HSC Science (Computer Science) 12th Standard Board Exam - Maharashtra State Board Question Bank Solutions for Physics

State the advantages of a full-wave rectifier.  

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

What is the reason for the Brownian motion?

State the laws of the simple pendulum?

The metre bridge works on the principle of ______.

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.

Two cells of emf 4 V and 2 V having a respective internal resistance of 1 Ω and 2 Ω are connected in parallel, so as to send current in the same direction through an external resistance of 5 Ω. Find the current through the external resistance.

What is a rectifier?

When radiation of wavelength λ is used to illuminate a metallic surface, the stopping potential is V. When the same surface is illuminated with radiation of wavelength 3λ, the stopping potential is `"V"/4`. If the threshold wavelength for the metallic surface is nλ. then value of n will be ______.

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.

State Kirchhoff's voltage law.

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?

In the given circuit, if I = 100 mA and I₁ = I₄ = 60 mA, the currents I₃ and I₅ are ______.

Define photoelectric work function of a metal.