HSC Science (General) 12th Standard Board Exam - Maharashtra State Board Important Questions

In a common-base connection, the emitter current is 6.28 mA and the collector current is 6.20 mA. Determine the common-base DC current gain.

A circular coil of 100 turns with a cross-sectional area of 1 m² is kept with its plane perpendicular to the magnetic field of 1 T. The magnetic flux linkage is ______.

Derive the relation between α and β.

Distinguish between Step up and Step Down Transformer.

What is Transformer?

Obtain an expression for the self-inductance of a solenoid.

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

In a common base configuration, the transistor has an emitter current of 10 mA and a collector current of 9.8 mA. The value of base current is ______ 

For a transistor I_C = 15 mA, I_B = 0.5 mA. What is the current amplification factor?  

An emf of 91 mV is induced in the windings of a coil when the current in o nearby coil is increasing at the rate of 1.3 A/s. what is the mutual inductance (M) of the two coils in mH?

What is a rectifier?

What is the average value of alternating current over a complete cycle?

Explain the working of the n-p-n transistor in a common base configuration.

What is a Light Emitting Diode?

Draw Light Emitting Diode circuit symbol.

What is a transformer?

Derive the equation for a transformer.

Define α.

Define β

The current in a coil changes from 50A to 10A in 0.1 second. The self inductance of the coil is 20H. The induced e.m.f. in the coil is ______.