Question # 1

the number of terminals in a semiconductor diode are

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2

3

4

5

An electron miroscope emplys which to one of the following particles?

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Electron ahve a wave nature

Electrons can be focused by an electric field

Electrons can be focused by a magnetic field

All of the above

When a nucleus emits an alpha particle, its atomic mass decreases by

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1

2

3

4

The SI unit of magnetic induction 'B' Tesla is equal to.

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NA-1m-1

Nam-1

NA-1 m

Na2m-1

If the kinetic energy of a free electron doubles, its de Broglie wavelength changes by the factor.

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√2

1/√2

2

1/2

Joule second is the unit of.

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Energy

Wein's constant

Planck's constant

Boyle's law

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

Two parrallel, metal plates are a distance 8.00 m apart. The electric field between the plates in uniform, Directed toward the right , and has a magnitude of 4.00 N/C. If an ion of charge +2e is released at rest at the left-hand plate. What is its kinetic energy when reaches the right-hand plate?

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4 eV

64 eV

32 eV

16 eV

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

Wave nature of light appears in

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Pair production

Compton effect

Photo electric

Interference

Which one is pentavalent impurity

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Boron

Gallium

Antimony

Indium

In frequency modulation, the amplitude of carrier waves is

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Increases

Remains constant

Decreases

None of these

Which of the following are not hadrons.

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Muons

Mesons

Positrons

Neutrons

Earth orbital speed is

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10 km/s

20 km/s

30 km/s

40 km/s

Dielectric constant _εr for air is:

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1

1.006

1.0002

1.0006

The fraction change in resistance per Kelvin is known as:

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Temperature coefficient of Resistance

Coefficient of voltage of change

Thermal expansion

All of the above

The application of mutual induction is a.

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D.C. motor

Radio

Television

Transformer

A transistor has:

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Two regions

Three regions

Single regions

Four regions

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