HSC Science (Electronics) इयत्ता १२ वी - Maharashtra State Board Important Questions for Physics

In the stationary wave, the distance between a node and its adjacent antinode is _______.

(a) λ

(b) `lambda/4`

(c) `lambda/2`

(d)  2λ

In Melde’s experiment, when the tension in the string is 10 g wt then three loops are obtained. Determine the tension in the string required to obtain four loops, if all other conditions are constant.

What is meant by harmonics?

Show that only odd harmonics are present as overtones in the case of an air column vibrating in a pipe closed at one end.

Assuming expression for impedance in a parallel resonant circuit, state the conditions for parallel resonance. Define resonant frequency and obtain an expression for it.

Show that even as well as odd harmonics are present as overtones in the case of an air column vibrating in a pipe open at both the ends.

A wheel of moment of inertia 1 kg.m² is rotating at a speed of 30 rad/s. Due to friction on the axis, it comes to rest in 10 minutes. Calculate the average torque of the friction.

A stretched sonometer wire is in unison with a tuning fork. When the length of the wire is increased by 5%, the number of beats heard per second is 10. Find the frequency of the tuning fork.

A sonometer wire 1 metre long weighing 2 g is in resonance with a tuning fork of frequency 300 Hz. Find tension in the sonometer wire.

Choose the correct option:

A parallel plate capacitor is charged and then isolated. The effect of increasing the plate separation on charge, potential, capacitance respectively are ______.

Answer in brief:

If the difference between the radii of the two spheres of a spherical capacitor is increased, state whether the capacitance will increase or decrease.

A dipole with its charges, −q and + q located at the points (0, −b, 0) and (0, +b, 0) is present in a uniform electric field E. The equipotential surfaces of this field are planes parallel to the yz plane.

1. What is the direction of the electric field E?
2. How much torque would the dipole experience in this field?

State law of length.

State law of linear density.

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. 

Waves produced by two vibrators in a medium have wavelength 2 m and 2.1 m respectively. When sounded together they produce 8 beats/second. Calculate wave velocity and frequencies of the vibrators.

A dipole is placed in a uniform electric field, its potential energy will be minimum when the angle between its axis and field is ______ 

If an electron is brought towards another electron, the electric potential energy of the system ______.

Which physical quantity has its unit as J/C? Is it a scalar or vector?