Question # 1

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

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)

The spectrum emitted from hydrogen filled discharge tube is:

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Line spectrum

Discrete spectrum

And spectrum

Absorption spectrum

Both (A) and (B)

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

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Bohr

Rydberg

Planck

Rutherford

Coulomb

The electric field lines start from:

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Positive charge

Negative charge

Either A and B

Neutron

An atom

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

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VIBGYOR

ROYBGIV

ROYBIGV

BIGROYV

None of these

The results of spectra obtained by Blamer 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 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 first shell near the neucles is

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L-shell

X-shell

N-shell

M-shell

Ultraviolet region lies in ______ series

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Layman

Balmer

P fund

B racket

If the distance between two charges is doubled,the force between them will become:

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Double

Half

One third

One fourth

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

Tick the series which lies in the visible region:

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Lyman series

Balmer series

Paschen series

Brackett series

P fund series

Energy required by an electron revolving in certain orbit to jump to an excited state is called:

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Ionization energy

Ionization potential

Excitation energy

Excitation potential

None of these

The shell closer to the nucleus is called:

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N shell

L shell

K shell

M shell

O shell

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ECAT Physics Chapter 20 Atomic Spectra Online Test MCQs With Answers

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