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

A set of 8 tuning forks is arranged in a series of increasing order of frequencies. Each fork gives 4 beats per second with the next one and the frequency of last fork is twice that of the first. Calculate the frequencies of the first and the last fork.

Answer in brief:

If a copper disc swings between the poles of a magnet, the pendulum comes to rest very quickly. Explain the reason. What happens to the mechanical energy of the pendulum?

The angular momentum of a system of particles is conserved ______ 

Obtain an expression for the angular momentum of a body rotating with uniform angular velocity.

Show the graphical representation of radiant power of a black body per unit range of wavelength as a function of wavelength.

Draw a neat labeled diagram of Ferry’s black body. 

Explain the construction and working of Ferry’s black body.

Compare the rates of emission of heat by a blackbody maintained at 627°C and at 127°C, if the black bodies are surrounded by an enclosure at 27°C. What would be the ratio of their rates of loss of heat? 

What are beats?

State any four applications of beats.

Explain the production of beats and deduce analytically the expression for beats frequency.

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The role of inductance is equivalent to ______ 

A plane of a coil of 10 turns is tightly wound around a solenoid of diameter 2 cm having 400 turns per centimeter. The relative permeability of the core is 800. Calculate the inductance of the solenoid. 

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

What is the average value of alternating current over a complete cycle?

Two tuning forks of frequencies 320 Hz and 340 Hz are sounded together to produce a sound wave. The velocity of sound in air is 326.4 m/s. Calculate the difference in wavelengths of these waves.

A ceiling fan has a moment of inertia of 2 kg. m². It attains maximum frequency of 60 r.p.m. in 2π seconds. Calculate its power rating.

If beat frequency is 2 Hz, what is the time interval between success waxings?

Draw a neat labelled P - V diagram for a typical heat engine.