Question # 1

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

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)

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

Ultraviolet region lies in ______ series

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Layman

Balmer

P fund

B racket

The range of wavelengths of colurs in the visible colours is

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140 nm to 456 nm

10 nm to 56 nm

410 nm to 656 nm

910 nm to 956 nm

None of these

Selenium is:

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An insulator

A conductor

Both A and B

Excellent conductor

None of these

Static electricity is produced by the transfer of:

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Electrons

Protons

One fluid

Two fluid

None of these

In flesh, light element like carbon, hydrogen and oxygen predominate. Three elements allows ______ amount of incident X-ray to pass through them

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Small

Greater

Equal

Sometimes

Photons must have energy equal to

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ev

En

hf

None of these

Tick the series which lie/s in. the infra-red region.

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Pfund series

Brackett series

Paschen series

All of these

None of these

In case of braking radiations, when the rate of deceleration is very large, the emitted radiation corresponds to:

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Short wavelength

Large wavelength

Very large wavelenth

Low frequency

Both (B) and (C)

The results of spectra obtained by Blamer were expressed in 1896 by

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Bohr

Rydberg

Planck

Rutherford

Coulomb

Laser is a beam of:

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Visible light

Infra red light

Ultra violet light

Violet light only

yellow light only

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

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Bohr

Rydberg

Planck

Rutherford

Coulomb

The value of the metastable state for Neon is

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20.66eV

20.61eV

19.23eV

18.70eV

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