Class 12 Physics · Chapter 9 · Test 2
Redshift, Big Bang, Climate
49 MCQs
48 questions · 40 min · 48 marks
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Sample questions
The first 5 of 48. Try each one, then tap to see the answer.
Question 1
Dark lines in the spectrum of a star are produced when:
- AAtoms in its cooler outer atmosphere absorb specific wavelengths
- BThe star emits only red light
- CThe star is not hot
- DThe Earth's atmosphere removes light
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Answer: A
Atoms in the gaseous outer layers absorb specific wavelengths corresponding to electronic transitions.
Question 2
The spectrum showing dark lines in a continuous spectrum is called an:
- AEmission spectrum
- BAbsorption spectrum
- CBand spectrum
- DRainbow
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Answer: B
Missing wavelengths appear as dark lines in an absorption spectrum.
Question 3
Redshift means that the spectral lines of a distant object appear at:
- AShorter wavelengths than their known values
- BThe same wavelength
- CLonger wavelengths than their known values
- DNo wavelength
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Answer: C
Redshift is an increase in wavelength from the known laboratory value.
Question 4
A redshift in the light of a galaxy indicates that the galaxy is:
- AMoving towards Earth
- BMoving away from Earth
- CAt rest
- DCooling down
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Answer: B
A positive wavelength change shows the object is moving away.
Question 5
A blueshift indicates that a source is:
- AApproaching the Earth
- BReceding from Earth
- CStationary
- DCooling
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Answer: A
A negative change in wavelength shows the object approaches the Earth.
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