Question # 1

The resonance frequency is given by:

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fr = 2π√LC

fr = 1/2πLC

fr = 1/ 2π√LC

f1 = 1/ 2πC√L

The first atomic reactor was introduced by

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Currie

Enrico Fermi

Newton

Bohr

In Pakistan the frequency of A.C. supply is.

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50 Hz

60 Hz

45 Hz

70 Hz

The unit of impedance is.

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Henry

Hertz

Ampere

Ohm

The P.D develop in case of silicon is:

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0.7V

0.3V

0.5V

0.9V

The velocity of electron moving is 1st orbit of hydrogen atom is:

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2.09 x 10⁶ ms^-1

2.18 x10⁶ ms^-1

2.19 x 10⁶ ms^-1

3.18 x10⁶ ms^-1

Cosmic rays consist of

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Protons

High energy photons

Positron

All of above

Laser can be made by creating.

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Meta stable

Population inversion

Excited state

All of these

A galvanometer is an electrical instrument used to

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Measure resistance

Measure voltage

Detect passage of current

None of these

Doping is made comparatively larger in

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Emitter

Base

Collector

P -type semi conductor

The device in which induced emf is statically induced emf is:

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Transforms

AC generator

Alevator

Dynamo

I amu =

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9.31 MeV

931 MeV

9.031 MeV

None of above

The unit of Magnetic flux is called.

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weber

weber/m²

NM^-1A^-1

None of above

A substance having the negative temperature co efficient of resistivity out of the following is.

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Carbon

Iron

Tungsten

Gold

The only difference between the construction of D.C and A.C is.

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Carbon burshes

Coil

Commutator

Magnetic field

The temperature at which, semiconductor behaves as insulators:

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10k

0k

237k

None of above

Electric flux is a:

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Scalar quantity

Vector quantity

Variable quantity

None of these

Which one of the following is correct

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All of above

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