HSC Science (Computer Science) १२ वीं कक्षा - Maharashtra State Board Important Questions for Physics

State the law of radioactive decay.

What happens to a ferromagnetic substance heated above Curie temperature?

A magnet of magnetic moment 3Am² weighs 75 g. The density of the material of the magnet is 7500 kg/m³. what is magnetization? 

What is magnetic susceptibility?

Define half-life period.

Derive an expression for ratio of e.m.f.s and currents in terms of number of turns in primary and secondary coil.

With the help of a neat circuit diagram, explain the working of a photodiode. 

In a series LCR circuit, the phase difference between the voltage and the current is 45°. Then the power factor will be ______.

Draw a neat diagram of a full-wave rectifier and explain it’s working.

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

Define self-inductance.

Explain step up and step down transformer?

The primary of a transformer has 40 turns and works on 100 V and 100 W. Find a number of turns in the secondary to step up the voltage to 400 V. Also calculate the current in the secondary and primary.

Using Ampere's law, obtain an expression for the magnetic induction near a current-carrying straight infinitely long wire. 

Describe the construction and working of a transformer with a neat labelled diagram.

A radio can tune over the frequency range of a portion of the MW broadcast band (800kHz -1200kHz). If its LC circuit has an effective inductance of 200mH, what must be the range of its variable condenser? 

Draw the circuit symbol for NPN and PNP transistors. What is the difference in the Emitter, Base, and Collector regions of a transistor? 

State the law of radioactive decay.

With the help of a neat circuit diagram, explain the working of a photodiode. 

With the help of neat labelled circuit diagram explain the working of half wave rectifier using semiconductor diode. Draw the input and output waveforms.