Question

1. What is the reason for two stars to have the same brightness but one being 100 times more luminous than the other?

   • One of them is 100 times more distant
   • One of them is 10 times more distant
   • One of them is 1000 times more distant
   • One of them is 4π times more distant

2. The Brightness scale like the inverse of the square of the distance (1/R²)

   • T
   • F

3. What is parallax?

   • The distance of a star
   • A method to measure the brightness of a star
   • A method to measure the distance of a star
   • method to measure the orbit of a star

4. How do we measure the temperature of a star

   • With its luminosity
   • With its spectrum
   • With it brightness
   • With its radius

5. What is the peculiarity of stars on the main sequence?

   • They are dying stars
   • They are dwarf stars
   • They are stars where an equilibrium between gravity and nuclear fusion pressure is in place
   • They are stars where an equilibrium between gravity and heat pressure is in place

6. Which of the following statements is true for stars on the main sequence

   • Less massive stars on the main sequence are bluer
   • More massive stars live longer
   • More massive stars are less luminous
   • None of the above

7. What happens when Stars like the Sun exhaust their Hydrogen fuel?

   • They turn into a Helium burning red giant and eventually in a planetary nebula with a white dwarf at its center
   • They turn into a Helium burning red giant and eventually in a planetary nebula with a neutron star at its center
   • They collapse into a black hole
   • None of the above

8. What happens when massive stars like Betelgeuse exhaust their Hydrogen fuel?

   • They burn heavier elements up to Iron and eventually explode like Supernovae
   • They produce elements heavier than iron during the explosion
   • They evolve into Black holes or Neutron stars depending on their actual mass
   • All of the above

Answer 1

as 0 What is the reason for two stars to have the Same brightness but one being 100 times more luminous than the other ? ans The answer oo the question is option (6) -> One of them is 10 times more distant. duminosity aty (distance) 2 100 x L (distance) 2 (100)% a istance distance - 10km far 2 The brightness scale like the inverse of the square of the distance (1/2) ans This statement is true. Because with the increase in distance luminosity decreases as square of the distance. 6 what is Pare allax? ans A method to measure the distance of a star -

© How do we meauere the brightness temperature of a star? ans The correct answer to the question is option B with its Spectruens. Red Hotell Cooler Blue antelle Hottest ② what is the peculiarity of stores on the main sequence ? ans. They are stars wheree an equilli beien between gravity and nuclear fussion pressure is in place. As after a estave uses up all the hydrogen in its core, it leaves the main sequence and moves towards red giant branch © which of the following statements is true for stores on the main sequence ? ans More massive staves are less leminous. to they caile exhaust foster clece to their high mass. More massive stores on the main sequence are bleur and hother. More massive estars live less as they will exchaust faster than less massive stars-

Go what happens when stars like the sun exhaust ' dheir Hydrogen frees? ans. They collapse into a black hole. Super - Black nova hole stars like - Super sun gecent ( Life Cycle) @ what happens when massive stores like Betelgeuse''eschaust their Hydrogen fuel? ans They evolve into Black holes of Neutron staves. It is seemed ley squeezing of light elemends cendre enough pressure to go for fusion. Then stare was formed in a cloud of dust particles & energy. They became a prolas fare le fesion. Then twened into a massive estar 8 entered the main esequence bear and over millions of years it went all the stages & tvered into a red giant which is its present stage Huge stars (15< sun's <3) Red super geant . super mass Supernova Neutron stars.