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

A stretched wire emits a fundamental note of frequency 256 Hz. Keeping the stretching force constant and reducing the length of wire by 10 cm, the frequency becomes 320 Hz. Calculate the original length of wire.

What is Zener diode?

Define the capacitance of a capacitor and its SI unit.

Obtan an expression for potential energy of a particle performing S.H.M. What is the value of potential energy at (i) Mean position, and (ii) Extreme position

A parallel plate air condenser has a capacity of 20µF. What will be a new capacity if:

1) the distance between the two plates is doubled?

2) a marble slab of dielectric constant 8 is introduced between the two plates?

State how a moving coil galvanometer can be converted into an ammeter.

Answer in brief:

State the conditions under which the theorems of parallel axes and perpendicular axes are applicable. State the respective mathematical expressions.

On what factors do the degrees of freedom depend?

Answer in brief.

What does the hysteresis loop represent?

State the law of equipartition of energy and hence calculate the molar specific heat of mono-atomic and di-atomic gases at constant volume and constant pressure.

In a Faraday disc dynamo, a metal disc of radius R rotates with an angular velocity ω about an axis perpendicular to the plane of the disc and passing through its center. The disc is placed in a magnetic field B acting perpendicular to the plane of the disc. Determine the induced emf between the rim and the axis of the disc.

A horizontal wire 20 m long extending from east to west is falling with a velocity of 10 m/s normal to the Earth’s magnetic field of 0.5 × 10⁻⁴ T. What is the value of induced emf in the wire?

A stiff semi-circular wire of radius R is rotated in a uniform magnetic field B about an axis passing through its ends. If the frequency of rotation of wire is f, calculate the amplitude of alternating emf induced in the wire.

Show that in an AC circuit containing a pure inductor, the voltage is ahead of current by π/2 in phase.

Which property of light does not change when it travels from one medium to another?

What is the difference between a nuclear reactor and a nuclear bomb?

The half-life of \[\ce{_38^90Sr}\] is 28 years. Determine the disintegration rate of its 5 mg sample.

A needle of a sewing machine moves along a path of amplitude 4 cm with a frequency of 5 Hz. Find its acceleration `(1/30)` s after it has crossed the mean position.

Potential energy of a particle performing linear S.H.M. is 0.1 π²x² joule. If the mass of the particle is 20 g, find the frequency of S.H.M.

At what distance from the mean position is the kinetic energy of a particle performing S.H.M. of amplitude 8 cm, three times its potential energy?