HSC Science (Electronics) इयत्ता १२ वी - Maharashtra State Board Question Bank Solutions

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. 

The thermal efficiency of a heat engine is 25%. If in one cycle the heat absorbed from the hot reservoir is 50000 J, what is the heat rejected to the cold reservoir in one cycle?

What are the steps through which a refrigerant goes in one complete cycle of refrigeration?

A sonometer wire under a tension of 40 N vibrates in unison with a tuning fork of frequency 384 Hz. Find the beat frequency when the tension in the wire is reduced by 0.21 N.

A blackbody at 327 °C, when suspended in a black enclosure at 27 °C, loses heat at a certain rate. Find the temperature of the body at which its rate of loss of heat by radiation will be half of the above rate. Assume that the other conditions remain unchanged. 

What does a heat engine consist of?

A short bar magnet of moment 0.5.A m² is suspended in a horizontal magnetic field of 1000 gauss such that it can rotate freely in a horizontal plane. Calculate (i) the magnitude of the torque and (ii) the magnetic potential energy when its angular displacement with respect to the direction of the field is 10°.

The power factor of LCR circuit is ______.

What is a heat engine?

Mention any two elements of a heat engine.

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

The effective capacitor between A and B in the following circuit is ______.

Explain the theory of an AC circuit with a resistor. 

Explain the mechanism of a refrigerator with the help of a schematic diagram.

The coefficient of performance of a room air conditioner is 3. If the rate of doing work is 2 kW, the heat current is ______.

Which physical quantity of an atomic electron has the dimensions same as that of h?

Where is the power dissipated in an alternating current circuit?