HSC Science (Electronics) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions

What is a second pendulum?   

Obtain an expression for a time period of the simple pendulum.

A man standing unsymmetrical position between two mountains and fires a gun. He hears the first echo after 1.5 s and the second echo after 2.5 s. If the speed of sound in air is 340 m/s, then the distance between the mountains will be ______ 

An organ pipe of length 0.4 m is open at both ends. The speed of sound in the air is 340 m/s. The fundamental frequency is ______ 

What is the interference of sound waves? 

A string 1 m long is fixed at one end. The other end is moved up and down with a frequency of 20 Hz. Due to this, a stationary wave with four complete loops gets produced on the string. Find the speed of the progressive wave which produces the stationary wave. 

Derive the expression for magnetic field produced by a current in a circular arc of wire.

Find an expression for the power expended in pulling a conducting loop out of a magnetic field.

Two inductor coils with inductance 10 mH and 20 mH are connected in series. What is the resultant inductance of the combination of the two coils?

Eight droplets of water each of radius 0.2 mm coalesce into a single drop. Find the decrease in the surface area.

Define second’s pendulum.

Derive a formula for the length of second's pendulum.

Derive an expression for energy stored in the magnetic field in terms of induced current.

Find the work done when a drop of mercury of radius 2 mm breaks into 8 equal droplets. [Surface tension of mercury = 0.4855 J/m²].

What is the Van de Graaff generator?

State the Van de Graaff generator principle of working.

What is the temperature at which a blackbody radiates heat at the rate of 1 kilowatt per square metre?

The equation of motion in differential form for a seconds pendulum is ______.

A simple pendulum of length 196 cm performs linear SHM of amplitude 8 cm. Find the restoring force on its bob of mass 50 g at an extreme position.

Explain Planck's idea of the quantization of energy.