Atomic Spectra Mcqs

Our collections of Multiple choice questions and answers focuses on study of Atomic Spectra in Physics. These questions are chosen from a collection of most authoritative and best reference books on Physics. Our aim is to prepare an individual for competitive exams like NTS, GAT, ECAT, MDCAT, Teaching jobs Tests and Chemical industry job interviews. One should practice our Mcqs to assimilate knowledge on Atomic Spectra in Physics comprehensively.

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1.
Bracket series is obtained when all transition of electron terminate on

4th orbit

5th orbit

3rd orbit

2nd orbit

2.
Electron cannot exist in the nucleus it is confirmed by observing that

It does emit ?-radiation.

Its size as compare to proton and neutron is very small.

No antiparticle of electron is present.

The velocity of electron must be very high according to uncertainty principle.

5.
Hydrogen atom does not emit X-rays because

Its energy levels are too close to each other

Its energy levels are too far apart

It is too small in size

It has a single electron

6.
In an electronic transition atom cannot emit

?-rays

Infra red radiation

Visible light

Ultraviolet rays

7.
In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is

He/ev

He/Vc

EV/h

Impossible to predict

9.
In hydrogen spectrum which one of the following series lies in the ultraviolet region?

Balmer series

Pfund series

Bracket series

Lymann series

10.
In laser production the state in which more atoms are in the upper state than in the lower one is called

Metal stable state.

Normal state.

Inverted population.

All the above.

11.
In normal state of energy the incident high energy photons will be

Stimulated.

Absorbed.

Cause X-ray emission.

Cause laser production.

12.
In obtaining an X-ray photograph of our hand we use the principle of

Photo electric effect

Ionization

Shadow photograph

Any of above

13.
Maximum frequency in the spectrum from X-ray tube is directly proportional to the

Number of incident electron i.e. filament current.

The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated.

The soft target which can easily emit electrons.

All of above are correct.

14.
Photon of highest frequency will be absorbed when transition takes place from

1st to 5th orbit

2nd to 5th orbit

3rd to 5th orbit

4th to 5th orbit

15.
Quality of X-rays depends upon ___________ A-filament current B-accelerating voltage C-material of the target

A&B

B&C

A&C

A B & C

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