Question # 1

What is the effect of electric and magnetic fields on X-rays

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X-rays are deflected

X-rays are not deflected

X-rays are sometimes deflected and sometimes not

Nothing can be said

In CE amplifier phased reversal occurs when the output voltage is taken between

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Base and collector

Base and emitter

Collector and emitter

None of the terminals

In which of the following studies x-rays are not helpful.

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Crystal structure

Crystal surface

Crystal symmetry

Crystal atoms

Current gain of a CE amplifier is 50, ITS hfe is about

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25

50

75

100

The usefulness of X rays is largely due to their

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Mass

Density

Volume

Penetrating power

Mosley's law establishes the x rays fluorescence's of target element with its.

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Atomic weight

Atomic number

Density

Lattice constant

In which reaction two or more small light nuclei nuclei come together or fuse to form a large nucleus.

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Radioactivity

Radioactivity dating

Nuclear fusion

Nuclear fission

Which particles have spin quantum number 1/2

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Mesons

Laptons

Hadrons

Muons

In n-p-n transistor the current flows in the direction from

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Emitter to base

emitter to collector

Base to emitter

Base to collector

Ebers-Moll model describes the working of a

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BJT

FET

MOSFET

UJT

A photon is chasing an electron, whose speed is 0.9 c What is their relative speed.

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0.1 C

C

0.8 C

0.9 C

the gain of an amplifier is independent of

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The two externally connected resistances

What is happening inside the amplifier

Internal structure of the amplifier

All of the above

Cs - 137 is a radioisotope used ot determine the thickness of the walls of steel pipes Cs 137 is chosen because it emits

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Radiowaves

Alpha particles

Beta particles

gama particles

Which given quantity remains the same in isotones.

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Mass number

Atomic number

Number of neutrons

Number of protons

Neither the position nor the momentum of a particle can be predicted with arbitrarily great precision is the statement of.

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Archimede's principle.

Heisenberg uncertainty principle

Mosley's law

Schrodinger's wave equation

The half life of radium -226 is

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1620 years

45 x 10⁹ years

3.8 days

23.5 minutes

The particles less in mass than protons are

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Measons

Bosons

Baryons

Nucleons

There are how many modes of operations of a BJT.

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2

3

4

5

When a platinum wire is heated of 1600^oC, it becomes

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orange

Cherry red

Dull red

White

A perfect back body

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Is a perfect absorber of all radiations

Is a perfect reflector of all radiations

Is a perfect reflector of visible lights radiations

Is a brownish object

On which factor cut off wavelength of X-rays coming from a Coolidge tube depends upon.

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Target material

Accelerating voltage

Filament temperature

Separation between target and the filament

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