HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Important Questions

Prove that the frequency of beats is equal to the difference between the frequencies of the two sound notes giving rise to beats.

Describe biprism experiment to calculate the wavelength of a monochormatic light. Draw the necessary ray diagram.

An iron rod of the area of cross-section 0.1m² is subjected to a magnetizing field of 1000 A/m. Calculate the magnetic permeability of the iron rod. [Magnetic susceptibility of iron = 59.9, magnetic permeability of vacuum = 4π x 10^-7 S. I. unit]  

Derive an expression for path difference in Young’s double slit experiment and obtain the conditions for constructive and destructive interference at a point on the screen.

Distinguish between the phenomenon of interference and diffraction of light.

Distinguish between diamagnetic and paramagnetic substances.

An electron in an atom is revolving around the nucleus in a circular orbit of a radius of 5.3 x 10^-11 m, with a speed of 2 x 10⁶ m/s. Find the resultant orbital magnetic moment and angular momentum of the electron. [e = 1.6 x 10^-19 C, m_e= 9.1 x 10^-31 kg]

A magnet of magnetic moment 3Am² weighs 75 g. The density of the material of the magnet is 7500 kg/m³. what is magnetization? 

What is magnetic susceptibility?

State SI unit of Magnetization.

Derive an expression for ratio of e.m.f.s and currents in terms of number of turns in primary and secondary coil.

Explain why the inductance of two coils connected in parallel is less than the inductance of either coil.

Why and where are eddy currents are undesirable? How are they minimized? 

Define self-inductance.

The magnetic flux through a loop varies according to the relation Φ = 8t² + 6t + 2, Φ is in milliweber and t is in second. What is the magnitude of the induced emf in the loop at t = 2 seconds?  

Explain step up and step down transformer?

Determine the motional emf induced in a straight conductor moving in a uniform magnetic field with constant velocity on the basis of Lorentz force.

The primary of a transformer has 40 turns and works on 100 V and 100 W. Find a number of turns in the secondary to step up the voltage to 400 V. Also calculate the current in the secondary and primary.

Using Ampere's law, obtain an expression for the magnetic induction near a current-carrying straight infinitely long wire. 

Describe the construction and working of a transformer with a neat labelled diagram.