HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

A sonometer wire is subjected to a certain tension. If the tension is increased four times and the length of wire is reduced to half the original value, how is frequency of vibrations altered?

Draw a neat labelled diagram of unpolarized light passing through two polarizers.

When an inflated ballon is suddenly burst, why is the emerging air slightly cooled?

One beat means that the intensity of sound should be ______.

Calculate the change in angular momentum of the electron when it jumps from third orbit to first orbit in hydrogen atom.
(Take h = 6.33 × 10⁻³⁴ Js)

Describe in brief the different ways of electron emission from a metal surface.

An ideal gas is taken through a cyclic process ABCDA as shown in figure. The net work done by the gas during the cycle is ______.

What do you mean by wave frequency associated?

What do you mean by Wave number associated?

Two consecutive harmonics of air column in a pipe closed at one end are frequencies 150 Hz and 250 Hz. Calculate the fundamental frequency.

Two organ pipe, open at both ends, are sounded together and 5 beats are heard per second. The length of shorter pipe is 0.25 m. Find the length of the other pipe. (Given: Velocity of sound in air = 350 m/s and end correction at one end = 0.015 m, same for both pipes.)

Explain how can a gas be expanded at constant temperature.

Draw a neat labelled diagram of Polarization of light.

Draw a neat labelled diagram of Polarization by reflection.

Calculate the values of x and y in the following nuclear reaction.

\[\ce{^227_89Ac -> ^211_82Pb + x[^4_2He]+ y[^0_-1e]}\]

What is binding energy of nucleus?

In a cyclic process, if ΔU = internal energy, W = work done, Q = Heat supplied then ______.

Prove the Mayer's relation `C_p - C _v = R/J`

Derive an expression for critical velocity of a satellite revolving around the earth in a circular orbit.

A coin kept at a distance of 5cm from the centre of a turntable of radius 1.5m just begins to slip when the turntable rotates at a speed of 90 r.p.m. Calculate the coefficient of static friction between the coin and the turntable.

[g = 9.8 m/s²]