Class 12 Physics · Chapter 6 · Test 3
Atomic Spectra and Uncertainty
49 MCQs
49 questions · 40 min · 49 marks
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Sample questions
The first 5 of 49. Try each one, then tap to see the answer.
Question 1
The experimental arrangement to observe atomic spectra consists of a discharge tube and a:
- ASpectrometer with a diffraction grating
- BMicroscope
- CTelescope only
- DCalorimeter
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Answer: A
Atomic spectra are observed with a discharge tube a spectrometer and a diffraction grating.
Question 2
Vapours of an element viewed through a spectrometer show a series of lines on a:
- AWhite background
- BDark background
- CColoured background only
- DContinuous spectrum
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Answer: B
The lines are viewed in a dark background through the eyepiece.
Question 3
The spectrum in which colours are separated by dark spaces is called a:
- AContinuous spectrum
- BBand spectrum
- CLine spectrum
- DRainbow spectrum
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Answer: C
A line spectrum has different colours that are not diffused into each other.
Question 4
Spectral lines can be used to:
- AIdentify different elements
- BMeasure mass
- CMeasure charge
- DMeasure time
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Answer: A
Different elements exhibit different patterns of lines.
Question 5
The spectral series in the visible region of hydrogen was identified in 1885 by:
- ARydberg
- BJ. J. Balmer
- CLyman
- DPaschen
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Answer: B
J. J. Balmer identified this series in 1885.
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