Physics MCQs

Page No. 12

Which one of following postulate is in accordance with the Rutherfords model ?


a continuous spectra for atoms

✓


bdiscrete spectra for atoms

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ceither continuous nor discrete

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dno spectrum

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When we excite some atoms by heat collision or electrical discharge they will________________?


aradiate electromagnetic energy with a continuous distribution of wavelength

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babsorb particular wavelengths when white light is incident on them

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c radiate electromagnetic energy of discrete characteristic wavelength

✓


demit either invisible or visible light

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In obtaining an X-ray photograph of our hand we use the principle of______________?


a photo electric effect

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b ionization

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cshadow photograph

✓


dany of above

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View Answer shadow photograph

Photon of highest frequency will be absorbed when transition takes place from_____________?


a1st to 5th orbit

✓


b 2nd to 5th orbit

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c3rd to 5th orbit

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d4th to 5th orbit

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View Answer 1st to 5th orbit

The radiations emitted form hydrogen filled discharge tube show____________?


aband spectrum

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bline spectrum

✓


ccontinuous spectrum

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d absorption spectrum

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View Answer line spectrum

Total number of series in hydrogen spectrum is_____________?


athree

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bfour

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cfive

✓


d six

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View Answer five

X-ray are________________?


aof unknown nature

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bhigh energy electrons

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c high energy photons

✓


dradio isotopes

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Hydrogen atom does not emit X-rays because _________________?


aits energy levels are too close to each other

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bits energy levels are too far apart

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cit is too small in size

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dit has a single electron

✓



Excited atoms return to their ground state in_______________?


a10-10s

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b10-8s

✓


c10-6s

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d10-9s

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View Answer 10-8s

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


a Balmer series

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bPfund series

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c Bracket series

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dLymann series

✓


View Answer Lymann series

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