Comprehensive Stellar Physics Quiz | Test Your Knowledge Today!

1. Stellar Physics 1 Multiple Choice Questions

2. Test Question Does this quiz work? A. Yes B. No

3. Stellar Physics 1 • 1. Which of the following stars are directly resolvable from earth with present technology (including orbiting telescopes)? • The Sun only. • The Sun, Betelgeuse and Polaris. • The Sun, Betelgeuse and Alpha Centauri. • The Sun and Betelgeuse only. y

4. Stellar Physics 1 • 2. Fill in the blank: L = 4πD2 x __ . • 1/F. • F2. • 1/F2. • F. y

5. Stellar Physics 1 • 3. What is the approximate range of luminosities of stars other than the sun? • 10-4 Lsun < L < 106 Lsun. Y • 10-3 Lsun < L < 105 Lsun. • 10-2 Lsun < L < 106 Lsun. • 10-6 Lsun < L < 104 Lsun.

6. Stellar Physics 1 • 4. What are the units of the constant 0.0029 in Wien’s displacement law? • Milli-Kelvin. • W m-2. • metres / Kelvin. • metres Kelvin. y

7. Stellar Physics 1 • 5. To what power must the temperature be raised in the Stefan-Boltzmann law? • 4.y • 3. • 2. • 1.

8. Stellar Physics 1 • 6. What is the constant ‘σ’ in the relation L= 4πR2σT4? • Stefan-Boltzmann constant. Y • Boltzmann constant. • Wien constant. • Planck constant.

9. Stellar Physics 1 • 7. Where do the white dwarfs lie on the Hertzprung-Russell diagram? • Bottom right. • Bottom left. Y • Top right. • Top left.

10. Stellar Physics 1 • 8. Pogson’s can be used to relate… • Two absolute magnitudes with two fluxes. • Two apparent magnitudes with two luminosities. • Two fluxes with two apparent magnitudes. y • All of the above.

11. Stellar Physics 1 • 9. Red giants are… • Cool and dim. • Cool and luminous. y • Hot and dim. • Hot and luminous.

12. Stellar Physics 1 • 10. Which statement is correct? • White dwarfs can turn into main sequence stars. • White dwarfs can turn into red giants. • Red Giants can turn into main sequence stars. • Red giants can turn into white dwarfs. y

13. Stellar Physics 1 • 11. Cepheids are useful as distance indicators because of what relationship they have? • Distance – luminosity relationship. • Temperature – luminosity relationship. • Temperature – distance relationship. • Luminosity – period relationship. y

14. Stellar Physics 1 • 12. Which of the following is a correct form of Kepler’s third law? • T2/R3 = G(m1 + m2) / 4π2. • R3/T2 = G(m1 + m2) / 4π2. y • T2/R3 = G(m1m2) / 4π2. • R2/T3 = G(m1 + m2) / 4π2.

15. Stellar Physics 1 • 13. Define the change in wavelength Δλ with relation to line-of-sight velocity v due to the Doppler Effect: • Δλ = vc / λ0. • Δλ / c = v / λ0. • Δλ / λ0 = v / c. y • Δλ / λ0 = c / v.

16. Stellar Physics 1 • 14. Which of the following statements is true about eclipsing binary systems? • A secondary maximum occurs when a smaller star eclipses a larger star. • A primary minimum occurs when a smaller star eclipses a larger one. • A secondary minimum occurs when a smaller star eclipses a larger one. • A primary minimum occurs when a larger star eclipses a smaller one. y

17. Stellar Physics 1 • 15. Which of the following is the correct sequence of the Harvard classification scheme? • O, B, F, A, G, K, M. • O, B, A, G, K, F, M. • O, F, A, G, K, B, M. • O, B, A, F, G, K, M. Y

18. Stellar Physics 1 • 16. Which of the following is the incorrect statement about the Harvard classification scheme? • O type stars are hotter than A type stars. • The Sun is a G type star. • M type stars are cool and luminous. • K type stars are hotter than G type stars. y

19. Stellar Physics 1 • 17. Which of the following statements is incorrect about a mass luminosity relationship? • There is a mass luminosity relationship in all stars. y • There is a mass luminosity relationship but only in main sequence stars. • There is a mass luminosity relationship but only in red giants. • There is a mass luminosity relationship but only in white dwarfs.

20. Stellar Physics 1 • 18. Which of the following statements is incorrect? • A hot dense gas produces a continuous spectrum with no spectral lines. • A hot diffuse gas produces bright spectral lines – an emission spectrum. • A cool dense gas produces a continuous spectrum with no spectral lines. y • A cool diffuse gas in front of a source of continuous spectrum produces dark spectral lines – an absorption spectrum.

21. Stellar Physics 1 • 19. In the Bohr model, only photons with energies corresponding to differences between energy levels can be emitted or absorbed, true or false? • True. Y • False.

22. Stellar Physics 1 • 20. In the Rydberg Equation, what is the expression R∞(1/m2 – 1/n2) equal to? • λ. • 1/ λ. Y • E. • 1/E.

23. Stellar Physics 1 • 21. What is a Hayashi track? • The track that a star takes as it moves up the main sequence. • The track that a star takes as it moves down the main sequence. • The track that a star takes as it moves off the main sequence. y • The track that a star takes as it moves onto the main sequence.

24. Stellar Physics 1 • 22. How is the sun predominantly powered? • Through p-p chain Hydrogen-Helium Fission. • Through the CNO cycle Hydrogen-Helium Fusion. • Through the CNO cycle Hydrogen-Helium Fission. • Through p-p chain Hydrogen-Helium Fusion. y

25. Stellar Physics 1 • 23. In the equation of hydrostatic equilibrium, how is the expression dP/dr proportional to the radius ‘r’? • Directly proportional to r. • Inversely proportional to r. • Directly proportional to r2. • Inversely proportional to r2. y

26. Stellar Physics 1 • 24. What is the mass luminosity relationship for main sequence stars? • L directly proportional to M3.5. y • L inversely proportional to M3.5. • M directly proportional to L3.5. • M inversely proportional to L3.5.

27. Stellar Physics 1 • 25. Elements can only fuse in the core if there is a net drop in potential energy of the protons during the reaction, after a certain point, corresponding to a particular element, fusion stops producing energy and starts absorbing it instead. What is this element? • Iron. y • Helium. • Hydrogen. • Titanium.