Question # 1

A photo diode can turn its current ON and OFF in

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Micro seconds

Mega seconds

Nano seconds

Mili seconds

The material whose resistivity becomes zero below a certain temperature

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Conductors

Semi conductors

Super conductors

Insulators

The SI Unit of magnetic induction is.

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Weber

Tesla

Gauss

Newton

When 10 V are applied to an A.C circuit, the current flowing in it is 100 mA. It impedance is.

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100 Ohm

10 Ohm

1000 Ohm

1 Ohm

Thermistor with high - ve temperature coefficient are very accurate for measuring low temperature especially near is.

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10 kelvin

70 kelvin

200 kelvin

35 kelvin

The unit of radioactivity is:

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Bequerel

Henry

Pascal

Joule

To get N-Type the Ge is doped with

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Aluminium

Arsenic

Boron

Indium

The photoelectric effect predicts that light is made of

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Photons

Neutrons

Protons

None of these

Ampere's law is applicable to:

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Circular path

Rectangular path

To any closed path

Nonwe of these

In an N-type silicon, which of the following statement is true?

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Electrons are majority carriers & trivalent atoms are the dopants

Electrons are majority carriers & pentavalent atoms are the dopants

Holes are minority carriers & pentavalent atoms are the dopants.

Holes are minority carriers & trivavalent atoms are the dopants.

The first atomic reactor was introduced by

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Currie

Enrico Fermi

Newton

Bohr

We can find from de Broglie formula

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Wavelength

Amplitude

Speed of wave

Frequency of wave

Photons emitted in inner shell transition are.

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Continuous X -rays

Discontinuous X rays

Characteristic X rays

Energetic X rays

If a charge body moved against the electric field it will again

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Potential energy

K.E

Mechanical Energy

Electric potential energy

The resonance frequency is given by:

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fr = 2π√LC

fr = 1/2πLC

fr = 1/ 2π√LC

f1 = 1/ 2πC√L

Unit of decay constantλ is:

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ms

m^-1

m

S^-1

Coulomb /volt is called.

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Farad

Ampere

Joule

Henry

Materials can be identified by measuring their

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Mass

Half life

Both a and b

None of a,b,c

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