Question # 1

At room temperature the p.d. between the two sides of depletion region for germanium is of the order of.

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0.3 V

0.5 V

0.7 V

0.9 V

A p-type material is formed then a semiconductor is doped with

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Trivalent impurity

Tetravalent impurity

All of above

A material having excess of free electrons

Which electrical quantity has the same units as electromotive force.

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Charge

Current

Potential difference

Power

The materials whose resistivity becomes zero below a certain temperature.

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Semi conductors

Super conductors

Insulators

conductors

What for is semiconductor diode used.

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To convert D.C. to A.C.

To convert A.C. to D.C.

To increase voltage

To decrease voltage

At high frequency the current through a capacitor will be

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Small

Zero

Large

Infinity

Current per unit area is called.

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Electric potential

Current density

Charge density

Electric intensity

A semiconductor diode conducts only when it is

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Not biased

Zero biased

Reverse biased

Forward and biased

With high frequencies capacitive reactance

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Increases

Decreases

Becomes double

Becomes half

When a balloon sticks to the whiteboard It is an example of.

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Conoduction

Induction

Polarization

Conservation of charge

Which of the following remains unaffected in a magnetic field.

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a particles

b partciles

gama particles

Electrons

The property of an object that causes it to create a magnetic field in opposition to an externally applied magnetic field is.

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Paramagnetism

Diamagnetism

Ferromagnetism

Demagnetism

In a series resonant circuit, the current at resonance is.

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Maximum

Minimum

Zero

Sometimes maximum and sometimes minimum

Why a positive charged object is made neutral by someone touching it.

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Electrons flow from the object

Proton flow onto the object

Protons flow from the object

Proton flow onto the object

The force experienced by a unit positive charge at that point placed in an magnetic field is known as.

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Electric field intensity

Electric flux

Electric potential

Electric dipole

Which of the following is an example of induced magnetism.

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A compass needle pointing north

A north pole attracting iron filings

A northpole repelling a north pole

The coil of a motor turning in a magnetic field.

in the region where the field lines are parallel and equally spaced, the field is.

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Zero

Unirorm

Non uniform

Negative

The typical value of forbidden energy gap in germinium is.

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0.7 eV

1.0 eV

1.4 eV

10 eV

In an A.C. circuit the current.

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Is in phase with voltage

Leads the voltage

Lags the voltage

Any of these depending upon the circumstances

A well known example of an intrinsic semi conductors is.

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Germanium

Phosphorus

Cobalt

Aluminium

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