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


ceither continuous nor discrete


dno spectrum



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


aradiate electromagnetic energy with a continuous distribution of wavelength


babsorb particular wavelengths when white light is incident on them


c radiate electromagnetic energy of discrete characteristic wavelength


demit either invisible or visible light



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


a photo electric effect


b ionization


cshadow photograph


dany of above


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


c3rd to 5th orbit


d4th to 5th orbit


View Answer 1st to 5th orbit

The radiations emitted form hydrogen filled discharge tube show____________?


aband spectrum


bline spectrum


ccontinuous spectrum


d absorption spectrum


View Answer line spectrum

Total number of series in hydrogen spectrum is_____________?


athree


bfour


cfive


d six


View Answer five

X-ray are________________?


aof unknown nature


bhigh energy electrons


c high energy photons


dradio isotopes



Hydrogen atom does not emit X-rays because _________________?


aits energy levels are too close to each other


bits energy levels are too far apart


cit is too small in size


dit has a single electron



Excited atoms return to their ground state in_______________?


a10-10s


b10-8s


c10-6s


d10-9s


View Answer 10-8s

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


a Balmer series


bPfund series


c Bracket series


dLymann series


View Answer Lymann series

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