic moment associated with the coil.

Which of the following substances is ductile?

Give any ‘two’ points of differences between diamagnetic and ferromagnetic substances.

In a hydrogen atom, an electron carrying charge 'e' revolves in an orbit of radius 'r' with speed 'v'. Obtain an expression for the magnitude of magnetic moment of a revolving electron.

The magnetic moment of a magnet of dimensions 5 cm × 2.5 cm × 1.25 cm is 3 Am². Calculate the intensity of magnetization.

The susceptibility of magnesium at 200 K is 1.8 x 10^-5. At what temperature will the susceptibility decrease by 6 x 10^-6?

Show that the orbital magnetic dipole moment of a revolving electron is `(eVr)/2`

An electron in an atom revolves around the nucleus in an orbit of radius 0.53 Å. If the frequency of revolution of an electron is 9 x10⁹ MHz, calculate the orbital  angular momentum

[Given : Charge on an electron = 1.6 x 10^–19 C; Gyromagnetic ratio = 8.8 x 10¹⁰ C/kg; π = 3.142]

Find the magnetization of a bar magnet of length 10 cm and cross-sectional area 4 cm², if the magnetic moment is 2 Am².