HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Important Questions

How much amount of work is done in forming a soap bubble of radius r?

Answer in brief:

State the characteristics of stationary waves.

Derive an expression for the equation of stationary wave on a stretched string.

Explain how vibrating strings can be verified using a sonometer.

A wave of frequency 500 Hz is traveling with a speed of 350 m/s. (a) What is the phase difference between two displacements at a certain point at times 1.0 ms apart? (b) what will be the smallest distance between two points which are 45° out of phase at an instant of time?

A violin string vibrates with fundamental frequency of 440Hz. What are the frequencies of the first and second overtones?

The string of a guitar is 80 cm long and has a fundamental frequency of 112 Hz. If a guitarist wishes to produce a frequency of 160 Hz, where should the person press the string?

Insect moves over the surface of water because of ______.

The surface tension of a liquid at critical temperature is ______ 

Explain the phenomena of surface tension on the basis of molecular theory.

Obtain an expression for the capillary rise or fall using the forces method.  

A set of tuning forks is arranged in ascending order of frequencies each tuning fork gives 8 beats/s with the preceding one. If the frequency of the first tuning fork is 120 Hz and the last fork is 200 Hz, then the number of tuning forks arranged will be, ______ 

Why wave motion is doubly periodic?

What are overtones?

State law of length.

State law of linear density.

For a stationary wave set up in a string having both ends fixed, what is the ratio of the fundamental frequency to the third harmonic?

State any four applications of beats.

How the frequency of the vibrating wire is affected if the load is fully immersed in water? 

Show that even as well as odd harmonics are present as an overtone in modes of vibration of the string.