Question # 1

Laser is a beam of:

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Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

The transitions of electrons in the hydrogen atom result in the emission of spectral lies in the:

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Ultra red region

Visible region

Ultraviolet region

Any of these

None of these

The results of spectra obtained by Balmer were expressed in 1896 by:

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Bohr

Rydberg

Planck

Rutherford

Coulomb

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

The natural arrangement of colours in the spectrum of white light spectrum is

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VIBGYOR

ROYBGIV

ROYBIGV

BIGROYV

None of these

Balmer series was identified in:

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1685

1785

1885

1985

1585

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

In helium Neon Laser Neon = 15% and Helium = 85% used. The lasing gas this unit is

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Helium

Neon

Both

None of these

The life time of metastable state is equal to

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Life time of excited state

Greater than by excited state

Zero

Less than by excited state

The shell closer to the nucleus is called:

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N shell

L shell

K shell

M shell

O shell

Photons must have energy equal to

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ev

En

hf

None of these

The process of formation of spectrum is called:

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Interference

Spectroscopy

Dispersion

Reflection

Botha (A) and (D)

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluid

None of these

CT scanning is the abbreviated name of

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Computed Technology

Computed Technique

Computed Technology

Computerized Technique

The photocopying process is called:

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Geography

Sonography

Xerography

Zerography

None of these

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