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

Draw a neat labelled circuit diagram of a full-wave rectifier using a semiconductor diode.

State the advantages of a full-wave rectifier.  

Draw the block diagram of a simple rectifier circuit with the respective output waveform. 

State the laws of the simple pendulum?

Is it always necessary to use red light to get a photoelectric effect?

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

What is a rectifier?

If the maximum kinetic energy of emitted electrons in the photoelectric effect is 2eV, the stopping potential will be ______.

If friction is made zero for a road, can a vehicle move safely on this road?

Write the mathematical formula for Bohr magneton for an electron revolving in n^th orbit.

Find the magnitude of the electric field just above the middle of a large, flat, horizontal metal sheet carrying a charge density of 90 nC/m².

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].

Explain the failure of wave theory of light to account for the observations from experiments on photoelectric effect.

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

Define photoelectric work function of a metal.

What is banking of a road? 

Why it is necessary banking of a road?

Give Einstein's explanation of the photoelectric effect.

A 2-m long thin and straight metal wire carries a positive charge of 3 µ C. (a) What is the linear charge density on the wire? (b) Hence, find the electric intensity at a point 1.5 m away from the centre of the wire.

Express Faraday-Lenz's law of electromagnetic induction in an equation form.