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

State the law of equipartition of energy and hence calculate the molar specific heat of mono-atomic and di-atomic gases at constant volume and constant pressure.

Answer in brief:

A gas contained in a cylinder surrounded by a thick layer of insulating material is quickly compressed has work been done?

An ideal monoatomic gas is adiabatically compressed so that its final temperature is twice its initial temperature. What is the ratio of the final pressure to its initial pressure?

When two objects are said to be in thermal equilibrium?

Four resistances 4 Ω, 8Ω, XΩ and 12Ω are connected in a series to form Wheatstone’s network. If the network is balanced, the value of X is ______.

What is the basis of Kirchhoff’s current law and voltage law?

Are Kirchhoff’s laws applicable to both AC and DC circuits?

Two cells of emf 4 V and 2 V having a respective internal resistance of 1 Ω and 2 Ω are connected in parallel, so as to send current in the same direction through an external resistance of 5 Ω. Find the current through the external resistance.

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

Draw a neat labelled diagram for the construction of 'cyclotron'

If the polarising angle for a given medium is 60°, then the refractive index of the medium is.................

Determine the change in wavelength of light during its passage from air to glass. If the refractive index of glass with respect to air is 1.5 and the frequency of light is 3.5 x 10¹⁴ Hz, find the wave number of light in glass.

[Velocity of light in air c = 3 x 10⁸ m/s]

What is a Polaroid?

With the help of neat diagram, explain how non-polar dielectric material is polarised in external electric field of increasing intensity. Define polarisation in dielectrics.

Wavelengths of two notes in the air are`[70/153]^m` and `[70/157]^m`. Each of  these notes produces 8 beats per second with a tuning fork of fixed frequency. Find the velocity of sound in the air and frequency of the tuning fork.

Draw a neat labelled diagram showing the plane of vibration and plane of polarisation for polarised light.

In a cyclotron, magnetic field of 3·5Wb/m2 is used to accelerate protons. What should be the time interval in which the electric field between the Dees be reversed?
(Mass of proton = 1· 67 x 10^-27Kg, Charge on proton =1·6x10^-19c).

On the basis of Huygens' wave theory of light prove that velocity of light in a rarer medium is greater than velocity of light in a denser medium.

For a glass plate as a polariser with refractive index 1.633, calculate the angle of incidence at which light is polarised.

If the critical angle of a medium is sin^-1(3/5), find the polarising angle.