Question # 1

X-rays can penetrate in a solid matte through a distance of several:

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Kilo metres

Metres

Centimeters

A few angstroms

One micrometer

The first series which was identified in the spectrum of hydrogen is called:

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Lyman series

Balmer series

Paschen series

Brackett series

Pfund series

Laser is a beam of:

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Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

The value of the metastable state for Neon is

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20.66eV

20.61eV

19.23eV

18.70eV

The holes created in the L and M shells are occupied by transitions of:

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Electrons from lower states

Electrons from higher state

Positrons from higher states

Electrons from K shell

Both (A) and (B)

The photocopying process is called:

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Geography

Sonography

Xerography

Zerography

None of these

An electron of the hydrogen atom in the second orbit is called its:

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Ground state

Excited state

Ionized state

Any of these

None of these

The lasing or active medium in He-Ne laser discharge tube is:

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Nitrogen

Helium

Hydrogen

Neon

None of these

The process of formation of spectrum is called:

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Interference

Spectroscopy

Dispersion

Reflection

Botha (A) and (D)

The formula of Brackett series can be obtained by putting in the general formula, the value of n equal to:

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one

two

three

four

five

The inkjet printer eject a thin stream of:

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Water

Oil

Ink

Any above

None of these

A metastable stae:

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Is an excited state

Is that in which excited electron is stable

Is that in which excited electron is usually unstable

Means a time interval of 10^-8second

Both (A) and (C)

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

Braking radiation causes:

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Continuous spectrum

Line Spectrum

Band spectrum

Discrete specturm

All of these

An compared to solid matter, a crack or an air bubble allows:

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Great amount of X-rays to pass

Smallast amount of X-rays to pass

Very samall amount of X-rays to pass

Any of these

None of these

Balmer series lies in that region of electromagnetic wave spectrum which is called:

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Visible region

Invisible region

Infra-red region

ultraviolet region

None of these

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Physics ECAT Pre Engineering Chapter 20 Atomic Spectra Physics Online Test MCQs With Answers

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