HSC Science (Electronics) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions for Physics

State any four applications of Doppler effect

Define moment of inertia. State its SI unit and dimensions.

At which position of the plane of the rotating coil with the direction of magnetic field, the e.m.f. induced in the coil is maximum?

State Brewster’s law and show that when light is incident at polarizing angle the reflected and refracted rays are mutually perpendicular to each other.

Soft iron is used to make the core of the transformer because of its ______.

Which property of soft iron makes it useful for preparing electromagnet?

What should be retentivity and coercivity of permanent magnet?

Answer in brief.

Explain one application of electromagnet.

Compare resistance and reactance.

Answer in brief:

What are harmonics and overtones?

Which of the following phenomenon proves that light is a transverse wave?

What is Brewster’s law? Derive the formula for Brewster’s angle.

Calculate the binding energy of an alpha particle given its mass to be 4.00151 u.

An electron in hydrogen atom stays in its second orbit for 10⁻⁸ s. How many revolutions will it make around the nucleus at that time?

In a periodic table the average atomic mass of magnesium is given as 24.312 u. The average value is based on their relative natural abundance on earth. The three isotopes and their masses are\[\ce{_12^24Mg}\](23.98504 u), \[\ce{_12^25Mg}\] (24.98584 u), and \[\ce{_12^26Mg}\] (25.98259 u). The natural abundance of \[\ce{_12^24Mg}\] is 78.99% by mass. Calculate the abundances of other two isotopes.

The safest way to protect yourself from lightning is to be inside a car. Justify.

State two applications of Pascal's law.

When unpolarized light is passed through a polarizer, its intensity ______.

Give an example of some familiar process in which heat is added to an object, without changing its temperature.

Answer in brief.

Why should a Carnot cycle have two isothermal two adiabatic processes?