HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Question Bank Solutions for Physics

Choose the correct option:

A Series resistance is connected in the Zener diode circuit to ______.

An LED emits visible light when it’s ______.

Solar cell operates on the principle of ______.

Answer in brief.

How is a Zener diode different than an ordinary diode?

Answer in brief.

On which factors does the wavelength of light emitted by a LED depend?

Answer in brief.

Why should a photodiode be operated in reverse biased mode?

State the principle of solar cells.

Answer in brief.

State the uses of the solar cell.

Explain how a Zener diode maintains a constant voltage across a load.

Explain the forward and the reverse characteristic of a Zener diode.

Explain the working of a LED.

Explain the principle of operation of a photodiode.

In SI units, the differential equation of an S.H.M. is `("d"^2"x")/("dt"^2)` = − 36x. Find its frequency and period.

A charge 6 µC is placed at the origin and another charge - 5 µC is placed on the y-axis at A = (0, 6.0 m). 

(a) Calculate the net electric potential at P = (8.0 m, 0).
(b) Calculate the work done in bringing a proton from infinity to point P. What is the significance of the negative sign?

One hundred and twenty five small liquid drops, each carrying a charge of 0.5 µC and of diameter 0.1 m form a bigger drop. Calculate the potential at the surface of the bigger drop.

When a plate of magnetic material of size 10 cm × 0.5 cm × 0.2 cm (length, breath, and thickness respectively) is located in a magnetizing field of 0.5 × 10⁴ A/m^-1, then a magnetic moment of 0.5 Am² is induced in it. Find the magnetic induction in the plate.

When a plate of magnetic material of size 10 cm × 0.5 cm × 0.2 cm (length, breath, and thickness respectively) is located in a magnetizing field of 0.5 × 10⁴ A/m^-1, then a magnetic moment of 0.5 Am² is induced in it. Find the magnetic induction in the plate.

Explain why the inductance of two coils connected in parallel is less than the inductance of either coil.

Derive an expression for the difference in tensions at the highest and lowest point for a particle performing the vertical circular motion. 

Find the kinetic energy of 3 litre of gas at S.T.P given standard pressure is 1.013 × 10⁵ N/m².