HSC Science (Electronics) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions

What are eddy currents?

The kinetic energy and angular momentum of a body rotating with constant angular velocity are E and L. What does `(2E)/L` represent?

Which of the following would permit finer detail to be examined using a microscope of a given numerical aperture?

Determine the limit of resolution of a telescope for the light of wavelength 500 nm if the telescope objective has diameter of 5.08 m.

 An alternating emf is applied to a series combination of an inductor and a resistor (R = 100 Ω ). If the impedance of the circuit is `100 sqrt2  Ω`, what is the phase difference between the emf and the current?

Define the resolving power of a telescope.

State the formula for resolving the power of a telescope.

What are the advantages of using a large objective lens in an astronomical telescope?

The angular displacement of a particle in 6 sec on a circle with angular velocity `pi/3` rad/sec is ______.

When a sphere rolls without slipping, the ratio of its kinetic energy of translation to its total kinetic energy is ______.

What is absolute zero temperature?

Draw a neat labelled diagram of displacement current in the space between the plates of the capacitor.

What is the resolving power of telescope if the diameter of the objective of the telescope is 1.22 m and the wavelength of light is sooo A?

A disc of mass 4 kg rolls on a horizontal surface. If its linear speed is 3 m/ s, what is its total kinetic energy?

Write statement of second law of thermodynamics.

What is mass defect?

Explain the elementary idea of an oscillator with the help of block diagram

A solenoid 3.142m long and 5.0 cm in diameter has two layers of windings of 500 turns each and carries a current of 5A. Calculate the magnetic induction at its centre along the axis.

Two metal spheres having charge densities 5μC/m² and -2μC/m² with radii 2mm and  1mm respectively are kept in a hypothetical closed surface. Calculate total normal electric induction over the closed surface.

Light of a certain wavelength has a wave number `barv` in vacuum. Its wave number in a medium of refractive index n is _______.